Company lists · Data refreshed October 2026

Top 25 International tax compliance firms based in the United Kingdom

Name: International tax compliance firms based in the United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 22, 2026 240 companies tracked

RevenueBase identified 240 company matches for international tax compliance firms associated with the United Kingdom as of October 2026 and tracks 1,529 professional contacts across them, including 660 with verified work emails. London is the largest hub.

This list covers company matches for international tax compliance firms associated with the United Kingdom, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 22, 2026 How this list was built

240Companies

1,529Contacts tracked

660Verified emails

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The 25 largest international tax compliance firms based in the United Kingdom

Ranked by team size

Top 25 of 240 company matches for international tax compliance firms based in the United Kingdom, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 22, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	EY Private Client Services	Exact match	London, United KingdomHQ recorded Oct 22, 2026	10001+	174 contacts →
	Exact match “Thoughtfully structuring and managing your tax affairs is more important than ever.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
2	Ustaxfs	Exact match	London, United KingdomHQ recorded Oct 22, 2026	51-200	70 contacts →
	Exact match “USTAXFS are the largest independent tax accounting firm in the UK & Europe specialising in US tax, including the complex specialism of US and UK cross-border tax planning.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
3	TAX Advisory Partnership	Exact match	London, United KingdomHQ recorded Oct 22, 2026	51-200	55 contacts →
	Exact match “The Tax Advisory Partnership is a young and vibrant London-based organisation, which brings together a wealth of wide ranging experience and expertise in all areas of UK and US…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
4	PJD TAX Consultants LTD	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	41 contacts →
	Exact match “PJD Tax is a tax consultancy business, based in Clerkenwell and specializing in US and UK tax compliance and consulting matters for individuals; especially Americans/GCH based in…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
5	TBA Global	Exact match	London, United KingdomHQ recorded Oct 22, 2026	51-200	40 contacts →
	Exact match “TBA Global (also known as TB Accountants) is your trusted partner for accounting and tax solutions!” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
6	Everfair TAX	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	30 contacts →
	Exact match “As specialists in UK, US and Expatriate Tax, we provide unique tax advisory and compliance services that assist both individuals and companies.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
7	Ibiss & CO Limited	Exact match	London, United KingdomHQ recorded Oct 22, 2026	1-10	28 contacts →
	Exact match “not all accountants are tax specialists and not all tax consultants are accountants" At IBISS & CO we appreciate the value of working together as a team.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
8	WTT	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	28 contacts →
	Exact match “WTT provides experienced tax advisers, legal experts and finance professionals.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
9	Knav UK	Exact match	London, United KingdomHQ recorded Oct 22, 2026	51-200	27 contacts →
	Exact match “KNAV is a dynamic global accounting and consulting firm, offering a comprehensive range of services including accounting, assurance, taxation, international transfer pricing…” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
10	Xcelentra Financial Services LTD	Exact match	Milton Keynes, United KingdomHQ recorded Oct 22, 2026	51-200	26 contacts →
	Exact match “Xcelentra specializes in accounting, taxation, payroll, finance, and immigration services across the UK and Europe.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
11	Robertson Craig	Exact match	Glasgow, United KingdomHQ recorded Oct 22, 2026	11-50	21 contacts →
	Exact match “Robertson Craig is an independent firm of Chartered Accountants and Chartered Tax Advisers, based in Glasgow.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
12	Pinnick Lewis Chartered Certified Accountants	Exact match	Edgware, United KingdomHQ recorded Oct 22, 2026	11-50	20 contacts →
	Exact match “Pinnick Lewis are a long established two partner firm of Chartered Certified Accountants, we specialise in dealing with small to medium sized businesses.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
13	Caribou	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	20 contacts →
	Exact match “We set Transfer Pricing policies for global businesses.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
14	Laggan & Associates LTD	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	17 contacts →
	Exact match “Laggan is an independent firm providing international tax consultancy, corporate and business advisory services.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
15	Lishmans LLP	Exact match	Sheffield, United KingdomHQ recorded Oct 22, 2026	11-50	17 contacts →
	Exact match “Our mission is to advise, guide and support our clients to ensure they become as successful as all their hard work should make them.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
16	RHJ Group	Exact match	Sheffield, United KingdomHQ recorded Oct 22, 2026	11-50	17 contacts →
	Exact match “RHJ Group is an international advisory firm specialising in global tax services, legal structuring and corporate compliance for expats, investors, and multinational companies.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
17	DAS TAX And Advisory Group US And UK	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	17 contacts →
	Exact match “A thriving business is always seeking to grow.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
18	Moore Family Office Limited	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	16 contacts →
	Exact match “We provide specialist advice and services to internationally based families in their overseas locations and additionally look after their UK requirements.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
19	Wilkins Southworth	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	15 contacts →
	Exact match “Established in 1993, Wilkins Southworth is a friendly firm of accountants based in Barnes, South West London.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
20	Blue Peak Consulting Limited	Exact match	Reading, United KingdomHQ recorded Oct 22, 2026	11-50	15 contacts →
	Exact match “At Blue Peak our team consists of former Big Four tax and accounting professionals with a wealth of experience both in practice and industry in technical and commercial roles.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
21	Moregroup	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	14 contacts →
	Exact match “Welcome to More Group, a global practice of accounting, international tax and corporate service specialists.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
22	LCN Legal	Exact match	Mayfair, United KingdomHQ recorded Oct 22, 2026	1-10	13 contacts →
	Exact match “We are specialists in managing the legal implementation of transfer pricing policies and group reorganizations.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
23	Neptune TAX	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	12 contacts →
	Exact match “Qualified US and UK tax advisors.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
24	INTAX	Exact match	London, United KingdomHQ recorded Oct 22, 2026	11-50	12 contacts →
	Exact match “inTAX is a small, specialist tax firm, whose managing partner and team have many years experience.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase
25	Citrine International TAX	Exact match	Oxford, United KingdomHQ recorded Oct 22, 2026	11-50	12 contacts →
	Exact match “Both the UK and US have demonstrated a shared desire to combat tax evasion in recent years.” Recorded in the RevenueBase company graph · Oct 22, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “international tax compliance firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 240 international tax compliance firms based in the United Kingdom

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International tax compliance firms based in the United Kingdom at a glance

As of Oct 22, 2026

43.2%Verified-email coverage

6.4Average contacts per company

1-10Median size (employees)

50.8%Largest-city concentration · London

Oct 22, 2026Page data refreshed

Companies by employee count

1-10

157

11-50

51-200

201-500

1,001-5,000

10001+

Email recency for this list is measured worldwide rather than for United Kingdom, so it is reported there. Company counts and contact totals on this page are exact for United Kingdom, over 240 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United Kingdom whose business descriptions match “international tax compliance firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 660 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 22, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

International tax compliance firms by metro

International tax compliance firms in London122

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “international tax compliance firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many international tax compliance firms are there based in the United Kingdom?

RevenueBase identified 240 company matches for international tax compliance firms associated with the United Kingdom as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

EY Private Client Services tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most international tax compliance firms?

London leads with 122 company records, followed by Manchester (5) and Birmingham (4).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 660 professional contacts with verified work emails tracked across these 240 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 22, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.