The US-Spain tax treaty withholding rates replace the standard 30% US rate on cross-border passive income with 0%, 5%, or 15% on dividends, 0% on most interest, and 0% on royalties. The rate you get depends on what kind of income it is, who owns what, and whether you file the right form before the payment goes out. Miss the paperwork and the payer will withhold at 30%, leaving you to chase a refund. The current rates come from a Protocol signed in 2013, ratified by the US Senate on July 16, 2019, and in force since November 27, 2019.1Internal Revenue Service. Spain – Tax Treaty Documents
Dividend Withholding Rates
Without the treaty, US-source dividends paid to a non-resident are withheld at 30%.2Internal Revenue Service. Withholding on Specific Income The treaty sets three lower rates based on the recipient’s stake in the paying company.
- 0% when a parent company owns at least 80% of the paying company’s voting stock and has held that stake for the 12 months before the dividend is declared, provided the Limitation on Benefits requirements are met. Qualifying pension funds also get the 0% rate.3U.S. Department of the Treasury. Technical Explanation of the Protocol Amending the Convention Between US and Spain on Income Taxes
- 5% when a corporate shareholder directly owns at least 10% of the voting stock of the payer.
- 15% on everything else, including portfolio dividends paid to individuals.4Agencia Tributaria. The United States
REITs and SOCIMIs
US Real Estate Investment Trusts and Spanish SOCIMIs pass through real estate income, and the treaty treats them differently from ordinary corporations. For US REIT dividends paid to a Spanish resident, the 15% rate applies only if the recipient holds no more than 5% of a publicly traded REIT, or no more than 10% of a diversified REIT (one where no single property exceeds 10% of the REIT’s total real estate value). Larger holdings default to the full 30% statutory rate. Pension funds can reach the 0% rate on REIT dividends if they hold 10% or less of the REIT or the REIT is diversified.3U.S. Department of the Treasury. Technical Explanation of the Protocol Amending the Convention Between US and Spain on Income Taxes
Spanish SOCIMI dividends paid to US residents cap at 15%, with 0% available only for qualifying pension funds.4Agencia Tributaria. The United States
Interest Withholding Rate
The Protocol wiped out source-country tax on most interest. A US payer sending interest to a Spanish resident (or the other direction) withholds nothing, and the income is taxed only in the recipient’s country.5U.S. Senate Foreign Relations Committee. Explanation of Proposed Protocol to the Income Tax Treaty Between the United States and Spain – JCX-67-14
Two carve-outs keep US withholding alive on specific US-source interest. Contingent interest, where the payment amount depends on the borrower’s receipts, sales, or income and doesn’t qualify as portfolio interest under US law, can still be taxed at up to 10%. Excess inclusion income from real estate mortgage investment conduits (REMICs) remains fully taxable at 30%.3U.S. Department of the Treasury. Technical Explanation of the Protocol Amending the Convention Between US and Spain on Income Taxes
Royalty Withholding Rate
Royalties are 0% at source under the current treaty. The original 1990 convention allowed the source country to tax royalties at up to 10%,6Internal Revenue Service. US-Spain Tax Treaty Technical Explanation 1990 and the Protocol eliminated that entirely. Copyrights, patents, trademarks, and similar intellectual property royalties now flow across the border without withholding, taxed only where the beneficial owner resides.5U.S. Senate Foreign Relations Committee. Explanation of Proposed Protocol to the Income Tax Treaty Between the United States and Spain – JCX-67-14 The recipient’s status as individual or corporation doesn’t change the rate.
Who Qualifies for These Rates
The reduced rates are only available to residents of the US or Spain. Residency here means you’re subject to tax in that country based on your home, residence, place of management, or similar connection. Holding citizenship isn’t enough on its own if you actually live and pay tax in a third country.
Beyond residency, corporate recipients must clear the treaty’s Limitation on Benefits (LOB) clause, which is designed to block entities that are set up in one of the two countries only to access the reduced rates. The most commonly used LOB tests are an ownership and base-erosion test, a public trading test, and an active trade or business test. Under the active trade or business route, the entity must run substantial operations in its country of residence, and the income claimed under the treaty must be connected to or complementary to that business. Managing investments for your own account doesn’t qualify as active trade or business unless you’re a regulated bank, insurance company, or securities dealer. Pension funds qualify if more than 50% of their beneficiaries reside in either the US or Spain.3U.S. Department of the Treasury. Technical Explanation of the Protocol Amending the Convention Between US and Spain on Income Taxes
Claiming Reduced Rates on US-Source Income
Treaty rates don’t apply by default. You have to hand documentation to the US payer before the payment goes out.
Spanish resident individuals give the payer a completed IRS Form W-8BEN, which certifies foreign status, cites the treaty article, and states the claimed rate.7Internal Revenue Service. Form W-8BEN – Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting Corporate and other non-individual beneficial owners file Form W-8BEN-E instead, which has extra sections for showing LOB compliance.8Internal Revenue Service. About Form W-8 BEN
Deliver the form to the withholding agent or financial institution before the payment date. The payer applies the reduced rate at source. A W-8BEN stays valid for three years from the signing date, so renewal is a recurring task.
Claiming Reduced Rates on Spanish-Source Income
US residents receiving Spanish-source income prove their US tax residency to Spain’s Agencia Tributaria with IRS Form 6166, a certification letter on Treasury stationery. To get one, file IRS Form 8802 and pay a nonrefundable user fee: $85 for individuals, $185 for entities.9Internal Revenue Service. Instructions for Form 8802 – Application for United States Residency Certification Processing takes several weeks, so apply early.
If you have taxable Spanish-source income such as rental income or gains from Spanish real estate, you also file Spain’s Modelo 210. Deadlines vary by income type: quarterly for most taxable income, within four months of a real property sale, and annually for imputed income from urban real estate.10Agencia Tributaria. IRNR Declaration Without Permanent Establishment – Model and Declaration Deadline
Recovering Over-Withheld US Tax
If a payer withheld the full 30% because your W-8BEN wasn’t in place, you get the excess back by filing a US nonresident return, Form 1040-NR. The IRS allows a simplified path when your only reason for filing is a refund of over-withheld tax: complete Schedule NEC with the income entered in the column matching the treaty rate, and attach the Form 1042-S showing the withholding.11Internal Revenue Service. Instructions for Form 1040-NR (2025) When your treaty claim overrides a US domestic law provision, attach Form 8833 to disclose the treaty-based position.12Internal Revenue Service. About Form 8833 – Treaty-Based Return Position Disclosure Under Section 6114 or 7701(b)
The Form 8833 Penalty
Skipping Form 8833 when it’s required carries a $1,000 penalty per failure for individuals and non-C corporations, or $10,000 per failure for C corporations.13Office of the Law Revision Counsel. 26 US Code 6712 – Failure to Disclose Treaty-Based Return Positions The penalty stacks on top of any other tax penalties. The IRS can waive it for reasonable cause and good faith, but that’s not a strategy to plan around. Professional preparation of Form 1040-NR with a Form 8833 disclosure typically runs $400 to $700.
State Taxes Aren’t Covered
Federal tax treaties don’t override state income taxes. The reduced rates protect you at the federal level only. States including California, New York, New Jersey, Connecticut, and Pennsylvania don’t honor federal treaty benefits when they calculate state income tax.14Internal Revenue Service. State Income Taxes A Spanish resident receiving dividends from a California company might owe no federal tax beyond the treaty rate and still face a California bill. Check with the relevant state tax department before assuming the treaty covers the whole picture.
Avoiding Double Tax on What’s Still Withheld
When the source country keeps some taxing right (15% on portfolio dividends is the common case), the foreign tax credit prevents you from paying twice on the same income. A Spanish resident who had 15% withheld on US dividends claims a credit for that US tax on the Spanish return, reducing Spanish tax on the dividend by what was already paid to the US.4Agencia Tributaria. The United States US residents do the mirror image on Form 1116, crediting Spanish tax against their US liability on the same income.
The net effect: on any given income stream you end up paying tax at roughly the higher of the two countries’ rates, not the combined total. Claiming the credit requires reporting the foreign-source income and attaching proof of the tax paid abroad, so keep every withholding statement and foreign tax receipt from the moment income starts flowing.