GILTI and FDII Rules 2026: Tax Planning for Indian Startup Founders with US C-Corps

If you’re an Indian founder building a US C-Corporation, congratulations—you’ve chosen a structure that attracts investors and offers strong legal protection. But here’s what many international entrepreneurs don’t know: the US tax rules for foreign-owned C-Corps are changing dramatically in 2026.

The One Big Beautiful Bill Act (OBBBA), passed in July 2025, fundamentally reshapes how your US company will be taxed on global income. The changes are complex, but understanding them now could save you thousands in taxes.

In this guide, we’ll break down what these changes mean for you, how they affect your bottom line, and what tax planning steps to take before the 2026 deadline.

What Are GILTI and FDII? A Quick Primer

GILTI (Global Intangible Low-Taxed Income) and FDII (Foreign-Derived Intangible Income) are US tax regimes that apply specifically to C-Corporations with international operations or income sources.

GILTI is the US tax on profits earned by your foreign subsidiaries or controlled foreign corporations (CFCs). It functions as a minimum tax to ensure your foreign profits aren’t taxed at rates below a certain threshold.

FDII is the opposite—it’s a tax break. It gives US corporations a deduction on intangible income earned from foreign sales. Think of it as an export incentive to keep intellectual property and valuable assets in the United States.

If you operate only in the US, GILTI and FDII may not apply to you. But if your US C-Corp has international clients, sells software globally, or owns foreign subsidiaries, you need to pay attention.

The Major Changes Coming in 2026

GILTI Becomes NCTI (Net CFC Tested Income)

Beginning in 2026, the OBBBA rebrands the global intangible low-taxed income (GILTI) regime as “net CFC tested income” (NCTI) and makes several substantive changes that change the planning playbook.

But more important than the name change are the new rules:

• The effective tax rate increases. The global intangible low-taxed income (GILTI) regime has been renamed net CFC tested income (NCTI), with an increased effective tax rate of 12.6% (up from 10.5%).
• The QBAI deduction disappears. Most notably, the 10% QBAI return is eliminated, so capital-intensive CFCs that previously generated little or no GILTI may now produce sizeable NCTI inclusions. This is significant—if your foreign subsidiary owns tangible assets like equipment or inventory, you’ll now pay tax on more income.
• Your Section 250 deduction shrinks. The Section 250 deduction is reduced from 50% to 40%, and the deemed-paid foreign tax credit haircut is lowered from 20% to 10%. A lower deduction means higher effective taxes on your NCTI.

In plain English: if you have a foreign subsidiary, expect to pay more US federal tax on its profits starting in 2026.

FDII Becomes FDDEI (Foreign-Derived Deduction-Eligible Income)

Beginning in 2026, FDII will become known as foreign-derived deduction-eligible income (FDDEI).

The good news: FDDEI actually offers a slightly better deal than FDII under the new rules.

• You get a permanent 33.34% deduction. The OBBBA fundamentally reshaped foreign derived intangible income (FDII) by rebranding it as “foreign-derived deduction eligible income” (FDDEI), permanently setting the Section 250 deduction at 33.34%. This produces an effective tax rate of approximately 14% on qualifying income from serving foreign markets for tax years beginning after Dec. 31, 2025.
• The QBAI deduction is eliminated here too. OBBBA eliminated the QBAI exclusion. For tax years starting on or after Jan. 1, 2026, DEI will be determined without a reduction for QBAI. While this sounds negative, it actually broadens your eligible income base.

For Indian founders with US C-Corps selling SaaS, digital services, or software to foreign markets, FDDEI can be a valuable tax deduction—but only if you structure correctly.

How These Changes Impact Your US C-Corp

Higher Tax Bills on Foreign Income

If your US C-Corp earns income from India or other foreign markets, you’ll face a higher effective tax rate on that income. The 12.6% minimum tax on NCTI is a real cost, and the 14% effective rate on FDDEI is also higher than many founders expect.

This applies even if you don’t have a foreign subsidiary—if your US company itself earns foreign-source income, NCTI/FDII rules apply.

Changes to Foreign Tax Credit Calculations

There is a 20% reduction to GILTI-related foreign income taxes eligible for credit in the U.S. Beginning in 2026, the NCTI rules will change this reduction percentage to 10%, increasing the amount of foreign income taxes eligible for credit.

This is actually positive for you if you pay taxes in India on your US company’s foreign-source income. You’ll be able to credit more of those Indian taxes against your US tax bill.

Why This Matters Most for Indian Founders

As an Indian founder, you face a unique situation: your US C-Corp pays US federal tax (21%) on its global income, and then you may pay Indian tax on the same income when it’s repatriated. The DTAA (Double Taxation Avoidance Agreement) between the US and India helps, but it’s complex.

The 2026 changes mean you need to model your tax position now, before the rules take effect.

Tax Planning Strategies for 2026

Strategy 1: Accelerate Foreign-Derived Income into 2025

If you can close major contracts with foreign clients before December 31, 2025, consider doing so. The old FDII rules (37.5% deduction, producing a 13.125% effective rate) are more favorable than the new FDDEI rules.

This window is closing fast. Work with a cross-border accountant to identify opportunities.

Strategy 2: Document Everything Related to Foreign Tax Credits

With the FTC haircut improving from 20% to 10%, proper documentation of foreign taxes paid becomes even more valuable. If your US company or its foreign subsidiary pays Indian corporate taxes, trademark filing fees, or other levies, keep meticulous records.

The IRS will scrutinize these credits, especially for companies with foreign owners.

Strategy 3: Review Your Business Model for FDDEI Eligibility

If your US C-Corp is selling intangible goods or services to foreign customers—think SaaS, software licensing, consulting, or digital content—you may qualify for the FDDEI deduction on that income.

But the calculation is nuanced, and not all income qualifies. Work with a tax professional to identify which revenue streams could be eligible. The deduction is permanent under OBBBA, so getting this right has long-term value.

Strategy 4: Reassess Your Entity Structure Now

If you’re still deciding between an LLC and C-Corp, remember: These updates could unlock new tax planning advantages for capital-intensive companies — but are only available to C corporations.

The NCTI and FDDEI regimes don’t apply to LLCs. If you’re a pass-through entity, you don’t get the deduction benefits of these rules. This makes C-Corps more attractive for founders planning significant foreign income.

Strategy 5: Plan for Compliance Early

Starting in 2026, your tax returns will need to properly report NCTI and FDDEI calculations. This is not something you can rush in April 2027. Your accountant will need to understand your business model, your foreign subsidiaries (if any), and your income sources.

Engage a CPA or cross-border tax advisor familiar with the new rules before January 1, 2026.

How e-startup.io Can Help

Navigating US entity formation is the first step—but staying compliant with changing tax rules is the marathon. At e-startup.io, we help Indian founders and non-US entrepreneurs form US LLCs and C-Corporations remotely. But we also understand the downstream tax implications.

When you set up your C-Corp with e-startup.io, we ensure your entity is structured with these tax rules in mind. We help you understand whether a C-Corp or LLC makes sense for your specific situation, taking NCTI and FDDEI rules into account.

While we don’t provide tax advice, we connect you with cross-border tax professionals who specialize in the India-US tax relationship and can model your specific tax position under the new rules.

We also handle the nuts and bolts: EIN registration, registered agent services, and ensuring your C-Corp is properly documented from day one. Clean formation records make compliance easier down the road.

Key Takeaways

• The changes to GILTI (now NCTI) and FDII (now FDDEI) become effective in 2026 and will significantly change the tax planning for multinational businesses.
• The effective tax rate on foreign income is rising, but the rules are permanent now—so you can plan with confidence.
• The elimination of QBAI deductions means more income is taxable, but it also broadens the base for FDDEI benefits.
• Foreign tax credit rules are improving slightly, which helps Indian founders manage double taxation.
• These rules apply only to C-Corporations, not LLCs. Your entity choice matters.
• Now is the time to model your tax position and accelerate beneficial transactions into 2025 if possible.

Frequently Asked Questions

1. Do NCTI and FDDEI rules apply to my US LLC?

No. These rules apply only to C-Corporations. If you have a pass-through entity (single-member LLC, multi-member LLC, or S-Corp), NCTI and FDDEI don’t directly affect you. However, you may still have other reporting obligations depending on your ownership structure and foreign income sources.

2. I have a US C-Corp with a foreign subsidiary in India. Will my taxes go up in 2026?

Likely yes, under the new NCTI rules. The elimination of the QBAI deduction and the reduction in the Section 250 deduction mean that profits from your Indian subsidiary will face a higher minimum tax in the US. However, the improvement in the foreign tax credit haircut (20% to 10%) may partially offset this. A detailed tax model is essential.

3. My US C-Corp serves foreign clients. Can I benefit from FDDEI?

Possibly. FDDEI applies to intangible income derived from serving foreign markets. If you sell SaaS, digital services, or software to foreign customers, you may qualify for the deduction. The calculation is specific to your business model, and not all foreign-source income qualifies. Consult a cross-border tax professional to model your situation.

4. When should I file my 2026 tax return to ensure compliance with the new rules?

Your 2026 C-Corp tax return (Form 1120) will be due in April 2027 (with extensions available). But your tax planning should start now, in 2025. Work with your accountant to ensure your business records and transaction documentation support your NCTI and FDDEI positions before tax season arrives.

5. I’m forming a US C-Corp now. Should I worry about these 2026 changes?

Yes, you should be aware of them, but don’t panic. Use this knowledge to structure your entity correctly from the start. Ensure clean formation records, proper documentation of foreign income sources, and early engagement with a cross-border tax advisor. Getting ahead of compliance makes the transition to 2026 rules seamless.

Next Steps: Take Action Before 2026

The new tax rules are coming, and waiting until April 2027 to understand their impact on your bottom line is a mistake. Start now.

If you’re forming a US C-Corp or LLC for the first time, let e-startup.io handle the registration and entity setup. We’ll make sure your entity is properly formed, your EIN is issued, and your registered agent is in place. From there, you can focus on the tax planning with a specialist accountant.

Visit e-startup.io today to form your US company remotely. No visa required. No US address needed. All the legitimacy of a US business, no matter where you’re based.

Then, schedule a call with a cross-border tax advisor to model your specific NCTI and FDDEI position under the 2026 rules. The time to plan is now—not in April 2027.