Form 990-T: Unrelated Business Income Tax Filing and Deadlines

Form 990-T is the federal tax return that tax-exempt organizations file to report and pay tax on income from commercial activities that are not related to their exempt purpose. Any exempt entity with at least $1,000 in gross income from such an activity must file one, and the tax exists to keep exempt organizations from undercutting for-profit competitors selling the same goods or services.¹ The list of filers is broader than most people realize: it includes charities and universities, but also pension trusts and individual retirement accounts.

Who Has to File

The $1,000 gross-income threshold applies to a long list of entities. If any of the following take in $1,000 or more from a regularly conducted unrelated trade or business, a 990-T is required:

Organizations exempt under Section 501(a), including 501(c)(3) charities, social welfare organizations, and trade associations.
State colleges and universities, along with their wholly owned subsidiaries.
Qualified tuition programs (529 plans) and ABLE programs (529A plans).
Employee benefit trusts described in Section 401(a).
Traditional, SEP, SIMPLE, and Roth IRAs.
Coverdell education savings accounts, Archer MSAs, and health savings accounts.

Each of those accounts is treated as its own trust for unrelated business taxable income (UBTI) purposes. If a single person owns two IRAs and both cross the threshold, each needs its own Employer Identification Number and its own return.²

Why IRA Owners Get Pulled In

Most IRA holders never encounter Form 990-T because ordinary stocks, bonds, and mutual funds produce passive income that is excluded from UBTI. The filing requirement surfaces when the account holds something that generates business income instead. The common triggers are units in a master limited partnership, which passes through operating income as UBTI, and self-directed IRAs holding leveraged real estate, where income from debt-financed property is partially taxable even inside a retirement account.¹ When an IRA receives a Schedule K-1 showing unrelated business income, the custodian or trustee is technically responsible for filing, but many custodians push the work to the account holder. Any resulting tax and penalties come out of the IRA itself.

What Counts as Unrelated Business Income

An activity produces UBTI only when it satisfies all three parts of a statutory test. The income must come from a trade or business, that business must be regularly carried on, and the activity must not be substantially related to the organization’s exempt purpose.³ Miss any one of the three and the income falls outside UBTI, no matter how commercial the activity looks.

The “regularly carried on” prong catches organizations that hold occasional events. A charity’s single weekend fundraiser with food sales is not regularly carrying on a food-service business. A café run by the same charity five days a week, year-round, almost certainly is. The IRS compares the frequency and manner of the activity to how a taxable business in the same field operates.

The “substantially related” prong is where most disputes happen. An activity is substantially related only when the commercial work itself contributes meaningfully to the exempt purpose. Using the profits for charitable programs does not count. A university press publishing scholarly research relates to the educational mission; leasing its printing equipment to outside businesses for profit does not.

Income That Is Excluded Anyway

Several categories of income stay outside UBTI even when the three-part test is met. The main passive-income exclusions are dividends, interest, annuities, royalties, rents from real property (as long as the rent is not tied to the tenant’s net profits), and capital gains from selling investments other than inventory.⁴

A separate set of exclusions turns on how the activity is conducted:

Work performed substantially by unpaid volunteers. A thrift store staffed entirely by volunteers does not produce UBTI.
Sales of donated merchandise, which covers most charity shops selling donated clothing and household items.
Activities carried on primarily for the convenience of an organization’s members, students, patients, or employees, such as a university dining hall or a hospital cafeteria.
Qualified research performed by a college, university, or hospital, along with research funded by the federal government or a state.

Debt-Financed Property Undoes the Passive Exclusions

The exclusions for rents, dividends, interest, and capital gains disappear to the extent the underlying property was purchased with borrowed money. A portion of the income from debt-financed property is pulled back into UBTI, calculated as the ratio of the average outstanding debt to the property’s average adjusted basis.⁵ If a charity buys a $1,000,000 building with a $600,000 mortgage, roughly 60% of the net rental income becomes UBTI. As the debt is paid down, the taxable share drops.

Qualified retirement trusts under Section 401(a), educational institutions described in Section 170(b)(1)(A)(ii), and their supporting organizations can hold debt-financed real property without triggering UBTI, subject to statutory conditions.⁶ IRAs do not get that exemption. A self-directed IRA that borrows to buy rental property will owe tax on a portion of the rent and on gain from any sale.

How the Tax Is Calculated

The calculation begins with gross income from each unrelated activity. Ordinary and necessary expenses directly connected to that activity come off the top: wages, cost of goods sold, depreciation on equipment used in the business, and similar costs. When facilities or staff serve both the exempt mission and the unrelated business, expenses have to be allocated between them on a reasonable basis. The IRS specifically warns that allocating by gross-revenue ratio is not reasonable when the cost of providing the service is similar but the prices charged differ between related and unrelated uses.²

After connected expenses, the organization subtracts a flat $1,000 specific deduction. If net unrelated business income comes in at $1,000 or less after expenses, no tax is owed, though the return still has to be filed if gross income hit the $1,000 threshold.⁴

Corporate Rate or Trust Rate

The rate depends on how the filer is organized. Entities structured as corporations, which includes most 501(c)(3) charities, pay the flat 21% corporate rate. Filers structured as trusts, including pension trusts and IRAs, pay at the graduated trust rates. Those trust brackets compress fast: for the 2026 tax year, the top rate of 37% kicks in above just $16,000 of taxable income. Even modest UBTI inside an IRA can hit high marginal rates.

Multiple Businesses Are Siloed

An organization running more than one unrelated business cannot net the results together. Since 2018, UBTI is computed separately for each unrelated trade or business, a rule commonly called siloing. A loss in one activity cannot offset income in another.⁷ The $1,000 specific deduction is applied once, after the separate calculations are combined, but net operating losses stay siloed and carry forward only against future income from the same activity.⁸ Carrybacks are no longer permitted for losses arising in tax years beginning after December 31, 2017, and carried-forward losses can offset only 80% of the current year’s taxable income from that activity.⁹

Deadlines and E-Filing

The due date depends on the type of filer. Employee benefit trusts under Section 401(a), IRAs (traditional, SEP, SIMPLE, and Roth), Coverdell ESAs, and Archer MSAs file by the 15th day of the 4th month after the tax year ends, which is April 15 for calendar-year filers. All other organizations file by the 15th day of the 5th month, making their deadline May 15.¹ If the date lands on a weekend or legal holiday, it moves to the next business day.

An automatic six-month extension is available by filing Form 8868 before the original due date. It extends the time to file, not the time to pay. Any tax owed is still due on the original deadline, and interest and penalties accrue on unpaid balances after that date.¹⁰

Paper filing is not an option. The IRS has required electronic filing of Form 990-T for tax years ending December 2020 and later.¹¹

Quarterly Estimated Payments

A filer expecting to owe $500 or more in unrelated business income tax for the year must make quarterly estimated payments. They are due on the 15th day of the 4th, 6th, 9th, and 12th months of the tax year (April 15, June 15, September 15, and December 15 for calendar-year filers) and must go through the Electronic Federal Tax Payment System.¹² Missing an estimated payment triggers a separate underpayment penalty on top of any other penalties.¹³

Penalties for Filing or Paying Late

The late-filing penalty is 5% of the unpaid tax for each month or partial month the return is overdue, capped at 25%. If the return is more than 60 days late, the minimum penalty is the lesser of the tax due or $525.²

A separate late-payment penalty of 0.5% per month runs on any unpaid tax, also capping at 25%. That rate doubles to 1% per month if the IRS issues a notice of intent to levy and the tax is still unpaid 10 days later.¹⁴

One boundary worth noting: skipping Form 990-T does not by itself cause automatic loss of tax-exempt status. Automatic revocation applies when an organization fails to file its annual information return (Form 990, 990-EZ, or 990-PF) for three consecutive years.¹⁵ The financial penalties are the direct exposure.

Public Disclosure for 501(c)(3) Filers

Organizations described in Section 501(c)(3) have to make their Form 990-T available for public inspection. The requirement covers the return and any schedules related to the unrelated business income tax, though attachments not connected to UBTI do not have to be disclosed. The organization must keep the return available for three years from the last day prescribed for filing, including extensions.¹⁶ Other exempt filers, such as social clubs and trade associations, are not subject to this disclosure rule for Form 990-T.

1
Internal Revenue Service. Instructions for Form 990-T (2025)
2
Internal Revenue Service. 2025 Instructions for Form 990-T
3
Legal Information Institute (LII). 26 USC 513(a) – Unrelated Trade or Business Definition
4
Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income
5
Internal Revenue Service. Unrelated Business Income From Debt-Financed Property Under IRC Section 514
6
Office of the Law Revision Counsel. 26 USC 514 – Unrelated Debt-Financed Income
7
Internal Revenue Service. FAQs – Carryback of NOLs by Certain Exempt Organizations
8
eCFR. 26 CFR 1.512(a)-6 – Special Rule for Organizations With More Than One Unrelated Trade or Business
9
Internal Revenue Service. Unrelated Business Taxable Income Computed Separately for Each Trade or Business – Siloing
10
Internal Revenue Service. Instructions for Form 8868 (Rev. January 2026)
11
Internal Revenue Service. E-File for Charities and Nonprofits
12
Internal Revenue Service. Estimated Tax: Unrelated Business Income
13
Internal Revenue Service. Publication 598 (03/2021), Tax on Unrelated Business Income of Exempt Organizations
14
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
15
Internal Revenue Service. Automatic Revocation of Exemption
16
Internal Revenue Service. Public Inspection and Disclosure of Form 990-T