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FDII is now FDDEI: what the OBBBA rename actually changed

OBBBA renamed FDII to FDDEI effective TY2026. The deduction percentage moved too. Here's the substantive-vs-cosmetic boundary, with vendor-AI accuracy notes.

AI Tax Practitioner Editorial

Published ·18 min read ·Last reviewed

The lede in one paragraph: OBBBA renamed FDII to FDDEI and renamed GILTI to NCTI in §951A. The audience reflex is to assume cosmetic relabel; that read is wrong. The rename is statutory and real, the substance changed materially, and the change hits in two waves — a mid-2025 transactions cutover and a full TY2026 regime change. Most online content still says “FDII” because the Treasury Regulations at Treas. Reg. §1.250(b)-1 have not been re-issued, and most AI tax-research tools currently return mixed terminology for the same structural reason. This is the working-practitioner read of what changed, what didn’t, what the transition workflow looks like, and what the AI tools are getting wrong.

The 30-second answer

Eight facts a practitioner with one or two C-corp clients carrying foreign-derived income needs in order to brief the client and run the math:

  • The rename is statutory, not regulatory. OBBBA amended IRC §250 so that the section title now reads “Foreign-derived deduction eligible income and net CFC tested income.” The 2020-vintage Treas. Reg. §1.250(b)-1 heading still says “Computation of foreign-derived intangible income (FDII).” Treasury has not yet re-issued the regs.
  • The §250(a)(1)(A) deduction is now 33.34%. Down from 37.5% pre-OBBBA. Up from the 21.875% that was scheduled to take effect TY2026 absent OBBBA. Paired with the 21% §11(b) corporate rate, the effective rate on FDDEI is now roughly 14% (vs 13.125% pre-OBBBA, vs the 16.4% scheduled step-down). (WilmerHale; Holland & Hart; Cornell LII §250.)
  • QBAI is gone. The 10%-of-Qualified-Business-Asset-Investment carve-out that defined “deemed intangible” income was struck. FDDEI applies to the full pool of foreign-derived deduction-eligible income, not just the deemed-intangible slice. (BDO; RKL LLP.)
  • Two new DEI exclusions live at §250(b)(3)(A)(i)(VII). Sales or dispositions of (a) intangible property and (b) depreciable, amortizable, or depletable property no longer qualify for the deduction. Effective for transactions occurring after June 16, 2025 — the one mid-year cutover practitioners have to watch. (IRS Form 8993 instructions, Dec 2025 revision; Forvis Mazars on Notice 2025-78.)
  • Interest and R&E no longer allocate against DEI. Effective TY2026. The denominator effect widens the FDDEI base and partially offsets the lower deduction percentage. (Mayer Brown.)
  • The §250 deduction is C-corp-only. Plus the §962-electing individual US shareholder of a CFC. S-corps, partnerships, LLCs taxed as partnerships, sole props, REITs, and RICs get nothing. Per the IRS Form 8993 instructions verbatim.
  • The 2025 (filed-in-2026) Form 8993 still says FDII. The TY2026 return — filed in 2027 — is the first one that will carry the FDDEI label and the 33.34% rate.
  • The AI tools are unreliable on this for now. CoCounsel, TaxGPT, Blue J, ChatGPT, Claude, Perplexity, Gemini, Copilot — every one of them is structurally exposed to the regulation-vs-statute asymmetry. The detail is in the AI tools section below.

What §250 did before OBBBA — the FDII regime being replaced

TCJA introduced §250 in 2017 as a paired-deduction architecture: domestic C-corporations got a deduction against FDII (the foreign-derived earnings on US-held activity) and a separate §250(a)(1)(B) deduction against GILTI inclusions on CFC tested income. The pre-OBBBA mechanics produced a 37.5% deduction on FDII and a 50% deduction on GILTI. At the 21% corporate rate that meant effective US rates of 13.125% on FDII and 10.5% on GILTI. TCJA scheduled both deductions to step down for tax years beginning after December 31, 2025 — to 21.875% on FDII (16.4% effective) and 37.5% on GILTI (13.125% effective). The scheduled step-down kept FDII in the practitioner-anxiety lane through the first half of 2025. (Cooley LLP.)

The “intangible” name came from how FDII was computed. The statute did not measure intangible income directly. It computed Deduction Eligible Income (DEI) — gross income net of certain exclusions and properly allocable expenses — then carved out the foreign-customer slice of DEI, then subtracted a 10%-of-QBAI floor to get “deemed intangible income.” FDII was the foreign-derived ratio applied to that deemed-intangible figure. The 10%-of-QBAI offset notionally stripped out the return on tangible assets, on the theory that only the intangible portion of foreign-derived income deserved the preferential rate. Asset-heavy exporters got penalized; pure-IP exporters got the full benefit. That conceptual hook — the “intangible” framing — is what OBBBA removed. The Tax Foundation states the new shape directly: “these nomenclature changes also signify changes in function.” (Tax Foundation.)

What OBBBA did — the rename plus the substantive recalibration

The §250 changes sit in OBBBA §70321 through §70323. The headline numbers, the QBAI elimination, and the two new DEI exclusions are summarized in the table below. Cornell LII’s current statutory text confirms the percentages and the section-title rename; the table merges the practitioner-firm syntheses (WilmerHale, BDO, Mayer Brown, Holland & Hart, RKL LLP, RSM) that all converge on the same numbers.

The §250 deduction structure before, during the scheduled step-down, and after OBBBA
Pre-OBBBA (TY < 1/1/2026)Scheduled (TY ≥ 1/1/2026, absent OBBBA)Post-OBBBA (TY ≥ 1/1/2026)
§250(a)(1)(A) deduction37.5% (FDII)21.875%33.34% (FDDEI)
FDDEI effective rate at 21%13.125%16.4%~14.0%
§250(a)(1)(B) deduction50% (GILTI)37.5%40% (NCTI)
NCTI effective rate at 21%10.5%13.125%~12.6%
QBAI / DTIR offset10% of QBAI(same)eliminated
§250(b)(3) IP / depreciable-property exclusion——new clause (VII)
Interest + R&E allocation against DEIappliedappliedno longer allocated
§960(d) NCTI deemed-paid FTC haircut20%20%10%
§59A BEAT rate10%12.5% scheduled10.5% permanent

Three observations worth holding before drafting any client memo on this.

First, the framing depends on the baseline. A client looking only at the headline (“rate went up from 13.125% to 14%”) will read this as a small tax increase. A client comparing to the scheduled step-down (“16.4% became 14%”) will read it as a tax cut. Both are technically true. Holland & Hart frames it as “Congress changes the FDII deduction” and emphasizes the prevented step-down. The client will hear whichever framing they hear first; document both.

Second, the deduction-rate reduction is partially clawed back by the base-widening provisions. QBAI elimination broadens the FDDEI pool for asset-heavy exporters. Removing interest and R&E from the allocation rule widens it again. KPMG’s January 2026 transfer-pricing note: “Many MNEs will be able to claim larger FDDEI deductions starting in 2026 than they could under current law.” The net effect for asset-heavy or R&E-heavy US exporters is, in many fact patterns, more deduction in 2026 than they got under FDII — at a lower rate. Asset-light pure-IP exporters who maximized the prior DTIR-friendly math are the ones whose absolute benefit shrinks.

Third, the two new exclusions at §250(b)(3)(A)(i)(VII) are narrowly targeted but consequential. Outbound IP sales — the historical pattern where a US C-corp transferred IP to a foreign subsidiary at low gain and recharacterized the resulting royalty stream as FDII-eligible — are no longer FDDEI-eligible on the gain side. The ongoing royalty stream from licensing IP for foreign use remains FDDEI-eligible. The boundary between “license” (in) and “sale or disposition of intangible property” (out) is the litigation/audit frontier; Notice 2025-78 (Dec 4, 2025) announces forthcoming proposed regs on this specific carve-out and lets taxpayers rely on the notice in the interim. Conservative practitioner stance: document the licensing nature of any IP-related foreign revenue carefully, and treat the §367(d)(4) cross-reference as the operative definition of “intangible property.”

The two-stage transition: TY2025 vs TY2026

The transition is not a single cutover. The rate change, the QBAI elimination, and the allocation rule all hit for tax years beginning after December 31, 2025. The new IP / depreciable-property exclusion hits for transactions occurring after June 16, 2025 — six and a half months earlier. The mismatch creates a fiscal-year filer trap that practitioners need to flag now.

For calendar-year C-corps the practical workflow is:

TY2024 returns being filed (extended) October 2025 through March 2026. Use FDII. Use the December 2025 revision of Form 8993, which still uses the FDII label, the 37.5% deduction, and the 50% GILTI deduction. The June 16, 2025 carve-out is generally not in scope for TY2024 because the relevant sales occurred before that date — confirm against the client’s transaction calendar before relying on this.

TY2025 returns being filed in 2026. Still FDII. Still Form 8993 December 2025 revision. Still 37.5% / 50% rates. The June 16, 2025 carve-out is now fully in scope. Per the IRS Form 8993 instructions: “Public Law 119-21, commonly known as the One Big Beautiful Bill Act, amended section 250 in part by adding to the list of gross income items that are excluded in determining Deduction Eligible Income (DEI)… These amendments apply to sales or other dispositions occurring after June 16, 2025.” Any 2025 outbound sale of IP or of depreciable, amortizable, or depletable property has to be carved out of DEI for the post-June 16 portion of the year. The pre-June 16 portion of the year is computed under the legacy rules.

TY2026 returns being filed in 2027. First filings using FDDEI as named. New 33.34% / 40% rates. No QBAI offset. No interest or R&E allocation against DEI. Form 8993 is expected to be revised; as of May 2026 no draft TY2026 form has been released. The §1.250 regs are expected to be re-issued in proposed form during 2026; until then practitioners read the existing regs by substituting the new terminology where the statutory rename has occurred.

Fiscal-year C-corps with non-calendar tax years are the trickiest case. A fiscal-year filer whose TY2025 runs July 1, 2025 - June 30, 2026 still gets the legacy 37.5% rate for the whole fiscal year — the §250 percentage change applies to “tax years beginning after December 31, 2025” and the FY beginning July 1, 2025 begins before the cutoff. But the June 16, 2025 IP carve-out applies on a transaction-date basis inside that fiscal year. So the practitioner has to split the year’s transactions at the June 16 line, exclude post-June-16 IP and depreciable-property sales from DEI, and compute FDII (still using the legacy formula) on what remains.

The two-stage timing produces a practical artifact: TY2025 returns being filed in 2026 carry the FDII label, but the underlying calculation now reflects a partial OBBBA recalibration via the June 16 exclusion. The TY2026 return is when the new name and new rates land together. Most online content blurs this — including some of the AI tools.

Who actually qualifies — the C-corp-only reality

For solo CPA and small-firm-partner audiences this is the section that determines whether FDDEI is on this season’s checklist or a once-a-year client conversation. The §250 deduction is statutorily limited to domestic C-corporations. The IRS Form 8993 instructions are explicit: the deduction excludes “real estate investment trusts (REITs), regulated investment companies (RICs), and S corporations.” Partnerships and LLCs taxed as partnerships do not compute a §250 deduction at the entity level; only C-corp partners get §250 on their distributive share of FDDEI. Sole proprietors and individuals get nothing — with one exception.

The exception is the §962 election. An individual US shareholder of a CFC who elects under §962 is treated as if they were a domestic C-corporation for purposes of §951 and §951A inclusions, which makes the §250 deduction available against the resulting NCTI inclusion. Per the Form 8993 instructions: “All domestic corporations (and U.S. individual shareholders of controlled foreign corporations (CFCs) making a section 962 election…) must use Form 8993.”

Whether the §962 election extends to FDDEI treatment in addition to NCTI treatment is the practitioner-trap area. The §962 fiction technically extends to §951 inclusions; the §250(a) operative text refers to “domestic corporations.” The instructions’ parenthetical implies both sides of the §250 deduction flow through, and the Withum analysis at post-OBBBA §962 considerations reads it the same way. Until proposed regs clarify, this is the kind of question that should run through a specialist or a primary-source-grounded tool before being committed to a return.

In practice, the FDDEI conversation in solo and small-firm practice tends to be one of:

  • A US-based SaaS C-corp client with foreign subscription revenue.
  • A US-based manufacturer or distributor with export goods revenue.
  • A US-based engineering, consulting, design, or professional-services firm with non-US clients.
  • A US-based licensor of IP for foreign use (the licensing side, not the sale side).
  • An individual US shareholder of a CFC, considering or already running a §962 election.

For pass-through clients — S-corps, partnerships, sole props — with material foreign-derived income, the FDDEI conversation is a structural one. The math at the C-corp level can be favorable (~14% on FDDEI, ~12.6% on NCTI plus FTC offset), but converting from pass-through to C-corp trades pass-through treatment for double-taxation on distributions. The right answer is fact-and-circumstances and far outside this article’s scope, but the question is going to come up more often after TY2026 once clients hear about the new rate from a peer or a Twitter feed.

NCTI coordination — the paired deduction

FDDEI is half of a paired §250 deduction. The other half is the §250(a)(1)(B) deduction against §951A Net CFC Tested Income — formerly GILTI, renamed NCTI by OBBBA §70321. The NCTI side moved together with the FDDEI side, and any FDDEI client conversation that involves a CFC structure has to address both. The detail belongs in the companion GILTI → NCTI article; the operative changes are:

  • §250(a)(1)(B) deduction dropped from 50% to 40%. Effective NCTI rate moved from 10.5% to roughly 12.6% at the 21% corporate rate.
  • §951A QBAI / Deemed Tangible Income Return offset struck. NCTI now equals the gross tested-income inclusion without any return-on-tangibles deduction, which widens the inclusion base.
  • §960(d)(1) deemed-paid FTC haircut on §951A inclusions reduced from 20% to 10%, so creditable foreign taxes flow through at 90% (up from 80%).
  • New §904(b)(5) mirrors the FDDEI-side allocation change: interest and R&E expenses are no longer allocated against the NCTI FTC basket.
  • New §960(d)(4) disallows 10% of foreign taxes attributable to §951A PTEP distributions for distributions occurring after June 28, 2025 — another mid-2025 transition date worth flagging on the workpapers.

The net read for the C-corp client with both FDDEI on outbound sales and NCTI on a CFC subsidiary: wider base, smaller deduction percentage, friendlier FTC. For high-tax-jurisdiction CFCs the FTC improvement materially offsets the deduction reduction. For low-tax or zero-tax-jurisdiction CFCs the effective US rate is closer to 12.6% with less FTC offset. The “should we still be a C-corp” question gets a different answer in 2026 than it did in 2024.

The §250(a)(2) taxable-income limitation — which scales back the §250 deduction if FDDEI + NCTI exceeds taxable income computed without §250 — survives OBBBA substantively unchanged. The pro-rata reduction mechanic remains. Practitioners with C-corp clients running at low taxable income relative to FDDEI + NCTI should still watch the limitation.

Where the AI tools currently get this wrong

This is the section that practitioner readers landed on this article to find. The honest answer is that every retrieval-augmented and non-retrieval AI tax-research tool a US practitioner realistically uses is, as of May 2026, exposed to the same structural problem on FDDEI — and the failure mode is broadly the same across vendors.

The structural problem. Cornell LII’s text of 26 USC §250 now reads “Foreign-derived deduction eligible income and net CFC tested income,” with the OBBBA-amended body text reflecting the 33.34% / 40% percentages and the new (VII) exclusion. But the underlying Treas. Reg. §1.250(b)-1 — the operational machinery for the computation — still carries the heading “Computation of foreign-derived intangible income (FDII)” and still uses FDII throughout. Treasury announced in Notice 2025-78 that proposed regulations on the new (VII) exclusion are forthcoming. Comments on the notice closed February 2, 2026; no proposed regs have been published as of May 2026. The IRS Form 8993 (December 2025 revision) and its instructions still bear the FDII label. The result is that statute, regulations, and the controlling IRS form are temporarily out of sync, and any tool that retrieves across all three returns mixed terminology by design.

The knowledge-cutoff overlay. Frontier general models in active practitioner use have training cutoffs that span the OBBBA enactment date. GPT-5 base has a September 30, 2024 cutoff. Claude Sonnet 4.5 is reliable through January 2025 (trained through July 2025). Claude Opus 4.5 is reliable through August 2025. With web search disabled, a model trained before July 4, 2025 has zero pre-training awareness of OBBBA. A model trained through mid- or late 2025 has some awareness but its corpus is dominated by pre-rename content. (Anthropic Claude support article on training data currency.)

The retrieval-corpus overlay. Even with web search enabled, the indexed open web in May 2026 is dominated by pre-rename or mixed-terminology sources. BDO’s flagship post is titled “FDII Transformed: How the OBBBA Reshapes the Deduction for Foreign-Derived Income” — FDII in the headline, FDDEI introduced in body. Bloomberg Tax’s reference page is titled “Comparing FDII (Now FDDEI) and GILTI (Now NCTI)” — parenthetical rename. Tax Foundation’s TaxEDU glossary entry is still “Foreign-Derived Intangible Income (FDII).” The IRS’s own §250 practice unit PDF is pre-OBBBA. A retrieval layer that does its job well will surface all of these — and the generation layer will then have to choose between competing terminologies.

Where the named tax-AI tools sit in May 2026.

CoCounsel (Thomson Reuters) runs over the Checkpoint corpus. Checkpoint’s editorial layer is updated proactively, so post-OBBBA international-tax coverage is current at editorial level. The structural risk is mixed-corpus blending — Checkpoint contains both pre-OBBBA and post-OBBBA editorial content, and the generation layer may surface or blend the older content unless the prompt specifies the controlling tax year. No public verbatim screenshot of CoCounsel returning an FDII-era answer on an FDDEI prompt is indexed as of this writing.

Blue J is statute-anchored, which is the relevant architectural detail. The statutory text at §250 is updated. Practitioner sentiment on TaxProExchange reports trust in Blue J specifically “because it cites statutes.” Of the named tax-research tools, Blue J is structurally the most likely to return correctly-rebranded FDDEI terminology — but any answer pulling regulatory-level detail will surface FDII language because the regs themselves still say so. TaxGPT, per the same TaxProExchange thread, is reported by practitioners to be “wrong more often than Blue J” and to “rely on IRS publications instead of primary authority” — and IRS publications and Form 8993 lag the statutory rename. If TaxGPT preferentially surfaces publication-level language over statute, it is structurally more exposed to returning pre-rename FDII content on a §250 query.

Bloomberg Tax Answers and CCH AnswerConnect are the cleanest editorial cases. Bloomberg’s flagship FDDEI comparison page is titled correctly with the rename acknowledged in the title. CCH AnswerConnect has retitled its content explicitly: “FDDEI and NCTI (Formerly FDII and GILTI) Deduction.” Wolters Kluwer’s editorial layer is doing real work here. CCH Axcess iQ markets explicit OBBBA legislative-impact mapping — identifying which clients are affected by which OBBBA provisions. For practitioners with firm-paid access, these are currently the most reliable starting points.

Consumer general-purpose LLMs — ChatGPT, Claude, Perplexity, Gemini, Copilot — have a documented record of returning stale post-OBBBA answers. The Wealth AI Audit (5W / Haute Wealth, May 6, 2026) tested all five engines on OBBBA-era estate-planning questions and documented that every engine continued to surface pre-OBBBA TCJA “sunset” guidance as if it were live advice. The CBS News piece on AI for tax-prep quotes American University’s Caroline Bruckner: “recent tax changes under the Republicans’ ‘one big beautiful bill act,’ or OBBBA, may not be reflected in AI-generated responses.” (CBS News, March 27, 2026.) Ed Zollars CPA documented in August 2025 a separate failure mode where ChatGPT, Gemini, and Blue J all converged on the same wrong answer on a §62 / §63 deductions question — illustrating that even when retrieval is working, training-corpus bias can produce coherent wrong answers across vendors. (Ed Zollars CPA blog.)

The practitioner workflow implication. For now, the AI-tool output on FDDEI should be treated as a first-draft pointer, not a citable answer. The verification step against the current Cornell LII text of §250 and the December 2025 Form 8993 instructions is non-optional. The §10.22 due-diligence standard treats the AI tool as “others’ work product” — meaning the practitioner who signs Form 1120 owns the answer regardless of which tool produced it. The same §7216 and Treas. Reg. §301.7216-3 consent obligations that apply to AI use on individual returns apply with equal force to the C-corp client whose §250 computation was assisted by an AI tool.

Frequently asked questions

Is FDDEI just a rename of FDII?

No. The rename is statutory and real, and the substance changed alongside it. The §250(a)(1)(A) deduction dropped from 37.5% to 33.34%. The QBAI / DTIR offset that defined the “intangible” framing was eliminated. Two new DEI exclusions were added at §250(b)(3)(A)(i)(VII). Interest and R&E no longer allocate against DEI. The reason “FDII” remains in circulation is that the Treas. Reg. §1.250 regs have not been re-issued and IRS Form 8993 has not been revised for the new label.

What is the new effective tax rate on FDDEI?

At the 21% §11(b) corporate rate: 21% × (1 - 0.3334) = approximately 14.0%. The pre-OBBBA rate was 13.125%. The TCJA-scheduled rate that would have applied for TY2026 absent OBBBA was 16.4%. Which framing your client uses depends on whether they compare to last year or to the scheduled step-down.

When does FDDEI first appear on a return?

TY2026 returns, filed in 2027, for calendar-year C-corp filers. TY2025 returns being filed in 2026 still use FDII and the December 2025 revision of Form 8993, but the June 16, 2025 IP and depreciable-property exclusion applies to in-scope transactions occurring after that date within TY2025. Fiscal-year filers with tax years straddling January 1, 2026 continue under FDII through the close of that fiscal year while applying the June 16, 2025 carve-out on a transaction-date basis.

Does an S-corp or partnership get a §250 deduction?

No. The §250 deduction is limited to domestic C-corporations and, via the §962 election, to individual US shareholders of CFCs electing corporate-equivalent treatment for §951 / §951A purposes. The IRS Form 8993 instructions explicitly exclude S-corps, REITs, and RICs. Partnerships and LLCs taxed as partnerships do not compute the deduction at the entity level; C-corp partners get the deduction on their distributive share.

Is licensing of IP for foreign use still FDDEI-eligible after OBBBA?

Generally yes, where the foreign-use documentation requirements under Treas. Reg. §1.250(b)-4 are satisfied. The new §250(b)(3)(A)(i)(VII) exclusion applies to sale or disposition of intangible property, not to ongoing royalty streams from licensing. The boundary between “license” (in) and “sale” (out) is expected to be addressed in the proposed regs Notice 2025-78 previewed. For now, document the licensing nature of the foreign-revenue stream carefully and treat the §367(d)(4) cross-reference as the operative definition of intangible property.

What about state conformity?

State-by-state and messy. New Jersey has issued explicit guidance treating the federal rename as a relabel for state-conformity purposes. Iowa has issued FDDEI / NCTI conformity guidance. Other states still reference the pre-OBBBA “FDII” and “GILTI” terms in their conformity statutes. State conformity is a downstream practitioner-pain story worth a separate piece; for any multi-state C-corp client with FDDEI exposure, run the state-conformity question separately from the federal computation.

Can I trust CoCounsel, Blue J, or TaxGPT for FDDEI research right now?

Treat their output as a first-draft pointer that requires verification against the current Cornell LII text of §250 and the December 2025 Form 8993 instructions. Blue J is structurally best-positioned because its retrieval is statute-anchored. CCH AnswerConnect and Bloomberg Tax are the cleanest editorial sources at the firm-subscription tier. Consumer LLMs (ChatGPT, Claude, Perplexity, Gemini, Copilot) have a documented record of returning stale post-OBBBA answers and should not be relied on for §250 work without primary-source verification.

Sources and citations

All URLs verified live as of 2026-05-12 (32 of 33 return HTTP 200; pro.bloombergtax.com returns 403 under a known bot-block pattern but is human-accessible). The article was assembled from approximately 33 primary and secondary sources across statutory text, regulatory guidance, professional-firm explainers, trade press, IRS forms, and practitioner AI-tool sentiment.

Statutory text and Treasury Regulations:

IRS guidance and forms:

Practitioner-canonical OBBBA explainers:

Trade press and tax-policy commentary:

State conformity:

AI-tool accuracy and currency: