Company lists · Data refreshed September 2026
Top 25 Tax compliance outsourcing companies worldwide
RevenueBase identified 7,282 tax compliance outsourcing companies worldwide as of September 2026 and tracks 107,976 professional contacts across them, including 17,347 with verified work emails. The United States is the largest market and Houston the largest hub.
This list covers tax compliance outsourcing companies 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 compliance outsourcing companies 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.
The 25 largest tax compliance outsourcing companies worldwide
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 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, 2026Thanks. The Data Team will review it. | |||||
| 2 | 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, 2026Thanks. The Data Team will review it. | |||||
| 3 | 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, 2026Thanks. The Data Team will review it. | |||||
| 4 | 562 contacts → | ||||
Strong evidence “KPMG Global Services Hungary (KGSH) provides centralised tax compliance services to multinational companies.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 5 | 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, 2026Thanks. The Data Team will review it. | |||||
| 6 | 364 contacts → | ||||
Indirect evidence “Cohesive is a leading solutions provider and systems integrator for IBM Maximo.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 269 contacts → | ||||
Indirect evidence “Growth exposes financial weakness.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 9 | 240 contacts → | ||||
Partial evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 10 | 206 contacts → | ||||
Strong evidence “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…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 11 | 177 contacts → | ||||
Partial evidence “Thoughtfully structuring and managing your tax affairs is more important than ever.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 12 | 168 contacts → | ||||
Partial evidence “Infinity Globus, a Springline company, is a leading accounting outsourcing firm with over two decades of industry experience, providing tailored taxation and accounting services…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 13 | 136 contacts → | ||||
Partial evidence “Taxwell is a leading digital tax filing platform formed in 2022 from the combination of Drake Software® and TaxAct®.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 14 | 115 contacts → | ||||
Partial evidence “Expat US Tax helps US citizens and Green Card holders living and working abroad, with a focus on Australia, the UK and the Middle East.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 15 | 104 contacts → | ||||
Partial evidence “Online Accounting Service | Bookkeeping | Payroll | Personal Tax Return Filing to HMRC | Corporation Tax Filing | HMRC ONLINE FILING: Our aim is to help small business owners` tax…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 16 | 100 contacts → | ||||
Partial evidence “At MyTaxFiler, we offer more than just tax preparation-we provide peace of mind.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 17 | 98 contacts → | ||||
Indirect evidence “We add value to CFO’s and Accounts Team by solving following problems and more through our value added services: Subjectivity (or favoritism) in transaction processing Delay in…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 18 | 95 contacts → | ||||
Indirect evidence “A Avalara ajuda empresas de todos os tamanhos a ficarem em dia com seus impostos e obrigações fiscais exigidos pelo Fisco nos níveis Federal, Estadual e Municipal.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 19 | 93 contacts → | ||||
Indirect evidence “A SETECO Consultoria Contábil transforma conhecimento e experiência acumulados ao longo de mais de 50 anos em valor para o cliente.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 20 | 93 contacts → | ||||
Indirect evidence “DgTx - Empowering Digital Taxation DgTx, the pioneering collaboration between Etisalat and DgTx, is revolutionizing the landscape of Digital Taxation in the United Arab Emirates.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 21 | 92 contacts → | ||||
Indirect evidence “Ventura Pranas is a cross-border advisory firm providing specialised solutions to individuals and companies across the US, India, and Singapore.” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 22 | 88 contacts → | ||||
Partial evidence “Shoonya Tax is a consulting firm registered in US and India providing services like Tax return filing for Individual and Corporates, book keeping and payroll services for both US…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 23 | 85 contacts → | ||||
Partial evidence “Crescent Tax Filing, Inc- Your Trusted Partner in US #Tax Services for Over 7 Years Welcome to Crescent Tax Filing, Inc, your go-to destination for comprehensive US Tax…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 24 | 84 contacts → | ||||
Indirect evidence “A PERSON personaliza seus serviços superando as ofertas do mercado e estabelecendo relações de cumplicidade e união efetiva com seus clientes, tratando cada um deles de modo…” Source: RevenueBase Database · checked Sep 29, 2026Thanks. The Data Team will review it. | |||||
| 25 | 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 29, 2026Thanks. The Data Team will review it. | |||||
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 compliance outsourcing companies. 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 compliance outsourcing companies.
- Partial evidence
- Its own public description names part of tax compliance outsourcing companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name tax compliance outsourcing companies. 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 7,282 tax compliance outsourcing companies worldwide
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Tax compliance outsourcing companies worldwide at a glance
As of Sep 29, 2026Companies by employee count
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 compliance outsourcing companies, 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 compliance outsourcing companies are linked below.
- What qualifies
- Companies worldwide whose own description of what they do matches “tax compliance outsourcing companies”. 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 compliance outsourcing companies), 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 compliance outsourcing companies, 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, 17,347 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 compliance outsourcing companies by location
27 lists · largest firstEvery Tax compliance outsourcing companies list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.
Countries
- Tax compliance outsourcing companies based in the United States2,942
- Tax compliance outsourcing companies based in Germany872
- Tax compliance outsourcing companies based in India729
- Tax compliance outsourcing companies based in Canada245
- Tax compliance outsourcing companies based in Brazil188
- Tax compliance outsourcing companies based in the United Kingdom182
- Tax compliance outsourcing companies based in Australia167
- Tax compliance outsourcing companies based in the Netherlands129
- Tax compliance outsourcing companies based in Indonesia78
- Tax compliance outsourcing companies based in South Africa68
- Tax compliance outsourcing companies based in Austria59
- Tax compliance outsourcing companies based in Poland43
Cities
- Tax compliance outsourcing companies based in Houston, United States76
- Tax compliance outsourcing companies based in New York, United States72
- Tax compliance outsourcing companies based in Berlin, Germany64
- Tax compliance outsourcing companies based in London, United Kingdom62
- Tax compliance outsourcing companies based in New Delhi, India61
- Tax compliance outsourcing companies based in Miami, United States43
- Tax compliance outsourcing companies based in Mumbai, India43
- Tax compliance outsourcing companies based in Chicago, United States38
- Tax compliance outsourcing companies based in Dallas, United States33
- Tax compliance outsourcing companies based in Hamburg, Germany31
- Tax compliance outsourcing companies based in Atlanta, United States29
- Tax compliance outsourcing companies based in Los Angeles, United States29
- Tax compliance outsourcing companies based in Austin, United States28
- Tax compliance outsourcing companies based in San Diego, United States28
- Tax compliance outsourcing companies based in Toronto, Canada28
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 compliance outsourcing companies, 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 compliance outsourcing companies are there worldwide?
RevenueBase identified 7,282 tax compliance outsourcing companies 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 compliance outsourcing companies?
The United States leads with 2,942 companies, followed by Germany (872) and India (729). Every tax compliance outsourcing companies list by country and city is linked on this page.
Which city has the most tax compliance outsourcing companies?
Houston leads with 76 headquartered companies, followed by New York (73) and London (66).
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 17,347 verified decision-maker contacts tracked across these 7,282 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.