Form 990-T is the federal return that tax-exempt organizations, IRAs, and employer retirement plans use to report and pay tax on unrelated business taxable income (UBTI). If you’ve seen “99T” on a statement or transcript, it points to a liability reported on this form rather than a separate IRS code. The filing obligation kicks in once gross unrelated business income for the year reaches $1,000, and the tax rates run from 10% to 37% for trusts (including IRAs) or a flat 21% for exempt organizations taxed as corporations.
Who Has to File
Any exempt entity with $1,000 or more in gross unrelated business income during the tax year must file. That threshold looks at gross receipts before deductions, so a small net number, or even a net loss, doesn’t get you out of filing once gross income crosses the line.
The entities that may owe include:
- Nonprofits described in Section 501(c), including 501(c)(3) charities and 501(c)(4) social welfare organizations, when they run an unrelated trade or business.
- Traditional and Roth IRAs, each treated as a separate trust with its own Employer Identification Number for filing purposes.
- Section 401(a) trusts, which includes 401(k) plans.
For IRAs, the trustee or custodian files the return, not the account owner. The return goes in under the IRA trust’s EIN, not your Social Security number and not the custodian’s own EIN. Your job as the account holder is to make sure any Schedule K-1 or similar notice from an investment reaches the custodian in time to prepare the filing.
What Triggers the Tax
Most passive investment income earned inside an exempt account stays tax-free. Dividends, interest, capital gains, royalties, most rents from real property, and annuities are all excluded from UBTI when the investment isn’t debt-financed. That covers ordinary stock and bond portfolios.
The income that does trigger UBTI usually falls into a handful of categories that IRA holders run into most:
- Master limited partnerships. MLPs, common in the energy sector, are publicly traded partnerships whose operating income flows through to unitholders. Your IRA’s share of that operating income is UBTI. This is the single most common source for individual retirement accounts.
- Other pass-through businesses. Limited partnerships, LLCs taxed as partnerships, and similar structures pass active business income through to the IRA as a partner.
- Debt-financed investments. When an IRA borrows to buy an asset, a portion of the income from that asset becomes taxable under IRC Section 514, even if the income type (like real estate rent) would normally be excluded. The taxable percentage equals average acquisition indebtedness divided by average adjusted basis, and it shrinks as the debt is paid down. This most often affects self-directed IRAs holding leveraged real estate.
- Private equity and hedge funds structured as limited partnerships, particularly when the fund uses leverage or operates businesses directly.
The statutory test asks whether the income comes from a trade or business regularly carried on that isn’t substantially related to the account’s exempt purpose. For an IRA, essentially any active business income qualifies, because an IRA’s exempt purpose is holding retirement savings rather than running businesses.
Buying stocks and bonds on margin flips normally excluded income into partially taxable income the same way real estate leverage does. If avoiding UBTI matters to you, sticking with conventional unleveraged holdings is the cleanest route.
How the Tax Is Calculated
Rates depend on entity type. Exempt organizations taxed as corporations pay a flat 21%. Trusts, including IRAs and most retirement accounts, pay at the graduated trust and estate rates. For 2026:
- 10% on taxable income up to $3,300
- 24% on income from $3,301 to $11,700
- 35% on income from $11,701 to $16,000
- 37% on income above $16,000
The brackets compress quickly. An IRA with just $16,001 in net UBTI already hits the top 37% rate, the same top rate individuals pay at much higher income levels.
Before the rates apply, IRC Section 512(b)(12) gives a specific deduction of $1,000. So if net UBTI from all sources comes in at $1,000 or less, no tax is actually owed, even though the return still has to be filed once gross income crosses the $1,000 filing threshold. The specific deduction and the filing threshold are separate rules that happen to share the same dollar figure.
Each Activity Stands Alone
Under IRC Section 512(a)(6), each unrelated trade or business calculates its UBTI separately. If your IRA holds two MLPs and one produces a loss while the other produces income, the loss can’t offset the income. Each activity is its own silo, including for net operating loss purposes. The rule applies for tax years beginning after December 31, 2017.
Filing Deadlines
The due date depends on the filer:
- IRAs and Section 401(a) trusts (including 401(k) plans): April 15 for a calendar tax year.
- Other exempt organizations: the 15th day of the 5th month after the tax year ends, which is May 15 for calendar-year filers.
Filing Form 8868 before the original deadline grants an automatic six-month extension, pushing an IRA’s deadline to October 15. The extension buys time to file, not time to pay. Estimated tax owed still has to be paid by the original date to avoid interest and late-payment penalties.
Form 990-T must be filed electronically for tax years ending December 2020 and later. Paper filing is no longer accepted. IRA custodians generally handle the e-filing, but with a self-directed IRA, confirm that your custodian or preparer will submit through an authorized e-file provider.
Estimated Tax Payments
If UBTI tax for the year is expected to be $500 or more, quarterly estimated payments are required. Form 990-W is the worksheet. Calendar-year due dates are:
- First quarter (January–March): April 15
- Second quarter (April–May): June 15
- Third quarter (June–August): September 15
- Fourth quarter (September–December): January 15 of the following year
Estimated payments go through the Electronic Federal Tax Payment System (EFTPS). Missing them, or underpaying, triggers a separate penalty on top of any tax owed with the return. The safe harbor is paying the lesser of the current year’s tax or 100% of the prior year’s tax, spread across the four installments.
Penalties
Late filing and late payment carry separate penalties, and they can stack.
- Late filing: 5% of the unpaid tax for each month or partial month the return is overdue, capped at 25%. For returns filed more than 60 days late, the minimum penalty is the lesser of $525 or the total tax due, with that $525 floor applying to returns due after December 31, 2025.
- Late payment: 0.5% of the unpaid tax per month, also capped at 25%, running from the original due date until the balance is paid.
When both apply, the late-filing penalty is reduced by the late-payment amount, so the combined charge during the first five months is 5% per month rather than 5.5%. Once late filing tops out at 25%, the late-payment penalty continues on its own.
The most expensive scenario is nonfiling. If your custodian doesn’t know an investment generated UBTI, no return goes in and penalties accrue quietly. Reviewing K-1s each year and forwarding them to the custodian is the simplest safeguard.
What to Have Ready
Before the deadline, gather:
- Every Schedule K-1 issued to the account, showing the account’s share of income, deductions, and credits from each partnership or pass-through investment.
- The account’s EIN. Each IRA that files needs its own; the custodian can apply using Form SS-4 if one hasn’t been assigned.
- Trustee or custodian information, which the return must identify.
For exempt organizations, the requirements are the same in substance: K-1s from partnerships, the organization’s EIN, and records of any directly operated unrelated business.
One Boundary Worth Knowing
Section 501(c)(3) charities have to make their filed Form 990-T available for public inspection under IRC Section 6104(d), including schedules and supporting documents related to the unrelated business income tax. The rule covers returns filed after August 17, 2006, with limited exceptions for certain foreign-entity attachments and reportable transactions. Other exempt organizations, and all retirement accounts, are not subject to this disclosure rule. An IRA’s Form 990-T is not a public document.