Top 20 Private Client Tax Advisory Boutiques 2025

This report forms part of the Ranking News Private Wealth series, which evaluates independent advisory and investment institutions and family offices across global wealth management markets.

Private client tax advisory firms remain an essential component of the international wealth management ecosystem. As wealth becomes increasingly global and regulatory transparency expands across financial centers, high-net-worth individuals require increasingly sophisticated tax planning strategies spanning multiple jurisdictions.

Private client tax advisors assist wealthy families through services including cross-border tax structuring, estate planning, trust taxation advisory, and tax residency planning. These advisory services have become particularly important as governments implement increasingly complex reporting frameworks and compliance standards affecting internationally mobile wealth.

London continues to serve as one of the most influential centers for private client tax advisory globally, hosting many long-established advisory firms with deep expertise in international taxation. Financial jurisdictions such as Jersey, Guernsey, Luxembourg, and the Isle of Man also play important roles through their connections with trust administration and fiduciary services.

The Ranking News Top Private Client Tax Advisory Boutiques 2025 ranking recognizes advisory practices whose technical expertise, international experience, and institutional reputation position them among the most established tax advisors serving globally mobile families.

Market Overview

Private client tax advisory continues to evolve alongside growing wealth mobility and expanding international reporting frameworks. Families with globally diversified assets increasingly require advisory services capable of coordinating tax planning across multiple jurisdictions.

Advisors now frequently work alongside wealth managers, fiduciary firms, and family offices to develop integrated strategies for wealth preservation and generational succession. In many cases, tax advisory firms serve as central coordinators within broader wealth governance structures.

This growing complexity has strengthened demand for boutique advisory firms with specialized expertise in international taxation and cross-border wealth structuring.

Industry Trend — 2025

In 2025, regulatory transparency and tax reporting requirements continued shaping the private client advisory sector. Advisors increasingly focused on integrated wealth governance strategies that combine tax planning with estate structuring and family office advisory.

Many firms have expanded their services to support internationally mobile families navigating relocation planning, cross-border asset ownership, and multigenerational wealth transfer strategies.

Firms with strong expertise in international tax frameworks and long-standing reputations within private client advisory continue to occupy leading positions within the sector.

Methodology — Core Eligibility Criteria

To ensure consistency within the Private Client Tax Advisory category, firms included in the ranking were evaluated based on the following criteria:

• Provides specialized private client tax advisory services
• Maintains international client operations
• Demonstrates expertise in cross-border tax planning
• Advises high-net-worth individuals or family offices
• Maintains recognized reputation within private client taxation

Large accounting networks were included only where their private client divisions operate as specialized advisory practices.

Methodology — Ranking Factors

Institutions were evaluated based on qualitative considerations including:

• Institutional reputation within private client taxation
• Technical expertise in international tax planning
• Breadth of advisory services for wealthy individuals
• Experience with cross-border wealth structures
• Operational track record in the private client advisory sector

Tier classifications reflect relative institutional positioning within the private client tax advisory market.

The Ranking News Top Private Client Tax Advisory Boutiques 2025 ranking reviewed approximately 30 global advisory firms, from which 20 institutions were selected.

Tier classifications reflect relative institutional positioning rather than investment performance.

Tier I — Leading Private Client Tax Advisory Firms

Saffery LLP

• Headquarters: London, United Kingdom
• Founded: 1855

Saffery LLP continues to maintain a leading position within the private client tax advisory sector. The firm has developed deep expertise advising high-net-worth individuals, entrepreneurs, and family offices on complex international tax planning strategies and estate structuring arrangements.

Saffery’s private client advisory platform frequently supports internationally mobile families navigating tax residency rules, cross-border asset ownership, and multijurisdictional wealth structures. The firm’s advisory capabilities extend across estate planning, trust taxation, and succession strategies designed for multigenerational wealth preservation.

Through its long-standing reputation within London’s private client advisory community and its global advisory network, Saffery continues to serve as a key advisor for internationally diversified families requiring sophisticated tax planning solutions.

Rawlinson & Hunter

• Headquarters: London, United Kingdom
• Founded: 1933

Rawlinson & Hunter remains one of the most respected advisory firms within the private client taxation sector. The firm advises wealthy families and family offices on complex tax planning strategies including estate structuring, trust taxation, and international wealth governance.

Its advisory approach combines tax planning expertise with fiduciary services and wealth governance advisory, enabling the firm to support sophisticated multijurisdictional wealth structures.

Rawlinson & Hunter’s global network of offices and long-standing institutional reputation continue to position the firm among the leading private client tax advisors serving internationally mobile clients.

Buzzacott LLP

• Headquarters: London, United Kingdom
• Founded: 1919

Buzzacott LLP remains a prominent private client tax advisory firm within London’s professional services sector. The firm advises entrepreneurs, investors, and high-net-worth families managing assets across multiple jurisdictions.

Buzzacott’s private client practice focuses on tax residency planning, estate structuring, and cross-border wealth planning strategies. The firm frequently works with internationally active entrepreneurs navigating complex tax planning challenges arising from global business operations.

Its long history within the United Kingdom’s advisory community and strong reputation for technical expertise continue to reinforce Buzzacott’s role as a trusted advisor for internationally mobile wealth.

Withers LLP Tax Advisory

• Headquarters: London, United Kingdom
• Founded: 1896

Withers LLP continues to operate one of the most internationally recognized private client advisory platforms combining legal and tax advisory expertise. The firm advises wealthy families and entrepreneurs navigating complex cross-border wealth structures and international estate planning.

Withers frequently supports clients requiring sophisticated advisory services spanning multiple jurisdictions, including international trust structures, succession planning, and tax residency strategies.

Through its global network of offices and multidisciplinary advisory approach, Withers remains among the most influential firms providing integrated tax and legal advisory services for internationally diversified families.

Frank Hirth

• Headquarters: London, United Kingdom
• Founded: 1972

Frank Hirth continues to strengthen its position as a specialist advisory firm focused on cross-border tax planning for internationally mobile individuals. The firm is particularly well known for advising clients navigating complex tax residency issues and international relocation planning.

Frank Hirth’s advisory practice frequently supports entrepreneurs, executives, and globally mobile professionals managing tax obligations across multiple jurisdictions. The firm’s expertise in UK-US tax advisory and international tax compliance continues to position it as a leading specialist advisory practice within the private client tax sector.

Tier II — Established Private Client Tax Advisory Firms

(Alphabetical order)

Andersen Private Client Tax

• Headquarters: London, United Kingdom
• Founded: 2013

Andersen provides private client tax advisory services through its global professional services network. The firm advises entrepreneurs, investors, and internationally mobile families on cross-border tax planning and residency structuring strategies.

Its international presence allows Andersen to support clients navigating complex tax obligations across multiple jurisdictions. Services include tax compliance, wealth structuring advisory, and estate planning support designed for globally diversified families.

Blick Rothenberg

• Headquarters: London, United Kingdom
• Founded: 1945

Blick Rothenberg specializes in private client tax advisory services with a strong focus on international tax planning and wealth structuring. The firm frequently advises entrepreneurs and internationally mobile individuals navigating complex residency and relocation issues.

Its advisory practice often supports individuals relocating to or from the United Kingdom, addressing tax planning considerations associated with cross-border mobility.

Evelyn Partners

• Headquarters: London, United Kingdom
• Founded: 1836

Evelyn Partners provides integrated wealth management and private client tax advisory services. The firm supports high-net-worth individuals and family offices through tax planning, estate structuring, and succession advisory.

Its integrated advisory platform enables coordination between investment management and tax planning strategies for internationally diversified families.

Grant Thornton Private Client

• Headquarters: London, United Kingdom
• Founded: 1924

Grant Thornton provides private client tax advisory services through its specialized advisory practice. The firm advises entrepreneurs and wealthy families on estate planning, tax compliance, and international wealth structuring strategies.

Mazars Private Client Services

• Headquarters: Paris, France
• Founded: 1945

Mazars offers private client advisory services through its international accounting and advisory network. The firm supports wealthy individuals and family offices requiring cross-border tax planning and wealth structuring advisory.

Moore Kingston Smith Private Client

• Headquarters: London, United Kingdom
• Founded: 1923

Moore Kingston Smith provides tax advisory services for entrepreneurs and high-net-worth families requiring estate planning and international wealth structuring advisory.

Nexia Private Client Services

• Headquarters: London, United Kingdom
• Founded: 1971

Nexia provides private client tax advisory services through its international network of professional advisory firms specializing in cross-border wealth planning.

Stonehage Fleming Tax Advisory

• Headquarters: London, United Kingdom
• Founded: 1976

Stonehage Fleming provides private client tax advisory as part of its broader multi-family office platform serving wealthy families requiring integrated wealth governance advisory.

UHY Hacker Young Private Client

• Headquarters: London, United Kingdom
• Founded: 1925

UHY Hacker Young advises entrepreneurs and wealthy individuals on private client tax planning, compliance, and wealth structuring matters.

Tier III — Boutique Private Banks

(Alphabetical order)

• Altum Group Tax Advisory
• Bedell Cristin Tax Advisory
• Equiom Tax Services
• Harneys Tax Advisory
• PKF Private Client Tax

Remarks

Private client tax advisory firms remain an important component of the international wealth management ecosystem. These institutions specialize in cross-border tax planning, estate structuring, and advisory services designed to support the complex financial affairs of high-net-worth families.

The firms recognized in this ranking represent advisory practices whose expertise in international taxation and wealth planning continues to maintain relevance within the private client advisory sector. Tier classifications reflect relative institutional positioning within the advisory industry rather than the tax outcomes achieved for individual clients.

Tier classification reflects relative institutional scale, advisory platform maturity, and engagement with the private wealth ecosystem. The ranking does not constitute a performance evaluation or recommendation of investment services.

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Recognition

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