The 9 Best US Tax Accountants in London (2026)

1. Blick Rothenberg — Covent Garden, Soho & the West End

A dedicated US/UK private-client practice built around Americans living in the UK.

Blick Rothenberg runs a dedicated US/UK private-client team that prepares and plans both sides of an American's tax affairs: federal and state returns, foreign asset reporting, UK Self Assessment, residency and arrival or exit planning, and IRS enquiries. It also advises on combined US estate and UK inheritance tax planning and on trusts. The firm acquired the US–UK specialist Westleton Drake in 2018.

Its client list, by its own description, includes US citizens living in the UK, wealthy expats, private-equity executives with carried interest, and people going through divorce with assets in both countries. A strong choice when your affairs are more than a salary and a bank account.

Good to know: Ask how the firm's planning has changed since the UK replaced the non-dom regime in April 2025; it has published guidance specifically for Americans.

16 Great Queen Street, London WC2B 5AH

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2. Deloitte — City of London (New Street Square)

A Big Four firm with a large London-based US/UK high-net-worth tax team.

Deloitte's UK firm runs its US personal tax work through a London-based US/UK High Net Worth team, which it says is by far the largest team of US personal tax professionals of any Big Four firm outside the US, with more than 45 US personal tax specialists.

It suits wealthy individuals and families with complex structures, multiple jurisdictions or significant investment income. For a straightforward employee return it will be more than you need, and priced accordingly.

Good to know: Ask specifically for the US/UK High Net Worth team, not the general private-client group.

1 New Street Square, London EC4A 3HQ

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3. EY (EY Frank Hirth) — London Bridge (More London), South Bank & Borough

The Big Four home of Frank Hirth, the long-time London US/UK personal tax specialist.

In 2021 EY bought the personal tax business of Frank Hirth, a London firm known for decades as a specialist in US and UK personal tax, bringing its people and clients into EY's private tax practice as EY Frank Hirth. EY's UK private-client work is led by its high-net-worth teams, supported by a US/UK cross-border team.

It is a natural fit for former Frank Hirth clients and for wealthy Americans who want a Big Four adviser with US personal tax depth in London.

Good to know: If you were a Frank Hirth client, your records and team moved to EY; ask for EY Frank Hirth by name.

1 More London Place, London SE1 2AF

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4. BDO — Marylebone, Soho & the West End

A mid-tier firm with a London-based US expatriate tax team.

BDO's US expatriate tax team is based in London and specialises in US tax for expatriates: federal and state returns, FBAR reporting and related compliance. It works both for individuals and for employers managing internationally mobile staff.

A good middle option between the Big Four and the small specialists, especially if your employer already uses BDO for its global mobility programme.

Good to know: If you are on an international assignment, check whether your employer has a tax-equalisation arrangement with BDO already in place.

55 Baker Street, London W1U 7EU

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5. US Tax & Financial Services (USTAXFS) — Holborn

A specialist US tax firm for Americans in the UK and Europe, with US attorneys on the team.

USTAXFS specialises in US tax for expats and multinationals, with offices in London, Zurich and Geneva. Its team combines US tax accountants, dual US/UK tax professionals and US attorneys, and covers US federal and state returns and UK Self Assessment, catch-up filings under the streamlined procedures, delinquent FBAR and Form 8938 filings, and trust and business reporting.

It suits Americans whose affairs go beyond a salary — property, pensions, trusts, a UK company — and anyone who needs to catch up on years of missed filings.

Good to know: If you are behind on filings, ask about the streamlined procedures at the first call, before you file anything yourself.

Staple Court, 11 Staple Inn, London WC1V 7QH

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6. Bambridge Accountants — Covent Garden, Soho & the West End

A Covent Garden firm focused on US/UK tax for expatriates, with a New York office too.

Bambridge Accountants specialises in US/UK tax services for expatriates, with more than 15 years' experience and offices in London and New York. It prepares US and UK returns, handles back filing and catch-up, and supports offshore and voluntary disclosures.

A smaller, specialist practice that suits Americans who want one firm to prepare both countries' returns at a lower cost than the large firms.

Good to know: The London office is on Henrietta Street, a couple of minutes from Covent Garden station; book ahead rather than dropping in.

7 Henrietta Street, London WC2E 8PS

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7. HTJ.tax — City of London (Cannon Street)

A US expat and international tax specialist run by Enrolled Agents and CPAs.

HTJ.tax helps Americans abroad and international investors stay compliant across borders, with Enrolled Agents and CPAs on its team. Its services cover US expat returns, streamlined filings for those who are behind, FBAR and FATCA reporting, PFIC calculations, foreign tax credit planning and pre-move or expatriation planning. It is a member firm of the Moores Rowland international network.

Its London office is on Dowgate Hill, by Cannon Street station.

Good to know: If you hold UK funds or investment trusts, ask about PFIC reporting; it is one of the firm's stated specialisms.

Dowgate Hill House, 14–16 Dowgate Hill, London EC4R 2SU

Google Maps Website

8. Satis Tax — St James's (Pall Mall), Soho & the West End

A Pall Mall boutique for people with UK, US and overseas tax interests.

Satis Tax is a London firm offering specialist tax and accountancy services to individuals and businesses with UK, US or overseas interests. Its stated client groups include US expats, accidental Americans, non-doms and entrepreneurs doing business in the US, and it handles both the UK and US annual returns as well as planning before a move.

It sits alongside a sister financial-planning business, Satis Wealth Management, which suits Americans who want tax and investment advice that takes both systems into account.

Good to know: Ask whether tax and investment advice can be coordinated in-house; investing as an American in the UK is where mistakes get expensive.

Ground Floor, 45 Pall Mall, London SW1Y 5JG

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9. Greenback Expat Tax Services — Online

A well-known online US expat tax preparer, for Americans whose UK affairs are simple.

Greenback is an online US expat tax service whose team of CPAs and IRS Enrolled Agents prepares US returns for Americans living abroad, including FBARs and catch-up filings. It has no London office; everything is handled remotely.

It suits Americans in London with a salary, a few bank accounts and no complicated investments, who want a US return done well at a published price. If you also need the UK return, or have property, a business or trusts, a London firm that prepares both is usually the better choice.

Good to know: Greenback prepares US returns only; you will still need to file UK Self Assessment yourself or with a UK accountant if you have to file one.

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