Company lists · Data refreshed September 2026

Top 25 Tax advisory firms based in London, United Kingdom

Name: Tax advisory firms based in London, United Kingdom
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 486 companies tracked

RevenueBase identified 486 tax advisory firms headquartered in London, United Kingdom as of September 2026 and tracks 7,521 professional contacts across them, including 3,531 with verified work emails. London is the largest hub.

This list covers tax advisory firms headquartered in London, United Kingdom, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 22, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 22, 2026 86% judged on-target in blind review

486Companies

7,521Contacts tracked

3,531Verified emails

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The 25 largest tax advisory firms based in London, United Kingdom

Ranked by team size

Top 25 of 486 tax advisory firms based in London, United Kingdom, ranked by team size, largest first. Data refreshed Sep 22, 2026. RevenueBase Smart Search rates how each company's information relates to tax advisory firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Moore Kingston Smith	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	501-1,000	1,151 contacts →
	Indirect evidence “At Moore Kingston Smith, we believe in the potential of people to make a positive impact, fuelled by the power of genuine understanding.” Source: RevenueBase Database · checked Sep 22, 2026
2	Haysmac	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	501-1,000	655 contacts →
	Strong evidence “HaysMac is an award‑winning accountancy, tax and advisory firm, known for delivering expert, partner‑led advice to ambitious organisations and individuals.” Source: RevenueBase Database · checked Sep 22, 2026
3	Buzzacott	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	501-1,000	575 contacts →
	Partial evidence “Buzzacott is an accountancy and advisory firm with a long-standing history of supporting individuals, businesses, and not-for-profits.” Source: RevenueBase Database · checked Sep 22, 2026
4	Lubbock Fine	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	203 contacts →
	Strong evidence “Lubbock Fine is an independent accounting, tax, audit and advisory firm in the City of London.” Source: RevenueBase Database · checked Sep 22, 2026
5	Sopher CO	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	201-500	185 contacts →
	Partial evidence “Sopher + Co is one of the most entrepreneurial and progressive firms of accountants, business advisers, tax and corporate finance consultants in London.” Source: RevenueBase Database · checked Sep 22, 2026
6	EY Private Client Services	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	10001+	177 contacts →
	Partial evidence “Thoughtfully structuring and managing your tax affairs is more important than ever.” Source: RevenueBase Database · checked Sep 22, 2026
7	Dixon Wilson	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	153 contacts →
	Indirect evidence “Dixon Wilson is one of the leading firms of Chartered Accountants based in London.” Source: RevenueBase Database · checked Sep 22, 2026
8	Accounts And Legal	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	133 contacts →
	Indirect evidence “Traditional accountants do a great job of the numbers, but that's often as far as the service goes.” Source: RevenueBase Database · checked Sep 22, 2026
9	Alliotts LLP	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	114 contacts →
	Indirect evidence “Alliotts LLP is based in London and Guildford.” Source: RevenueBase Database · checked Sep 22, 2026
10	AOG	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	101 contacts →
	Partial evidence “Welcome to AOG, your esteemed accounting and tax partner, serving SMEs and high-net-worth individuals in the UK and abroad.” Source: RevenueBase Database · checked Sep 22, 2026
11	The FRY Group	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	85 contacts →
	Partial evidence “We are a team of helpful tax and financial planning experts, here to listen, understand your needs and circumstances and make all aspects of dealing with your finances simple…” Source: RevenueBase Database · checked Sep 22, 2026
12	Ustaxfs	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	75 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 22, 2026
13	Fusion Consulting Group	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	62 contacts →
	Partial evidence “Fusion is a multi-disciplinary consulting firm that offers 360 degree advisory services and end-to-end solutions for private individuals and fast growth businesses.” Source: RevenueBase Database · checked Sep 22, 2026
14	Bright Grahame Murray	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	53 contacts →
	Indirect evidence “Bright Grahame Murray is a medium-sized firm of Chartered Accountants based in Kensington, London, SW7.” Source: RevenueBase Database · checked Sep 22, 2026
15	TAX Advisory Partnership	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	51 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 22, 2026
16	Lawrence Grant LLP	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	51 contacts →
	Indirect evidence “We’ve been around for a while now, celebrating our 50th anniversary in 2020.” Source: RevenueBase Database · checked Sep 22, 2026
17	Ground Control	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	49 contacts →
	Indirect evidence “We pride ourselves on creating and sustaining supportive client relationships, based on commercially astute and timely advice which enables our clients to excel.” Source: RevenueBase Database · checked Sep 22, 2026
18	Sheltons Group	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	48 contacts →
	Indirect evidence “We provide accounting, business advice and assistance for businesses investing abroad.” Source: RevenueBase Database · checked Sep 22, 2026
19	Accountax Consultants UK Limited	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	48 contacts →
	Indirect evidence “ACCOUNTAX.” Source: RevenueBase Database · checked Sep 22, 2026
20	Diacron Group	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	42 contacts →
	Partial evidence “Diacron Group provides accounting, tax and corporate services.” Source: RevenueBase Database · checked Sep 22, 2026
21	Warrener Stewart	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	40 contacts →
	Strong evidence “Warrener Stewart is a firm of chartered accountants, chartered tax advisors and registered auditors based in Fulham.” Source: RevenueBase Database · checked Sep 22, 2026
22	Source Advisors UK	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	37 contacts →
	Strong evidence “Source Advisors, previously GovGrant in the UK, is a long-established specialist in all things innovation and R&D tax relief.” Source: RevenueBase Database · checked Sep 22, 2026
23	TBA Global	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	37 contacts →
	Partial evidence “TBA Global (also known as TB Accountants) is your trusted partner for accounting and tax solutions!” Source: RevenueBase Database · checked Sep 22, 2026
24	TAJ Accountants	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	n/a	35 contacts →
	Indirect evidence “Taj Accountants stands high among the renowned accountancy firms in London for offering outstanding accounting and taxation advice to corporates, as well as individuals.” Source: RevenueBase Database · checked Sep 22, 2026
25	Cohen Arnold	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	34 contacts →
	Strong evidence “Cohen Arnold is a long-established and professional firm of Chartered Accountants and Tax Advisors based in London.” Source: RevenueBase Database · checked Sep 22, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: tax advisory firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names tax advisory firms.
Partial evidence: Its own public description names part of tax advisory firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name tax advisory firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 486 tax advisory firms based in London, United Kingdom

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Tax advisory firms based in London, United Kingdom at a glance

As of Sep 22, 2026

46.9%Verified-email coverage

15.5Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

301

11-50

140

51-200

201-500

501-1,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United Kingdom list rather than for London, so it is reported there. Company counts and contact totals on this page are exact for London, over 486 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among tax advisory firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in London, United Kingdom whose own description of what they do matches “tax advisory firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names tax advisory firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among tax advisory firms, and records with no verified work email. Companies headquartered outside London are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 3,531 across the full list. 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 September 22, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Tax advisory firms by metro in the United Kingdom

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names tax advisory firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many tax advisory firms are there based in London, United Kingdom?

RevenueBase identified 486 tax advisory firms headquartered in London, United Kingdom as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Moore Kingston Smith, headquartered in London, tops this list with the largest team on record.

Which city has the most tax advisory firms?

London leads with 486 headquartered companies, followed by Birmingham (47) and Manchester (42).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 3,531 verified decision-maker contacts tracked across these 486 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 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 Smart Search, 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.