A 501(c)(3) cannot endorse or oppose political candidates, cannot let insiders take more than fair-market value out of the organization, cannot make lobbying a substantial part of its work, cannot operate for any purpose other than its charitable mission, and cannot skip its annual IRS filings. Those are the core things a 501(c)(3) cannot do, and each one carries its own penalty structure, from excise taxes on the organization and the people who approved the transaction to automatic loss of tax-exempt status. Some rules are absolute lines. Others turn on how much, how often, and whether the board followed a defined process.
Supporting or Opposing Political Candidates
The campaign prohibition is the brightest line in nonprofit law. Since 1954, when Congress added what is now known as the Johnson Amendment, every 501(c)(3) has been barred from supporting or opposing any candidate for public office.1Internal Revenue Service. Charities, Churches and Politics It is absolute. There is no threshold of campaign intervention the IRS treats as too small to matter.
Writing a check to a campaign is the obvious violation, but the ban reaches further. Publishing a statement favoring a candidate, letting a campaign use the mailing list, lending staff time to a candidate’s organizing effort, or having an officer endorse a candidate in their official capacity all qualify.2Office of the Law Revision Counsel. 26 USC 501 – Exemption From Tax on Corporations, Certain Trusts, Etc. The IRS looks at how the organization’s resources, name, and platform were used, not just whether money changed hands.
A political expenditure triggers a 10 percent excise tax on the amount spent. Any manager who knowingly approved it owes a separate 2.5 percent tax personally. If the violation isn’t corrected within the taxable period, the penalties climb to 100 percent of the expenditure on the organization and 50 percent on a refusing manager.3Office of the Law Revision Counsel. 26 USC 4955 – Taxes on Political Expenditures of Section 501(c)(3) Organizations Revocation of exempt status is also available to the IRS. Anyone with knowledge of a violation can report it using Form 13909.4Internal Revenue Service. Form 13909 – Tax-Exempt Organization Complaint (Referral)
What Stays on the Right Side of the Line
The ban does not silence nonprofits on issues. Voter registration drives, candidate forums that include every candidate and show no favoritism, and nonpartisan voter education guides are all allowed.5Internal Revenue Service. Restriction of Political Campaign Intervention by Section 501(c)(3) Tax-Exempt Organizations The word that matters is nonpartisan. A voter guide that cherry-picks issues to flatter one candidate crosses the line, even without the words “vote for.” Ballot measure and legislative advocacy fall under the lobbying rules, not the campaign ban.
Lobbying as a Substantial Part of the Work
Lobbying is permitted, but a 501(c)(3) cannot let it become a substantial part of what the organization does.6Internal Revenue Service. Lobbying The organization can contact legislators, testify at hearings, and urge the public to support or oppose a bill. The IRS distinguishes direct lobbying (communicating with lawmakers about specific legislation) from grassroots lobbying (urging the public to contact their representatives).
By default, the IRS applies the substantial part test, weighing all facts and circumstances, including staff and volunteer time and dollars spent on legislative advocacy.7Internal Revenue Service. Measuring Lobbying – Substantial Part Test “Substantial” is never defined with a hard number, and an organization that crosses the line loses its exemption entirely for the year.
Organizations that want clarity can elect the expenditure test under Section 501(h), which replaces the vague standard with a sliding-scale dollar formula tied to exempt purpose expenditures and caps total lobbying at $1 million.8Office of the Law Revision Counsel. 26 USC 501 – Exemption From Tax on Corporations, Certain Trusts, Etc. – Section (h) Grassroots lobbying is capped at 25 percent of that lobbying nontaxable amount.9Office of the Law Revision Counsel. 26 USC 4911 – Tax on Excess Expenditures to Influence Legislation Going over the nontaxable amount triggers a 25 percent excise tax on the excess. Consistently exceeding 150 percent of the nontaxable amount triggers revocation.
Paying Insiders More Than Fair-Market Value
No part of a 501(c)(3)’s net earnings may benefit any private shareholder or individual. This private inurement rule targets insiders: board members, officers, founders, key employees, and their families.10Internal Revenue Service. Inurement/Private Benefit – Charitable Organizations The most common failure is executive compensation set above what comparable positions pay in the open market. Below-market loans to officers, directors, or their relatives raise the same concern, and courts have denied exemption where organizations extended unsecured, below-market loans to insiders.
When the IRS finds an insider received more than fair-market value, it can impose intermediate sanctions under Section 4958 rather than jumping to revocation. The insider owes an initial excise tax of 25 percent of the excess amount. Managers who knowingly approved the deal owe 10 percent personally. If the excess benefit isn’t returned within the taxable period, a second-tier tax of 200 percent of the excess benefit kicks in.11Office of the Law Revision Counsel. 26 USC 4958 – Taxes on Excess Benefit Transactions A $100,000 overpayment left uncorrected becomes a $200,000 tax bill for the insider on top of repaying the excess.
The definition of “disqualified person” is broad. It covers anyone who exercised substantial influence over the organization in the previous five years, their spouses, siblings, children, grandchildren and those spouses, plus entities in which these individuals hold more than 35 percent ownership.12eCFR. 26 CFR 53.4958-3 – Definition of Disqualified Person
The Rebuttable Presumption Safe Harbor
Boards that follow three steps when setting compensation create a rebuttable presumption of reasonableness that shifts the burden to the IRS to prove otherwise. The pay must be approved by an independent body with no conflicts of interest, that body must rely on comparable salary data before deciding, and it must document the basis for the decision at the time of the vote.13Internal Revenue Service. Rebuttable Presumption – Intermediate Sanctions Skipping the process leaves the board exposed.
Private Benefit to Outsiders
A separate rule bars a 501(c)(3) from serving any private interest, insider or outsider, more than incidentally. An organization structured so that a particular business captures most of the economic advantage fails this test even when no insider personally profits.14eCFR. 26 CFR 1.501(c)(3)-1 – Organizations Organized and Operated for Religious, Charitable, Scientific, Testing for Public Safety, Literary, or Educational Purposes, or for the Prevention of Cruelty to Children or Animals
Drifting from the Exempt Purpose
A 501(c)(3) must operate primarily for its stated exempt purpose, whether education, religion, scientific research, or another qualifying category. The IRS applies an operational test: if more than an insubstantial part of the organization’s activities doesn’t further an exempt purpose, the exemption fails.15Internal Revenue Service. Operational Test Internal Revenue Code Section 501(c)(3) A single substantial non-exempt purpose is enough to destroy the exemption, no matter how many legitimate charitable programs run alongside it.
Unrelated Business Income
Nonprofits can earn commercial income, but activities regularly carried on and not substantially related to the exempt purpose are taxed. The unrelated business income tax applies at the standard corporate rate of 21 percent.16Office of the Law Revision Counsel. 26 USC 511 – Imposition of Tax on Unrelated Business Income of Charitable, Etc., Organizations Any organization with $1,000 or more in gross income from an unrelated trade or business must file Form 990-T.17Internal Revenue Service. Instructions for Form 990-T (2025)
Owing UBIT is not itself a threat to exempt status. The danger appears when commercial activity dominates. The IRS and courts look at whether the nonprofit competes directly with for-profit businesses, prices services at market rates rather than below cost, relies on sales revenue rather than donations, and uses commercial advertising methods. When these factors line up, the organization looks less like a charity that happens to sell something and more like a business wearing a nonprofit label, and revocation becomes possible.
Missing Three Years of Annual Filings
Every 501(c)(3) must file an annual information return, typically Form 990, 990-EZ, or 990-N depending on size. Miss three consecutive years and tax-exempt status is automatically revoked. No warning letter, no grace period, no discretion. Revocation happens by operation of law on the filing due date of the third missed return.18Internal Revenue Service. Automatic Revocation of Exemption The IRS publishes a public list of every organization revoked this way.
Getting reinstated means filing a new exemption application with the appropriate user fee, plus every delinquent return. Applying within 15 months of the revocation notice, for an organization that has never been auto-revoked before, opens a streamlined path that can restore status retroactively. After 15 months, the organization has to demonstrate reasonable cause for each of the three missed years.19Internal Revenue Service. Automatic Revocation – How to Have Your Tax-Exempt Status Reinstated During the gap, the organization is taxable and donors cannot deduct their gifts.
Refusing to Disclose Required Documents
A 501(c)(3) cannot withhold certain documents from the public. The original exemption application (Form 1023 or 1023-EZ), all supporting documents, and the IRS determination letter must be open for public inspection. Annual returns and their schedules must be available for three years from the filing due date or the date filed, whichever is later.20Internal Revenue Service. Public Disclosure and Availability of Exempt Organizations Returns and Applications – Documents Subject to Public Disclosure
Ignoring a request costs $20 for each day the failure continues, up to $10,000 per return. For the exemption application, no maximum applies, so the meter runs indefinitely.21Internal Revenue Service. Public Disclosure and Availability of Exempt Organizations Returns and Applications – Penalties for Noncompliance Posting the Form 990 on the organization’s website or through a third-party database satisfies the disclosure requirement without fielding individual requests.
Illegal or Public-Policy-Violating Activities
Tax-exempt status requires that an organization serve the public interest, so it cannot pursue purposes that are illegal or contrary to established public policy. In Bob Jones University v. United States, the Supreme Court held that a university practicing racial discrimination in admissions did not qualify as “charitable” under the tax code, even though it was otherwise organized for educational purposes. An institution whose purpose runs against the common community conscience cannot claim the public benefit that justifies a tax subsidy.
The doctrine extends beyond discrimination. An organization that systematically violates laws as part of its operations, even one convinced of the moral rightness of its cause, is not operating for an exempt purpose. The federal government will not subsidize through tax exemption what it prohibits through other laws.