Company lists · Data refreshed September 2026

Top 25 Tax dispute resolution firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 2,942 companies tracked

RevenueBase identified 2,942 tax dispute resolution firms worldwide as of September 2026 and tracks 22,093 professional contacts across them, including 8,301 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers tax dispute resolution 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 dispute resolution 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

2,942Companies

22,093Contacts tracked

8,301Verified emails

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The 25 largest tax dispute resolution firms worldwide

Ranked by team size

Top 25 of 2,942 tax dispute resolution 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 dispute resolution 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	RYAN	Partial evidence	Dallas, TX, United StatesHQ checked Sep 22, 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 22, 2026
2	Chevez Ruiz Zamarripa	Indirect evidence	Ciudad De Mexico, MexicoHQ checked Sep 22, 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 22, 2026
3	Optima TAX Relief	Indirect evidence	Santa Ana, CA, United StatesHQ checked Sep 22, 2026	501-1,000	407 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 22, 2026
4	Cohesive	Indirect evidence	Exton, PA, United StatesHQ checked Sep 22, 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 22, 2026
5	TAX Relief Advocates	Partial evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	1,001-5,000	297 contacts →
	Partial evidence “We help people with tax debt, wage garnishments, bank levies, audits and much more.” Source: RevenueBase Database · checked Sep 22, 2026
6	KE Andrews	Partial evidence	Dallas, TX, United StatesHQ checked Sep 22, 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 22, 2026
7	Community Tax, LLC	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 22, 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 22, 2026
8	Alleviate TAX	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 22, 2026	201-500	138 contacts →
	Indirect evidence “We care about people.” Source: RevenueBase Database · checked Sep 22, 2026
9	TAX Defense Network, LLC	Partial evidence	Jacksonville, FL, United StatesHQ checked Sep 22, 2026	201-500	134 contacts →
	Partial evidence “Since 2007, Tax Defense Network's team of licensed tax professionals has helped hundreds of thousands of taxpayers and small business owners resolve their IRS issues, including…” Source: RevenueBase Database · checked Sep 22, 2026
10	Omni TAX Solutions	Strong evidence	Broomfield, CO, United StatesHQ checked Sep 22, 2026	51-200	131 contacts →
	Strong evidence “Your tax debt resolution partner.” Source: RevenueBase Database · checked Sep 22, 2026
11	Taxaudit	Indirect evidence	Folsom, CA, United StatesHQ checked Sep 22, 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 22, 2026
12	Anthem TAX Services	Strong evidence	Los Angeles, CA, United StatesHQ checked Sep 22, 2026	51-200	124 contacts →
	Strong 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 22, 2026
13	KBL Accounting	Indirect evidence	Goiania, BrazilHQ checked Sep 22, 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 22, 2026
14	Protection Plus	Strong evidence	Winston Salem, NC, United StatesHQ checked Sep 22, 2026	51-200	110 contacts →
	Strong evidence “Protection Plus provides top-tier tax resolution services, offering up to in services to resolve IRS notices, inquiries, and audits.” Source: RevenueBase Database · checked Sep 22, 2026
15	20 20 TAX Resolution	Strong evidence	Broomfield, CO, United StatesHQ checked Sep 22, 2026	51-200	91 contacts →
	Strong evidence “Over the past 28 years, 20/20 Tax Resolution has helped over businesses and individuals reach successful resolutions with their IRS and state tax liabilities.” Source: RevenueBase Database · checked Sep 22, 2026
16	Ryan LAW Firm, Pllc	Indirect evidence	Plano, TX, United StatesHQ checked Sep 22, 2026	51-200	88 contacts →
	Indirect evidence “Ryan Law is headquartered in Plano, Texas, with offices across the United States and Canada.” Source: RevenueBase Database · checked Sep 22, 2026
17	R&g Brenner TAX Accounting	Partial evidence	Valley Stream, NY, United StatesHQ checked Sep 22, 2026	51-200	78 contacts →
	Partial evidence “Tax Consulting Services Individual Tax Return Preparation * Electronic Filing * Refund Anticipation Loans * Same Day Refund Anticipation Loans * Refund Anticipation Checks * State…” Source: RevenueBase Database · checked Sep 22, 2026
18	Polston TAX	Strong evidence	Norman, OK, United StatesHQ checked Sep 22, 2026	51-200	76 contacts →
	Strong evidence “We are one of the largest tax resolution law firms in the nation.” Source: RevenueBase Database · checked Sep 22, 2026
19	Neil Jesani Advisors, INC	Strong evidence	Sunrise, FL, United StatesHQ checked Sep 22, 2026	51-200	70 contacts →
	Strong evidence “Neil Jesani Tax Advisors, Inc.(NJA) provides a full suite of tax, compliance, accounting, resolution and advisory services, drawing on extensive industry knowledge to serve high…” Source: RevenueBase Database · checked Sep 22, 2026
20	Idealtax	Partial evidence	Costa Mesa, CA, United StatesHQ checked Sep 22, 2026	51-200	69 contacts →
	Partial evidence “Ideal Tax Solution (ITS) was established with the ideal of helping clients who are suffering through a tax debt issue, easing the stress and anxiety that comes with serious tax…” Source: RevenueBase Database · checked Sep 22, 2026
21	Contclaro	Indirect evidence	Sao Paulo, BrazilHQ checked Sep 22, 2026	51-200	68 contacts →
	Indirect evidence “Reduza sua carga tributária e seu passivo fiscal.” Source: RevenueBase Database · checked Sep 22, 2026
22	Aurtus Consulting LLP	Partial evidence	Mumbai, IndiaHQ checked Sep 22, 2026	11-50	65 contacts →
	Partial evidence “Aurtus is a full-service tax, transaction and regulatory advisory firm that provides practical, well-researched solutions to complex tax, transaction, and regulatory challenges…” Source: RevenueBase Database · checked Sep 22, 2026
23	Priority TAX Relief	Strong evidence	Spokane, WA, United StatesHQ checked Sep 22, 2026	201-500	64 contacts →
	Strong evidence “Protecting Finances Leading Tax Debt Relief Experts \| IRS & State Resolution Specialists Settle Tax Debt & Regain Stability We help individuals and businesses navigate complex tax…” Source: RevenueBase Database · checked Sep 22, 2026
24	Omni TAX Help	Partial evidence	Vero Beach, FL, United StatesHQ checked Sep 22, 2026	51-200	62 contacts →
	Partial evidence “At Omni Tax Help, we provide expert, personalized solutions to resolve tax challenges for individuals and businesses nationwide.” Source: RevenueBase Database · checked Sep 22, 2026
25	Fischer Y CIA	Indirect evidence	Santiago, ChileHQ checked Sep 22, 2026	51-200	59 contacts →
	Indirect evidence “Somos un estudio moderno y eficiente, con reconocido liderazgo nacional e internacional en la práctica tributaria y de negocios.” 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 dispute resolution 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 dispute resolution firms.
Partial evidence: Its own public description names part of tax dispute resolution firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name tax dispute resolution 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 2,942 tax dispute resolution firms worldwide

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Tax dispute resolution firms worldwide at a glance

As of Sep 22, 2026

37.6%Verified-email coverage

7.5Average contacts per company

1-10Median size (employees)

2.0%Largest-city concentration · Sao Paulo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

2,037

11-50

723

51-200

115

201-500

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 dispute resolution 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 dispute resolution firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “tax dispute resolution 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 dispute resolution 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 dispute resolution 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, 8,301 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 dispute resolution firms by location

14 lists · largest first

Every Tax dispute resolution 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 dispute resolution 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 dispute resolution firms are there worldwide?

RevenueBase identified 2,942 tax dispute resolution 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?

RYAN, headquartered in Dallas, tops this list with the largest team on record.

Which country has the most tax dispute resolution firms?

The United States leads with 1,350 companies, followed by Brazil (212) and Germany (178). Every tax dispute resolution firms list by country and city is linked on this page.

Which city has the most tax dispute resolution firms?

Sao Paulo leads with 58 headquartered companies, followed by Houston (47) and Los Angeles (37).

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 8,301 verified decision-maker contacts tracked across these 2,942 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.