IRS Publication 598: Unrelated Business Income Tax Explained

IRS Publication 598 explains the Unrelated Business Income Tax (UBIT), the federal income tax that tax-exempt organizations owe on net profits from business activities outside their exempt mission. The rules exist to keep exempt groups from underpricing for-profit competitors in the same line of work. Tax applies only to net income, the first $1,000 is shielded by a specific deduction, and a filing is required once gross unrelated income reaches $1,000 in a year.

Which Organizations Are Covered

Almost every entity exempt under Section 501(a) falls within UBIT’s scope: 501(c)(3) charities, schools, hospitals, 501(c)(4) social welfare organizations, labor unions, trade associations, and state colleges and universities.¹ Qualified retirement trusts under Section 401(a) and individual retirement arrangements are also subject to UBIT when their investments produce the wrong kind of income.²

Churches are not automatically outside the rules. A church that runs a commercial business unrelated to its religious mission owes the same tax any other exempt organization would. Churches with no unrelated activity simply never file.

Earning unrelated business income does not, by itself, put an exemption at risk. The tax targets the income from the unrelated activity. Losing exempt status is a separate question that arises only when unrelated activity grows so large that the organization is no longer operating primarily for its exempt purpose.

The Three-Part Test

Income is treated as unrelated business income only when all three of the following are true. Fail any one, and the income falls outside UBIT.³

The activity is a trade or business, meaning its primary purpose is generating income by selling goods or services.
It is regularly carried on with the frequency and continuity a for-profit competitor would show. A one-weekend fundraiser is not; a year-round parking operation is.
It is not substantially related to the exempt purpose. The fact that profits fund the mission is irrelevant. The activity itself has to advance the purpose.

A university parking garage open to the public year-round hits all three and produces taxable income. A museum gift shop selling books and reproductions tied to its collection generally fails the third element because the merchandise itself furthers the museum’s educational purpose.

Activities the Statute Carves Out

Several categories are removed from the definition of an unrelated trade or business even when the three-part test would otherwise be met.³

Volunteer Labor

If substantially all the work is done by unpaid volunteers, the income is not unrelated business income. A charity thrift store staffed almost entirely by volunteers is the classic example, no matter how commercial the storefront looks.

Convenience of Members

For 501(c)(3)s and certain colleges and universities, a business run primarily for the convenience of members, students, patients, officers, or employees is excluded. Campus bookstores, hospital cafeterias, and university laundry services fit here. The activity must exist mainly to serve the organization’s own people, not the public.

Donated Merchandise

Selling goods that were substantially all received as gifts is excluded. This is the rule that protects thrift shops built on donated inventory.

Qualified Sponsorship Payments

Corporate sponsorships are excluded when the sponsor gets nothing beyond name or logo recognition. Once the arrangement adds advertising features such as comparative language, pricing, endorsements, or calls to action, the payment loses protection. Payments contingent on attendance figures or broadcast ratings also fall outside the exclusion.⁴

Bingo Games

Traditional live bingo is excluded if the game complies with state and local law and bingo is not regularly run by for-profit businesses in the same jurisdiction. The winner must be determined in front of all players. Pull-tabs, scratch-offs, and instant bingo do not qualify because the outcome is fixed when the card is printed.⁵

Trade Shows

Organizations under Sections 501(c)(3), (4), (5), or (6) can exclude income from industry trade shows designed to display products, stimulate demand, or educate attendees, provided the show is held in conjunction with a convention or annual meeting and trade show promotion is one of the sponsoring organization’s substantial exempt purposes.⁶

Passive Investment Income

Section 512(b) pulls several categories of investment income out of the UBTI calculation, even when the source technically looks unrelated.⁷

Dividends, interest, and annuities are excluded along with directly connected deductions.
Royalties are excluded however they are measured.
Rents from real property are excluded as long as the rent is not tied to the tenant’s income or profits. Rent for personal property leased with the real property is also excluded if it is an incidental share of total rent; if personal property rent exceeds 50 percent of the total, the entire rental exclusion is lost.
Capital gains are excluded unless the property is inventory or held primarily for sale to customers.

Research income gets its own treatment. Colleges, universities, and hospitals can exclude income from all research. Other exempt organizations can exclude only research whose results are freely available to the public.⁸

Debt-Financed Property Overrides the Exclusion

When borrowed money is used to acquire or improve income-producing property, Section 514 pulls a proportionate share of the resulting income back into UBTI.⁹ The taxable share equals the ratio of average outstanding debt to the property’s average adjusted basis. Buy a $1 million building with $400,000 borrowed, collect $100,000 in rent, and roughly 40 percent of that rent (around $40,000) becomes UBTI. The same 40 percent applies to allowable deductions.

Acquisition indebtedness covers the mortgage used to buy the property, debt incurred to improve it, and pre-existing debt that would not have been taken on without the acquisition. Whether later borrowing was reasonably foreseeable at purchase is a facts-and-circumstances call.¹⁰ Organizations often miss this: rental income they assumed was excluded partially flows back into UBTI because of the mortgage on the building.

Payments From Controlled Entities

The passive exclusions also break down when the payer is a subsidiary the exempt organization controls, meaning more than 50 percent by vote, value, or beneficial interest. Under Section 512(b)(13), interest, rent, royalties, or annuities from a controlled entity are included in the parent’s UBTI to the extent the payment exceeds an arm’s-length amount under Section 482. Above-market payments also carry a 20 percent penalty on the excess.¹¹

Advertising Income

Selling ad space in a magazine, journal, or newsletter is one of the most common UBIT triggers. The IRS treats advertising as a separate trade or business from the editorial content, even when the articles directly advance the exempt purpose.¹² Gross ad revenue is measured against direct ad costs. When advertising runs at a loss, the loss can offset circulation income only to the extent the publication itself is profitable; it cannot create or enlarge a net operating loss for UBTI purposes.

The Silo Rule for Multiple Businesses

Since 2018, Section 512(a)(6) has required each unrelated trade or business to be computed as its own silo. Income, deductions, and net operating losses stay within that silo.¹³ A loss from one activity can no longer wipe out a gain from another. If one business earns $50,000 and another loses $30,000, tax is owed on the full $50,000, and the $30,000 loss carries forward only within its own silo.¹⁴

Total UBTI on Form 990-T is the sum of positive silo amounts (no silo goes below zero) minus the single $1,000 specific deduction. This trips organizations up more than almost any other rule. A university with a profitable parking operation and a money-losing fitness center can no longer net the two.

Calculating UBTI and the Tax Rate

Start with gross income from each unrelated trade or business, subtract directly connected expenses, and apply the passive income and debt-financed adjustments. Where facilities or staff serve both the exempt function and the unrelated business, deductions must be reasonably allocated between them.¹⁵

After summing the silos, subtract the $1,000 specific deduction. Organizations with less than $1,000 in net unrelated income owe no tax. For churches and religious orders, each local unit (parish, district, or individual church) gets its own $1,000 deduction, capped at that unit’s gross unrelated income.¹⁶

Exempt organizations structured as corporations pay at the flat 21 percent corporate rate under Section 11. Trusts, including IRAs, pay at graduated trust rates that reach the top bracket much sooner than individual rates.¹⁷

Filing Form 990-T

Any exempt organization with $1,000 or more in gross unrelated business income has to file Form 990-T, Exempt Organization Business Income Tax Return. The filing threshold looks at gross income, not net. An activity that brings in $5,000 and spends $6,000 still requires a return even though no tax is owed.²

Exempt organizations taxed as corporations file by the 15th day of the 4th month after the end of the tax year (April 15 for calendar-year filers). Trusts also file by the 15th day of the 4th month, with extensions available. Form 990-T must be filed electronically; paper is not an option for organizations subject to Section 511.¹⁸

Expected UBIT of $500 or more for the year triggers quarterly estimated payments, using Form 990-W as a worksheet. Missing an installment can produce underpayment penalties even when the full balance is paid at filing.¹⁹

A common mistake is skipping the return on small amounts. The $1,000 specific deduction often erases the tax, but the $1,000 gross income threshold is a separate filing test. An organization with $1,200 in gross unrelated income and $800 in expenses still has to file, even though the resulting $400 falls below the deduction and produces no tax.

UBIT Inside an IRA

IRAs are exempt under Section 501(a), which puts them under the same UBIT rules. Traditional holdings such as stocks, bonds, and mutual funds throw off dividends, interest, and capital gains, all covered by the passive exclusions. Trouble tends to come from partnership investments: master limited partnerships, publicly traded partnerships, private equity funds, and some hedge funds can pass UBTI through to the IRA, especially when the partnership borrows to invest.

When gross UBTI inside an IRA reaches $1,000 or more, the custodian (or the account holder, depending on the custodian’s policies) has to file Form 990-T and pay any tax out of IRA assets, not personal funds.² Many account holders discover the obligation only when a K-1 arrives showing UBTI. It is worth checking the structure of any alternative investment before buying it inside a retirement account.

1
Office of the Law Revision Counsel. 26 U.S. Code 501 – Exemption From Tax on Corporations, Certain Trusts, Etc.
2
Internal Revenue Service. Unrelated Business Income Tax
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Office of the Law Revision Counsel. 26 USC 513 – Unrelated Trade or Business
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Office of the Law Revision Counsel. 26 USC 513 – Unrelated Trade or Business – Section 513(i)
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Internal Revenue Service. Exclusion of Bingo From Unrelated Business Activity
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Office of the Law Revision Counsel. 26 USC 513 – Unrelated Trade or Business – Section 513(d)
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Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income – Section 512(b)
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Internal Revenue Service. Unrelated Business Income Tax Exceptions and Exclusions
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Office of the Law Revision Counsel. 26 USC 514 – Unrelated Debt-Financed Income
10
eCFR. 26 CFR 1.514(c)-1 – Acquisition Indebtedness
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Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income – Section 512(b)(13)
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Internal Revenue Service. Advertising Unrelated Business Taxable Income and 3rd Party Contractor Issues
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Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income – Section 512(a)(6)
14
Internal Revenue Service. FAQs – Carryback of NOLs by Certain Exempt Organizations
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Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income
16
Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income – Section 512(b)(12)
17
Office of the Law Revision Counsel. 26 U.S. Code 511 – Imposition of Tax on Unrelated Business Income of Charitable, Etc., Organizations
18
Internal Revenue Service. Instructions for Form 990-T (2025)
19
Internal Revenue Service. Estimated Tax: Unrelated Business Income