FDDEI: The Export Tax Break C Corp Should Be Modeling for 2026

 

If a domestic C corporation sells goods or services to foreign customers, there is a permanent, built-in tax break sitting in the code for exactly that and starting in 2026, it just got more generous for a lot of businesses. It's called FDDEI, and it used to be called FDII. 

 

From FDII to FDDEI — What Actually Changed

 

Since the Tax Cuts and Jobs Act, U.S. C corporations have been able to claim a Section 250 deduction on foreign-derived intangible income (FDII), a deduction meant to reward U.S. companies for keeping valuable operations and IP onshore while selling to the rest of the world. The One Big Beautiful Bill Act (OBBBA), enacted in July 2025, restructured this deduction for tax years beginning after December 31, 2025, and renamed it foreign-derived deduction eligible income (FDDEI), dropping "intangible" from the name because the new calculation no longer separates tangible from intangible income at all.

 

Three changes matter most:

 

1. The QBAI carve-out is gone. Under the old FDII regime, a corporation had to notionally back out a 10% deemed return on its tangible depreciable assets (its "qualified business asset investment," or QBAI) before the remaining income qualified for the deduction. That reduction is eliminated starting in 2026. For exporters, manufacturers, this alone can meaningfully expand the amount of income eligible for the deduction.

 

2. Interest and R&E expense no longer have to be allocated against the income. Previously, businesses with significant interest expense or R&E costs often saw their FDII deduction shrink or disappear because those expenses had to be allocated and apportioned against the deduction-eligible income. Under FDDEI, that allocation requirement is gone, a direct benefit to leveraged companies and companies investing heavily in R&D.

 

3. The deduction rate dropped, and the effective rate rose slightly. The Section 250 deduction rate falls from 37.5% to 33.34%, nudging the effective U.S. tax rate on qualifying income from 13.125% up to about 14%. On its own, that's a modest give-back, but for many businesses, the QBAI and expense-allocation changes more than offset it by expanding the base the rate applies to.

 

Net effect: a business with a large tangible asset base, heavy R&D spend, or significant interest expense may see its deduction go up even though the rate went down. A business with none of those characteristics may see a small net cost from the rate change alone. 

 

 

Who This Applies To

 

FDDEI is only available to domestic C corporations, not S corporations, partnerships, or sole proprietorships. It covers income from:

 

• Sales of property to foreign persons for foreign use,

 

• Services provided to persons, or with respect to property, located outside the U.S., and

 

• Certain licenses of intangible property for foreign use.

 

One additional 2026 wrinkle: Treasury has clarified that gain from the sale or disposition of intangible or other depreciable/amortizable/depletable property is now excluded from deduction-eligible income for this purpose, a narrower, taxpayer-unfavorable change that applies to dispositions after June 16, 2025, ahead of the broader 2026 effective date for the rest of the FDDEI overhaul.

 

The Planning Angle

 

For clients organized as C corporations with a real export or foreign-services footprint, 2026 is the year to re-run the FDDEI numbers rather than assume last year's FDII calculation still applies. A few specific things worth checking:

 

• Companies previously "locked out" of FDII by a large QBAI base or heavy interest/R&E allocation may find they now qualify for a substantial deduction for the first time.

 

• R&E expensing elections need coordination. Because interest and R&E are no longer allocated against FDDEI, the interaction between the newly restored ability to immediately expense domestic R&E costs (also an OBBBA change) and the FDDEI calculation needs to be modeled together. Electing to accelerate one deduction can affect the size of another.

 

• Entity structure matters more, not less. Since this benefit is C-corp-only, it's another data point in any conversation about entity choice for a growing export-oriented business.

 

FDDEI doesn't require a new transaction, a new subsidiary, or a new election to exist, it's calculated off income the business already earns. The only real risk is not recalculating it under the new rules and leaving a bigger deduction on the table than the business claimed last year.