Unrelated Business Income Tax for Nonprofits

What Unrelated Business Income Actually Means

A 501(c)(3) organization's income from activities related to its exempt purpose, such as a soup kitchen's donations or a museum's admission fees, is not taxed. Income from a separate commercial activity can be taxed, but only if it meets all three parts of the IRS's definition: it is income from a trade or business, the business is regularly carried on, and the activity is not substantially related to the organization's exempt purpose, per the IRS's unrelated business income tax guidance. Missing even one of these three elements means the income is not unrelated business income at all.

The "Regularly Carried On" Piece Matters

An activity that happens once a year, such as an annual gala or a single fundraising sale, is less likely to be treated as "regularly carried on" compared to an activity conducted with the frequency and continuity of a typical commercial business. A nonprofit bookstore open five days a week looks much more like a regularly carried on trade or business than a one-weekend rummage sale.

The "Substantially Related" Piece Is About the Activity, Not the Money

How the organization uses the income it earns does not matter for this test. A charity that runs an unrelated printing business and donates every dollar of profit to its charitable programs still owes UBIT on that income, because the activity itself, commercial printing, is not substantially related to its exempt purpose, even though the proceeds are used for good.

The $1,000 Filing Threshold

An organization with $1,000 or more of gross income from an unrelated business in a year must file Form 990-T, per the IRS. This is a reporting trigger, not a tax-free cushion; once the organization crosses $1,000 in gross unrelated business income, it generally owes tax on that income above its allowable deductions, calculated largely the same way a taxable corporation or trust would calculate its own tax.

Form 990-T Is Separate From Your Annual Return

Filing Form 990-T does not replace the organization's regular annual information return. The IRS is explicit that "the obligation to file Form 990-T is in addition to the obligation to file the annual information return, Form 990, 990-EZ or 990-PF." An organization with unrelated business income typically files both.

Estimated Tax Payments

If an organization expects its unrelated business income tax for the year to be $500 or more, it should make estimated tax payments during the year rather than waiting to pay everything when Form 990-T is filed, per the IRS. Underpaying estimated tax can result in a penalty even if the full amount is eventually paid.

Common Exceptions That Keep Income Out of UBIT

Several categories of income and activity are excluded from unrelated business income even when they otherwise look like a trade or business:

• Passive investment income, such as most dividends, interest, and royalties, and most rents from real property, unless the asset producing it was debt-financed
• Volunteer labor, when substantially all the work in carrying on the business is performed by volunteers
• Convenience activities, such as a hospital cafeteria run primarily for the convenience of patients, visitors, and staff rather than the general public
• Donated merchandise, such as a thrift shop selling items that were substantially all donated to the organization

Each exception has its own specific conditions, so an activity that looks similar to one of these examples is not automatically excluded without checking the details.

Why This Doesn't Usually Threaten Tax-Exempt Status

Owing UBIT on a side activity does not, by itself, put an organization's 501(c)(3) status at risk. The bigger risk arises if unrelated business activity grows so large that it becomes the organization's primary activity, which can call into question whether the organization is still operated primarily for its exempt purpose at all, separate from the tax owed on the income itself.

Track Unrelated Activities Separately From the Start

Set up separate accounting codes for any activity that might generate unrelated business income as soon as you start it, rather than trying to reconstruct the numbers at tax time. This makes both the $1,000 threshold determination and the eventual Form 990-T preparation much easier.

An Exception Can Turn on a Small Fact

Whether an activity qualifies for the volunteer-labor, convenience, or donated-merchandise exception often depends on a specific fact, such as what share of labor is actually volunteer versus paid, or who the activity's customers actually are. Document these facts at the time rather than relying on a general impression later.

State Tax Treatment Can Differ

Federal UBIT rules do not automatically determine your state income tax treatment of the same activity. Check your state's specific rules for unrelated business income, since some states tax it differently or require a separate state filing alongside Form 990-T.

A Growing Side Business Deserves a Second Look

If an unrelated activity is becoming a larger and larger share of the organization's total revenue or staff time, treat that as a prompt to revisit whether the organization's overall activities still support its exempt purpose, not just whether UBIT is being paid correctly on the activity itself.

This Is Not Tax Advice

Applying the three-part unrelated business income test, and confirming whether a specific exception applies, is fact-specific. A tax professional experienced with exempt organizations can review your actual activities and help you file Form 990-T correctly if it is required.