Company lists · Data refreshed September 2026

Top 25 Tax controversy law firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 6,373 companies tracked

RevenueBase identified 6,373 tax controversy law firms worldwide as of September 2026 and tracks 39,777 professional contacts across them, including 12,532 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers tax controversy law 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 29, 2026. Country and city lists for tax controversy law 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 29, 2026 86% judged on-target in blind review

6,373Companies

39,777Contacts tracked

12,532Verified emails

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The 25 largest tax controversy law firms worldwide

Ranked by team size

Top 25 of 6,373 tax controversy law firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to tax controversy law 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	EY Société D'avocats	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	501-1,000	735 contacts →
	Indirect evidence “EY Société d’avocats se mobilise pour concrétiser les potentiels: c’est ainsi que nous faisons la différence pour nos clients, nos équipes et tous nos interlocuteurs.” Source: RevenueBase Database · checked Sep 29, 2026
2	Deloitte Société D'avocats	Strong evidence	Paris La Défense, FranceHQ checked Sep 29, 2026	501-1,000	690 contacts →
	Strong 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 29, 2026
3	Chevez Ruiz Zamarripa	Indirect evidence	Ciudad De Mexico, MexicoHQ checked Sep 29, 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 29, 2026
4	Kpmg Avocats	Indirect evidence	Courbevoie, FranceHQ checked Sep 29, 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 29, 2026
5	Dhruva Advisors India Pvt. LTD	Partial evidence	Mumbai, IndiaHQ checked Sep 29, 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 29, 2026
6	Cohesive	Indirect evidence	Exton, PA, United StatesHQ checked Sep 29, 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 29, 2026
7	Guyer & Regules	Partial evidence	Montevideo, UruguayHQ checked Sep 29, 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 29, 2026
8	Poellath	Strong evidence	Berlin, GermanyHQ checked Sep 29, 2026	201-500	279 contacts →
	Strong evidence “POELLATH is a leading German law firm with an international reach, specializing in business and tax law.” Source: RevenueBase Database · checked Sep 29, 2026
9	Taxprime	Partial evidence	Jakarta Selatan, IndonesiaHQ checked Sep 29, 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 29, 2026
10	Roth&co	Indirect evidence	Lakewood, NJ, IsraelHQ checked Sep 29, 2026	201-500	225 contacts →
	Indirect evidence “Roth & Co is a top-150 U.S.” Source: RevenueBase Database · checked Sep 29, 2026
11	KE Andrews	Partial evidence	Dallas, TX, United StatesHQ checked Sep 29, 2026	201-500	224 contacts →
	Partial evidence “In operation since 1978, KE Andrews is one of the largest state and local tax firms in the country, managing over $500 billion in assets.” Source: RevenueBase Database · checked Sep 29, 2026
12	Sacha Calmon	Indirect evidence	Belo Horizonte, BrazilHQ checked Sep 29, 2026	51-200	213 contacts →
	Indirect evidence “Fundado em 17 de agosto de 1994, o Sacha Calmon – Misabel Derzi Consultores e Advogados (SCMD) é referência nacional em Direito Tributário.” Source: RevenueBase Database · checked Sep 29, 2026
13	Arsene Taxand	Indirect evidence	Paris, FranceHQ checked Sep 29, 2026	51-200	198 contacts →
	Indirect evidence “Created in 2004, ARSENE TAXAND offers a cutting edge service in all the firm’s main areas of activity.” Source: RevenueBase Database · checked Sep 29, 2026
14	ADS Allgemeine Deutsche Steuerberatungsgesellschaft MBH	Indirect evidence	Hamburg, GermanyHQ checked Sep 29, 2026	501-1,000	198 contacts →
	Indirect evidence “Die ADS Steuer.Beratung ist Ihr spezialisierter Partner für ganzheitliche Steuerberatung – exklusiv für Unternehmen.” Source: RevenueBase Database · checked Sep 29, 2026
15	EY Private Client Services	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	10001+	177 contacts →
	Partial evidence “Thoughtfully structuring and managing your tax affairs is more important than ever.” Source: RevenueBase Database · checked Sep 29, 2026
16	Community Tax, LLC	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 29, 2026	201-500	175 contacts →
	Partial evidence “Since 2010, Community Tax has helped individuals and businesses across the United States navigate complex tax matters with clarity and confidence.” Source: RevenueBase Database · checked Sep 29, 2026
17	Vischer	Strong evidence	Zurich, SwitzerlandHQ checked Sep 29, 2026	201-500	175 contacts →
	Strong evidence “VISCHER is a leading Swiss law firm offering integrated legal and tax expertise.” Source: RevenueBase Database · checked Sep 29, 2026
18	Zuckerman Spaeder LLP	Indirect evidence	Washington, DC, United StatesHQ checked Sep 29, 2026	51-200	155 contacts →
	Indirect evidence “Zuckerman Spaeder LLP is consistently recognized as a leading national litigation boutique.” Source: RevenueBase Database · checked Sep 29, 2026
19	Certacon	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 29, 2026	51-200	145 contacts →
	Indirect evidence “A Certacon nasceu da união de profissionais altamente experientes aliado aos melhores e mais completos softwares do mercado, com o propósito de prestar serviços nas áreas…” Source: RevenueBase Database · checked Sep 29, 2026
20	Soluzione Tasse	Indirect evidence	Milano, ItalyHQ checked Sep 29, 2026	201-500	139 contacts →
	Indirect evidence “Soluzione Tasse è una società specializzata in pianificazione fiscale e protezione del patrimonio che si avvale di team di 35 professionisti, tra cui dottori commercialisti…” Source: RevenueBase Database · checked Sep 29, 2026
21	Omni TAX Solutions	Partial evidence	Broomfield, CO, United StatesHQ checked Sep 29, 2026	51-200	131 contacts →
	Partial evidence “Your tax debt resolution partner.” Source: RevenueBase Database · checked Sep 29, 2026
22	Taxaudit	Indirect evidence	Folsom, CA, United StatesHQ checked Sep 29, 2026	201-500	130 contacts →
	Indirect evidence “TaxAudit.com is brought to you by the audit experts at TaxResources, Inc.” Source: RevenueBase Database · checked Sep 29, 2026
23	Anthem TAX Services	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 29, 2026	51-200	124 contacts →
	Partial evidence “Anthem Tax Services (ATS) is one of the highest rated Tax Resolution Companies in the U.S, comprised of professionals who are passionate about representing taxpayers and fighting…” Source: RevenueBase Database · checked Sep 29, 2026
24	KBL Accounting	Indirect evidence	Goiania, BrazilHQ checked Sep 29, 2026	51-200	121 contacts →
	Indirect evidence “A KBL Accounting foi fundada em 2007, oferecendo soluções nas áreas de contabilidade empresarial e assessoria jurídica tributária.Atualmente, atendemos clientes do segmento…” Source: RevenueBase Database · checked Sep 29, 2026
25	Lavine, Lofgren, Morris & Engelberg, LLP	Indirect evidence	La Jolla, CA, United StatesHQ checked Sep 29, 2026	51-200	118 contacts →
	Indirect evidence “Since 1985, we’ve built a firm where clients receive the highest quality of services, where our people play an important role as they grow professionally and where we as a firm…” Source: RevenueBase Database · checked Sep 29, 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 controversy law 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 controversy law firms.
Partial evidence: Its own public description names part of tax controversy law firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name tax controversy law 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 6,373 tax controversy law firms worldwide

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Tax controversy law firms worldwide at a glance

As of Sep 29, 2026

31.5%Verified-email coverage

6.2Average contacts per company

1-10Median size (employees)

3.6%Largest-city concentration · Sao Paulo

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

4,162

11-50

1,828

51-200

269

201-500

501-1,000

1,001-5,000

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 controversy law 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 controversy law firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “tax controversy law 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 controversy law 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 controversy law 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, 12,532 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 29, 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 controversy law firms by location

40 lists · largest first

Every Tax controversy law 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 controversy law 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 controversy law firms are there worldwide?

RevenueBase identified 6,373 tax controversy law 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?

EY Société D'avocats, headquartered in Paris, tops this list with the largest team on record.

Which country has the most tax controversy law firms?

The United States leads with 1,672 companies, followed by Brazil (952) and Germany (875). Every tax controversy law firms list by country and city is linked on this page.

Which city has the most tax controversy law firms?

Sao Paulo leads with 232 headquartered companies, followed by Paris (100) and Porto Alegre (76).

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 12,532 verified decision-maker contacts tracked across these 6,373 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 29, 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.