LLC vs C-Corp for Spanish Founders: The Honest Breakdown
Spain and the United States have a bilateral income tax treaty, but it is one of the older treaties in the U.S. network and is less favorable than the treaties with Germany, France, or the Netherlands. For Spanish founders evaluating U.S. entity structures, the treaty's withholding rates and Spain's treatment of U.S. LLCs are the key factors.
The Treaty: Moderate Withholding Rates
Under the U.S.–Spain tax treaty, the withholding tax on dividends paid by a U.S. C-Corporation to a Spanish resident shareholder is reduced from the statutory 30% to 15% (or 10% if the Spanish shareholder owns at least 10% of the voting stock). For individual Spanish founders, the 15% rate is the standard treaty rate.
The sequence: the C-Corp pays 21% federal corporate income tax, then distributes dividends subject to 15% U.S. withholding. Spain's AEAT will tax the dividends as foreign income, but the U.S. withholding tax is generally creditable against Spanish income tax under the treaty.
The LLC Problem: Spain's Treatment of U.S. LLCs
Spain's tax treatment of U.S. LLCs has been a complex and evolving area. The Spanish tax authorities (DGT) have historically treated U.S. LLCs as opaque entities (similar to a Spanish SL or SA), meaning the Spanish founder is taxed on distributions from the LLC rather than on the LLC's underlying income as it is earned.
This creates a hybrid mismatch: the U.S. taxes the Spanish founder on the LLC's income as it is earned (pass-through), while Spain taxes the founder on distributions (as dividends). The interaction between these two tax systems can result in double taxation without full treaty relief, particularly if the LLC retains earnings. Spanish founders considering a U.S. LLC should obtain a binding ruling (consulta vinculante) from the DGT before proceeding.
Fundraising: C-Corp for Venture-Scale Businesses
Spanish founders building venture-scale businesses should incorporate as a C-Corporation. The U.S. VC ecosystem is built around Delaware C-Corps, and Spain's growing startup ecosystem — particularly in Madrid and Barcelona — has increasing connections to U.S. VCs. The 10–15% treaty rate makes the C-Corp a viable structure for Spanish founders who intend to distribute profits.
Operational Simplicity: Proceed with Caution on the LLC
For Spanish founders running a service business or bootstrapped product, the LLC appears operationally simpler — but Spain's opaque treatment of U.S. LLCs means the apparent simplicity can become a compliance problem. Before choosing an LLC, engage a Spanish tax advisor who specializes in U.S.–Spain cross-border structures.
Decision Table: LLC vs. C-Corp for Spanish Founders
| Factor | LLC | C-Corp |
|---|---|---|
| U.S.–Spain tax treaty | Hybrid mismatch risk; Spain treats LLC as opaque | Treaty reduces WHT to 10–15% |
| Spain DGT treatment | LLC generally treated as opaque (SL/SA equivalent) | Straightforward foreign corporation |
| VC fundraising | Not compatible with U.S. VC | Required for U.S. VC and accelerators |
| Compliance complexity | Complex; DGT ruling recommended | Cleaner; Form 5472 if foreign-owned |
| Best for | Rarely recommended without specialist advice | Venture-scale, VC-backed, most Spanish founders |
Practical Recommendation
Choose a C-Corp for most situations. The 10–15% treaty rate is reasonable, the structure is clean from both U.S. and Spanish perspectives, and it is compatible with U.S. VC fundraising.
Consider an LLC only with specialist advice. Spain's opaque treatment of U.S. LLCs creates a hybrid mismatch risk that requires careful navigation. If you are considering an LLC, obtain a DGT binding ruling before proceeding.
For the broader picture on this topic, see our guide on choosing the best US state for a non-resident LLC.