Form 8991 is the IRS form a U.S. corporation uses to determine whether it owes the Base Erosion and Anti-Abuse Tax (BEAT) under IRC Section 59A. The form applies to large corporations that make deductible payments (interest, royalties, service fees, rent, and certain purchases of depreciable property) to foreign related parties. If your average annual gross receipts hit $500 million and enough of your deductions flow to foreign affiliates, you file Form 8991 with your Form 1120 and pay the BEAT if the recalculation shows a shortfall against a minimum tax floor. The current BEAT rate is 10.5% of modified taxable income, or 11.5% if your group includes a bank or a registered securities dealer.
Who Has to File
Two tests decide whether your corporation is an “applicable taxpayer” that owes the BEAT. You have to clear both. But you may still need to file the form after clearing only one.
The Gross Receipts Test
Average annual gross receipts over the three tax years ending with the prior year must reach $500 million.1Office of the Law Revision Counsel. 26 USC 59A – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts Gross receipts include total sales (net of returns), service revenue, and investment income. For sales of capital assets or business-use property, receipts are reduced by the adjusted basis in the property sold.
The threshold applies at the aggregate group level, not the entity level. Aggregation under IRC Section 52 treats all members of a controlled group of corporations as a single employer, so their gross receipts are combined.2Office of the Law Revision Counsel. 26 US Code 52 – Special Rules A foreign corporation joins the aggregate group if it has income effectively connected with a U.S. trade or business.
The Base Erosion Percentage Test
Divide your total base erosion tax benefits (the deductible amounts tied to payments to foreign related parties) by aggregate deductions allowable for the year. The denominator excludes deductions under Section 172 (net operating losses), Section 245A (the participation exemption for foreign dividends), and Section 250 (GILTI and FDII deductions).1Office of the Law Revision Counsel. 26 USC 59A – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts Cost of goods sold isn’t in the denominator either, because it reduces gross income rather than creating a deduction.
The threshold is 3%. It drops to 2% if your aggregate group includes a bank or a registered securities dealer.3Internal Revenue Service. IRC 59A Base Erosion Anti-Abuse Tax Overview
Exclusions and Partial Filing
Regulated investment companies, real estate investment trusts, and S corporations are carved out of the applicable taxpayer definition entirely.1Office of the Law Revision Counsel. 26 USC 59A – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts Those entities don’t file Form 8991 even if they belong to a group above $500 million.
If you clear the Gross Receipts Test but fall short of the base erosion percentage, you still file. Part I of the form documents the non-applicability.4Internal Revenue Service. Instructions for Form 8991 Fall short of $500 million at the aggregate group level and no filing is required.
What Counts as a Base Erosion Payment
A base erosion payment is any amount paid or accrued by a U.S. taxpayer to a foreign related party that generates a deduction. The usual suspects are interest to a foreign parent, royalties for intellectual property licensed from a foreign affiliate, rent on equipment owned overseas, and management or technical service fees.
Purchases of depreciable or amortizable property from a foreign related party work differently. The base erosion payment is the full purchase price, but the base erosion tax benefit is the annual depreciation or amortization deduction. The add-back to modified taxable income happens gradually over the asset’s useful life, not all at once.
Exclusions
Payments already subject to U.S. withholding under Sections 871 or 881 (the 30% rate on U.S.-source income paid to foreign persons) are not base erosion payments.5Office of the Law Revision Counsel. 26 US Code 881 – Tax on Income of Foreign Corporations Not Connected With United States Business If the payment is already taxed here, the base-erosion concern falls away. Amounts properly included in cost of goods sold are also excluded.
Low-margin services can qualify under the Services Cost Method (SCM) exception. If the service is eligible for the SCM under the Section 482 transfer pricing rules (without relying on the business judgment rule), the cost component is excluded from base erosion payments, even if you priced the transaction under a different method.6Internal Revenue Service. IRS Chief Counsel Advice 202529008 – Services Cost Method Exception for Purposes of Section 59A(d)(5) Only the cost portion is carved out. Any markup above total services cost remains a base erosion payment, so documentation has to separate cost from profit.7eCFR. 26 CFR 1.482-9 – Methods to Determine Taxable Income in Connection With a Controlled Services Transaction
Qualified derivative payments are also excluded when the payment is marked to market or on accrual for tax and the foreign recipient recognizes the income in its home jurisdiction. The exception doesn’t apply if the payment would otherwise be characterized as interest, royalties, or rent, or if the arrangement is designed to sidestep the BEAT.
Calculating the BEAT
The BEAT calculation is a comparison. Your “tentative BEAT” is measured against your adjusted regular tax liability, and you owe the difference only if the tentative amount is higher. Part III of the form ties this together.
Modified Taxable Income
Start with regular taxable income under Section 63 and add back every base erosion tax benefit for the year: deductions for interest, royalties, service fees, and any other qualifying payments, plus the depreciation or amortization from property acquired from foreign related parties in current or prior years.1Office of the Law Revision Counsel. 26 USC 59A – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts
If you claim a net operating loss deduction, part of it also gets added back. The add-back equals the base erosion percentage of the NOL deduction, using the percentage from the year the loss arose. For losses generated before 2018, that percentage is zero, so pre-TCJA losses contribute nothing.8eCFR. 26 CFR 1.59A-4 – Modified Taxable Income First-time filers miss this one often.
Tentative BEAT
Multiply modified taxable income by 10.5%, or 11.5% for groups containing a bank or registered securities dealer.1Office of the Law Revision Counsel. 26 USC 59A – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts
Adjusted Regular Tax Liability
Regular tax liability begins as the tax computed at the standard 21% corporate rate.9Office of the Law Revision Counsel. 26 US Code 11 – Tax Imposed For the BEAT comparison, that amount is reduced by most tax credits you claim.
For tax years beginning in 2026, adjusted regular tax liability is reduced by all credits allowed under Chapter 1, including R&D credits and the energy-related credits that previously had special treatment.10Joint Committee on Taxation. Overview of the Base Erosion and Anti-Abuse Tax: Section 59A In earlier years, R&D credits and certain low-income housing, renewable energy, and energy investment credits weren’t part of that reduction, which kept the BEAT comparison baseline higher. Corporations relying heavily on R&D credits may see a larger BEAT liability under the 2026 rules than they did before.11Office of the Law Revision Counsel. 26 US Code 38 – General Business Credit
Final Liability
The BEAT is the tentative BEAT minus the adjusted regular tax liability, and not less than zero. If your adjusted regular tax already exceeds the tentative amount, you owe no additional BEAT. The tax only bites when foreign-related-party deductions have pushed your effective rate below the BEAT floor.
Waiving Deductions to Duck Under the Threshold
If your base erosion percentage sits just above 3%, you can voluntarily waive deductions that would otherwise be base erosion tax benefits, dropping the numerator of the percentage fraction below the threshold. The denominator stays where it is.
Make the election on Form 8991. You report a description of the waived deduction, the statutory provision it would normally be claimed under, the dollar amount waived, and where the deduction appears on the return.12eCFR. 26 CFR 1.59A-3 – Base Erosion Payments and Base Erosion Tax Benefits The waiver applies for all federal tax purposes. The deduction is genuinely gone.
Timing is flexible. You can elect on the original return, on an amended return within the limitations period, or during an IRS examination. You can increase the waived amount later. You cannot decrease it or revoke the election once made.12eCFR. 26 CFR 1.59A-3 – Base Erosion Payments and Base Erosion Tax Benefits Skipping the election in a future year needs no IRS consent. Run the numbers before waiving; a deduction given up is gone for good.
Completing and Submitting the Form
Form 8991 is titled “Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts.” Its parts track the statutory tests and calculation.
Structure
Part I covers the applicable taxpayer determination: aggregate group gross receipts and the base erosion percentage. If gross receipts don’t clear $500 million, you stop and don’t attach the form. If they clear it but the percentage is below threshold, Part I documents that result.
Part II and Schedule A handle the reporting of base erosion payments and tax benefits by category: interest, royalties, rents, service fees, and payments for depreciable or amortizable property. Schedule A is required whenever the gross receipts threshold is met. Part III brings modified taxable income, tentative BEAT, adjusted regular tax liability, and final BEAT liability together. Schedule C handles credit limitation calculations.
Filing Mechanics
Attach Form 8991 to your Form 1120. The due date is the 15th day of the fourth month after the end of the tax year, which is April 15 for calendar-year filers.13Internal Revenue Service. Publication 509 (2026), Tax Calendars A Form 1120 extension automatically extends Form 8991. The BEAT liability itself is reported on the appropriate line of Form 1120.
Do not write “See Attached” or “Available Upon Request” in an entry field. All required schedules and supporting statements must accompany the form and show the filer’s name and EIN.4Internal Revenue Service. Instructions for Form 8991
Records
Keep documentation identifying each foreign related party, the nature and amount of each payment, and its classification as a base erosion payment, an exclusion, or an exception. For the SCM exception, keep records showing the total service costs and the method used to allocate them. Transfer pricing documentation prepared for penalty protection under Section 6662 helps, but it won’t necessarily cover every BEAT-specific requirement.
Penalties
Underpayments traced to BEAT errors expose the corporation to the standard 20% accuracy-related penalty under Section 6662.14Office of the Law Revision Counsel. 26 US Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments With dozens of intercompany transactions to identify and categorize each year, the risk of understatement is real. Run the applicable taxpayer tests every year, even when you think you’re clearly below the thresholds, and keep contemporaneous documentation to back up the result.