OBBBA (effective Jan 1, 2026) created two opposing forces for US-owned SaaS companies considering Singapore. FDII was renamed FDDEI with effective US rate around 14% on foreign-derived income - making the US C-Corp more competitive. NCTI raised the cost of foreign subsidiaries - making Singapore opcos more expensive. The optimal structure now depends on where IP and revenue actually sit. This piece walks through the three structural patterns for US-owned SaaS, runs the post-OBBBA math on each, and identifies the sweet spot.

This is a tax-structuring piece, not a Singapore-vs-Delaware comparison (see our Singapore vs Delaware guide for that). The question here is: given you have a US-owned SaaS company, what role should Singapore play in your structure?

The three structural patterns

  1. Model A - US C-Corp Only: Single US Delaware C-Corp serves all customers globally. Claim FDDEI on foreign-derived income. No Singapore entity.
  2. Model B - US C-Corp parent + Singapore opco subsidiary: US C-Corp owns 100% of Singapore Pte Ltd. Singapore Pte Ltd serves Asia customers, the US C-Corp serves US customers. NCTI applies on the Singapore profits at C-Corp level (~12.6% effective).
  3. Model C - Singapore Pte Ltd holdco at top: Singapore Pte Ltd is the parent; US C-Corp opco below. Rare for US founders - requires founder relocation or significant non-US dilution to navigate Section 7874 and Section 367 issues. See our reverse flip post.

What FDDEI does (and doesn't)

FDDEI (Foreign-Derived Deduction Eligible Income), formerly FDII, is a US tax incentive that gives a US C-Corp a deduction on income derived from selling/licensing to non-US persons or providing services for non-US use.

How it works:

What qualifies:

What doesn't qualify:

The last bullet is critical: if you route Singapore-side revenue through a Singapore Pte Ltd, you LOSE FDDEI on that revenue at the US C-Corp level. The Singapore opco recognizes the revenue, not the US parent.

Worked example: $5M ARR US SaaS, 60% US / 40% foreign customers

Facts: US C-Corp, $5M ARR, $3M from US customers and $2M from foreign customers (40% Asia, 30% Europe, 30% other). $1.5M operating expenses. $3.5M EBITDA. Single US founder owns 100%.

Model A - US C-Corp Only (claim FDDEI on $2M foreign revenue): Model B - US C-Corp + Singapore Pte Ltd subsidiary serving Asia ($800K revenue): Model C (reverse flip) - not run here. Section 367(d) costs typically dominate.

Model B saves ~$50K/year vs Model A in this fact pattern - meaningful but not huge. The savings grow as the Asia revenue share grows. Above 60% Asia revenue, Model B clearly wins. Below 30% Asia, Model A is simpler and competitive. The "sweet spot" for Singapore Pte Ltd subsidiary economics is roughly 40-70% foreign-customer revenue with material Asia concentration.

Why the Singapore opco wins for retained earnings

The 12.4-16% effective rate on Singapore-side profits (Singapore tax + NCTI) compares favorably to 21% federal corporate tax in the US C-Corp. The advantage is most pronounced when:

The advantage shrinks when you distribute every dollar back to the US C-Corp - dividends to the parent are exempt under Section 245A (no second tax), but the Singapore profits already paid Singapore tax and NCTI.

The "sandwich" pattern (US C-Corp → Singapore Pte Ltd → US LLC operating in Asia)

Sophisticated structures sometimes layer:

Why this can work: the Singapore Pte Ltd holds Asia-relevant IP and benefits from Singapore's tax treaties for Asia revenue. The US LLC handles US customer-facing operations. The US C-Corp parent maintains US LP optics. Transfer pricing between layers must be defensible.

Why it often doesn't work: the operational complexity of three entities (vs the Model B simplicity of two), the need for arms-length transfer pricing at every layer, and the increased Form 5471/8865/8858 filing burden. Most US SaaS founders end up at Model B.

PE risk and economic substance

If your Singapore Pte Ltd has no real Singapore-resident employees, no Singapore office, and no Singapore-based decision-making, the IRS may treat it as a US permanent establishment of the US C-Corp - completely defeating the structure. Substance requirements:

BEPS Pillar 2 doesn't directly hit most early-stage SaaS (EUR 750M revenue threshold), but if you scale into the in-scope range, Singapore's domestic top-up tax floors your effective rate at 15%, eliminating part of the Singapore advantage. Plan for this if your trajectory is to enterprise scale.

Banking and operational considerations

When the Singapore structure stops making sense

How Karman handles this

For Singapore Pte Ltd setup, accounting, GST registration, secretarial, and banking introductions - that's our core. We can incorporate the Singapore subsidiary in 1-3 business days and have it operational within 4-8 weeks (including bank).

For the US-side tax structuring (FDDEI documentation, transfer pricing memos, Form 5471/8992/8993 preparation, Section 250 election) - we partner with US international tax counsel and CPA firms who specialize in this. We coordinate but don't directly advise on US filings.

For the broader question of whether your structure should change, see our GILTI/NCTI guide for the individual-shareholder math, and our Singapore vs Cayman vs Dubai post if you're also considering offshore alternatives.

Official Sources

Frequently Asked Questions

Yes. FDII (Foreign-Derived Intangible Income) was renamed FDDEI (Foreign-Derived Deduction Eligible Income) under the One Big Beautiful Bill Act (OBBBA), effective Jan 1, 2026. The deduction is now 36.5% of FDDEI (down from 37.5% of FDII), giving an effective US federal rate of approximately 14% on qualifying foreign-derived income (up from 13.125%). The general structure - C-Corp sells/licenses to non-US persons, gets a deduction on the resulting income - is preserved. Documentation requirements got slightly tighter.

Yes, but watch the tax implications. If the US LLC is treated as a partnership or disregarded for US tax (the default), the Singapore Pte Ltd's NCTI flows through to the US members at individual rates - generally bad. If the US LLC has elected to be taxed as a C-Corp, the NCTI is captured at corporate level (21%, with cleaner FTC mechanics), then a second layer of tax applies on dividends to the LLC members. For most US founders, holding a Singapore Pte Ltd through a US C-Corp parent (not an LLC) is the cleanest structure if you anticipate US fundraising or want institutional optics.

Pillar 2 (15% global minimum tax) applies to MNEs with consolidated group revenue over EUR 750M. Below that threshold, none of this matters. Above it: Singapore implemented its Domestic Top-Up Tax (DTT) and Multinational Enterprise Top-Up Tax (MTT) effective from 2025, ensuring in-scope groups pay at least 15% on Singapore-source income. The US has its own Pillar 2 implementation in progress. For a US C-Corp with a Singapore subsidiary, in-scope groups will see the Singapore effective rate floored at 15% rather than the 5-8% SUTE-driven rate - eliminating part of the structural advantage.

If 90% of revenue is from US customers, FDDEI doesn't help much (FDDEI requires foreign-derived income), and a Singapore opco for 10% Asia revenue may not justify the operational complexity. Better approach: keep everything in the US C-Corp, claim FDDEI on the 10% foreign revenue, and revisit if/when Asia revenue grows past 30-40%. The Singapore restructuring really earns its keep when foreign revenue is 30%+ of total or when Asia is a strategic priority for the business.

FDDEI applies to the US C-Corp's foreign-derived income - so yes, if your US C-Corp directly serves Singapore customers (without a Singapore subsidiary), the income from those Singapore customers is FDDEI-eligible. But if you route Singapore revenue through a Singapore Pte Ltd subsidiary, the Singapore Pte Ltd recognizes the revenue, NOT the US C-Corp - so no FDDEI on that revenue. The trade-off: Singapore Pte Ltd at 5-8% effective rate vs FDDEI at ~14% on US C-Corp. Singapore Pte Ltd typically wins for retained earnings; FDDEI wins for distributions to US shareholders.