Form 990-W Instructions: UBTI, Payments, and Underpayment

Form 990-W is the IRS worksheet a tax-exempt organization uses to figure the estimated tax it owes on unrelated business income during the year. You fill it out if you expect to owe $500 or more in unrelated business income tax, use the numbers to make four quarterly payments, and keep the worksheet itself in your records rather than mailing it in.¹ The payments are what the IRS sees. Miss them, and penalties compound each quarter you’re short.

Who Needs to Use the Worksheet

Any organization exempt under Internal Revenue Code Section 501(a) that earns income from a trade or business unrelated to its exempt purpose may owe Unrelated Business Income Tax. That covers 501(c)(3) charities, 501(c)(6) trade associations, most other 501(c) entities, and state colleges, universities, and their wholly owned subsidiaries.² Exempt trusts, including IRAs, SEP IRAs, SIMPLE IRAs, Roth IRAs, Coverdell education savings accounts, Archer MSAs, and health savings accounts, are also subject to the tax on any unrelated business income they generate.³

Estimated payments become mandatory once your projected liability for the year reaches $500. Below that, no quarterly payments are required, though you may still owe a Form 990-T at year-end if your gross unrelated business income hits $1,000.⁴ Those two thresholds do different jobs and don’t move together.

Private foundations also use Form 990-W, but for a different tax: estimated excise tax on net investment income under IRC Section 4940. The worksheet mechanics look similar; the underlying tax is not the same.

Estimating Unrelated Business Taxable Income

The heart of the worksheet is your projection of Unrelated Business Taxable Income for the year. UBTI comes from any trade or business that is regularly carried on and not substantially related to your exempt purpose. Typical examples include advertising revenue in a nonprofit publication, a museum gift shop selling merchandise unrelated to its exhibits, or a university parking garage open to the public. Start with gross income from those activities, then apply the exclusions and deductions the code allows.

What Comes Out of the Calculation

Several categories of passive income are carved out of UBTI. Dividends, interest, annuities, and royalties are excluded, along with any deductions directly connected to earning them. Rents from real property are excluded too, but that exclusion falls away if the rent depends on the tenant’s income or profits (other than a fixed percentage of receipts), or if more than half the total rent comes from personal property bundled into the lease.⁵ Gains and losses from selling property are generally excluded, unless the property was held primarily for sale to customers.

Debt-financed property overrides all of that. If your organization borrowed money to acquire an investment, the income from that investment gets pulled back into UBTI in proportion to the outstanding debt, even when it would otherwise qualify as excluded dividends, interest, or rent.⁵ Review each investment when you’re estimating; a mortgage or margin loan can convert quiet passive income into taxable income.

Siloing Multiple Activities

Organizations running more than one unrelated trade or business must compute UBTI separately for each activity. This is the “siloing” rule under IRC Section 512(a)(6). A loss from one unrelated business cannot offset income from another. Each activity’s UBTI is figured on its own, floors at zero, and the results are added together before you apply the $1,000 specific deduction.⁵ Activities are typically classified by two-digit NAICS code, and the classification must stay consistent from year to year.

Net Operating Losses

A prior-year loss from an unrelated business can reduce the current year’s UBTI from the same activity. For losses arising in tax years beginning after December 31, 2017, the deduction is capped at 80% of the current year’s taxable income computed before the NOL deduction.⁶ Post-2017 losses carry forward indefinitely but cannot be carried back, and under siloing they can only offset income from the same activity that produced the loss. Older losses, from tax years beginning before January 1, 2018, are not subject to the 80% cap and should be applied first.

Deductions and the $1,000 Specific Deduction

Ordinary business expenses directly connected to an unrelated activity are deductible against that activity’s income: salaries, supplies, depreciation, rent on space used for the activity. Expenses shared between exempt and unrelated activities need a reasonable allocation. Charitable contributions are deductible whether or not they connect to the unrelated business. After all modifications and deductions, subtract a flat $1,000 specific deduction from aggregate UBTI.⁵ The $1,000 is left out when computing NOLs, so it can’t be used to build a larger loss.

Applying the Tax Rate

Most exempt organizations use the flat 21% corporate rate on estimated UBTI, because IRC Section 511(a) taxes unrelated business income at the same rates that apply to regular corporations.⁷ Exempt trusts are the exception. They use the trust and estate rate schedule, whose compressed brackets reach 37% at fairly low income levels.⁸

Subtract any estimated credits you expect to claim, such as the general business credit. If the net result is under $500, you’re done and no quarterly payments are required.

Figuring the Required Annual Payment

The required annual payment is the lesser of two amounts: 100% of the current year’s estimated net tax liability, or 100% of the tax shown on your prior year’s Form 990-T, provided the prior year was a full 12-month period and showed a tax liability greater than zero.¹ The prior-year figure is a safe harbor: match what you owed last year and you’re protected even if this year turns out higher.

A separate rule applies to large organizations. An organization is “large” if it or a predecessor had taxable income of $1,000,000 or more in any of the three tax years immediately preceding the current year. Large organizations can use the prior-year safe harbor only for the first installment. Every remaining installment must be based on 100% of the current year’s estimated tax, and any shortfall created by using the prior-year method on installment one gets added to installment two.⁹

Once you’ve settled on the required annual payment, divide by four. Each quarterly installment is 25% of that amount.

Annualized Income for Uneven Revenue

If your unrelated business income doesn’t arrive evenly, equal quarterly payments can force you to pay tax on money you haven’t earned yet. The annualized income installment method bases each installment on income actually received through that quarter, then annualizes it to project full-year liability.¹⁰

The first and second installments use only the first three months of income. The third uses six months, the fourth uses nine. Each period’s income is projected to a full year, the applicable percentage (25%, 50%, 75%, 100%) is applied, and prior installments already paid are credited against the result.¹⁰ You pay the lesser of the regular installment or the annualized installment each quarter, and any reduction gets recaptured later, so timing shifts rather than tax disappears. If you use this method, attach Form 2220 to Form 990-T at year-end to show the IRS how each installment was figured.

Payment Due Dates and How to Pay

Installments are due on the 15th day of the 4th, 6th, 9th, and 12th months of your organization’s tax year. For a calendar-year organization:

First installment: April 15
Second installment: June 15
Third installment: September 15
Fourth installment: December 15

Fiscal-year organizations follow the same pattern from the start of their own tax year. An organization with a July 1 fiscal year owes installments on October 15, December 15, March 15, and June 15. When a due date lands on a weekend or federal holiday, it moves to the next business day.

The IRS expects corporate estimated tax payments through the Electronic Federal Tax Payment System.¹¹ EFTPS is free and handles income, employment, estimated, and excise tax payments. You can also pay through your IRS business tax account or by direct pay. Form 990-W itself never goes to the IRS; only the money does, and it needs to arrive by the deadline no matter when the worksheet was completed.

What Happens If You Underpay

Missing an installment or paying less than the required amount triggers an underpayment penalty computed on Form 2220. The penalty runs from the installment due date until the earlier of the date you actually pay or the due date of the annual return. The IRS sets the rate quarterly based on the federal short-term rate, so the cost of being late depends on when the shortfall sits.¹²

The penalty doesn’t apply if your total tax for the year comes in under $500. You can also reduce or eliminate the penalty by showing that you used the annualized income installment method or the adjusted seasonal installment method and that your payments matched what those methods required. Both alternatives are calculated on Form 2220 and attached to Form 990-T. For tax years beginning in 2025, Notice 2025-27 offers a specific waiver for penalties tied to the Corporate Alternative Minimum Tax; affected organizations still file Form 2220 and exclude the CAMT liability from the required annual payment calculation.¹³

Mistakes That Cost Organizations Money

The most frequent error is treating all unrelated business activities as a single pool. Under siloing, losses from one activity cannot offset income from another. Combine everything and you’ll understate estimated tax, then face a penalty when you actually file Form 990-T.⁵

Confusing the $1,000 filing threshold with the $500 estimated tax threshold is another recurring problem. Form 990-T is required once gross unrelated business income reaches $1,000; estimated payments aren’t required unless the tax liability itself hits $500.⁴ An organization with $1,200 in gross unrelated income might owe no tax at all after deductions and the specific deduction, yet still owe a return.

Organizations also forget that debt-financed income overrides the passive-income exclusions. Dividends from stock bought with borrowed funds, or rent from real property carrying a mortgage, can land in UBTI even though dividends and real property rents are normally excluded.

And watch the large-organization rule. If taxable income exceeded $1,000,000 in any of the prior three years, the prior-year safe harbor is gone after the first installment.⁹ Organizations that keep using last year’s tax as the benchmark for all four installments end up with a penalty on the second, third, and fourth payments even though the first was fine.

1
Internal Revenue Service. Estimated Tax: Unrelated Business Income
2
Office of the Law Revision Counsel. 26 U.S. Code 501 – Exemption From Tax on Corporations, Certain Trusts, Etc.
3
Internal Revenue Service. Instructions for Form 990-T (2025)
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Internal Revenue Service. Unrelated Business Income Tax
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Office of the Law Revision Counsel. 26 USC 512 – Unrelated Business Taxable Income
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Office of the Law Revision Counsel. 26 U.S. Code 172 – Net Operating Loss Deduction
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U.S. Government Publishing Office. 26 U.S.C. 511 – Imposition of Tax on Unrelated Business Income of Charitable, Etc., Organizations
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Internal Revenue Service. Unrelated Business Income Tax Returns
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Office of the Law Revision Counsel. 26 U.S. Code 6655 – Failure by Corporation to Pay Estimated Income Tax
10
eCFR. 26 CFR 1.6655-2 – Annualized Income Installment Method
11
Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System
12
Internal Revenue Service. Quarterly Interest Rates
13
Internal Revenue Service. Instructions for Form 2220