Form 8993 – Section 250 FDII & GILTI Guide

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Plenty of preparers run the FDII and GILTI percentages first and check the cap last, which is backward. Form 8993 caps the combined FDII plus GILTI at taxable income on line 24, and if taxable income is zero or less you skip lines 25 through 27 and enter zero on lines 28 and 29. Test that limitation early and you avoid building out a full deduction that the form then forces back down to nothing.

Form 8993 is the Section 250 calculator for FDII and GILTI, filed only by domestic C corporations as an attachment to Form 1120. For tax years beginning before January 1, 2026, it allows a 37.5% deduction on FDII at line 28 and a 50% deduction on the GILTI inclusion plus its Section 78 gross-up at line 29. The GILTI inclusion on line 22 carries in from Form 8992, the December 2025 revision governs 2025 returns, and the calendar-year deadline is April 15, 2026, or October 15, 2026 with a Form 7004 extension.

Key Takeaways

• Form 8993 computes the Section 250 deduction for Foreign-Derived Intangible Income (FDII) and Global Intangible Low-Taxed Income (GILTI). The December 2025 revision governs 2025 returns.
• The deduction is available only to domestic C corporations. S corporations, RICs, and REITs cannot claim it; individuals generally need a Section 962 election to access comparable treatment.
• For tax years beginning before January 1, 2026, the FDII deduction is 37.5% of FDII (line 28) and the GILTI deduction is 50% of the GILTI inclusion plus the related Section 78 gross-up (line 29). Both flow to Form 1120, Schedule C.
• FDII (line 21) equals Deemed Intangible Income (DII, line 8) times the foreign-derived ratio (FDDEI / DEI, line 20). DII is DEI minus the 10% deemed tangible income return on QBAI.
• The combined FDII plus GILTI cannot exceed taxable income (line 24). If taxable income is zero or less, skip lines 25 through 27 and enter zero on lines 28 and 29.
• Form 8993 attaches to Form 1120 and inherits its deadline: April 15, 2026 for calendar-year filers, or October 15, 2026 with a Form 7004 extension. The GILTI inclusion on line 22 carries from Form 8992.

What Form 8993 is and who must file it

Form 8993 is the IRS calculator for the Section 250 deduction. It determines both the FDII deduction and the GILTI related Section 250 deduction, then applies the taxable income limitation so you do not over deduct. Attach it to the corporation’s return and file by the due date, including extensions.

You must file if you are a domestic C corporation claiming Section 250. Individuals who make a Section 962 election use the form to compute their Section 250 amounts tied to GILTI and FDII. REITs, RICs, and S corporations are generally out.

How the Section 250 deduction works

On Form 8993 you compute FDII by starting with Deduction Eligible Income, subtracting a deemed tangible return, and multiplying what remains by your foreign derived ratio. That yields FDII, which is eligible for a percentage deduction, subject to the taxable income cap. For the GILTI portion, you start with the inclusion from Form 8992, include the Section 78 gross up, then apply the GILTI percentage deduction, again limited by taxable income. The outputs flow to Form 1120.

Keep contemporaneous evidence for foreign use and customer location, such as contracts, shipping documents, billing and delivery addresses, and service agreements. These records are required under the FDII regulations.

A 2026 change you should plan for now

For tax years beginning after December 31, 2025, Congress modified Section 250. The law renames and revises elements of FDII and GILTI and adjusts the deduction percentages. The IRS will update forms and instructions, but your 2025 returns still follow the December 2025 instructions. Build your 2026 planning now to avoid surprises.

FDII basics and the definitions that drive Form 8993

FDII is a formula, not a guess. In simple terms, it is the foreign market portion of your Deemed Intangible Income, which itself is DEI minus a 10% return on QBAI, all computed in Parts I through III of Form 8993.

• Deduction Eligible Income, or DEI, equals gross income minus specified exclusions and properly allocable deductions.
• QBAI is the quarterly average adjusted basis of depreciable tangible property used to produce DEI.
• Deemed Tangible Income Return, or DTIR, equals 10% of QBAI. Deemed Intangible Income, or DII, is DEI minus DTIR.
• FDDEI is the slice of DEI connected to foreign persons and foreign use, broken out in Part II by three categories (sales of general property, sales of intangible property, and services) rather than tracked as a single bucket. Your foreign derived ratio is FDDEI divided by DEI, both net amounts after exclusions and allocable deductions, not gross income or gross DEI.

FDII equals DII multiplied by the foreign derived ratio. The documentation showing foreign use and foreign recipients is not optional, you need it to claim FDDEI.

GILTI basics and how Section 250 interacts

GILTI under Section 951A is a current inclusion based on CFC tested income, net of tested losses, over a deemed return on CFC QBAI. Corporations then apply the Section 250 GILTI deduction to the amount that includes the Section 78 gross up, before foreign tax credits. Individuals can elect Section 962 to use corporate computations, which can allow a Section 250 deduction and access to FTC mechanics; without a Section 962 election, an individual U.S. shareholder cannot claim the Section 250 deduction and is taxed on GILTI at ordinary individual rates. Coordinate Form 8992, Form 8993, and Form 1118 so the numbers tie.

Section 78 gross up in the workflow

If you claim deemed paid foreign taxes on GILTI, Section 78 requires a matching gross up to income. That gross up is included in the GILTI base on which the Section 250 deduction is computed, and the foreign taxes feed Form 1118 in the section 951A basket. This is easy to miss, and it will skew your taxable income limitation if you leave it out.

962 election impact

A Section 962 election lets an individual compute GILTI like a corporation, including the Section 250 deduction and Section 78 gross up, with potential access to foreign tax credits. If you go this route, confirm Form 1118 reporting and attach both Forms 8992 and 8993 to support the computation.

Calculating DEI the right way

Start in Part I of Form 8993. Compute gross income, strip out the statutory exclusions, then subtract properly allocable deductions. The exclusions include Subpart F, GILTI, specified dividends, and foreign branch income. Do the math on a consolidated basis where required, and document every exclusion and allocation method you use.

DEI inclusions and exclusions

Anchor to the lines. Lines 2a through 2h remove Subpart F and GILTI inclusions, certain dividends, specified oil and gas extraction income, financial services income, foreign branch income, and, on lines 2g and 2h, income and gain from the sale or other disposition of intangible property and certain other property. Only then do you subtract allocable deductions to arrive at DEI on line 6. Tie these steps back to your books and consolidations so the trail is obvious in review.

Allocation of deductions

After exclusions, the result depends on how you allocate and apportion deductions to DEI. Use methods that reflect where costs belong, and keep support for drivers like time records, usage, contracts, and geography. Small misallocations can move your FDDEI and your foreign derived ratio, which cascades into a different FDII.

• Identify exclusions precisely.
• Segregate foreign branch income early.
• Reconcile consolidation eliminations and intercompany items.
• Maintain workpapers that show your allocation logic.

Determining QBAI, DTIR, and DII

QBAI is the average quarterly adjusted basis (not year-end book value, fair market value, or original cost) of depreciable tangible property used to produce DEI. Use straight line depreciation for this purpose, exclude land and intangibles, and keep a quarterly audit trail. DTIR equals 10% of QBAI. DII equals DEI minus DTIR, floored at zero. In groups, aggregate these amounts and keep member level detail for review notes.

Computing the foreign derived ratio and FDII

In Part III you compute the foreign derived ratio, FDDEI divided by DEI, then apply that ratio to DII to get FDII. This sounds easy, but only the FDDEI items supported by foreign person and foreign use documentation qualify, and your ratio cannot exceed 1. Keep proof of recipient status and foreign use as the regulations prescribe.

Quick mapping

Input	What it feeds	Why it matters
DEI	Denominator of ratio	If you overstate DEI, you shrink FDII.
FDDEI	Numerator of ratio	Lapses in documentation reduce FDDEI.
DII	Multiplied by ratio	Errors here multiply downstream.
Docs	Evidence	Contracts, shipping, billing, and service logs prove foreign use.

Applying the taxable income limitation

Form 8993 Part III compares the sum of FDII and GILTI to taxable income computed without Section 250. If the sum exceeds taxable income, the form reduces FDII and GILTI proportionally, then only after that haircut do you apply the percentage deductions. If taxable income is zero or less, you skip the reduction lines entirely and enter zero for both the FDII and GILTI deductions even when FDII and GILTI are positive, and the unused amounts do not carry forward. Walk this test before close to avoid surprises on filing day.

The reduction worksheets show exactly how to allocate the limitation between FDII and GILTI when taxable income is the cap. Keep those in your workpapers.

Common errors and how to avoid them

• Leaving Subpart F, GILTI, or foreign branch income inside DEI, which inflates DEI and distorts the ratio.
• Missing the Section 78 gross up, which throws off both taxable income and the limitation.
• Misclassifying foreign derived sales or services without proof of foreign person or foreign use. The regulations are specific on substantiation.
• Using the wrong QBAI basis or depreciation method, which drives the 10% DTIR incorrectly.
• Applying the percentage deductions before running the limitation worksheet. The order matters.

Filing mechanics and deadlines

Attach Form 8993 to your timely filed Form 1120. Corporations generally file by the 15th day of the fourth month after year end, for example, a 2025 calendar year Form 1120 is due April 15, 2026. Use Form 7004 to extend if needed. Keep the return period consistent across Forms 1120, 8992, 1118, and 8993.

Amended returns and late filing options

If you need to correct Section 250, you can file Form 1120 X with a corrected Form 8993. Refund claims are subject to the statute of limitations, generally three years from the due date of the original return, including extensions, or two years from payment, whichever is later. Include full workpapers for DEI, DII, QBAI, FDDEI, and the taxable income limitation.

Penalties and relief

Missing Form 8993 does not create a separate penalty, but it can create underpayment interest and accuracy penalties if taxable income was wrong. Use reasonable cause and documentation to request relief where appropriate, and reconcile all cross form impacts when you amend.

Coordinating Forms 8992, 1118, and 1120 with Form 8993

• Pull the GILTI inclusion from Form 8992 Part II and include the Section 78 gross up in the base before applying the Section 250 GILTI deduction.
• Reconcile foreign taxes and gross ups on Form 1118 with the section 951A basket. Do not net Section 250 on the 1118, apply it in the deduction step on 8993.
• Ensure the final Section 250 deduction flows to the correct Form 1120 lines and that taxable income used in the limitation includes the required gross ups.

Software setup and data sources, a practical ONESOURCE map

If you use Thomson Reuters ONESOURCE, set Organizer flags for Section 250, confirm Transfer to Form 8993 is active during the US1118 Transfer, and run TAS Consolidate after upstream computes. Map data sources for DEI, DII, QBAI, and GILTI so Form 8993 lines populate. Items that do not auto populate, like partnership QBAI or manual overrides, must be entered in the FDII workpaper before transfer. Validate with FDII workpaper and TIBS reports. This prevents last minute zeroes and stale numbers.

Compute options checklist

• Validate GILTI via Transfer International before FDII.
• Batch import non populating items, for example, QBAI from fixed asset registers.
• Use overrides sparingly and document why.
• After member edits, re run TAS Consolidate with compute all underlying consolidations.
• Confirm results in Organizer and on Form 8993.

Recordkeeping and documentation that holds up

Store executed contracts, invoices, shipping records, customer addresses, and service logs that prove foreign derived sales and services. Keep reconciled schedules for DEI, DII, and QBAI, including quarterly averages under straight line rules. Maintain transfer pricing studies and intercompany agreements that support allocations. Retain Forms 1118 and 8992, Section 78 gross ups, and any Section 962 election materials through the statute period. The FDII regulations spell out the substantiation standards, follow them closely.

Build a single FDII binder, digital is fine, that ties every FDDEI claim to evidence. You will thank yourself during review or exam.

2026 planning alert, what changed in law and what it means for 8993

On July 4, 2025, Congress enacted a law that modifies Section 250 for tax years beginning after December 31, 2025. Among other changes, it adjusts the deduction percentages and revises elements of the FDII and GILTI frameworks, including the statutory terminology (FDDEI and Net CFC Tested Income) and the treatment of the 10% deemed tangible return. Confirm the enacted specifics, rates, terms, and effective dates against the final 2026 Form 8993 and instructions before relying on them. Expect the IRS to revise Form 8993 and instructions for 2026 filings. Plan ahead, because your modeling and documentation will shift.

Old rules for 2025 vs new rules for 2026 and later

Topic	2025 tax years	2026 and later
FDII terminology	FDII, FDDEI is the numerator concept	Regime redefined around FDDEI in statute
Deemed tangible return	DTIR equals 10% of QBAI	DTIR scheduled to be removed; confirm against the final 2026 Form 8993 instructions before filing
GILTI term	GILTI under section 951A	Reframed in statute (Net CFC Tested Income); confirm the term used on the final 2026 form before filing
Section 250 deduction rates	37.5% of FDII and 50% of GILTI	33.34% FDDEI deduction and 40% NCTI deduction (about 14% and 12.6% effective at the 21% corporate rate), per the Form 8993 instructions
Taxable income limitation	Applies, proportional reductions	Continues to apply with updated mechanics

These changes are effective for tax years beginning after December 31, 2025. Your 2025 returns still use the December 2025 IRS instructions for Form 8993. Build transitional workpapers that show both computations if you need provision to return reconciliations.

Practical examples and tips

• If you sell tangible goods to a foreign person and deliver outside the United States, retain carrier records and delivery addresses. If you sell rights to exploit intangibles worldwide, compute the foreign use share based on end user revenue outside the United States, and keep the worksheets. These are direct asks in the regulations.
• For GILTI, tie the 8992 inclusion to the 8993 deduction base and ensure the Section 78 gross up is in both the income and the Form 1118 baskets. Many missed limitations trace back to ignoring gross ups.
• In consolidated groups, centralize QBAI with quarterly snapshots and a depreciation crosswalk. Reviewers should not have to hunt for basis.

If delivery is your bottleneck

If your firm is drowning in production and review loops, the work does not get easier when Form 8993 enters the picture. This is where trained offshore staffing helps, placed inside your workflow with the structure that standardizes workpapers, protects review time, and keeps turnaround predictable. Accountably places U.S.-led offshore preparers into your firm, with multi-layer review that reduces revision cycles and protects quality. Use it only where it genuinely supports your delivery model and risk posture.

Professional help and next steps

If you are unsure about any of these calculations, engage a tax professional with international experience to validate DEI, QBAI, FDDEI, and the taxable income limitation. Provide contracts, shipping records, fixed asset schedules, foreign tax records, and transfer pricing support so they can model both 2025 and 2026 regimes and guard against exam risk. If your team is buried in production, consider structured offshore delivery only if it strengthens your controls, speeds reviews, and preserves confidentiality.

Step by step checklist you can use on every engagement

Set up and scope

• Confirm filer eligibility and whether a Section 962 election applies.
• Identify entities and consolidations that feed DEI, FDDEI, and QBAI.

Compute inputs

• Build DEI, excluding Subpart F, GILTI, foreign branch income, and certain dividends. Document allocations.
• Calculate QBAI with quarterly averages and straight line depreciation, then compute DTIR and DII.
• Compile FDDEI with substantiation of foreign person and foreign use.

Run Form 8992 and Form 1118

• Compute the GILTI inclusion on Form 8992 and capture the Section 78 gross up.
• Map foreign taxes and categories on Form 1118, do not net Section 250 here.

Complete Form 8993

• Part I, compute DEI and DII.
• Part II, compute FDDEI.
• Part III, compute the foreign derived ratio and FDII, and pull GILTI from Form 8992.
• Part III, apply the taxable income limitation, then the deduction percentages.

Review and file

• Cross check the deduction’s flow to Form 1120.
• Attach Form 8993 to a timely filed return, extend with Form 7004 if needed.

Final word

You have a workable path for Form 8993, from inputs to limitation. Focus on clean DEI builds, disciplined QBAI, and provable FDDEI. Tie GILTI and Section 78 gross ups across Forms 8992 and 1118, run the taxable income test before close, and keep evidence that answers reviewer questions in minutes, not hours. For 2026 and beyond, model the law change early so your provision matches the return and there are no surprises when the IRS updates the form and instructions.

Common Mistakes We See Every Season

The same handful of errors surface on Form 8993 every filing season, and most trace back to skipping the limitation math or treating foreign sales as automatic FDII. Here are the ones my team flags most often.

Reusable Checklists

These checklists are copy-paste ready for your Form 8993 SOP. Drop them into your workpaper template so every preparer follows the same path from inputs to the limitation.

Keep 8993 Season From Stalling

Form 8993 does not arrive on its own. It lands at corporate return time, riding on Form 1120 and pulling numbers from Form 8992 and Form 1118, and the December 2025 revision still runs 29 numbered lines across three parts (per Form 8993, Rev. December 2025). When the GILTI inclusion, the Section 78 gross-up, and the FDDEI documentation all have to tie out in the same week the provision closes, the international package becomes the bottleneck for the whole return.

The fix is not more late nights. It is a documented workflow that front-loads the evidence and the cross-form tie-outs so the limitation math is the last step, not the scramble. The 37.5% FDII and 50% GILTI deductions move the effective federal rate on that income to 13.125% and 10.5% under IRC §250, so the dollars at stake justify a real SOP rather than a once-a-year reinvention.

• Lock the DEI build first: gross income on line 1, the eight exclusions on lines 2a through 2h, allocable deductions on line 5, then DEI on line 6.
• Stand up the FDDEI evidence file by category (Part II, columns A through C) before populating gross receipts, not after a notice.
• Tie line 22 to Form 8992 and confirm the Section 78 gross-up flows to Form 1118 in the section 951A basket.
• Run the line 23 versus line 24 limitation test before close so lines 25 through 29 are mechanical.
• Keep partnership amounts on their own sub-lines (7b, 9b, 10b, 13, 17) so the totals never double count.

That is the kind of structured, review-ready execution our team builds into every engagement. If the Section 250 package is what stalls your corporate returns, see how our tax delivery service handles the preparation, cross-form tie-outs, and workpapers so reviewers spend minutes confirming, not hours rebuilding.

FAQs

Who is required to file Form 8993?

Domestic C corporations that claim a Section 250 deduction must attach Form 8993 to the return. Individuals who make a Section 962 election use Form 8993 to compute Section 250 amounts tied to GILTI and FDII. REITs, RICs, and S corporations are generally not eligible filers.

How do I document foreign derived income for FDDEI purposes?

Use the FDII regulations’ substantiation rules. Keep recipient foreign person evidence, shipping or delivery records showing foreign delivery or foreign use, and service or licensing agreements that tie revenue to customers outside the United States.

Does the taxable income limitation apply before or after the percentage deductions?

Before. Form 8993 reduces FDII and GILTI proportionally if their sum exceeds taxable income without Section 250, then applies the deduction percentages to the reduced amounts.

How does the Section 78 gross up affect Form 8993?

The Section 78 gross up increases income for the GILTI base on which the Section 250 deduction is computed, and it increases foreign taxes available for credit on Form 1118 in the section 951A basket. Leaving it out misstates both the limitation and the credit.

What changed for tax years beginning after December 31, 2025?

New law modifies Section 250. It eliminates the 10% deemed tangible return, adjusts the deduction percentages, and reframes FDII and GILTI in statute. Expect updated Form 8993 instructions for 2026 filings, and model both regimes during transition.

What are the filing deadlines, and can I extend?

A corporation generally files Form 1120, with Form 8993 attached, by the 15th day of the fourth month after year end. For a 2025 calendar year, that is April 15, 2026. You can request an extension with Form 7004 by the original due date.

I missed Form 8993 in a prior year, can I amend?

Yes, if the statute is open. File Form 1120 X with a corrected Form 8993 and full workpapers. Refund claims generally follow the three year from due date or two year from payment rule, whichever is later.

I keep hearing about Forms 982, 8833, and 8233. Are these related?

They are different tools. Form 982 deals with canceled debt and attribute reductions. Form 8833 discloses treaty based positions. Form 8233 supports treaty withholding relief for nonresident individuals performing services. They are not part of the Section 250 package with Forms 8992, 8993, 1118, and 1120. Check each form’s instructions if any applies to your facts.