Top 30 Private Client Tax Advisory Boutiques 2026

This report forms part of the Wealth Ranking Private Wealth series, which evaluates independent advisory institutions, investment offices, specialist wealth managers, private banks, fiduciary organizations, and professional firms serving high-net-worth and ultra-high-net-worth clients across major global wealth markets.

Private client tax advisers operate where personal wealth, family ownership, mobility, succession, and regulatory reporting meet. Their work may encompass income and capital-gains taxation, estate and gift planning, trusts and foundations, residence and domicile, family-business succession, philanthropy, executive and carried-interest arrangements, tax controversy, and the coordination of assets held across several jurisdictions.

The term boutique is used functionally rather than as a strict measure of headcount. A qualifying organization may be an independent tax firm, a private-client law firm, a specialist accountancy partnership, or a clearly identifiable private-client practice within a broader professional-services organization. What matters is that private-client tax advice is a substantial, visible, and technically credible part of the proposition.

Tax planning must also be distinguished from the marketing of products, structures, or jurisdictions. A leading adviser does not merely identify a lower-tax outcome. It tests residence, beneficial ownership, control, source of funds, reporting, anti-avoidance rules, treaty access, succession law, family objectives, implementation, and the possibility that several tax systems may assert jurisdiction at the same time.

The Wealth Ranking Top Private Client Tax Advisory Boutiques 2026 ranking recognizes firms whose technical depth, private-client focus, cross-border judgment, professional standing, and continuing institutional relevance distinguish them within international private wealth. It does not assess the suitability of any tax structure, residence, trust, foundation, transaction, or succession plan for a particular client.

Market Overview

Private-client taxation has moved beyond the traditional separation between annual compliance and occasional estate planning. Entrepreneurs may hold operating companies, carried interests, private funds, intellectual property, real estate, digital assets, and family investment vehicles across multiple countries. A change in residence, liquidity event, marriage, divorce, death, or generational transfer can affect several parts of that structure simultaneously.

London remains an influential center because of its concentration of internationally mobile families, trustees, family offices, private banks, lawyers, and accountants. The replacement of the United Kingdom’s former remittance-basis framework has, however, made residence history, foreign income and gains, trust protections, inheritance-tax exposure, and transitional treatment central to current advice.

The United States is equally important but structurally different. Citizenship-based taxation, federal and state residence questions, estate and gift tax, expatriation rules, entity classification, and extensive information reporting create long-duration obligations. The higher federal estate and gift tax exclusion in 2026 changes planning thresholds, but it does not eliminate the need to consider state taxes, non-citizen spouses, foreign assets, basis, liquidity, governance, and multigenerational objectives.

Continental European advice is shaped by civil-law succession, forced-heirship rules, wealth and inheritance taxes, exit taxes, foundation regimes, family-company ownership, and the interaction of domestic law with European freedoms and reporting obligations. Germany, France, Italy, Belgium, Switzerland, and Luxembourg consequently support highly technical private-client practices with different legal and professional traditions.

Singapore, Australia, Canada, and the Gulf have also become more important. Singapore combines family-office development with Asian cross-border ownership and succession. Australia and Canada require sophisticated advice for trusts, privately owned businesses, migration, and international families. The UAE’s growth as a residence and family-office center has increased demand for advice that coordinates local foundations, corporate tax, foreign tax residence, home-country exposure, Sharia and non-Sharia succession, and international reporting.

Operating models differ. Independent tax boutiques offer concentrated expertise and senior access. Private-client law firms integrate tax with trusts, estates, disputes, immigration, and family governance. Accountancy firms can combine planning with returns, financial statements, valuation, and business advice. Larger networks add jurisdictional reach but must demonstrate that the named local practice—not merely a global brand—possesses genuine private-client capability.

Conflicts and implementation quality matter. Advisers may be asked to recommend trustees, investment managers, insurers, migration specialists, valuers, or corporate-service providers. Leading firms explain referral relationships, preserve professional independence, document assumptions, and remain involved after implementation so that legal ownership, tax filings, accounts, distributions, and family conduct remain aligned with the intended plan.

Industry Trend — 2026

The central private-client tax issue in 2026 is the convergence of mobility and transparency. Families can relocate, invest, and organize ownership internationally, but tax authorities receive more information about accounts, entities, controlling persons, and transactions. Planning therefore depends less on opacity and more on defensible residence, commercial substance, accurate classification, coherent documentation, and timely reporting.

Crypto-asset reporting is moving into the mainstream compliance perimeter. The European Union’s DAC8 regime applies from 2026, while many jurisdictions are preparing for the first exchanges under the OECD Crypto-Asset Reporting Framework in 2027 or 2028. Advisers must map exchanges, custodians, wallets, entities, controlling persons, cost basis, residence, source of wealth, and succession access rather than treating digital assets as an isolated portfolio issue.

The United Kingdom’s residence-based foreign income and gains regime continues to generate substantial restructuring and compliance work. Since April 2025, UK residents generally face taxation on worldwide income and gains, subject to the four-year regime for qualifying new residents and transitional rules. Families must revisit historic structures, trust distributions, remittances, inheritance-tax exposure, and the evidence supporting periods of non-residence.

In the United States, the 2026 federal basic estate and gift tax exclusion of $15 million has reduced the feared immediate contraction in the exemption. The change has not ended planning demand. Advisers are focusing on portability, basis management, state estate taxes, valuation, insurance, governance, non-citizen family members, expatriation, and structures whose economic purpose should survive future political change.

Business succession is becoming more urgent as founders age and private-company wealth passes to the next generation. Tax advice must connect ownership, voting control, liquidity, management succession, family governance, valuation, marital claims, charitable objectives, and the differing capacities of heirs. A tax-efficient transfer that leaves the business ungovernable is not a successful succession plan.

Tax authorities are also paying closer attention to anti-avoidance, beneficial ownership, treaty entitlement, management and control, permanent establishment, and the economic reality of family entities. Advisers increasingly need contemporaneous evidence of decision-making, investment purpose, services, distributions, loans, valuations, and the responsibilities of directors, trustees, protectors, and family-office personnel.

Artificial intelligence can assist research, document comparison, return preparation, and the identification of inconsistencies across large entity structures. Private-client information is exceptionally sensitive, however. Firms need approved systems, restricted data use, human review, source verification, professional accountability, and clear rules preventing confidential family information from entering uncontrolled models.

The strongest private-client tax advisers in 2026 combine technical law with operational realism. They recognize that a structure must be administrable, bankable, reportable, understandable to the family, and resilient to changes in residence, relationships, ownership, regulation, and tax law.

2026 private-client tax consideration	Why it matters	Capability expected of leading advisers
Tax residence and mobility	Day counts alone may not resolve residence, domicile, treaty tie-breakers, management, or departure and arrival exposure	Multi-year residence mapping, treaty analysis, documentary evidence, pre-arrival planning, and coordinated filings
UK foreign income and gains regime	The post-remittance-basis system changes the treatment of foreign income, gains, trusts, remittances, and inheritance-tax exposure	Residence-history review, four-year-regime analysis, transitional planning, trust assessment, and implementation controls
Estate, gift, and inheritance tax	Exemptions, rates, forced-heirship rules, situs, citizenship, and state or local taxes vary substantially	Integrated lifetime and testamentary planning, valuation, liquidity analysis, treaty review, and periodic recalibration
Family-business succession	Tax-efficient transfers can still fail if control, management, liquidity, and family expectations are unresolved	Ownership design, valuation, governance, shareholder arrangements, next-generation preparation, and transaction execution
Trusts, foundations, and holding entities	Residence, control, attribution, distributions, reporting, and beneficial ownership may be assessed differently across jurisdictions	Entity-by-entity classification, governing-document review, control mapping, distribution policy, and coordinated compliance
Crypto assets and DAC8/CARF	Wallets, exchanges, custodians, entities, and transfers create tax, reporting, valuation, and succession questions	Transaction reconstruction, cost-basis controls, ownership mapping, reporting readiness, custody review, and succession access
Liquidity events and private capital	Business sales, carried interest, fund interests, and concentrated holdings can trigger tax across several systems	Pre-transaction planning, residence and source analysis, valuation, reinvestment review, and post-sale governance
Philanthropy	Cross-border gifts may fail to receive expected relief or create governance and reporting obligations	Vehicle selection, deductibility analysis, foundation governance, expenditure controls, and cross-border coordination
Anti-avoidance and substance	Authorities increasingly test purpose, control, treaty access, loans, valuations, and economic behavior	Technical opinions, contemporaneous evidence, commercial-purpose analysis, defensible valuations, and audit-ready records
Information reporting	CRS, FATCA, beneficial-ownership regimes, trust registers, and domestic disclosures can overlap	Classification matrices, responsible-party assignment, data reconciliation, deadline controls, and correction procedures
Tax controversy	Cross-border structures can face simultaneous enquiries, information requests, penalties, or competing residence claims	Privilege-aware review, evidence preservation, authority engagement, settlement strategy, and multi-jurisdictional coordination
AI and confidential data	Automation can increase efficiency while creating accuracy, privilege, privacy, and cybersecurity risks	Approved tools, protected environments, source checking, human sign-off, audit trails, and clear accountability

The relevant distinction is therefore not simply between large and small firms, or between lawyers and accountants. It is between practices capable of connecting technical tax analysis with implementation, compliance, succession, and family reality, and practices that treat private-client planning as a collection of isolated transactions.

Methodology — Core Eligibility Criteria

To ensure structural consistency within the category, organizations considered for this ranking were evaluated according to the following eligibility conditions:

• Provides identifiable tax planning, tax compliance, estate and gift tax, inheritance tax, trust taxation, residence, international tax, succession, or closely related private-client services
• Serves high-net-worth or ultra-high-net-worth individuals, internationally active families, entrepreneurs, founders, family offices, trustees, estates, or family-owned businesses
• Treats private-client tax advice as a substantial and visible practice rather than an occasional adjunct to corporate work
• Demonstrates current operations, a traceable professional team, and a credible service proposition during the 2026 evaluation period
• Possesses meaningful experience with cross-border assets, mobility, trusts, foundations, family companies, private investments, philanthropy, or multigenerational wealth transfer
• Can coordinate legal, accounting, fiduciary, valuation, investment, immigration, and family-governance considerations without obscuring professional roles
• Maintains professional, ethical, confidentiality, cybersecurity, conflict-management, and quality-control processes appropriate to sensitive private-client work
• Demonstrates sufficient technical depth and institutional continuity to advise on long-duration structures and obligations
• Communicates ownership, network membership, and group relationships clearly enough to assess responsibility and avoid double-counting
• Operates within the relevant licensing and professional-regulation framework for the services offered

Independent tax boutiques, private-client law firms, specialist accountancy firms, and local practices within international networks were eligible. Universal banks, wealth managers without a substantial tax-advisory practice, product-led structure promoters, migration firms without deep tax capability, formation agents focused on standardized entities, and inactive or fully absorbed legacy brands were excluded.

The word boutique does not imply that every ranked firm is small or independently owned. Larger firms and network members were included only where the private-client practice was sufficiently specialist, identifiable, and important to the organization. Inclusion of a network member refers to the named operating firm, not automatically to every member using the same international brand.

The ranking does not treat a claimed reduction in tax as evidence of quality. It emphasizes technical defensibility, lawful implementation, accurate reporting, governance, professional judgment, and the ability to explain risks and alternatives. Clients should obtain advice tailored to every relevant jurisdiction and independently evaluate engagement terms, conflicts, professional regulation, privilege, fees, cybersecurity, and implementation responsibilities.

Methodology — Ranking Factors

Firms included in the ranking were evaluated using a combination of qualitative and structural considerations. Key factors include:

• Institutional reputation and sustained relevance in private-client taxation and wealth planning
• Technical depth in personal, international, estate, gift, inheritance, trust, foundation, residence, and succession taxation
• Quality of cross-border analysis and ability to coordinate several tax and legal systems
• Experience with entrepreneurs, family-owned businesses, family offices, trustees, private capital, complex assets, and multigenerational families
• Strength in implementation, compliance, reporting, recordkeeping, and ongoing review
• Ability to integrate tax advice with trusts and estates, corporate law, family governance, philanthropy, immigration, valuation, and dispute resolution
• Senior-client access, continuity of advisers, multidisciplinary collaboration, and professional succession
• Independence of judgment, transparency regarding referrals and ownership, and management of conflicts
• Tax-controversy capability and ability to defend positions with evidence, analysis, and disciplined documentation
• Geographic reach, cultural fluency, and familiarity with major international wealth centers
• Technology, data protection, cybersecurity, privacy, and controls governing AI-assisted work
• Current organizational development, including combinations, network relationships, rebrands, and investment in the private-client practice
• Thought leadership, professional contribution, and relevance to the evolving international tax framework
• Overall institutional resilience and ability to support long-term family relationships

Revenue, headcount, office network, and corporate age were treated as contextual evidence rather than mechanical ranking variables. A smaller specialist could rank strongly where its technical focus, private-client reputation, and cross-border judgment were exceptional.

The ranking universe consisted of approximately 110 private-client tax practices, specialist tax firms, accountancy partnerships, and private-wealth law firms, from which 30 organizations were selected.

Tier classifications reflect relative institutional positioning and do not represent legal or tax opinions, assessments of client outcomes, guarantees of regulatory acceptance, or endorsements of any firm, structure, jurisdiction, or planning strategy.

---

Tier I — Leading Private Client Tax Advisory Firms

Saffery LLP

• Headquarters: London, United Kingdom
• Founded: 1855

Saffery LLP is a UK accountancy and advisory partnership with a deep private-client heritage. It advises high-net-worth individuals, entrepreneurs, family offices, trusts, estates, landed interests, and privately owned businesses on personal tax, international matters, inheritance tax, succession, philanthropy, and compliance.

The practice is particularly relevant where family wealth spans an operating company, investment structures, trusts, property, and several generations. Tax, accounting, valuation, business, and fiduciary considerations can be coordinated within a relationship-led professional-services model.

Saffery occupies Tier I because private clients are central to its institutional identity rather than a peripheral segment. Its longevity, technical standing, adviser continuity, and ability to serve complex families make it one of the clearest benchmarks for this category.

Rawlinson & Hunter

• Headquarters: London, United Kingdom
• Founded: 1933

Rawlinson & Hunter is an international grouping of professional firms providing tax, accounting, trust, fiduciary, and private-client services. Its clients include wealthy individuals, family offices, trustees, estates, private companies, and internationally structured families.

The group is especially relevant where UK tax advice must be coordinated with offshore entities, trusts, investment holdings, estate planning, and reporting in other financial centers. Its network structure requires clients to understand which member firm is responsible for each engagement, but it also creates useful jurisdictional connectivity.

Rawlinson & Hunter occupies Tier I because its private-client, tax, and fiduciary heritage is unusually concentrated and longstanding. Its cross-border experience and familiarity with complex ownership structures give it a defining position in international private-client advice.

Withers

• Headquarters: London, United Kingdom
• Founded: 1896

Withers is an international law firm whose identity is closely associated with private individuals, families, founders, family offices, charities, and private capital. Its work covers personal and international tax, trusts, estates, succession, philanthropy, family governance, immigration, disputes, and the structuring of business and investment wealth.

The firm is particularly strong where several legal systems and personal circumstances interact. Residence, citizenship, family law, trust law, business ownership, reputational concerns, and tax exposure can be addressed through teams across major wealth centers.

Withers occupies Tier I because it is among the most globally recognized private-client law firms. Its international reach, breadth of private-wealth expertise, and ability to connect tax planning with legal implementation distinguish it from firms whose private-client capability is narrower or primarily domestic.

Farrer & Co

• Headquarters: London, United Kingdom
• Founded: 1701 legacy

Farrer & Co is an independent London law firm with a longstanding practice serving families, individuals, family offices, trustees, estates, charities, and privately owned institutions. Its private-client work includes personal tax, trusts, succession, estate administration, governance, philanthropy, and sensitive family matters.

The firm’s value lies in the integration of technical advice with stewardship and long-term relationships. It is well suited to families whose assets include businesses, property, heritage interests, investments, charitable structures, and multigenerational ownership.

Farrer & Co occupies Tier I because private wealth is embedded in its institutional character. Its independence, historical standing, discretion, and ability to combine tax with wider family and governance advice support its place among the category’s leading firms.

Blick Rothenberg

• Headquarters: London, United Kingdom
• Founded: 1945

Blick Rothenberg is a London-based tax, accounting, and business advisory firm with a substantial private-client practice. It advises entrepreneurs, internationally mobile individuals, executives, families, and business owners on personal tax, residence, international matters, inheritance tax, estate planning, and compliance.

The firm is especially relevant where personal tax is connected to business ownership, employment, investment, or relocation. Its position within the wider Azets group gives it access to broader resources, while the Blick Rothenberg brand continues to maintain a distinct London tax and private-client identity.

Blick Rothenberg occupies Tier I because of the visibility, technical depth, and active market presence of its private-client tax platform. Its ownership means it is not an independent partnership in the traditional sense, but its specialist proposition remains sufficiently clear for leading-tier inclusion.

---

Tier II — Established Private Client Tax Advisory Firms

(Alphabetical order)

Andersen

• Headquarters: San Francisco, United States
• Founded: 2002 platform; Andersen name adopted later

Andersen is a tax and advisory organization with a substantial private-client practice serving individuals, families, executives, entrepreneurs, and family offices. Its services include income-tax planning and compliance, estate and gift planning, family-office support, valuation, and international coordination.

The platform is particularly relevant to U.S. citizens, residents, and internationally connected families whose personal affairs intersect with companies, investments, trusts, partnerships, and cross-border reporting. Its international member and collaborating-firm structure extends access beyond the United States.

Andersen occupies Tier II because its private-client capabilities are broad and technically credible, while its overall organization extends well beyond private wealth. Its tax-focused identity and international development nevertheless make it a strong established provider.

Boodle Hatfield

• Headquarters: London, United Kingdom
• Founded: 1722

Boodle Hatfield is a private-capital law firm advising individuals, families, trustees, family offices, landed estates, and entrepreneurs. Its capabilities include personal tax, trusts, estate and succession planning, family businesses, property, philanthropy, art, and heritage assets.

The firm is especially relevant where tax planning is inseparable from ownership, family governance, real estate, or the long-term stewardship of distinctive assets. Its focused private-capital identity differentiates it from general commercial law firms with smaller private-client teams.

Boodle Hatfield occupies Tier II because of its category fit, senior private-client relationships, and longstanding London reputation. Its geographic footprint is narrower than the most international Tier I firms, but its technical and relationship depth remain substantial.

Buzzacott

• Headquarters: London, United Kingdom
• Founded: 1919

Buzzacott is an independent UK accountancy and advisory firm with a visible private-client practice. It serves individuals, families, entrepreneurs, trusts, charities, executives, and internationally connected clients through tax planning, compliance, estate, trust, and related financial services.

Its model combines the resources of a sizeable professional partnership with a more focused identity than a global audit network. This is relevant to clients who require recurring compliance and accounting support alongside advice on residence, inheritance tax, business interests, investment income, and charitable giving.

Buzzacott occupies Tier II because it offers a credible balance of independence, technical resources, and private-client focus. It is less globally defining than the leading tier, but its active practice and institutional continuity make it a strong established inclusion.

Charles Russell Speechlys

• Headquarters: London, United Kingdom
• Founded: 2014 current firm; 1891 legacy

Charles Russell Speechlys is an international law firm with a major private wealth and private capital practice. It advises individuals, families, family offices, trustees, entrepreneurs, and private businesses on tax, trusts, succession, governance, immigration, disputes, and cross-border structuring.

The firm is particularly relevant to clients whose personal and commercial wealth cannot be separated. Its teams can connect family-company ownership, transactions, relocation, estate planning, asset protection, and disputes across Europe, the Middle East, and Asia.

Charles Russell Speechlys occupies Tier II because its private-client practice is internationally significant, although the wider firm includes many commercial disciplines. Its private-capital orientation and geographic reach make it one of the strongest broader law-firm inclusions.

Flick Gocke Schaumburg

• Headquarters: Bonn, Germany
• Founded: 1972

Flick Gocke Schaumburg is an independent multidisciplinary firm combining tax, law, audit, valuation, and business advisory services. Its private-client and family-office work covers business succession, wealth planning, inheritance and gift tax, foundations, international tax, family investments, and the structuring of operating-company and private assets.

The firm is especially relevant to German entrepreneurial families whose wealth includes concentrated company holdings, real estate, funds, art, or international investments. Its ability to join legal, tax, valuation, and implementation expertise is valuable in complex succession and restructuring mandates.

Flick Gocke Schaumburg occupies Tier II because it is one of Germany’s leading independent tax-centered professional firms. Its overall platform is broader than a private-client boutique, but the depth of its family, succession, and wealth work makes it an important established inclusion.

Forsters

• Headquarters: London, United Kingdom
• Founded: 1998

Forsters is a London law firm known for private wealth and real estate. It advises wealthy individuals, families, trustees, family offices, entrepreneurs, and landed interests on tax, trusts, estates, succession, family governance, residence, and property-related wealth questions.

The practice is particularly relevant where personal wealth planning intersects with real estate, family companies, offshore structures, or international mobility. Its focused partnership model supports senior access and coordination between private-client and property specialists.

Forsters occupies Tier II because its private-wealth identity and category fit are strong. Its primarily London-centered platform is more concentrated than those of the leading international firms, but its technical reputation supports established-tier placement.

Kozusko Harris Duncan

• Headquarters: Washington, D.C., United States
• Founded: 2012 current combination; 2000 legacy

Kozusko Harris Duncan is a U.S. law firm focused on private clients, families, family offices, trustees, and closely held businesses. Its work encompasses tax, trusts and estates, cross-border planning, philanthropy, business ownership, governance, and private-client disputes.

The firm is particularly well aligned with families whose wealth remains active through enterprises, investment entities, foundations, and multigenerational structures. Its boutique model allows private-client concerns to remain central rather than subordinate to a large corporate practice.

Kozusko Harris Duncan occupies Tier II because its specialist identity and category alignment are exceptional. Its scale and geographic footprint are smaller than the global Tier I firms, but its focused U.S. private-client expertise is highly credible.

Maisto e Associati

• Headquarters: Milan, Italy
• Founded: 1991

Maisto e Associati is an independent Italian tax law firm serving companies, institutions, individuals, entrepreneurs, and families. Its private-client work includes residence, estate planning, trusts, foundations, business succession, investment ownership, and cross-border tax structuring.

The firm is especially relevant to internationally mobile families with Italian assets or residence exposure and to entrepreneurial families addressing ownership transitions. Its dedicated tax identity gives it greater technical concentration than broader Italian full-service firms.

Maisto e Associati occupies Tier II because of its strong tax reputation, independent platform, and meaningful private-client capability. It brings important Italian and continental-European depth to a field otherwise dominated by UK and U.S. practices.

POELLATH

• Headquarters: Munich, Germany
• Founded: 1993

POELLATH is an independent German law firm with a prominent private-client practice serving entrepreneurial families, wealthy individuals, foundations, and foreign trusts. Its work covers the legal and tax structuring of private and business assets, succession, inheritance and gift tax, family offices, foundations, trusts, residence, and family governance.

The practice benefits from the firm’s wider expertise in private equity, investment funds, real estate, and corporate law. This is relevant to founders and families whose wealth includes fund interests, carried interests, direct investments, operating companies, and cross-border transactions.

POELLATH occupies Tier II because its specialist private-client team combines tax depth with sophisticated private-capital knowledge. Its independent status, concentrated expertise, and standing in German succession and wealth planning make it a strong established inclusion.

Tirard Naudin

• Headquarters: Paris, France
• Founded: 1989

Tirard Naudin is a Paris boutique focused on international tax and estate planning for individuals, families, trustees, private banks, and wealth structures. Its work includes French and cross-border taxation, trusts, estates, residence, property, and multijurisdictional succession.

The firm is particularly relevant where clients have French residence, assets, beneficiaries, or investment exposure alongside connections to other countries. France’s technically demanding personal, estate, trust, and real-estate tax framework supports the need for dedicated private-client specialists.

Tirard Naudin occupies Tier II because it is a clean example of the category: a focused tax and estate-planning boutique with cross-border credibility. Its scale is smaller than the leading international firms, but its technical concentration is a strength.

---

Tier III — Specialist Private Client Tax Advisory Practices

(Alphabetical order)

Al Tamimi & Company

• Headquarters: Dubai, United Arab Emirates
• Founded: 1989

Al Tamimi & Company is a Middle East and North Africa law firm with an identifiable family business and private-client practice. It advises high-net-worth individuals, families, entrepreneurs, and family offices on succession, estate planning, governance, trusts, foundations, holding structures, cross-border tax planning, probate, and family matters.

The practice is relevant to regional and internationally mobile families using DIFC, ADGM, UAE mainland, and wider Middle Eastern structures. Its regional office network supports coordination across civil-law, common-law, Sharia, corporate, tax, and succession considerations.

Al Tamimi occupies Tier III because it is a broad regional law firm rather than a private-client tax boutique. Its dedicated private-client platform, regional authority, and ability to connect tax planning with local legal implementation nevertheless make it a defensible specialist inclusion.

ARKWOOD

• Headquarters: Paris, France
• Founded: 2015

ARKWOOD is a Paris law firm dedicated to private clients and wealth taxation. It advises French and international individuals, entrepreneurs, families, and trustees on estate planning, residence transfers, trusts, international successions, family groups, French-U.S. and French-UK matters, real estate, life insurance, reporting, and tax controversy.

The firm’s proposition is unusually concentrated. Its work addresses both planning and the recurring declarations required for income, real-estate wealth, trusts, foreign assets, residence changes, and inheritances. This makes it relevant to clients who need implementation as well as structural advice.

ARKWOOD occupies Tier III because it is a younger and more compact organization than the established French Tier II firm. Its sharp private-client focus, cross-border specialisms, and continuing professional recognition make it a strong boutique inclusion.

Bilzin Sumberg — Tax & Private Wealth

• Headquarters: Miami, United States
• Founded: 1998

Bilzin Sumberg is a Miami law firm with a Tax & Private Wealth practice serving domestic and international individuals, families, entrepreneurs, and investment structures. Its work includes estate planning, international taxation, inbound investment, trusts, family wealth structuring, and related controversy.

The practice is particularly relevant to Latin American, Caribbean, and other international families with U.S. assets, beneficiaries, residence, or investment exposure. Miami’s role as a cross-border private-wealth center strengthens the firm’s jurisdictional relevance.

Bilzin Sumberg occupies Tier III because private-client tax is one specialist practice within a broader law firm. The team’s international focus and U.S. planning capabilities nonetheless provide a distinctive and credible category fit.

Cadesky Tax

• Headquarters: Toronto, Canada
• Founded: 1986

Cadesky Tax is an independent Canadian tax consulting firm serving private businesses, owner-managers, multijurisdictional families, and high-net-worth individuals. Its work includes estate planning, family trusts, trust and estate taxation, corporate reorganizations, international tax, departure and arrival issues, and complex compliance.

The firm’s tax-only model and direct partner involvement give it a clear boutique identity. Its participation in an international specialist network also supports coordination where Canadian families, companies, beneficiaries, or investments connect with the United States and other countries.

Cadesky Tax occupies Tier III because it is smaller and more Canada-centered than the established-tier firms. Its technical concentration, educational contribution, and strong fit with owner-managed and family wealth make it a high-quality specialist inclusion.

HaysMac

• Headquarters: London, United Kingdom
• Founded: 1974

HaysMac is a UK accountancy and advisory firm with an active private-client tax practice. It serves individuals, entrepreneurs, business owners, families, trusts, and internationally connected clients on personal tax, residence, inheritance tax, trusts, succession, and compliance.

The practice is relevant where private wealth is linked to an operating business, employment, investments, or a cross-border move. The HaysMac identity adopted after the firm’s 2024 rebrand reflects a broader advisory platform while retaining its established UK partnership heritage.

HaysMac occupies Tier III because it is a credible mid-market professional firm, but its private-client practice is less defining internationally than those of Tier I and Tier II. Its current team and visible service line nevertheless justify inclusion.

Lenz & Staehelin

• Headquarters: Zurich, Switzerland
• Founded: 1917

Lenz & Staehelin is a Swiss law firm with substantial tax and private-client capabilities. It advises individuals, families, family offices, trustees, foundations, and wealth structures on Swiss and international taxation, estate planning, succession, residence, trusts, and philanthropy.

The firm is relevant to clients whose affairs involve Switzerland alongside other wealth centers. Its broader banking, corporate, disputes, and regulatory practices can assist where private-client structures interact with financial institutions, investments, companies, or contested matters.

Lenz & Staehelin occupies Tier III because it is a full-service commercial law firm rather than a private-client boutique. Its Swiss tax depth, institutional standing, and international private-wealth experience make it a strong specialist inclusion.

MHA

• Headquarters: London, United Kingdom
• Founded: 1869 legacy

MHA is a UK audit, tax, and advisory firm with a private-client practice serving individuals, families, entrepreneurs, business owners, and trusts. Its work includes personal tax, inheritance tax, residence, trusts, international matters, succession, and compliance.

The firm combines a UK operating platform with membership in Baker Tilly International. Its public-company structure and broader professional-services activities mean clients should distinguish the named UK practice from the international network and understand which entity provides each service.

MHA occupies Tier III because it is broader than a specialist private-client boutique. Its established UK presence, international connectivity, and visible private-client tax capabilities nevertheless support its place in the ranking.

Moore Kingston Smith

• Headquarters: London, United Kingdom
• Founded: 1923

Moore Kingston Smith is a UK accountancy and advisory firm providing personal tax, estate planning, inheritance-tax, trust, residence, and succession services to individuals, families, entrepreneurs, and business owners.

Its private-client work is strongest where personal and commercial affairs overlap. Membership in Moore Global adds international coordination, while the London operating firm retains responsibility for its own engagements and client relationships.

Moore Kingston Smith occupies Tier III because its private-client practice sits within a broad mid-market accountancy platform. Its traceable team, recurring compliance capability, and international network access make it a useful specialist-tier inclusion.

Pitcher Partners

• Headquarters: Melbourne, Australia
• Founded: 1991

Pitcher Partners is an Australian association of independent accounting and advisory firms with tax, private-wealth, family-office, and succession capabilities. Its member firms serve wealthy families, entrepreneurs, privately owned businesses, trusts, and investment entities.

The private-client proposition connects personal and business tax, structuring, family office administration, estate and succession planning, philanthropy, and reporting. The network model provides reach across major Australian cities, although clients engage a specific member firm rather than a single national partnership.

Pitcher Partners occupies Tier III because it is a broader association rather than a dedicated tax boutique and responsibility remains with the relevant member firm. Its Australian scale, private-business heritage, and family advisory depth nevertheless make it a credible international inclusion.

PKF O’Connor Davies — Private Client Services

• Headquarters: New York, United States
• Founded: 1891 legacy

PKF O’Connor Davies is a U.S. accounting, tax, and advisory firm with a private-client practice serving high-net-worth individuals, families, executives, business owners, and multigenerational wealth structures. Its services include income-tax planning and compliance, estate and gift planning, wealth transfer, trusts, and business succession.

The practice is particularly relevant to U.S. families whose personal wealth is connected to private companies, investments, foundations, or family-office arrangements. PKF International membership supports cross-border coordination while the U.S. firm remains the operating provider.

PKF O’Connor Davies occupies Tier III because it is a broad regional professional-services firm rather than a private-client tax boutique. Its scale, U.S. market presence, and identifiable private-client team justify specialist-tier recognition.

RSM Singapore — Private Client Services

• Headquarters: Singapore
• Founded: 1985 legacy

RSM Singapore is an independently operated member firm of the RSM network with a dedicated private-client and family-office practice. It serves business owners, wealthy families, and family offices through tax, wealth structuring, succession, governance, compliance, accounting, and administrative services.

The practice is particularly relevant to families establishing or operating family offices in Singapore and to Asian entrepreneurs with cross-border business and personal assets. Its services include global-footprint analysis, residence and domiciliation considerations, family tax compliance, FATCA and CRS coordination, exit planning, and ownership structuring.

RSM Singapore occupies Tier III because it is a broad accounting and advisory firm and should not be conflated with the global network as a single legal organization. Its clearly identified local private-client platform and Singapore family-office relevance support inclusion.

Schellenberg Wittmer

• Headquarters: Zurich, Switzerland
• Founded: 2000

Schellenberg Wittmer is a Swiss law firm with capabilities in taxation, private wealth, estate planning, trusts, foundations, relocation, succession, and cross-border structuring. It advises individuals, families, entrepreneurs, family offices, trustees, and financial institutions.

The private-client practice benefits from the firm’s wider corporate, banking, disputes, and regulatory expertise. This is useful where personal tax planning intersects with operating companies, financial structures, contentious estates, or international enforcement.

Schellenberg Wittmer occupies Tier III because it is a full-service law firm rather than a dedicated tax boutique. Its Swiss technical depth and cross-border private-client experience nevertheless make it a strong specialist inclusion.

Svalner Atlas

• Headquarters: Stockholm, Sweden
• Founded: 2005 legacy; current European group formed later

Svalner Atlas is a European tax and transaction advisory organization with a private-client and owner-managed-business practice. It advises founders, substantial shareholders, family businesses, and high-net-worth individuals on ownership structures, succession, investments, migration, asset protection, remuneration, and compliance.

The group has developed across the Nordic countries and the Netherlands. In June 2026, Svalner Atlas announced a combination with Ryan intended to create a larger European and global tax advisory platform; its inclusion refers to the continuing Svalner Atlas client-facing practice during the evaluation period.

Svalner Atlas occupies Tier III because the announced 2026 transaction, which was expected to complete in the third quarter, would change its ownership and institutional context, while the platform is broader than private wealth alone. Its specialist tax identity, regional reach, and identifiable private-client capability remain relevant.

Thorsteinssons

• Headquarters: Toronto, Canada
• Founded: 1964

Thorsteinssons is a Canadian law firm dedicated to taxation. Its estate-planning work serves individuals, families, trusts, estates, and owner-managed businesses, while the wider firm provides international tax, planning, representation, and controversy capabilities.

The practice is relevant where Canadian succession, trusts, private-company ownership, departure or arrival, and cross-border assets require specialist tax analysis. Its ability to advise on disputes as well as planning adds value where reporting positions or reorganizations may face authority scrutiny.

Thorsteinssons occupies Tier III because private clients form one part of a wider tax-law practice and the firm is principally Canada-centered. Its technical standing and dedicated tax identity make it a defensible specialist inclusion.

Tiberghien

• Headquarters: Brussels, Belgium
• Founded: 1939

Tiberghien is an independent tax law firm with a longstanding private-client practice. It advises high-net-worth individuals and families on domestic and cross-border estate planning, investments, family businesses, trusts and foundations, residence changes, philanthropy, family law, reporting, and tax disputes.

The firm’s multidisciplinary approach is especially relevant in Belgium and Luxembourg, where tax, civil law, matrimonial property, inheritance, family governance, and company ownership frequently interact. Its work extends from planning and rulings to compliance, mediation, and litigation.

Tiberghien occupies Tier III because its broader tax platform serves corporate and institutional matters as well as private clients. Its independent status, Benelux depth, and clearly established private-client practice make it a high-quality specialist inclusion.

---

Remarks

Private-client tax rankings require careful interpretation. No firm is equally strong in every jurisdiction, and the correct adviser for a domestic estate may differ from the correct lead adviser for a family with citizenship, residence, beneficiaries, businesses, trusts, and investments spread across several countries.

Clients should confirm the exact legal entity and professionals responsible for an engagement, especially where a firm operates through a network, association, international grouping, or recently combined platform. Brand reach does not eliminate the need to define scope, privilege, liability, conflicts, referrals, implementation responsibilities, and the coordination of local counsel.

Tier classification reflects relative institutional scale, private-client tax depth, cross-border capability, professional reputation, implementation strength, and relevance to the international private-wealth ecosystem. It does not measure tax savings, guarantee the acceptance of a position by any authority, or recommend a particular adviser, jurisdiction, entity, residence, transaction, or succession strategy.

This ranking does not constitute tax, legal, fiduciary, investment, immigration, accounting, or estate-planning advice. Tax outcomes depend on individual facts, evolving law, residence, citizenship, asset location, ownership, documentation, and implementation. Readers should obtain independent advice in every relevant jurisdiction before acting.

---

Recognition

Organizations included in the Ranking News Top 30 Private Client Tax Advisory Boutiques 2026 ranking may request information regarding authorized use of the Ranking News designation for marketing and communications purposes.

Recognized institutions may reference the designation in:

• corporate websites
• investor communications
• marketing materials
• client presentations

Ranking inclusion is editorially determined and independent of licensing, advertising, or commercial participation. Recognition-materials licenses govern only the use of official Ranking News / Wealth Ranking assets, approved wording, and related communications materials.

Licensing inquiries:
[email protected]