Form 8991: BEAT Tax Thresholds, Calculation, and Penalties

Form 8991 is the IRS form a corporation uses to figure out whether it owes the Base Erosion and Anti-Abuse Tax, known as the BEAT. The form is attached to Form 1120 and is required when your corporation’s aggregate group averages at least $500 million in annual gross receipts over the three tax years ending with the prior year. The BEAT itself, enacted under IRC Section 59A, works as a minimum tax: your corporation recalculates its tax after adding back deductible payments to foreign related parties, and if that recalculated amount exceeds your regular tax, you pay the difference. The standard rate is 10.5% of modified taxable income, with 11.5% for groups that include a bank or registered securities dealer.

Who Has to File Form 8991

Only an “applicable taxpayer” actually owes the BEAT, and that status depends on two tests. Your corporation must clear both to pay the tax, but you may need to file the form after clearing only one.

The Gross Receipts Test

Your corporation meets this test if its average annual gross receipts over the three tax years ending with the prior year reach at least $500 million.¹ 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 of the property sold.

The threshold applies to the entire aggregate group, not a single entity. Aggregation rules under IRC Section 52 treat all members of a controlled group as a single employer, so their gross receipts are combined.² 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

The second test measures how much of your deduction pool goes to foreign related parties. You divide total base erosion tax benefits by the 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).¹ Cost of goods sold is not in the denominator either, because it reduces gross income rather than being a deduction.

The percentage must reach 3% or higher. A lower 2% threshold applies if your aggregate group includes a bank or registered securities dealer.³ Clear both tests and your corporation is an applicable taxpayer that must complete the full calculation.

Who Is Excluded and Who Still Files

Regulated investment companies, real estate investment trusts, and S corporations are carved out of the applicable taxpayer definition entirely, even when they belong to a group above the $500 million threshold.¹ They do not file Form 8991.

If your corporation passes the Gross Receipts Test but falls below the base erosion percentage threshold, you still file Form 8991 and complete Part I to document non-applicability.⁴ If your aggregate group doesn’t reach $500 million in average gross receipts, no filing is required.

What Counts as a Base Erosion Payment

A base erosion payment is an amount your corporation pays or accrues to a foreign related party that generates a deduction. The common examples: interest to a foreign parent, royalties for intellectual property licensed from a foreign affiliate, rent on equipment owned by an overseas subsidiary, and fees for management or technical services from a foreign related entity.

Payments for depreciable or amortizable property acquired from a foreign related party also count, with different mechanics. The base erosion payment equals the full purchase price, but the base erosion tax benefit shows up as the annual depreciation or amortization deduction. The add-back to modified taxable income spreads over the asset’s useful life rather than hitting all at once.

Payments That Are Excluded

Payments already subject to U.S. withholding tax under Sections 871 or 881, generally the 30% rate on U.S.-source income paid to foreign persons, are excluded.⁵ If the payment is already taxed here, the base-erosion concern disappears. Amounts properly included in cost of goods sold are also excluded.

The Services Cost Method Exception

Payments for certain low-margin services can escape base erosion treatment under the Services Cost Method exception. If a service qualifies for the SCM under the Section 482 transfer pricing rules, the cost component is excluded from base erosion payments, even if you actually price the transaction using a different transfer pricing method.⁶ The service must be eligible for the SCM without relying on the business judgment rule.

Only the cost portion is carved out. Any markup above total services cost remains a base erosion payment, so you need documentation that cleanly separates cost from profit.⁷ This is one of the more labor-intensive parts of BEAT compliance.

Partnership Payments

Partnerships are treated on an aggregate basis for BEAT purposes. If your corporation is a partner in a partnership that makes deductible payments to a foreign related party, your share of those payments can be treated as base erosion payments on your Form 8991.³ Anti-abuse rules let the IRS disregard allocations that have a principal purpose of avoiding base erosion treatment without changing the real economic arrangement.

Calculating the BEAT Liability

The calculation, done in Part III of Form 8991, compares a tentative BEAT amount against your adjusted regular tax liability. You owe additional tax only if the tentative amount is higher.

Step 1: Compute Modified Taxable Income

Start with regular taxable income under Section 63 and add back all base erosion tax benefits. These include deductions for interest, royalties, service fees, and other base erosion payments, plus depreciation or amortization on property acquired from foreign related parties in current or prior years.¹

A portion of any net operating loss deduction also gets added back. The add-back equals the base erosion percentage of the NOL deduction, using the base erosion percentage from the year the loss arose. For losses generated before 2018, that percentage is zero, so pre-TCJA losses carry no add-back.⁸ This NOL step is easy to miss on a first filing.

Step 2: Apply the BEAT Rate

Multiply modified taxable income by the applicable rate to get the tentative BEAT. The standard rate is 10.5%; it rises to 11.5% if your affiliated group includes a bank or registered securities dealer.¹

Step 3: Determine Adjusted Regular Tax Liability

Your regular tax liability starts as the tax computed at the standard 21% corporate rate.⁹ For BEAT comparison purposes, this figure is reduced by most tax credits your corporation claims. The adjusted number represents what you’d actually pay after credits.

For tax years beginning in 2026, the 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.¹⁰ In earlier years, R&D credits and certain low-income housing, renewable energy, and energy investment credits were excluded from the reduction, meaning they didn’t lower the baseline for the BEAT comparison. From 2026 onward those carve-outs are gone, and corporations that rely heavily on R&D credits may see a larger BEAT liability than they would have under the earlier rules.

Step 4: Compare and Compute

Your BEAT liability equals the tentative BEAT minus the adjusted regular tax liability, but never less than zero. If adjusted regular tax already exceeds the tentative BEAT, you owe nothing extra. The tax kicks in only when foreign-related-party deductions have pulled your effective rate below the BEAT floor.

Electing to Waive Deductions

If your corporation lands just above the 3% base erosion percentage threshold, you can voluntarily waive deductions that qualify as base erosion tax benefits, pulling the percentage below 3% and avoiding the BEAT. The waiver shrinks the numerator of the fraction while leaving the denominator unchanged.

The election is made on Form 8991 and can cover all or part of a deduction. You must report a description of the waived deduction, the statutory provision under which it would normally be claimed, the dollar amount waived, and where the deduction appears on the return.¹¹ The waiver applies for all federal tax purposes, so the deduction is genuinely lost for the year.

Timing is flexible. You can make the election on the original return, on an amended return filed within the limitations period, or during an IRS examination. You can increase the waived amount on an amended return or during an exam, but you cannot decrease it or revoke the election once made.¹¹ Run the numbers carefully before waiving. A deduction given up is gone for good.

Completing and Submitting Form 8991

Form 8991 is titled “Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts” and is organized into parts that follow the statutory tests and the calculation.

Form Structure

Part I covers the applicable taxpayer determination. You report aggregate group gross receipts and compute the base erosion percentage. If the Gross Receipts Test isn’t met, you stop here, attach the partially completed form, and move on. If receipts exceed $500 million but the base erosion percentage falls below the threshold, you still finish Part I to document the result.

Part II and Schedule A handle detailed reporting of base erosion payments and base erosion tax benefits. Schedule A is required whenever the gross receipts threshold is met, and it breaks payments into categories: interest, royalties, rents, service fees, and payments for depreciable or amortizable property. Part III brings modified taxable income, the tentative BEAT, adjusted regular tax liability, and the final BEAT amount together. Schedule C handles the credit limitation calculations.

Filing Mechanics

Attach Form 8991 to your corporation’s 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 corporations.¹² An extension on Form 1120 automatically extends Form 8991. The BEAT liability is reported on the appropriate line of Form 1120.

IRS instructions prohibit entering “See Attached” or “Available Upon Request” in any field. All required schedules and supporting statements must accompany the form and clearly show the filer’s name and EIN.⁴

Record-Keeping

Keep documentation substantiating the identification of foreign related parties, the nature and amount of each payment, and its classification as a base erosion payment, an excluded item, or an exception. For the Services Cost Method exception, records must show the total costs attributable to the services and the method used to allocate them. Transfer pricing documentation prepared for penalty protection under Section 6662 may help but won’t necessarily cover every BEAT-specific requirement.

Penalties for Getting It Wrong

Errors in the BEAT calculation that produce an underpayment expose your corporation to the standard 20% accuracy-related penalty under Section 6662.¹³ Identifying and categorizing base erosion payments across dozens of intercompany transactions is complex, and understatement risk is real. Running the applicable taxpayer tests every year, even in years you expect to fall below the thresholds, and keeping contemporaneous documentation gives you the best defense if the IRS questions the return.

1
Office of the Law Revision Counsel. 26 USC 59A – Tax on Base Erosion Payments of Taxpayers With Substantial Gross Receipts
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Office of the Law Revision Counsel. 26 US Code 52 – Special Rules
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Internal Revenue Service. IRC 59A Base Erosion Anti-Abuse Tax Overview
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Internal Revenue Service. Instructions for Form 8991
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Office of the Law Revision Counsel. 26 US Code 881 – Tax on Income of Foreign Corporations Not Connected With United States Business
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Internal Revenue Service. IRS Chief Counsel Advice 202529008 – Services Cost Method Exception for Purposes of Section 59A(d)(5)
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eCFR. 26 CFR 1.482-9 – Methods to Determine Taxable Income in Connection With a Controlled Services Transaction
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eCFR. 26 CFR 1.59A-4 – Modified Taxable Income
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Office of the Law Revision Counsel. 26 US Code 11 – Tax Imposed
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Joint Committee on Taxation. Overview of the Base Erosion and Anti-Abuse Tax: Section 59A
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eCFR. 26 CFR 1.59A-3 – Base Erosion Payments and Base Erosion Tax Benefits
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Internal Revenue Service. Publication 509 (2026), Tax Calendars
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Office of the Law Revision Counsel. 26 US Code 6662 – Imposition of Accuracy-Related Penalty on Underpayments