Company lists · Data refreshed September 2026

Top 25 Tax preparation outsourcing firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 16,067 companies tracked

RevenueBase identified 16,067 tax preparation outsourcing firms worldwide as of September 2026 and tracks 165,853 professional contacts across them, including 30,953 with verified work emails. The United States is the largest market and New York the largest hub.

This list covers tax preparation outsourcing 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 preparation outsourcing 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

16,067Companies

165,853Contacts tracked

30,953Verified emails

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The 25 largest tax preparation outsourcing firms worldwide

Ranked by team size

Top 25 of 16,067 tax preparation outsourcing 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 preparation outsourcing 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	H&r Block	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 29, 2026	10001+	59,451 contacts →
	Indirect evidence “H&R Block’s purpose is simple: To provide help and inspire confidence in our clients and communities everywhere.” Source: RevenueBase Database · checked Sep 29, 2026
2	Liberty TAX	Strong evidence	Hurst, TX, United StatesHQ checked Sep 29, 2026	n/a	6,260 contacts →
	Strong evidence “Liberty Tax is income tax preparation at its best: friendly, accurate, and with a money back guarantee.” Source: RevenueBase Database · checked Sep 29, 2026
3	RYAN	Partial evidence	Dallas, TX, United StatesHQ checked Sep 29, 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 29, 2026
4	TOA Global	Indirect evidence	Southport, AustraliaHQ checked Sep 29, 2026	1,001-5,000	3,912 contacts →
	Indirect evidence “Don’t wait until understaffing eats away at your productivity and client satisfaction.” Source: RevenueBase Database · checked Sep 29, 2026
5	Block Advisors	Indirect evidence	Kansas City, MO, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,379 contacts →
	Indirect evidence “We are Block Advisors by H&R Block.” Source: RevenueBase Database · checked Sep 29, 2026
6	D&v Philippines	Partial evidence	Makati, PhilippinesHQ checked Sep 29, 2026	1,001-5,000	1,021 contacts →
	Partial evidence “D&V Philippines is a finance and accounting outsourcing company that helps CFOs, accounting firms, audit firms, and other professional services firms build reliable offshore…” Source: RevenueBase Database · checked Sep 29, 2026
7	H&r Block Canada	Strong evidence	Calgary, AB, CanadaHQ checked Sep 29, 2026	5,001-10,000	889 contacts →
	Strong evidence “We’re Canada’s leading tax preparation firm for over 60 years – delivering value to Canadians by our expertise and knowledge in handling all tax situations and by our commitment…” Source: RevenueBase Database · checked Sep 29, 2026
8	KMK	Partial evidence	Ahmedabad, IndiaHQ checked Sep 29, 2026	1,001-5,000	628 contacts →
	Partial evidence “KMK Ventures is a leading Outsourced Accounting & Tax solutions company providing services to clients based out of USA.” Source: RevenueBase Database · checked Sep 29, 2026
9	Scrubbed.Net Global Services	Partial evidence	San Fernando, PhilippinesHQ checked Sep 29, 2026	1,001-5,000	617 contacts →
	Partial evidence “Scrubbed is an outsourced professional services firm providing a complete suite of accounting*, finance, and tax services, as well as support services for professional…” Source: RevenueBase Database · checked Sep 29, 2026
10	Drake Software	Partial evidence	Franklin, United StatesHQ checked Sep 29, 2026	501-1,000	561 contacts →
	Partial evidence “Drake Software, a private company founded in 1977, provides software solutions to over tax and accounting firms that file more than 40 million tax returns every year.” Source: RevenueBase Database · checked Sep 29, 2026
11	Outbooks	Partial evidence	Harrow, United KingdomHQ checked Sep 29, 2026	201-500	477 contacts →
	Partial evidence “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Source: RevenueBase Database · checked Sep 29, 2026
12	Global FPO	Strong evidence	Noida, IndiaHQ checked Sep 29, 2026	501-1,000	474 contacts →
	Strong evidence “Global FPO is an Accounting, Bookkeeping and Tax Consulting, and outsourcing company that helps CPAs, accounting firms, small and mid-sized businesses, and startups strengthen…” Source: RevenueBase Database · checked Sep 29, 2026
13	H&r Block Australia	Partial evidence	Thornleigh, AustraliaHQ checked Sep 29, 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 29, 2026
14	Apercen Partners LLC	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 29, 2026	201-500	399 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026
15	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
16	Advantage ONE TAX Consulting	Partial evidence	Sterling, VA, United StatesHQ checked Sep 29, 2026	201-500	347 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026
17	Unison Globus	Partial evidence	Coral Springs, FL, United StatesHQ checked Sep 29, 2026	201-500	320 contacts →
	Partial evidence “Unison Globus is a global accounting outsourcing and offshore staffing partner dedicated to supporting CPA firms and accounting professionals.” Source: RevenueBase Database · checked Sep 29, 2026
18	1-800accountant	Indirect evidence	New York, NY, United StatesHQ checked Sep 29, 2026	201-500	320 contacts →
	Indirect evidence “1-800Accoutant is America’s leading virtual accounting firm for small businesses.” Source: RevenueBase Database · checked Sep 29, 2026
19	GI Outsourcing	Partial evidence	London, United KingdomHQ checked Sep 29, 2026	201-500	311 contacts →
	Partial evidence “GI Outsourcing is a UK-based accountants outsourcing firm.” Source: RevenueBase Database · checked Sep 29, 2026
20	Grupo Conceito	Partial evidence	Lisbon, PortugalHQ checked Sep 29, 2026	201-500	303 contacts →
	Partial evidence “Fundada em junho de 1982, a Conceito dedica-se à prestação de serviços de outsourcing nas áreas de Contabilidade, Fiscalidade, Consultoria, Processamento Salarial, Tesouraria e…” Source: RevenueBase Database · checked Sep 29, 2026
21	Buchprufer Consultants LLP	Partial evidence	Calicut, IndiaHQ checked Sep 29, 2026	201-500	294 contacts →
	Partial evidence “Founded in 2007, Buchprufer Consultants has grown into a trusted and reputed outsourcing partner delivering high-quality financial and professional services.” Source: RevenueBase Database · checked Sep 29, 2026
22	Taxslayer	Partial evidence	Augusta, GA, IndiaHQ checked Sep 29, 2026	201-500	289 contacts →
	Partial evidence “For 60 years, TaxSlayer has been empowering Americans to take control of their taxes with easy-to-use, reliable software backed by U.S-based support.” Source: RevenueBase Database · checked Sep 29, 2026
23	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
24	Mayatax	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	501-1,000	269 contacts →
	Indirect evidence “Growth exposes financial weakness.” Source: RevenueBase Database · checked Sep 29, 2026
25	FBC Farm And Small Business TAX Consultants	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 29, 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 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 preparation outsourcing 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 preparation outsourcing firms.
Partial evidence: Its own public description names part of tax preparation outsourcing firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name tax preparation outsourcing 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 16,067 tax preparation outsourcing firms worldwide

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Tax preparation outsourcing firms worldwide at a glance

As of Sep 29, 2026

18.7%Verified-email coverage

10.3Average contacts per company

1-10Median size (employees)

1.2%Largest-city concentration · New York

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

11,564

11-50

3,556

51-200

556

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 preparation outsourcing 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 preparation outsourcing firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “tax preparation outsourcing 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 preparation outsourcing 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 preparation outsourcing 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, 30,953 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 preparation outsourcing firms by location

59 lists · largest first

Every Tax preparation outsourcing 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 preparation outsourcing 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 preparation outsourcing firms are there worldwide?

RevenueBase identified 16,067 tax preparation outsourcing 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?

H&r Block, headquartered in Kansas City, tops this list with the largest team on record.

Which country has the most tax preparation outsourcing firms?

The United States leads with 7,633 companies, followed by Germany (1,357) and India (846). Every tax preparation outsourcing firms list by country and city is linked on this page.

Which city has the most tax preparation outsourcing firms?

New York leads with 186 headquartered companies, followed by Houston (168) and Sao Paulo (154).

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 30,953 verified decision-maker contacts tracked across these 16,067 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.