Company lists · Data refreshed September 2026
Top 25 Pro bono tax firms based in the United States
RevenueBase identified 482 pro bono tax firms headquartered in the United States as of September 2026 and tracks 68,275 professional contacts across them, including 7,391 with verified work emails. Houston is the largest hub.
This list covers pro bono 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 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.
The 25 largest pro bono tax firms based in the United States
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 20, 2026Thanks. The Data Team will review it. | |||||
| 2 | 6,260 contacts → | ||||
Partial evidence “Liberty Tax is income tax preparation at its best: friendly, accurate, and with a money back guarantee.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 3 | 142 contacts → | ||||
Indirect evidence “Established in 1958, Legal Aid Center of Southern Nevada is a private, non-profit, 501(c)(3) organization that ensures equal access to justice through free legal advice and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 4 | 122 contacts → | ||||
Indirect evidence “Could you live on less than a year?” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 5 | 115 contacts → | ||||
Partial evidence “Accounting Aid Society - Growing an Economy That Works for Everyone Accounting Aid Society (AAS) is a nonprofit organization that offers free tax help and counseling; financial…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 6 | 101 contacts → | ||||
Indirect evidence “The Campaign for Working Families, Inc.(CWF) is a 501(c)(3) non-profit organization committed to helping working families and individuals achieve economic empowerment by providing…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 7 | 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, 2026Thanks. The Data Team will review it. | |||||
| 8 | 49 contacts → | ||||
Indirect evidence “At Ladder Up, we believe hard work and hardship shouldn’t go together.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 9 | 32 contacts → | ||||
Partial evidence “For many years PRECISION ACCOUNTING has been helping individuals, families and small businesses in the community prepare their taxes.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 10 | 30 contacts → | ||||
Indirect evidence “Since 1949, Miami-Dade County Legal Aid has been providing free civil legal services to qualifying low-income residents of Miami-Dade County.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 11 | 28 contacts → | ||||
Partial evidence “Through skilled volunteers, Tax-Aid provides free year-round tax services to strengthen our San Francisco Bay Area community.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 12 | 28 contacts → | ||||
Indirect evidence “CASH (Creating Assets, Savings and Hope) Oregon is a program of Metropolitan Family Service committed to improving the financial health of low income working families and…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 13 | 15 contacts → | ||||
Partial evidence “The mission of the Denver Asset Building Coalition (DABC) is to provide free tax preparation, financial education, and financial services through accessible sites in Denver to…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 14 | 13 contacts → | ||||
Partial evidence “Community Tax Aid, Inc.(CTA) is an all-volunteer, non-profit, tax-exempt organization (501(c)(3)) that has been preparing tax returns FREE for low-income individuals and families…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 15 | 13 contacts → | ||||
Partial evidence “ARKANSAS ASSET BUILDERS is a nonprofit organization based on Conway, Arkansas, that empowers our hardworking neighbors to flourish economically by providing access to free tax…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 16 | 11 contacts → | ||||
Partial evidence “Experienced, Friendly and Affordable Tax Preparation with convenient locations in and around St.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 17 | 11 contacts → | ||||
Indirect evidence “J.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 18 | 10 contacts → | ||||
Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 19 | 8 contacts → | ||||
Partial evidence “Services include: Income Tax Preparation for individuals and businesses, for Public Charities, Trade Associations and other Not-for-Profit entities and for Private Foundations…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 20 | 8 contacts → | ||||
Partial evidence “Call us for all your income tax preparation services and bookkeeping needs.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 21 | 8 contacts → | ||||
Partial evidence “The Community Tax Law Project (CTLP) ensures the fairness and integrity of the tax system by providing free legal representation to low-income Virginia taxpayers in tax disputes…” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 22 | 8 contacts → | ||||
Partial evidence “This was our second year in a row trusting Kristy with our taxes.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 23 | 8 contacts → | ||||
Indirect evidence “Grow Brooklyn’s mission is to enable community members to grow and preserve their assets, thereby securing their economic future.” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 24 | 8 contacts → | ||||
Indirect evidence “If you are looking for a blend of personal service and expertise, you have come to the right place!” Source: RevenueBase Database · checked Sep 20, 2026Thanks. The Data Team will review it. | |||||
| 25 | 7 contacts → | ||||
Partial evidence “We provide affordable professional tax service to individuals and small business at prices lower than the national tax service chains.” Source: RevenueBase Database · checked Sep 20, 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: pro bono 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 pro bono tax firms.
- Partial evidence
- Its own public description names part of pro bono tax firms, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name pro bono 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 482 pro bono tax firms based in the United States
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Pro bono tax firms based in the United States at a glance
As of Sep 20, 2026Companies by employee count
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 482 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 pro bono 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 “pro bono 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 pro bono 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 pro bono 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, 7,391 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.
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 pro bono 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 pro bono tax firms are there based in the United States?
RevenueBase identified 482 pro bono 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 pro bono tax firms?
Houston leads with 12 headquartered companies, followed by Los Angeles (9) and Brooklyn (7).
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 7,391 verified decision-maker contacts tracked across these 482 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.
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