Company lists · Data refreshed September 2026

Top 25 Tax preparation outsourcing services worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 12,873 companies tracked

RevenueBase identified 12,873 company matches for tax preparation outsourcing services worldwide as of September 2026 and tracks 136,969 professional contacts across them, including 25,391 with verified work emails. The United States is the largest market and New York the largest hub.

This list covers company matches for tax preparation outsourcing 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 September 29, 2026. Country and city lists for tax preparation outsourcing 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 Sep 29, 2026 How this list was built

12,873Companies

136,969Contacts tracked

25,391Verified emails

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The 25 largest tax preparation outsourcing services worldwide

Ranked by team size

Top 25 of 12,873 company matches for tax preparation outsourcing services worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 29, 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 29, 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 29, 2026 · View company records in RevenueBase
2	RYAN	Exact match	Dallas, TX, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
3	Block Advisors	Exact match	Kansas City, MO, United StatesHQ recorded Sep 29, 2026	1,001-5,000	1,379 contacts →
	Exact match “We are Block Advisors by H&R Block.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
4	D&v Philippines	Exact match	Makati, PhilippinesHQ recorded Sep 29, 2026	1,001-5,000	1,021 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
5	H&r Block Canada	Exact match	Calgary, AB, CanadaHQ recorded Sep 29, 2026	5,001-10,000	889 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
6	KMK	Exact match	Ahmedabad, IndiaHQ recorded Sep 29, 2026	1,001-5,000	628 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 · Sep 29, 2026 · View company records in RevenueBase
7	Outbooks	Exact match	Harrow, United KingdomHQ recorded Sep 29, 2026	201-500	477 contacts →
	Exact match “Outbooks is a leading provider of outsourcing services to accounting and bookkeeping firms.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
8	Global FPO	Exact match	Noida, IndiaHQ recorded Sep 29, 2026	501-1,000	474 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
9	H&r Block Australia	Exact match	Thornleigh, AustraliaHQ recorded Sep 29, 2026	501-1,000	412 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 · Sep 29, 2026 · View company records in RevenueBase
10	Cohesive	Exact match	Exton, PA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
11	Advantage ONE TAX Consulting	Exact match	Sterling, VA, United StatesHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
12	Process Solutions	Exact match	Budapest, HungaryHQ recorded Sep 29, 2026	201-500	328 contacts →
	Exact match “Process Solutions (PS) is a group providing Business Process Outsourcing services, operating an independent accounting business in the Central European region.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
13	Unison Globus	Exact match	Coral Springs, FL, United StatesHQ recorded Sep 29, 2026	201-500	320 contacts →
	Exact match “Unison Globus is a global accounting outsourcing and offshore staffing partner dedicated to supporting CPA firms and accounting professionals.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
14	GI Outsourcing	Exact match	London, United KingdomHQ recorded Sep 29, 2026	201-500	311 contacts →
	Exact match “GI Outsourcing is a UK-based accountants outsourcing firm.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
15	BDO Solutions	Exact match	Moka, MauritiusHQ recorded Sep 29, 2026	501-1,000	310 contacts →
	Exact match “BDO Solutions is a Business Services & Outsourcing company located in Mauritius and forms part of the international BDO network, which extends across 166 countries and…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
16	Buchprufer Consultants LLP	Exact match	Calicut, IndiaHQ recorded Sep 29, 2026	201-500	294 contacts →
	Exact match “Founded in 2007, Buchprufer Consultants has grown into a trusted and reputed outsourcing partner delivering high-quality financial and professional services.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
17	Taxprime	Exact match	Jakarta Selatan, IndonesiaHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
18	Mayatax	Exact match	Houston, TX, United StatesHQ recorded Sep 29, 2026	501-1,000	269 contacts →
	Exact match “Growth exposes financial weakness.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
19	FBC Farm And Small Business TAX Consultants	Exact match	Calgary, AB, CanadaHQ recorded Sep 29, 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 29, 2026 · View company records in RevenueBase
20	Sureprep India Pvt.Ltd	Exact match	Mumbai, IndiaHQ recorded Sep 29, 2026	501-1,000	256 contacts →
	Exact match “Providing tax preparation products and solutions to the accounting profession to increase productivity.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
21	Virtual Clone	Exact match	Bhilai, IndiaHQ recorded Sep 29, 2026	51-200	243 contacts →
	Exact match “Virtual Clone is a leading provider of accounting outsourcing services, tailored specifically for ACCA/FCCA and Chartered Accountancy firms in the UK and Australia.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
22	Tax2win	Exact match	Jaipur, IndiaHQ recorded Sep 29, 2026	201-500	243 contacts →
	Exact match “Indian tax laws are a maze of deadlines, exemptions and penalties, making it difficult for the taxpayer to file their ITR.” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
23	taxbuddy.com	Exact match	Mumbai, IndiaHQ recorded Sep 29, 2026	n/a	240 contacts →
	Exact match “Welcome to TaxBuddy, your one-stop solution for all your tax preparation and filing needs- happy users across 2600 towns in India - 4.9 star Google rating from customers - Led by…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
24	Zenwork, INC	Exact match	Fayetteville, AR, United StatesHQ recorded Sep 29, 2026	51-200	206 contacts →
	Exact match “Zenwork, through its Tax1099 and Compliancely brands, is a fast-growing digital tax compliance and regulatory reporting technology company, with 10+ years of experience powering…” Recorded in the RevenueBase company graph · Sep 29, 2026 · View company records in RevenueBase
25	Inventyv Software Services Pvt. LTD	Exact match	Ahmedabad, IndiaHQ recorded Sep 29, 2026	201-500	201 contacts →
	Exact match “Inventyv Software Services Pvt.” Recorded in the RevenueBase company graph · Sep 29, 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 preparation outsourcing 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 12,873 tax preparation outsourcing services worldwide

See the full list, filter by size, metro and specialty, and access 25,391 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Tax preparation outsourcing services worldwide at a glance

As of Sep 29, 2026

18.5%Verified-email coverage

10.6Average 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

9,387

11-50

2,751

51-200

427

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 preparation outsourcing services are linked below.
What qualifies: Company records worldwide whose business descriptions match “tax preparation outsourcing 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 25,391 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 29, 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 preparation outsourcing services by location

49 lists · largest first

Every Tax preparation outsourcing 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 preparation outsourcing services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many tax preparation outsourcing services are there worldwide?

RevenueBase identified 12,873 company matches for tax preparation outsourcing services 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 preparation outsourcing services?

The United States leads with 6,269 companies, followed by Germany (1,085) and India (661). Every tax preparation outsourcing services list by country and city is linked on this page.

Which city has the most tax preparation outsourcing services?

New York leads with 149 company records, followed by Houston (144) and Sao Paulo (102).

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 25,391 professional contacts with verified work emails tracked across these 12,873 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 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 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.