Company lists · Data refreshed September 2026

Top 25 Tax accounting outsourcing companies based in the United States

Name: Tax accounting outsourcing companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 7,973 companies tracked

RevenueBase identified 7,973 tax accounting outsourcing companies headquartered in the United States as of September 2026 and tracks 110,709 professional contacts across them, including 23,963 with verified work emails. New York is the largest hub.

This list covers tax accounting outsourcing companies headquartered in the United States, 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.

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

7,973Companies

110,709Contacts tracked

23,963Verified emails

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The 25 largest tax accounting outsourcing companies based in the United States

Ranked by team size

Top 25 of 7,973 tax accounting outsourcing companies based in the United States, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to tax accounting outsourcing companies: 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	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
3	Bennett Thrasher	Strong evidence	Atlanta, GA, United StatesHQ checked Sep 29, 2026	201-500	558 contacts →
	Strong evidence “Bennett Thrasher provides proven guidance for financial confidence through premier tax, audit, advisory, and outsourcing solutions.” Source: RevenueBase Database · checked Sep 29, 2026
4	Sensiba LLP	Strong evidence	San Jose, CA, United StatesHQ checked Sep 29, 2026	501-1,000	493 contacts →
	Strong evidence “Sensiba’s comprehensive accounting, tax, and consulting services help businesses and people solve problems, navigate complexity, and build a foundation for sustainable growth.” Source: RevenueBase Database · checked Sep 29, 2026
5	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
6	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
7	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
8	Unison Globus	Strong evidence	Coral Springs, FL, United StatesHQ checked Sep 29, 2026	201-500	320 contacts →
	Strong 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
9	Squire	Partial evidence	Orem, UT, United StatesHQ checked Sep 29, 2026	201-500	297 contacts →
	Partial evidence “Squire is a nationally recognized audit, tax, and business advisory firm serving clients across the U.S.” Source: RevenueBase Database · checked Sep 29, 2026
10	GTM Global TAX Management	Partial evidence	Wayne, PA, United StatesHQ checked Sep 29, 2026	201-500	281 contacts →
	Partial evidence “GTM is a leading provider of corporate tax services.” Source: RevenueBase Database · checked Sep 29, 2026
11	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
12	TJT	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 29, 2026	201-500	231 contacts →
	Indirect evidence “Thomas, Judy and Tucker, P.A.” Source: RevenueBase Database · checked Sep 29, 2026
13	Porte Brown LLC	Partial evidence	Elk Grove Village, IL, United StatesHQ checked Sep 29, 2026	51-200	191 contacts →
	Partial evidence “Porte Brown LLC is a full service accounting and consulting firm headquartered in the Chicago suburb of Elk Grove Village, Illinois.” Source: RevenueBase Database · checked Sep 29, 2026
14	Infinity Globus, A Springline Company	Strong evidence	Dallas, TX, United StatesHQ checked Sep 29, 2026	201-500	168 contacts →
	Strong 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, 2026
15	Geffen Mesher	Partial evidence	Portland, OR, United StatesHQ checked Sep 29, 2026	51-200	160 contacts →
	Partial evidence “We’re a Portland-based accounting firm with a 90+ year legacy, and we’re continuing to grow and evolve every day.” Source: RevenueBase Database · checked Sep 29, 2026
16	Mize Cpas INC	Partial evidence	Topeka, KS, United StatesHQ checked Sep 29, 2026	1,001-5,000	146 contacts →
	Partial evidence “Mize CPAs is now part of Aprio, a Top 25 premier, full-service business advisory and accounting firm that’s passionate for what’s next.” Source: RevenueBase Database · checked Sep 29, 2026
17	Konnect Books & Taxes- Virtual CFO & USA TAX Consultants	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	51-200	145 contacts →
	Partial evidence “Konnect Books & Taxes, is an International Bookkeeping, Tax & Advisory firm, in the USA, with CPAs & Accountants, ready to help you take care of ALL your numbers.” Source: RevenueBase Database · checked Sep 29, 2026
18	KWC Cpas	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 29, 2026	51-200	133 contacts →
	Indirect evidence “KWC is a team of accountants and advisors all dedicated to the founding principle of providing Quality Personal Service.” Source: RevenueBase Database · checked Sep 29, 2026
19	Mcgill, Power, Bell & Associates, LLP	Partial evidence	Meadville, PA, United StatesHQ checked Sep 29, 2026	51-200	121 contacts →
	Partial evidence “McGill, Power, Bell & Associates, LLP (“MPB”) is a public accounting firm with five Pennsylvania offices located in the cities of Erie, Franklin, Grove City, Meadville, and…” Source: RevenueBase Database · checked Sep 29, 2026
20	Lavine, Lofgren, Morris & Engelberg, LLP	Indirect evidence	La Jolla, CA, United StatesHQ checked Sep 29, 2026	51-200	118 contacts →
	Indirect evidence “Since 1985, we’ve built a firm where clients receive the highest quality of services, where our people play an important role as they grow professionally and where we as a firm…” Source: RevenueBase Database · checked Sep 29, 2026
21	Flsv LLP	Strong evidence	Garden City, NY, United StatesHQ checked Sep 29, 2026	51-200	109 contacts →
	Strong evidence “Frankel Loughran Starr & Vallone LLP (FLSV), a premier accounting, tax advisory and compliance firm focused primarily in the financial services industry, was formed in 1995 by…” Source: RevenueBase Database · checked Sep 29, 2026
22	Bartlett, Pringle & Wolf, LLP	Partial evidence	Santa Barbara, CA, United StatesHQ checked Sep 29, 2026	51-200	102 contacts →
	Partial evidence “Bartlett, Pringle & Wolf, LLP is the leading accounting and consulting firm on the Central Coast of California providing a collection of premium services to support your lifestyle.” Source: RevenueBase Database · checked Sep 29, 2026
23	Mytaxfiler	Partial evidence	Plano, TX, United StatesHQ checked Sep 29, 2026	51-200	100 contacts →
	Partial evidence “At MyTaxFiler, we offer more than just tax preparation-we provide peace of mind.” Source: RevenueBase Database · checked Sep 29, 2026
24	Archer Lewis	Strong evidence	Chicago, IL, United StatesHQ checked Sep 29, 2026	501-1,000	94 contacts →
	Strong evidence “Archer Lewis is your local trusted advisor for accounting and tax services.” Source: RevenueBase Database · checked Sep 29, 2026
25	Capactix Business Solutions	Partial evidence	New York, NY, United StatesHQ checked Sep 29, 2026	51-200	92 contacts →
	Partial evidence “We are one of the leading offshore companies that offer the best in the industry staffing solutions to CPAs, accounting firms, and other companies.” 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 accounting 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 accounting outsourcing companies.
Partial evidence: Its own public description names part of tax accounting 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 accounting 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 7,973 tax accounting outsourcing companies based in the United States

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Tax accounting outsourcing companies based in the United States at a glance

As of Sep 29, 2026

21.6%Verified-email coverage

13.9Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · New York

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

6,149

11-50

1,474

51-200

226

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 7,973 companies.

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 accounting 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “tax accounting 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 accounting 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 accounting outsourcing companies, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
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, 23,963 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 accounting outsourcing companies by metro

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 accounting 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 accounting outsourcing companies are there based in the United States?

RevenueBase identified 7,973 tax accounting outsourcing companies headquartered in the United States 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 city has the most tax accounting outsourcing companies?

New York leads with 220 headquartered companies, followed by Houston (165) and Miami (94).

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 23,963 verified decision-maker contacts tracked across these 7,973 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.