Company lists · Data refreshed November 2026

Top 25 Tax audit support services worldwide

Name: Tax audit support services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 22,865 companies tracked

RevenueBase identified 22,865 company matches for tax audit support services worldwide as of November 2026 and tracks 227,591 professional contacts across them, including 52,383 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for tax audit support services worldwide, 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 November 6, 2026. Country and city lists for tax audit support services follow the table.

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 Nov 6, 2026 How this list was built

22,865Companies

227,591Contacts tracked

52,383Verified emails

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The 25 largest tax audit support services worldwide

Ranked by team size

Top 25 of 22,865 company matches for tax audit support services worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	H&r Block	Exact match	Kansas City, MO, United StatesHQ recorded Nov 6, 2026	10001+	64,430 contacts →
	Exact match “H&R Block’s purpose is simple: To provide help and inspire confidence in our clients and communities everywhere.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	CA Firm	Exact match	Chennai, IndiaHQ recorded Nov 6, 2026	n/a	10,802 contacts →
	Exact match “The core business of our firm is to provide comprehensive package of accounting, secretarial, taxation and business advisory services to Corporate Clients.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	RYAN	Exact match	Dallas, CT, United StatesHQ recorded Nov 6, 2026	5,001-10,000	6,580 contacts →
	Exact match “Ryan, an award-winning global tax services and software provider, is the largest Firm in the world dedicated exclusively to business taxes.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	TAX Consultant	Exact match	Brighton, United KingdomHQ recorded Nov 6, 2026	n/a	2,211 contacts →
	Exact match “A traditional general practice, with a twist.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	BDO Brazil	Exact match	Sp, BrazilHQ recorded Nov 6, 2026	1,001-5,000	1,994 contacts →
	Exact match “Presidida por Raul Corrêa da Silva, a BDO RCS foi fundada em 2001 e desde então mantém participação expressiva no mercado de auditorias.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	BDO In Indonesia	Exact match	Jakarta, IndonesiaHQ recorded Nov 6, 2026	501-1,000	1,729 contacts →
	Exact match “BDO is the leading provider of professional services within the mid-tier of our profession.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Grant Thornton Sweden	Exact match	Stockholm, SwedenHQ recorded Nov 6, 2026	1,001-5,000	1,726 contacts →
	Exact match “Grant Thornton är ett ledande revisions- och rådgivningsföretag med över 1400 medarbetare som erbjuder tjänster inom revision, skatt, redovisning och specialistrådgivning.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	RSM Ebner Stolz	Exact match	Stuttgart, GermanyHQ recorded Nov 6, 2026	1,001-5,000	1,599 contacts →
	Exact match “Wollen Sie jemanden, der Sie auch beim Sprung in neue Märkte und bei allen anstehenden Herausforderungen begleitet?” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	KMK	Exact match	Ahmedabad, IndiaHQ recorded Nov 6, 2026	1,001-5,000	829 contacts →
	Exact match “KMK Ventures is a leading Outsourced Accounting & Tax solutions company providing services to clients based out of USA.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Grupo Studio	Exact match	Porto Alegre, BrazilHQ recorded Nov 6, 2026	201-500	647 contacts →
	Exact match “A Studio Fiscal é uma rede de franquia especializada na prestação de serviços de auditoria fiscal e planejamento tributário.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	KUMAR	Exact match	n/a	1,001-5,000	638 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	BDO Austria	Exact match	Vienna, AustriaHQ recorded Nov 6, 2026	1,001-5,000	628 contacts →
	Exact match “Holen Sie sich eine Datenschutzzertifizierung für Ihr Unternehmen.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Dean Dorton	Exact match	Lexington, KY, United StatesHQ recorded Nov 6, 2026	501-1,000	619 contacts →
	Exact match “Dean Dorton provides an integrated suite of audit, tax, business management, consulting, and technology solutions.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	Lisicki Litvin & Asociados	Exact match	Buenos Aires, ArgentinaHQ recorded Nov 6, 2026	501-1,000	587 contacts →
	Exact match “Somos una firma de profesionales altamente especializados y comprometidos con las necesidades de nuestros clientes.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	BDO Sverige	Exact match	Stockholm, SwedenHQ recorded Nov 6, 2026	501-1,000	527 contacts →
	Exact match “BDO – en global byrå med nöjdast kunder i revisionsbranschen BDO är en revisions- och rådgivningsbyrå som finns med dig hela vägen.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	Brown Edwards	Exact match	Roanoke, VA, United StatesHQ recorded Nov 6, 2026	201-500	517 contacts →
	Exact match “Providing Professional Business Advisory and Consulting Services including tax, accounting and IT services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Smith Howard	Exact match	Atlanta, GA, United StatesHQ recorded Nov 6, 2026	501-1,000	505 contacts →
	Exact match “Smith + Howard is a tax, accounting, advisory, and consulting firm headquartered in Atlanta, with a global presence.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	DHPG	Exact match	Bonn, GermanyHQ recorded Nov 6, 2026	1,001-5,000	497 contacts →
	Exact match “As an interdisciplinary medium-sized tax audit, accountancy and legal advice service we guarantee all-round high-quality consultation combined with a personal component.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	H&r Block Australia	Exact match	Thornleigh, AustraliaHQ recorded Nov 6, 2026	501-1,000	463 contacts →
	Exact match “As Australia’s largest preparer of personal income tax returns, with over 400 offices across Australia, expert help is never far away.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Cohesive	Exact match	Exton, GA, United StatesHQ recorded Nov 6, 2026	501-1,000	386 contacts →
	Exact match “Cohesive is a leading solutions provider and systems integrator for IBM Maximo.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Sadec Akelys	Exact match	Paris, FranceHQ recorded Nov 6, 2026	501-1,000	384 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Advantage ONE TAX Consulting	Exact match	Sterling, VA, United StatesHQ recorded Nov 6, 2026	201-500	360 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Ecovis Deutschland	Exact match	Berlin, GermanyHQ recorded Nov 6, 2026	1,001-5,000	351 contacts →
	Exact match “Wir bei Ecovis sind Steuerberater, Wirtschaftsprüfer, Rechtsanwälte und Unternehmensberater.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Squire	Exact match	Orem, UT, United StatesHQ recorded Nov 6, 2026	201-500	337 contacts →
	Exact match “Squire is a nationally recognized audit, tax, and business advisory firm serving clients across the U.S.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Felix Advisory Private Limited	Exact match	Gurgaon, IndiaHQ recorded Nov 6, 2026	201-500	320 contacts →
	Exact match “Felix Advisory is one of the leading providers of tax & regulatory services, risk, transaction, financial & business advisory, internal audit, and corporate governance services in…” Recorded in the RevenueBase company graph · Nov 6, 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 “tax audit support services”. 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 22,865 tax audit support services worldwide

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Tax audit support services worldwide at a glance

As of Nov 6, 2026

23.0%Verified-email coverage

10.0Average contacts per company

1-10Median size (employees)

1.5%Largest-city concentration · Sao Paulo

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

14,672

11-50

6,268

51-200

966

201-500

136

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

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.
Coverage: Every country. Country and city lists for tax audit support services are linked below.
What qualifies: Company records worldwide whose business descriptions match “tax audit support services” 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. 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 52,383 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 November 6, 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.

Tax audit support services by location

101 lists · largest first

Every Tax audit support services 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 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 “tax audit support services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many tax audit support services are there worldwide?

RevenueBase identified 22,865 company matches for tax audit support services worldwide as of November 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?

H&r Block tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most tax audit support services?

The United States leads with 5,589 companies, followed by Germany (3,035) and Brazil (1,736). Every tax audit support services list by country and city is linked on this page.

Which city has the most tax audit support services?

Sao Paulo leads with 342 company records, followed by Berlin (170) and Dubai (154).

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 52,383 professional contacts with verified work emails tracked across these 22,865 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 November 6, 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.