Company lists · Data refreshed September 2026

Top 25 Corporate tax firms worldwide

Name: Corporate tax firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 31,448 companies tracked

RevenueBase identified 31,448 corporate tax firms worldwide as of September 2026 and tracks 266,178 professional contacts across them, including 67,525 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers corporate tax firms worldwide, 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 19, 2026. Country and city lists for corporate tax firms follow the table.

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 19, 2026 86% judged on-target in blind review

31,448Companies

266,178Contacts tracked

67,525Verified emails

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The 25 largest corporate tax firms worldwide

Ranked by team size

Top 25 of 31,448 corporate tax firms worldwide, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to corporate tax 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	H&r Block	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	10001+	59,451 contacts →
	Indirect evidence “H&R Block’s purpose is simple: To provide help and inspire confidence in our clients and communities everywhere.” Source: RevenueBase Database · checked Sep 19, 2026
2	RYAN	Partial evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	5,001-10,000	6,089 contacts →
	Partial evidence “Ryan, an award-winning global tax services and software provider, is the largest Firm in the world dedicated exclusively to business taxes.” Source: RevenueBase Database · checked Sep 19, 2026
3	Garrigues	Partial evidence	Madrid, SpainHQ checked Sep 19, 2026	1,001-5,000	2,853 contacts →
	Partial evidence “Garrigues is an international legal and tax services firm that advises clients locally, regionally and globally from every angle of business law.” Source: RevenueBase Database · checked Sep 19, 2026
4	TAX Consultant	Indirect evidence	Brighton, United KingdomHQ checked Sep 19, 2026	n/a	2,042 contacts →
	Indirect evidence “A traditional general practice, with a twist.” Source: RevenueBase Database · checked Sep 19, 2026
5	AAB	Indirect evidence	Uk And Ireland, United KingdomHQ checked Sep 19, 2026	1,001-5,000	1,125 contacts →
	Indirect evidence “We provide services that help businesses at every stage of the lifecycle.” Source: RevenueBase Database · checked Sep 19, 2026
6	The Bonadio Group	Indirect evidence	Pittsford, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,083 contacts →
	Indirect evidence “Founded in 1978 and led by active and engaged problem solvers, The Bonadio Group (TBG) brings a unique passion and approach to our work.” Source: RevenueBase Database · checked Sep 19, 2026
7	H&r Block Canada	Partial evidence	Calgary, AB, CanadaHQ checked Sep 19, 2026	5,001-10,000	889 contacts →
	Partial evidence “We’re Canada’s leading tax preparation firm for over 60 years – delivering value to Canadians by our expertise and knowledge in handling all tax situations and by our commitment…” Source: RevenueBase Database · checked Sep 19, 2026
8	WTS Deutschland	Indirect evidence	München, GermanyHQ checked Sep 19, 2026	1,001-5,000	882 contacts →
	Indirect evidence “WTS ist ein globaler Full-Service Anbieter für Steuerberatungsleistungen und Financial & Deal Advisory.” Source: RevenueBase Database · checked Sep 19, 2026
9	DMA	Strong evidence	Fort Wayne, IN, United StatesHQ checked Sep 19, 2026	501-1,000	861 contacts →
	Strong evidence “Great Place to Work® Certified™ DMA, a proudly employee-owned company, has been solving corporate tax challenges for its clients since 1972.” Source: RevenueBase Database · checked Sep 19, 2026
10	Bonellierede	Indirect evidence	Milan, ItalyHQ checked Sep 19, 2026	501-1,000	819 contacts →
	Indirect evidence “BonelliErede è leader in Italia nei servizi legali e fiscali, attivo in tutti i settori del diritto commerciale e nel diritto penale d'impresa.” Source: RevenueBase Database · checked Sep 19, 2026
11	Deloitte Société D'avocats	Partial evidence	Paris La Défense, FranceHQ checked Sep 19, 2026	501-1,000	690 contacts →
	Partial evidence “Deloitte Société d'Avocats is one of the leading French law firms, specializing in international tax and legal strategies.” Source: RevenueBase Database · checked Sep 19, 2026
12	Chevez Ruiz Zamarripa	Indirect evidence	Ciudad De Mexico, MexicoHQ checked Sep 19, 2026	501-1,000	683 contacts →
	Indirect evidence “Chevez Ruiz Zamarripa, es una firma especializada en la Asesoría y Consultoría Fiscal de alto nivel, que se distingue por prestar servicios personalizados con total…” Source: RevenueBase Database · checked Sep 19, 2026
13	Kpmg Avocats	Indirect evidence	Courbevoie, FranceHQ checked Sep 19, 2026	501-1,000	669 contacts →
	Indirect evidence “Les entreprises de toutes tailles sont exposées à des dispositions de plus en plus complexes en matière de réglementations fiscales et juridiques sur leur territoire national et…” Source: RevenueBase Database · checked Sep 19, 2026
14	Flick Gocke Schaumburg	Partial evidence	Bonn, GermanyHQ checked Sep 19, 2026	501-1,000	651 contacts →
	Partial evidence “Flick Gocke Schaumburg is an independent partnership of lawyers, tax advisors and auditors working with more than 320 professionals from offices in Berlin, Bonn, Düsseldorf…” Source: RevenueBase Database · checked Sep 19, 2026
15	KUMAR	Indirect evidence	United StatesHQ checked Sep 19, 2026	1,001-5,000	627 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
16	Grupo Planning	Indirect evidence	Goiânia, BrazilHQ checked Sep 19, 2026	1,001-5,000	569 contacts →
	Indirect evidence “A Planning oferece soluções contábeis, tributárias, trabalhistas e financeiras para empresas que buscam mais eficiência, segurança e inteligência na gestão dos seus negócios.” Source: RevenueBase Database · checked Sep 19, 2026
17	Grupo Studio	Indirect evidence	Porto Alegre, BrazilHQ checked Sep 19, 2026	201-500	538 contacts →
	Indirect evidence “A Studio Fiscal é uma rede de franquia especializada na prestação de serviços de auditoria fiscal e planejamento tributário.” Source: RevenueBase Database · checked Sep 19, 2026
18	Sensiba LLP	Partial evidence	San Jose, CA, United StatesHQ checked Sep 19, 2026	501-1,000	493 contacts →
	Partial evidence “Sensiba’s comprehensive accounting, tax, and consulting services help businesses and people solve problems, navigate complexity, and build a foundation for sustainable growth.” Source: RevenueBase Database · checked Sep 19, 2026
19	Smith Howard	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 19, 2026	501-1,000	413 contacts →
	Partial evidence “Smith + Howard is a tax, accounting, advisory, and consulting firm headquartered in Atlanta, with a global presence.” Source: RevenueBase Database · checked Sep 19, 2026
20	Dhruva Advisors India Pvt. LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 19, 2026	501-1,000	408 contacts →
	Partial evidence “Dhruva Advisors, a Ryan LLC affiliate, delivers strategic tax and regulatory solutions to clients across India and around the world.” Source: RevenueBase Database · checked Sep 19, 2026
21	Apercen Partners LLC	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 19, 2026	201-500	399 contacts →
	Partial evidence “Originating from the English and Latin roots of “apercu,” an act of insight, and “census,” an applied study of wealth and property, Apercen is a tax consulting firm offering high…” Source: RevenueBase Database · checked Sep 19, 2026
22	Gravita	Indirect evidence	London, United KingdomHQ checked Sep 19, 2026	201-500	379 contacts →
	Indirect evidence “Welcome to the new era of accountancy.” Source: RevenueBase Database · checked Sep 19, 2026
23	Cohesive	Indirect evidence	Exton, PA, United StatesHQ checked Sep 19, 2026	501-1,000	364 contacts →
	Indirect evidence “Cohesive is a leading solutions provider and systems integrator for IBM Maximo.” Source: RevenueBase Database · checked Sep 19, 2026
24	Advantage ONE TAX Consulting	Partial evidence	Sterling, VA, United StatesHQ checked Sep 19, 2026	201-500	347 contacts →
	Partial evidence “Advantage One Tax Consulting is a multi-disciplinary group of highly experienced tax professionals who understand the tax practice in its true spirit, examine the issues it faces…” Source: RevenueBase Database · checked Sep 19, 2026
25	Guyer & Regules	Partial evidence	Montevideo, UruguayHQ checked Sep 19, 2026	201-500	337 contacts →
	Partial evidence “Guyer & Regules is proud to be considered as Uruguay’s first choice for international and domestic complex legal, accounting and tax work.” Source: RevenueBase Database · checked Sep 19, 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: corporate tax 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 corporate tax firms.
Partial evidence: Its own public description names part of corporate tax firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name corporate tax 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 31,448 corporate tax firms worldwide

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Corporate tax firms worldwide at a glance

As of Sep 19, 2026

25.4%Verified-email coverage

8.5Average contacts per company

1-10Median size (employees)

1.9%Largest-city concentration · Sao Paulo

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

20,452

11-50

8,991

51-200

1,355

201-500

162

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 corporate tax 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.
Coverage: Every country. Country and city lists for corporate tax firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “corporate tax 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 corporate tax 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 corporate tax firms, and records with no verified work email.
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, 67,525 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 19, 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.

Corporate tax firms by location

135 lists · largest first

Every Corporate tax firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 corporate tax 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 corporate tax firms are there worldwide?

RevenueBase identified 31,448 corporate tax firms worldwide 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?

H&r Block, headquartered in Kansas City, tops this list with the largest team on record.

Which country has the most corporate tax firms?

The United States leads with 9,114 companies, followed by Germany (3,677) and Brazil (2,795). Every corporate tax firms list by country and city is linked on this page.

Which city has the most corporate tax firms?

Sao Paulo leads with 613 headquartered companies, followed by London (274) and New York (243).

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 67,525 verified decision-maker contacts tracked across these 31,448 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 19, 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.