Spain-US Tax Treaty for Wyoming LLC Owners

If you are a Spanish resident running a Wyoming LLC, the Spain-US income tax treaty matters less than most blog posts pretend, and where it does matter, the real rules are far better than the outdated "30% on everything" framing you will find on older pages. The treaty is in force, it was substantially upgraded by a 2013 Protocol that finally entered into force on 27 November 2019, and that Protocol cut US withholding on most interest and royalties to zero. But for the typical SaaS, agency, freelance, or e-commerce founder, the treaty's withholding articles are not even the load-bearing part of your tax situation. This page walks through exactly what the treaty does, what it does not do, and the filing obligations that apply to your Wyoming LLC no matter what the treaty says.

Treaty status and what it means for Spain founders

The Spain-US tax treaty is in force. The IRS lists Spain on its "United States income tax treaties A-Z" page, and the underlying instrument is the "Convention Between the United States of America and the Kingdom of Spain for the Avoidance of Double Taxation," signed in 1990 and effective from 1990. That original convention is not the version that governs you today. In 2013 the two governments signed a Protocol that comprehensively modernized the treaty, and after a long ratification delay in the US Senate, the Protocol entered into force on 27 November 2019. Its reduced withholding rates apply to amounts paid or credited on or after that date.

This is the single most important fact to get right, because a large amount of older guidance (including, frankly, the data this page was built from) still describes the pre-2019 rules where US-source royalties and certain interest were withheld at the full 30% with no relief. That is no longer accurate. Under the 2013 Protocol now in force, the United States generally imposes 0% withholding on cross-border interest and royalties paid to a Spanish resident beneficial owner, and a tiered 0/5/15% schedule on dividends. The Protocol moved Spain into the group of US treaty partners with "exclusive residence-country taxation" of interest, royalties, certain direct dividends, and capital gains.

So when you read this page, treat the treaty as active and genuinely favorable on paper. The catch, covered in detail below, is that for most operating businesses there is no US-source income for the treaty's withholding articles to operate on in the first place. The treaty is your safety net for the specific slices of income that are US-source FDAP (dividends from US stocks, certain interest, royalties from US licensees). It is not the mechanism that keeps your Stripe revenue out of US tax. That job is done by the source rules and by the absence of US effectively connected income, which most non-resident founders never trigger.

A note on what "in force" does not mean: it does not mean automatic. You only get treaty rates if you document your status to the payer, and you only get the residence-country result in Spain if Spain's Agencia Tributaria agrees on how your LLC is classified. Both halves require paperwork.

Withholding rates by income type

The table below shows the default US statutory withholding rate on US-source fixed, determinable, annual, or periodical (FDAP) income paid to a foreign person — a flat 30% under IRC sections 1441 and 1442 — against the reduced rate available to a Spanish-resident beneficial owner under the treaty as amended by the 2013 Protocol. These rates are sourced from the Protocol text, the US Treasury Technical Explanation, and the IRS treaty documents for Spain. They assume you are the beneficial owner, you are a Spanish tax resident, and you satisfy the treaty's Limitation on Benefits (LOB) article.

Two corrections to flag against older versions of this page. First, royalties are 0%, not 30% — the pre-Protocol treaty taxed them, the in-force Protocol does not. Second, standard interest is 0%, not 10% in the ordinary case; the 10% figure only survives for narrow categories such as contingent interest. The dividend tiers are 0/5/15%; there is no general 10% rate for ordinary portfolio dividends, so any source describing a flat "10% dividend" rate for a typical individual Spanish shareholder is wrong. Pension funds resident in the other state can also reach 0% on dividends under specified conditions.

Does the treaty even matter for your LLC?

Here is the part most pages bury. For the overwhelming majority of Spanish founders, the treaty's withholding articles almost never get used, because there is little or no US-source FDAP income to withhold on. Understanding why saves you from over-engineering your taxes.

A single-member Wyoming LLC owned by a non-resident is, by default, a "disregarded entity" for US federal tax purposes. The income is treated as yours. The question that decides US taxation is not "did money pass through a US LLC" — it is "is the income US-source, and is it effectively connected with a US trade or business?" For a Spanish resident running a SaaS product, a marketing agency, a freelance consultancy, a dropshipping store, or a content business, the answer is usually no on both counts. The income is compensation for services you perform from Spain, or profit from goods and digital products sold to customers — and the source of services income is where the work is physically performed. Work done from Madrid or Barcelona is foreign-source, full stop. Foreign-source income earned by a non-resident with no US presence is simply outside the US tax net. There is nothing for the 30% to attach to and nothing for the treaty to reduce.

The two things that would pull operating profit into US tax are a US permanent establishment (PE) — under treaty Article 7 — or effectively connected income (ECI) under US domestic law. A PE generally means a fixed place of business in the US (an office, a dependent agent habitually concluding contracts on your behalf). ECI generally requires a US trade or business with meaningful US-based activity. A laptop in Valencia, a US bank account, a US registered agent, a Stripe account, and US customers do not, by themselves, create either. Most non-resident founders never come close. Where the treaty's Article 7 earns its keep is as a backstop: even if some borderline activity arguably looked like a US trade or business, Article 7 confirms your business profits are taxable only in Spain unless attributable to a US PE. That is a reassuring belt-and-suspenders, not the foundation.

So when does the treaty's withholding table actually bite? Only on genuine US-source FDAP: dividends from US corporations or US ETFs/stocks held in your name or your LLC's name, certain US-source interest, and royalties paid by a US licensee for use of your IP in the US. If your LLC holds US dividend-paying stock, the treaty drops 30% to 15% (or 5%/0% if you somehow hold a 10%+/80%+ corporate stake — rare for individuals). If a US company licenses your software and pays royalties, the 0% royalty rate is a real, claimable saving versus the 30% default. For everyone else, the honest answer is: the treaty is good to have and costs you nothing to claim, but it is not what is keeping your operating income US-tax-free. The source rules are.

How to claim: W-8BEN-E line-by-line + Form 8833 if needed

You claim treaty benefits on US-source income by giving the payer a Form W-8BEN-E (entity form) — not by filing anything with the IRS up front. There is an important nuance for single-member LLCs noted in the IRS Instructions for Form W-8BEN-E: a disregarded entity generally does not submit its own W-8BEN-E; instead its foreign owner provides the form. In practice, US payers' onboarding portals (Stripe, marketplaces, ad networks) collect a W-8 keyed to your LLC and EIN, so you will usually complete a W-8BEN-E reflecting the disregarded-entity structure. Complete it like this:

• Line 1 — Name of the beneficial owner. Use your LLC's exact legal name as on the Wyoming Articles of Organization (or your own name where the platform routes the disregarded entity to its owner).
• Line 2 — Country of incorporation: United States.
• Line 3 — Name of disregarded entity receiving payment, if the form is being completed in the owner's name and the LLC is the account holder.
• Line 4 — Chapter 3 status: check Disregarded entity for a single-member LLC. If you check disregarded entity, also indicate whether the entity is a hybrid making a treaty claim.
• Line 5 — Chapter 4 (FATCA) status: for an active operating business, "Active NFFE" is the common selection; complete the corresponding Part (Part XXV) certification.
• Line 6 — Permanent residence address: your real home address in Spain. Not a US address, not the registered agent's address.
• Line 9b — Foreign TIN: your Spanish NIF/NIE.
• Part III, Line 14 — Claim of treaty benefits. Check 14a (resident of Spain) and 14b, identifying the Limitation on Benefits provision you satisfy (for an active operating company, typically the "active trade or business" test).
• Part III, Line 15 — Special rates and conditions. State the article and rate, e.g., "Article 12 (Royalties), 0%" or "Article 10 (Dividends), 15%," and the type of income. Line 15 now requires extra explanation for business-profits/PE claims.

The form does not go to the IRS; it goes to each payer, and it is generally valid through the end of the third calendar year after signing, so renew before expiry or the payer reverts to 30%.

Form 8833 is a separate, IRS-filed disclosure — the "Treaty-Based Return Position Disclosure" under section 6114. You attach it to a US return when you take a treaty position that overrides the Code. Critically, the IRS provides an exception: routine reductions in 30% withholding on FDAP (dividends, interest, royalties) claimed via a W-8 generally do not require Form 8833, and positions affecting $10,000 or less of income are excepted. Where 8833 does matter is the business-profits / no-US-PE position — if you would otherwise have ECI but are relying on Article 7 to escape US tax, that position should be disclosed on a protective Form 1040-NR with Form 8833 attached. The penalty for a required-but-missing 8833 is $1,000 per failure for individuals (IRC section 6712). When in doubt on a PE/ECI position, file the protective return.

Form 5472 + pro-forma 1120 obligation ($25k penalty) regardless of treaty

No treaty article eliminates this, and it catches founders who assume "no US tax" means "no US filing." A foreign-owned single-member US LLC that is treated as a disregarded entity is a "reporting corporation" for purposes of IRC section 6038A. Each year it has a "reportable transaction" with its foreign owner (and a Wyoming LLC almost always does — capital contributions, distributions, payments), it must file Form 5472 attached to a pro-forma Form 1120. You complete only the identifying information on the 1120 and the substantive detail on the 5472; you are not computing corporate tax, you are reporting related-party transactions.

This is mandatory even if the LLC owes zero US tax, earned only foreign-source income, and qualifies fully for treaty residence-country treatment. The deadline tracks the 1120 due date (generally 15 April for a calendar-year filer, with a six-month extension available via Form 7004), and the filing goes to the dedicated IRS address/fax for these returns — not e-filed through consumer software in most cases. The penalty for late or non-filing is $25,000 per form, and it applies per year, with additional $25,000 increments for continued failure after IRS notice. This is the most expensive and most commonly missed compliance item for non-resident LLC owners, and the treaty offers no shelter from it whatsoever.

Separately, since FinCEN's March 2025 interim final rule, a US-formed entity such as your Wyoming LLC is now exempt from Beneficial Ownership Information (BOI) reporting under the Corporate Transparency Act; only foreign-formed entities registered to do business in a US state remain "reporting companies," and even those need not report US persons. So a domestically formed Wyoming LLC has no current FinCEN BOI obligation — but Form 5472 stands entirely on its own and is unaffected.

Common mistakes

• Believing the old "30% on royalties and interest" rule. That was the pre-2019 treaty. Since the 2013 Protocol entered into force on 27 November 2019, most interest and royalties to a Spanish beneficial owner are 0%. Claim it.
• Treating the treaty as the reason your operating income is US-tax-free. It is not. Foreign-source services income earned from Spain is outside US tax because of the source rules, not because of a withholding article. The treaty only governs genuine US-source FDAP.
• Skipping W-8BEN-E and eating the 30% default. Until a valid W-8 is on file with each payer, the payer is legally required to withhold 30%. No form, no rate.
• Letting the W-8BEN-E lapse. It expires at the end of the third calendar year after signing. An expired form reverts you to 30% silently.
• Missing Form 5472 + pro-forma 1120. The $25,000 penalty is per form, per year, and applies regardless of treaty benefits or zero tax. This is the number-one costly oversight.
• Confusing W-8BEN with W-8BEN-E. The individual form is W-8BEN; the entity/LLC form is W-8BEN-E. Use the entity form for the LLC structure.
• Ignoring the Spanish side. The Agencia Tributaria may treat your US LLC as transparent (income flows to your IRPF) or as a foreign company, and you may have Modelo 720 foreign-asset reporting if relevant holdings exceed the threshold. Get an asesor fiscal to confirm classification — the treaty's "residence-country taxation" only helps if Spain actually taxes you in the way you expect.
• Assuming a US bank account or US customers creates a US permanent establishment. They do not. A PE needs a fixed US place of business or a dependent agent concluding contracts; ordinary remote operation from Spain does not qualify.

Sources: IRS, "United States income tax treaties A-Z" and "Spain — Tax treaty documents" (irs.gov); US Treasury, "Technical Explanation of the Protocol Amending the Convention Between the United States and the Kingdom of Spain" and Treasury press release on the 2013 Protocol entering into force 27 November 2019; IRS Instructions for Form W-8BEN-E (Rev. Oct. 2021) and About Form 8833; IRS Form 5472 / IRC §6038A guidance; FinCEN, "FinCEN Removes Beneficial Ownership Reporting Requirements for U.S. Companies and U.S. Persons" (March 2025 interim final rule, fincen.gov). Wyoming LLC formation through wyomingllc.xyz is $397 all-inclusive with the Wyoming state filing fee included; an ITIN is a separate $297 add-on. This page is general information, not tax advice — confirm your specific position with a US CPA and a Spanish asesor fiscal.