Nonprofit and Tax-Exempt Organization Taxes: 501(c)(3) Rules Explained

Business Taxes · TAX GUIDE

How tax-exempt organizations are taxed — applying for 501(c)(3) status, the annual Form 990, unrelated business income tax (UBIT), and the rules nonprofits must follow to keep their exemption.

Tax-exempt doesn't mean tax-free or paperwork-free. Nonprofits and other tax-exempt organizations enjoy major benefits — exemption from federal income tax and the ability to receive deductible donations — but they operate under strict rules. Falling out of compliance can mean losing exempt status entirely. Whether you're starting a charity or sitting on a board, understanding these obligations is essential.

How Tax Exemption Works

A tax-exempt organization is generally exempt from federal income tax on income related to its exempt purpose. The best-known category is 501(c)(3) — charitable, religious, and educational organizations — but there are dozens of other exempt categories (social welfare groups, trade associations, social clubs, and more). Exemption is not automatic: most organizations must apply to the IRS and be recognized.

Applying for 501(c)(3) Status

To become a recognized charity, an organization typically forms as a nonprofit corporation under state law, then applies to the IRS using Form 1023 (or the streamlined 1023-EZ for smaller groups). Approval grants exemption from federal income tax and — uniquely for 501(c)(3)s — lets donors deduct their contributions. The application requires detailed information about the organization's purpose, governance, and finances.

The Annual Form 990

Most tax-exempt organizations must file an annual information return — Form 990, 990-EZ, or 990-N depending on size. Form 990 is public, so it doubles as a transparency document donors and watchdogs review. Failing to file for three consecutive years results in automatic revocation of exempt status — one of the most common ways small nonprofits lose their exemption by accident.

Unrelated Business Income Tax (UBIT)

Even exempt organizations pay tax on income from a trade or business that isn't related to their exempt purpose. This 'unrelated business income tax' (UBIT) prevents nonprofits from unfairly competing with taxable businesses. For example, a museum's gift shop sales tied to its mission may be exempt, while unrelated advertising revenue may be taxable. Organizations with significant unrelated income file Form 990-T.

Rules That Protect Exempt Status

To keep their exemption, 501(c)(3)s must operate exclusively for exempt purposes, avoid private benefit and 'inurement' (insiders profiting), strictly limit lobbying, and avoid political campaign activity entirely. Excess benefit transactions can trigger penalty taxes on both the insider and the organization's managers. Strong governance and good records are the best defense.

Frequently Asked Questions

Are nonprofits completely tax-free?

No. They're exempt from federal income tax on mission-related income, but they can owe tax on unrelated business income and must still handle payroll taxes and annual filings.

How does an organization become a 501(c)(3)?

It forms as a nonprofit under state law and applies to the IRS using Form 1023 or 1023-EZ. Once recognized, it's exempt from income tax and donors can deduct contributions.

What is Form 990?

It's the annual information return most tax-exempt organizations file. It's public, and failing to file for three years in a row automatically revokes exempt status.

What is UBIT?

Unrelated business income tax — tax a nonprofit owes on income from a trade or business unrelated to its exempt purpose, reported on Form 990-T.

Can a nonprofit endorse political candidates?

No. 501(c)(3) organizations are prohibited from political campaign activity and may only conduct limited lobbying. Violations can cost the organization its exemption.