Company lists · Data refreshed September 2026

Top 25 International tax services based in the United States

Name: International tax services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,893 companies tracked

RevenueBase identified 1,893 international tax services headquartered in the United States as of September 2026 and tracks 23,797 professional contacts across them, including 11,408 with verified work emails. New York is the largest hub.

This list covers international tax services 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 20, 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 20, 2026 86% judged on-target in blind review

1,893Companies

23,797Contacts tracked

11,408Verified emails

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The 25 largest international tax services based in the United States

Ranked by team size

Top 25 of 1,893 international tax services based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to international tax services: 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	RYAN	Partial evidence	Dallas, TX, United StatesHQ checked Sep 20, 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 20, 2026
2	PKF O'connor Davies	Strong evidence	Harrison, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	1,730 contacts →
	Strong evidence “PKF O’Connor Davies is a top-tier accounting, tax and advisory practice with a long history of serving domestic and international clients.” Source: RevenueBase Database · checked Sep 20, 2026
3	DMA	Partial evidence	Fort Wayne, IN, United StatesHQ checked Sep 20, 2026	501-1,000	861 contacts →
	Partial evidence “Great Place to Work® Certified™ DMA, a proudly employee-owned company, has been solving corporate tax challenges for its clients since 1972.” Source: RevenueBase Database · checked Sep 20, 2026
4	Sensiba LLP	Partial evidence	San Jose, CA, United StatesHQ checked Sep 20, 2026	501-1,000	493 contacts →
	Partial 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 20, 2026
5	Smith Howard	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 20, 2026	501-1,000	413 contacts →
	Partial evidence “Smith + Howard is a tax, accounting, advisory, and consulting firm headquartered in Atlanta, with a global presence.” Source: RevenueBase Database · checked Sep 20, 2026
6	Apercen Partners LLC	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 20, 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 20, 2026
7	Cohesive	Indirect evidence	Exton, PA, United StatesHQ checked Sep 20, 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 20, 2026
8	Drummond Advisors	Partial evidence	Boston, MA, United StatesHQ checked Sep 20, 2026	201-500	322 contacts →
	Partial evidence “Drummond Advisors provides global consulting services to companies focusing on accounting, tax, legal and business development.” Source: RevenueBase Database · checked Sep 20, 2026
9	GTM Global TAX Management	Partial evidence	Wayne, PA, United StatesHQ checked Sep 20, 2026	201-500	281 contacts →
	Partial evidence “GTM is a leading provider of corporate tax services.” Source: RevenueBase Database · checked Sep 20, 2026
10	AOTAX	Indirect evidence	Sterling, VA, United StatesHQ checked Sep 20, 2026	201-500	216 contacts →
	Indirect evidence “AOTAX is a leading U.S.” Source: RevenueBase Database · checked Sep 20, 2026
11	Funaro & CO	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	146 contacts →
	Indirect evidence “Founded in 1947, Funaro & Co.” Source: RevenueBase Database · checked Sep 20, 2026
12	HLS Global	Partial evidence	Torrance, CA, United StatesHQ checked Sep 20, 2026	51-200	146 contacts →
	Partial evidence “USA Japan Mexico India Germany UAE Singapore "Accounting, Taxation, & Business Advisory between Japan and the World" HLS Global Group is an international accounting and business…” Source: RevenueBase Database · checked Sep 20, 2026
13	Konnect Books & Taxes- Virtual CFO & USA TAX Consultants	Strong evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	145 contacts →
	Strong 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 20, 2026
14	Knav US	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 20, 2026	51-200	126 contacts →
	Partial evidence “KNAV is a dynamic global accounting and consulting firm, offering a comprehensive range of services including accounting, assurance, taxation, international transfer pricing…” Source: RevenueBase Database · checked Sep 20, 2026
15	Lavine, Lofgren, Morris & Engelberg, LLP	Indirect evidence	La Jolla, CA, United StatesHQ checked Sep 20, 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 20, 2026
16	Jade Fiducial	Partial evidence	New York, NY, United StatesHQ checked Sep 20, 2026	51-200	114 contacts →
	Partial evidence “Advisory & Tax Services With 14 Offices in the USA, located in Atlanta, Boston, Chicago, Dallas, Fort Lauderdale, Houston, Los Angeles, Miami, New York, Orlando, Palo Alto, San…” Source: RevenueBase Database · checked Sep 20, 2026
17	R&m Consulting	Partial evidence	Chicago, IL, United StatesHQ checked Sep 20, 2026	51-200	102 contacts →
	Partial evidence “R&M is a boutique consulting firm that works in two key areas: tax and internal audit.” Source: RevenueBase Database · checked Sep 20, 2026
18	Mytaxfiler	Partial evidence	Plano, TX, United StatesHQ checked Sep 20, 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 20, 2026
19	Wwc, P.C	Indirect evidence	San Mateo, CA, United StatesHQ checked Sep 20, 2026	201-500	97 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
20	Johnson O'connor	Indirect evidence	Wakefield, MA, United StatesHQ checked Sep 20, 2026	51-200	91 contacts →
	Indirect evidence “Founded in 1945, Johnson O’Connor has grown to become one of the preeminent accounting and consulting firms in the Greater Boston area.” Source: RevenueBase Database · checked Sep 20, 2026
21	Murphy, Murphy & Murphy, Cpas	Indirect evidence	Cypress, CA, United StatesHQ checked Sep 20, 2026	51-200	91 contacts →
	Indirect evidence “Our mission is to provide our clients with the best in professional services, with an authentic personal approach.” Source: RevenueBase Database · checked Sep 20, 2026
22	Crescent TAX Filing, INC	Partial evidence	United StatesHQ checked Sep 20, 2026	51-200	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 20, 2026
23	Abitos Accountants Advisors	Strong evidence	Coral Gables, FL, United StatesHQ checked Sep 20, 2026	51-200	84 contacts →
	Strong evidence “AbitOs specializes in the unique accounting and tax needs of high net-worth individuals with international lifestyles, LATAM, Canadian, and other non-US entities doing business in…” Source: RevenueBase Database · checked Sep 20, 2026
24	AG Fintax	Partial evidence	Frisco, TX, United StatesHQ checked Sep 20, 2026	51-200	81 contacts →
	Partial evidence “AG FinTax is a full-service tax advisory and financial consulting firm headquartered in Frisco, Texas, with offices in Bothell, WA and Hyderabad, India.” Source: RevenueBase Database · checked Sep 20, 2026
25	Colbert Ball TAX Service	Partial evidence	Houston, TX, United StatesHQ checked Sep 20, 2026	11-50	77 contacts →
	Partial evidence “Colbert/Ball Tax Service understands that whenever a customer visits their location for service, the client will be immediately assisted by a trained professional.” Source: RevenueBase Database · checked Sep 20, 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: international tax services. 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 international tax services.
Partial evidence: Its own public description names part of international tax services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name international tax services. 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 1,893 international tax services based in the United States

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International tax services based in the United States at a glance

As of Sep 20, 2026

47.9%Verified-email coverage

12.6Average contacts per company

1-10Median size (employees)

4.8%Largest-city concentration · New York

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

1,346

11-50

419

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

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 1,893 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 international tax services, 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 “international tax services”. 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 international tax services), 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 international tax services, 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, 11,408 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 20, 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.

International tax services 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 international tax services, 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 international tax services are there based in the United States?

RevenueBase identified 1,893 international tax services 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?

RYAN, headquartered in Dallas, tops this list with the largest team on record.

Which city has the most international tax services?

New York leads with 90 headquartered companies, followed by Miami (68) and Houston (50).

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 11,408 verified decision-maker contacts tracked across these 1,893 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 20, 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.