Company lists · Data refreshed September 2026

Top 25 Tax advisory services based in London, United Kingdom

Name: Tax advisory services 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 395 companies tracked

RevenueBase identified 395 tax advisory services headquartered in London, United Kingdom as of September 2026 and tracks 4,301 professional contacts across them, including 2,158 with verified work emails. London is the largest hub.

This list covers tax advisory services 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

395Companies

4,301Contacts tracked

2,158Verified emails

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

Ranked by team size

Top 25 of 395 tax advisory services 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 services: 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	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
2	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
3	Gravita	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	201-500	379 contacts →
	Indirect evidence “Welcome to the new era of accountancy.” 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	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
6	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
7	Bonham & Brook	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	51-200	88 contacts →
	Strong evidence “We are innovation and funding experts, specialising in consultancy and advisory services for R&D Tax Credits, Energy Tax Relief, Capital Allowances, Land Remediation Tax Relief…” Source: RevenueBase Database · checked Sep 22, 2026
8	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
9	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
10	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
11	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
12	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
13	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
14	Sayers Butterworth LLP	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	48 contacts →
	Indirect evidence “At Sayers Butterworth LLP we believe that clients come first.” Source: RevenueBase Database · checked Sep 22, 2026
15	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
16	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
17	PSB Accountants Limited	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	42 contacts →
	Indirect evidence “At PSB Accountants, we put your goals and aspirations first.” Source: RevenueBase Database · checked Sep 22, 2026
18	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
19	Everfair TAX	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	31 contacts →
	Strong evidence “As specialists in UK, US and Expatriate Tax, we provide unique tax advisory and compliance services that assist both individuals and companies.” Source: RevenueBase Database · checked Sep 22, 2026
20	Haggards Crowther Chartered Accountants	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	29 contacts →
	Partial evidence “Haggards Crowther is a firm of Chartered Accountants and Tax Advisers established in the Fulham since 2004.” Source: RevenueBase Database · checked Sep 22, 2026
21	Lanop Business & TAX Advisors	Strong evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	28 contacts →
	Strong evidence “Lanop Business & Tax Advisors, headquartered in South West London, is dedicated to delivering a full spectrum of accounting and tax services tailored to the unique needs of each…” Source: RevenueBase Database · checked Sep 22, 2026
22	WTT	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	28 contacts →
	Partial evidence “WTT provides experienced tax advisers, legal experts and finance professionals.” Source: RevenueBase Database · checked Sep 22, 2026
23	Ibiss & CO Limited	Partial evidence	London, United KingdomHQ checked Sep 22, 2026	1-10	26 contacts →
	Partial evidence “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.” Source: RevenueBase Database · checked Sep 22, 2026
24	Peterson James & CO LTD	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	25 contacts →
	Indirect evidence “We work with individuals and companies of all sizes and in all industries.” Source: RevenueBase Database · checked Sep 22, 2026
25	Goldblatts	Indirect evidence	London, United KingdomHQ checked Sep 22, 2026	11-50	18 contacts →
	Indirect evidence “The provision of accounting, auditing, taxation services and business advice to a number of clients ranging from individuals to small, medium and large groups of privately owned…” 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 services. 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 services.
Partial evidence: Its own public description names part of tax advisory services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name tax advisory services. 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 395 tax advisory services based in London, United Kingdom

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

As of Sep 22, 2026

50.2%Verified-email coverage

10.9Average contacts per company

1-10Median size (employees)

100.0%Largest-city concentration · London

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

270

11-50

100

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 395 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 services, 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 services”. 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 services), 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 services, 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, 2,158 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 services by metro in the United Kingdom

Tax advisory services in London395
Tax advisory services in Manchester33
Tax advisory services in Birmingham30

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 services, 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 services are there based in London, United Kingdom?

RevenueBase identified 395 tax advisory services 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?

Haysmac, headquartered in London, tops this list with the largest team on record.

Which city has the most tax advisory services?

London leads with 395 headquartered companies, followed by Manchester (33) and Birmingham (30).

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 2,158 verified decision-maker contacts tracked across these 395 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.