Company lists · Data refreshed September 2026

Top 25 Tax research and planning firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 22, 2026 23,773 companies tracked

RevenueBase identified 23,773 company matches for tax research and planning firms worldwide as of September 2026 and tracks 194,414 professional contacts across them, including 49,566 with verified work emails. The United States is the largest market and Sao Paulo the largest hub.

This list covers company matches for tax research and planning firms 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 September 22, 2026. Country and city lists for tax research and planning firms 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 Sep 22, 2026 How this list was built

23,773Companies

194,414Contacts tracked

49,566Verified emails

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The 25 largest tax research and planning firms worldwide

Ranked by team size

Top 25 of 23,773 company matches for tax research and planning firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 22, 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 Sep 22, 2026	10001+	59,451 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 · Sep 22, 2026 · View company records in RevenueBase
2	RYAN	Exact match	Dallas, TX, United StatesHQ recorded Sep 22, 2026	5,001-10,000	6,089 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 · Sep 22, 2026 · View company records in RevenueBase
3	TAX Consultant	Exact match	Brighton, United KingdomHQ recorded Sep 22, 2026	n/a	2,042 contacts →
	Exact match “A traditional general practice, with a twist.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
4	PKF O'connor Davies	Exact match	Harrison, NY, United StatesHQ recorded Sep 22, 2026	1,001-5,000	1,730 contacts →
	Exact match “PKF O’Connor Davies is a top-tier accounting, tax and advisory practice with a long history of serving domestic and international clients.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
5	Bloomberg BNA	Exact match	Arlington, VA, United StatesHQ recorded Sep 22, 2026	1,001-5,000	961 contacts →
	Exact match “Bloomberg BNA is now Bloomberg Industry Group.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
6	WTS Deutschland	Exact match	München, GermanyHQ recorded Sep 22, 2026	1,001-5,000	882 contacts →
	Exact match “WTS ist ein globaler Full-Service Anbieter für Steuerberatungsleistungen und Financial & Deal Advisory.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
7	DMA	Exact match	Fort Wayne, IN, United StatesHQ recorded Sep 22, 2026	501-1,000	861 contacts →
	Exact match “Great Place to Work® Certified™ DMA, a proudly employee-owned company, has been solving corporate tax challenges for its clients since 1972.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
8	Chevez Ruiz Zamarripa	Exact match	Ciudad De Mexico, MexicoHQ recorded Sep 22, 2026	501-1,000	683 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
9	Sensiba LLP	Exact match	San Jose, CA, United StatesHQ recorded Sep 22, 2026	501-1,000	493 contacts →
	Exact match “Sensiba’s comprehensive accounting, tax, and consulting services help businesses and people solve problems, navigate complexity, and build a foundation for sustainable growth.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
10	Smith Howard	Exact match	Atlanta, GA, United StatesHQ recorded Sep 22, 2026	501-1,000	413 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 · Sep 22, 2026 · View company records in RevenueBase
11	Apercen Partners LLC	Exact match	Palo Alto, CA, United StatesHQ recorded Sep 22, 2026	201-500	399 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
12	Cohesive	Exact match	Exton, PA, United StatesHQ recorded Sep 22, 2026	501-1,000	364 contacts →
	Exact match “Cohesive is a leading solutions provider and systems integrator for IBM Maximo.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
13	Advantage ONE TAX Consulting	Exact match	Sterling, VA, United StatesHQ recorded Sep 22, 2026	201-500	347 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 · Sep 22, 2026 · View company records in RevenueBase
14	Felix Advisory Private Limited	Exact match	Gurgaon, IndiaHQ recorded Sep 22, 2026	201-500	331 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 · Sep 22, 2026 · View company records in RevenueBase
15	Ecovis Deutschland	Exact match	Berlin, GermanyHQ recorded Sep 22, 2026	1,001-5,000	319 contacts →
	Exact match “Wir bei Ecovis sind Steuerberater, Wirtschaftsprüfer, Rechtsanwälte und Unternehmensberater.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
16	Squire	Exact match	Orem, UT, United StatesHQ recorded Sep 22, 2026	201-500	297 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 · Sep 22, 2026 · View company records in RevenueBase
17	GTM Global TAX Management	Exact match	Wayne, PA, United StatesHQ recorded Sep 22, 2026	201-500	281 contacts →
	Exact match “GTM is a leading provider of corporate tax services.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
18	Taxprime	Exact match	Jakarta Selatan, IndonesiaHQ recorded Sep 22, 2026	201-500	269 contacts →
	Exact match “TaxPrime is a Tax Consulting Firm, based in Jakarta, the Capital City of Indonesia.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
19	Mayatax	Exact match	Houston, TX, United StatesHQ recorded Sep 22, 2026	501-1,000	269 contacts →
	Exact match “Growth exposes financial weakness.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
20	FBC Farm And Small Business TAX Consultants	Exact match	Calgary, AB, CanadaHQ recorded Sep 22, 2026	201-500	260 contacts →
	Exact match “For more than 70 years, our focus has always been to bring financial peace of mind to our Canadian business owners.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
21	Garrido Licona Y Asociados S.C	Exact match	México, MexicoHQ recorded Sep 22, 2026	201-500	233 contacts →
	Exact match “Nuestra misión es brindar asesoría fiscal, legal, financiera y de negocios a empresas nacionales e internacionales y nos caracterizamos por lograr “Resultados Óptimos” y brindar…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
22	Kpmg Acor TAX	Exact match	2900 Hellerup, DenmarkHQ recorded Sep 22, 2026	201-500	232 contacts →
	Exact match “KPMG ACOR TAX is a full-service tax consultancy firm.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
23	DDTC	Exact match	Jakarta Utara, IndonesiaHQ recorded Sep 22, 2026	51-200	231 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
24	KE Andrews	Exact match	Dallas, TX, United StatesHQ recorded Sep 22, 2026	201-500	224 contacts →
	Exact match “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.” Recorded in the RevenueBase company graph · Sep 22, 2026 · View company records in RevenueBase
25	TAX Consulting South Africa	Exact match	Bryanston, South AfricaHQ recorded Sep 22, 2026	51-200	209 contacts →
	Exact match “Tax advisory and compliance in South Africa is our niche expertise.” Recorded in the RevenueBase company graph · Sep 22, 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 research and planning firms”. 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 23,773 tax research and planning firms worldwide

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Tax research and planning firms worldwide at a glance

As of Sep 22, 2026

25.5%Verified-email coverage

8.2Average contacts per company

1-10Median size (employees)

1.3%Largest-city concentration · Sao Paulo

Sep 22, 2026Page data refreshed

Companies by employee count

1-10

15,905

11-50

6,390

51-200

957

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

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 research and planning firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “tax research and planning firms” 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 49,566 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 September 22, 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 research and planning firms by location

86 lists · largest first

Every Tax research and planning 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 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 research and planning firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many tax research and planning firms are there worldwide?

RevenueBase identified 23,773 company matches for tax research and planning firms worldwide as of September 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 research and planning firms?

The United States leads with 8,895 companies, followed by Germany (3,604) and Brazil (1,390). Every tax research and planning firms list by country and city is linked on this page.

Which city has the most tax research and planning firms?

Sao Paulo leads with 308 company records, followed by New York (216) and Berlin (204).

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 49,566 professional contacts with verified work emails tracked across these 23,773 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 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 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.