Company lists · Data refreshed September 2026

Top 25 Tax advisory firms worldwide

Name: Tax advisory firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 41,271 companies tracked

RevenueBase identified 41,271 tax advisory firms worldwide as of September 2026 and tracks 355,361 professional contacts across them, including 96,691 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers tax advisory 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 22, 2026. Country and city lists for tax advisory 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 22, 2026 86% judged on-target in blind review

41,271Companies

355,361Contacts tracked

96,691Verified emails

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The 25 largest tax advisory firms worldwide

Ranked by team size

Top 25 of 41,271 tax advisory firms worldwide, 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	CA Firm	Partial evidence	Chennai, IndiaHQ checked Sep 22, 2026	n/a	10,260 contacts →
	Partial evidence “The core business of our firm is to provide comprehensive package of accounting, secretarial, taxation and business advisory services to Corporate Clients.” Source: RevenueBase Database · checked Sep 22, 2026
2	Grant Thornton Ireland	Indirect evidence	Dublin, IrelandHQ checked Sep 22, 2026	1,001-5,000	2,374 contacts →
	Indirect evidence “In Ireland, Grant Thornton Ireland and Grant Thornton Corporate Finance Limited (and their respective subsidiary/affiliate entities) operate under an alternative practice…” Source: RevenueBase Database · checked Sep 22, 2026
3	BDO Germany	Strong evidence	Hamburg, GermanyHQ checked Sep 22, 2026	1,001-5,000	1,576 contacts →
	Strong evidence “BDO is the leading entrepreneurial driven provider for audit and audit-related services, tax and business law consulting as well as advisory services.” Source: RevenueBase Database · checked Sep 22, 2026
4	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
5	WIPRO	Indirect evidence	Valencia, SpainHQ checked Sep 22, 2026	n/a	1,097 contacts →
	Indirect evidence “En Wipro impulsamos el progreso.” Source: RevenueBase Database · checked Sep 22, 2026
6	Kpmg Czech Republic	Indirect evidence	Prague, Czech RepublicHQ checked Sep 22, 2026	1,001-5,000	858 contacts →
	Indirect evidence “Poskytujeme služby v oblasti auditu, daní, poradenství a práva.” Source: RevenueBase Database · checked Sep 22, 2026
7	Deloitte Société D'avocats	Partial evidence	Paris La Défense, FranceHQ checked Sep 22, 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 22, 2026
8	Flick Gocke Schaumburg	Strong evidence	Bonn, GermanyHQ checked Sep 22, 2026	501-1,000	651 contacts →
	Strong 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 22, 2026
9	KUMAR	Indirect evidence	United StatesHQ checked Sep 22, 2026	1,001-5,000	627 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
10	Heuking	Strong evidence	Düsseldorf, GermanyHQ checked Sep 22, 2026	1,001-5,000	620 contacts →
	Strong evidence “HEUKING is a partnership consisting of about 450 lawyers, tax advisors, and notaries.” Source: RevenueBase Database · checked Sep 22, 2026
11	BDO Luxembourg	Indirect evidence	LuxembourgHQ checked Sep 22, 2026	501-1,000	600 contacts →
	Indirect evidence “BDO Luxembourg is one of the largest firms of accountants, auditors and consultants in Luxembourg.” Source: RevenueBase Database · checked Sep 22, 2026
12	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
13	Bennett Thrasher	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 22, 2026	201-500	558 contacts →
	Strong evidence “Bennett Thrasher provides proven guidance for financial confidence through premier tax, audit, advisory, and outsourcing solutions.” Source: RevenueBase Database · checked Sep 22, 2026
14	H&r Block Australia	Partial evidence	Thornleigh, AustraliaHQ checked Sep 22, 2026	501-1,000	412 contacts →
	Partial evidence “As Australia’s largest preparer of personal income tax returns, with over 400 offices across Australia, expert help is never far away.” Source: RevenueBase Database · checked Sep 22, 2026
15	VLH	Indirect evidence	Neustadt An Der Weinstrasse, GermanyHQ checked Sep 22, 2026	1,001-5,000	373 contacts →
	Indirect evidence “Deutschlands Nr.” Source: RevenueBase Database · checked Sep 22, 2026
16	Transaction Square	Strong evidence	Mumbai, IndiaHQ checked Sep 22, 2026	201-500	274 contacts →
	Strong evidence “Transaction Square is a Tax, Regulatory and Business Advisory firm founded by entrepreneurial Big-4 Partners having collective advisory experience spanning over 3 decades.” Source: RevenueBase Database · checked Sep 22, 2026
17	Singhvi DEV & Unni Llp, Chartered Accountants	Indirect evidence	Bangalore, IndiaHQ checked Sep 22, 2026	201-500	273 contacts →
	Indirect evidence “Established in the year 1981, Singhvi Dev & Unni LLP, Chartered Accountants (SDU), is a professional services firm headquartered in Bengaluru, India and also operating from its…” Source: RevenueBase Database · checked Sep 22, 2026
18	Taxprime	Partial evidence	Jakarta Selatan, IndonesiaHQ checked Sep 22, 2026	201-500	269 contacts →
	Partial evidence “TaxPrime is a Tax Consulting Firm, based in Jakarta, the Capital City of Indonesia.” Source: RevenueBase Database · checked Sep 22, 2026
19	TPA Austria	Strong evidence	Vienna, AustriaHQ checked Sep 22, 2026	1,001-5,000	260 contacts →
	Strong evidence “TPA is one of the leading tax advisory and auditing services companies in Austria as well as in Central and South Eastern Europe.” Source: RevenueBase Database · checked Sep 22, 2026
20	FBC Farm And Small Business TAX Consultants	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 22, 2026	201-500	260 contacts →
	Indirect evidence “For more than 70 years, our focus has always been to bring financial peace of mind to our Canadian business owners.” Source: RevenueBase Database · checked Sep 22, 2026
21	Atoz TAX Advisers	Strong evidence	Senningerberg, LuxembourgHQ checked Sep 22, 2026	51-200	242 contacts →
	Strong evidence “We are a high-end independent advisory firm offering a comprehensive and integrated range of direct and indirect tax solutions, as well as corporate finance, transfer pricing and…” Source: RevenueBase Database · checked Sep 22, 2026
22	Atoz Services	Strong evidence	LuxembourgHQ checked Sep 22, 2026	n/a	234 contacts →
	Strong evidence “Our story begins in 2004 with the creation of the advisory firm ATOZ Tax Advisers.” Source: RevenueBase Database · checked Sep 22, 2026
23	Kpmg Acor TAX	Partial evidence	2900 Hellerup, DenmarkHQ checked Sep 22, 2026	201-500	232 contacts →
	Partial evidence “KPMG ACOR TAX is a full-service tax consultancy firm.” Source: RevenueBase Database · checked Sep 22, 2026
24	Möhrle Happ Luther	Strong evidence	Hamburg, GermanyHQ checked Sep 22, 2026	201-500	232 contacts →
	Strong evidence “MÖHRLE HAPP LUTHER is a multidisciplinary law firm in which auditors, tax advisors and attorneys work hand in hand.” Source: RevenueBase Database · checked Sep 22, 2026
25	DDTC	Partial evidence	Jakarta Utara, IndonesiaHQ checked Sep 22, 2026	51-200	231 contacts →
	Partial evidence “DDTC is a research, technology, and knowledge-based tax institution and a centre of several business activities units, consultation services (DDTC Consulting), a center for review…” 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 41,271 tax advisory firms worldwide

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Tax advisory firms worldwide at a glance

As of Sep 22, 2026

27.2%Verified-email coverage

8.6Average contacts per company

1-10Median size (employees)

1.6%Largest-city concentration · Sao Paulo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

26,357

11-50

12,015

51-200

1,915

201-500

274

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 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.
Coverage: Every country. Country and city lists for tax advisory firms are linked below.
What qualifies: Companies worldwide 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.
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, 96,691 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 location

154 lists · largest first

Every Tax advisory 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 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 worldwide?

RevenueBase identified 41,271 tax advisory 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?

CA Firm, headquartered in Chennai, tops this list with the largest team on record.

Which country has the most tax advisory firms?

The United States leads with 9,320 companies, followed by Germany (5,003) and Brazil (3,047). Every tax advisory firms list by country and city is linked on this page.

Which city has the most tax advisory firms?

Sao Paulo leads with 647 headquartered companies, followed by London (502) and Berlin (276).

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 96,691 verified decision-maker contacts tracked across these 41,271 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.