Company lists · Data refreshed September 2026

Top 25 Managed IT services for tax firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 5,807 companies tracked

RevenueBase identified 5,807 managed IT services for tax firms headquartered in the United States as of September 2026 and tracks 104,939 professional contacts across them, including 26,852 with verified work emails. New York is the largest hub.

This list covers managed IT services for tax firms 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 28, 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 28, 2026 86% judged on-target in blind review

5,807Companies

104,939Contacts tracked

26,852Verified emails

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The 25 largest managed IT services for tax firms based in the United States

Ranked by team size

Top 25 of 5,807 managed IT services for tax firms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to managed IT services for tax 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 28, 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 28, 2026
2	RYAN	Partial evidence	Dallas, TX, United StatesHQ checked Sep 28, 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 28, 2026
3	DMA	Partial evidence	Fort Wayne, IN, United StatesHQ checked Sep 28, 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 28, 2026
4	TPX	Indirect evidence	Austin, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	751 contacts →
	Indirect evidence “TPx is the reliable sidekick every growing business deserves, powering your tech while you take the lead.” Source: RevenueBase Database · checked Sep 28, 2026
5	IT Solutions	Partial evidence	Fort Washington, PA, United StatesHQ checked Sep 28, 2026	501-1,000	683 contacts →
	Partial evidence “With 30 years of experience as a trusted managed services provider, we're your dedicated partner in navigating the complex world of technology, so you can focus on growing your…” Source: RevenueBase Database · checked Sep 28, 2026
6	NIC	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 28, 2026	n/a	581 contacts →
	Partial evidence “NIC has been providing IT Solutions, Cybersecurity, and Cloud Services for businesses and organizations for the past two decades.” Source: RevenueBase Database · checked Sep 28, 2026
7	Rightworks	Partial evidence	Nashua, NH, United StatesHQ checked Sep 28, 2026	501-1,000	577 contacts →
	Partial evidence “Obsessed with all things accounting, Rightworks is the preferred cloud service provider for businesses and accounting and tax firms.” Source: RevenueBase Database · checked Sep 28, 2026
8	Integris	Partial evidence	Cranbury Township, NJ, United StatesHQ checked Sep 28, 2026	501-1,000	574 contacts →
	Partial evidence “Integris is a national leader in future-ready Managed Services, delivering innovative solutions that drive digital maturity for small and midsize businesses.” Source: RevenueBase Database · checked Sep 28, 2026
9	Ntiva, INC	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 28, 2026	501-1,000	505 contacts →
	Indirect evidence “At Ntiva, growing people (our employees, partners, and clients) is our mission.” Source: RevenueBase Database · checked Sep 28, 2026
10	Vc3	Strong evidence	Columbia, SC, United StatesHQ checked Sep 28, 2026	501-1,000	495 contacts →
	Strong evidence “VC3 is a managed IT and cybersecurity services provider serving organizations throughout the US and Canada.” Source: RevenueBase Database · checked Sep 28, 2026
11	Meriplex	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	501-1,000	450 contacts →
	Indirect evidence “If you’re a midsize enterprise with employees (i.e, an “MSE” according to Gartner), we know what you’re going through.” Source: RevenueBase Database · checked Sep 28, 2026
12	Smith Howard	Partial evidence	Atlanta, GA, United StatesHQ checked Sep 28, 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 28, 2026
13	Apercen Partners LLC	Partial evidence	Palo Alto, CA, United StatesHQ checked Sep 28, 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 28, 2026
14	Computer Solutions	Strong evidence	San Antonio, TX, United StatesHQ checked Sep 28, 2026	51-200	389 contacts →
	Strong evidence “Computer Solutions: Trusted Managed IT Services and Cybersecurity Partner in San Antonio, Texas For more than 46 years, Computer Solutions has helped businesses, schools…” Source: RevenueBase Database · checked Sep 28, 2026
15	Cohesive	Indirect evidence	Exton, PA, United StatesHQ checked Sep 28, 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 28, 2026
16	Taxdome	Strong evidence	Cheyenne, WY, United StatesHQ checked Sep 28, 2026	201-500	340 contacts →
	Strong evidence “TaxDome is the leading practice management platform built for full-service tax, bookkeeping, and accounting firms.” Source: RevenueBase Database · checked Sep 28, 2026
17	Sagenext Infotech LLC	Partial evidence	Augusta, GA, United StatesHQ checked Sep 28, 2026	51-200	323 contacts →
	Partial evidence “Sagenext, based in Augusta, GA, is a trusted provider of secure cloud hosting solutions for CPAs, accountants, tax professionals, and small businesses across the globe.” Source: RevenueBase Database · checked Sep 28, 2026
18	1-800accountant	Indirect evidence	New York, NY, United StatesHQ checked Sep 28, 2026	201-500	320 contacts →
	Indirect evidence “1-800Accoutant is America’s leading virtual accounting firm for small businesses.” Source: RevenueBase Database · checked Sep 28, 2026
19	Protech Services Group, INC	Strong evidence	Memphis, TN, United StatesHQ checked Sep 28, 2026	51-200	296 contacts →
	Strong evidence “We know that CIOs, CISOs, CTOs, and IT Directors wear a lot of hats-navigating security threats, modernizing infrastructure, managing internal expectations, all while still…” Source: RevenueBase Database · checked Sep 28, 2026
20	Centre Technologies	Strong evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	201-500	286 contacts →
	Strong evidence “Centre is a modern IT and cybersecurity partner delivering Managed IT, Business Intelligence, Cybersecurity, and Cloud services.” Source: RevenueBase Database · checked Sep 28, 2026
21	GTM Global TAX Management	Partial evidence	Wayne, PA, United StatesHQ checked Sep 28, 2026	201-500	281 contacts →
	Partial evidence “GTM is a leading provider of corporate tax services.” Source: RevenueBase Database · checked Sep 28, 2026
22	Corporate Technologies LLC	Strong evidence	Eden Prairie, MN, United StatesHQ checked Sep 28, 2026	201-500	274 contacts →
	Strong evidence “Corporate Technologies is a leading provider of managed IT solutions to small businesses and organizations in Minnesota, North Dakota, California, Michigan, New Mexico, Arkansas…” Source: RevenueBase Database · checked Sep 28, 2026
23	Mayatax	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	501-1,000	269 contacts →
	Indirect evidence “Growth exposes financial weakness.” Source: RevenueBase Database · checked Sep 28, 2026
24	KE Andrews	Strong evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	201-500	224 contacts →
	Strong evidence “In operation since 1978, KE Andrews is one of the largest state and local tax firms in the country, managing over $500 billion in assets.” Source: RevenueBase Database · checked Sep 28, 2026
25	Systems Engineering	Strong evidence	Portland, ME, United StatesHQ checked Sep 28, 2026	51-200	217 contacts →
	Strong evidence “Founded in 1988, Systems Engineering is a SOC 2, Type 2-certified IT strategy and managed technology services provider.” Source: RevenueBase Database · checked Sep 28, 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: managed IT services for tax 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 managed IT services for tax firms.
Partial evidence: Its own public description names part of managed IT services for tax firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name managed IT services for tax 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 5,807 managed IT services for tax firms based in the United States

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Managed IT services for tax firms based in the United States at a glance

As of Sep 28, 2026

25.6%Verified-email coverage

18.1Average contacts per company

1-10Median size (employees)

2.7%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

4,227

11-50

1,264

51-200

214

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 5,807 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 managed IT services for tax 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.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “managed IT services for tax 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 managed IT services for tax 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 managed IT services for tax firms, 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, 26,852 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 28, 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.

Managed IT services for tax firms 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 managed IT services for tax 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 managed IT services for tax firms are there based in the United States?

RevenueBase identified 5,807 managed IT services for tax firms 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 managed IT services for tax firms?

New York leads with 159 headquartered companies, followed by Houston (126) and Chicago (70).

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 26,852 verified decision-maker contacts tracked across these 5,807 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 28, 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.