American LLC in Spain: How the AEAT Taxes US Limited Liability Companies

The Fundamental Disconnect: US Transparency vs Spanish Opacity

The US Limited Liability Company is one of the most popular business structures in the world — flexible, simple to maintain, and by default treated as a "pass-through" entity for US federal tax purposes. But when the owner of a US LLC moves to Spain, they step into a collision between two fundamentally different legal traditions that creates some of the most complex and costly tax situations in cross-border planning.

The core problem is this: the IRS and the AEAT (Agencia Estatal de Administración Tributaria) classify the same entity in completely opposite ways. Understanding this divergence — and its consequences — is the first step towards avoiding what can amount to catastrophic double taxation.

How the IRS Classifies Your LLC

Under US federal tax law, the classification of a business entity depends on elections made under the "check-the-box" regulations (Treasury Regulations §301.7701-2 and §301.7701-3). The default classification for an LLC is:

• Single-member LLC: Classified as a "disregarded entity" — for federal tax purposes, it does not exist separately from its owner. All income, deductions and credits flow directly onto the owner's personal return (Schedule C, E or F depending on activity type).
• Multi-member LLC: Classified as a partnership — income flows through to each member in proportion to their interest, reported on each member's personal return via Schedule K-1.
• LLC with corporation election: If the members file Form 8832 (entity classification election), the LLC can be treated as a C-corporation for US tax purposes. An LLC can also make an S-corporation election via Form 2553 if eligible (US persons only, 100 shareholder limit, single class of stock).

The elegance of this system is its flexibility. The same legal entity can be treated differently for tax purposes simply by filing a form. This simplicity works perfectly within the US system — but it creates serious problems the moment the owner becomes tax resident in a country that does not recognise the check-the-box rules.

How Spain Classifies Your LLC: The Opaque Treatment

Spain does not follow US check-the-box elections. The AEAT classifies foreign entities using its own analytical framework, which compares the foreign entity to the closest Spanish equivalent based on the entity's legal characteristics — particularly its liability structure.

The key question under Spanish law is: do the members have limited liability? If yes, the entity is treated as opaque (corporation-like) — equivalent to a Spanish Sociedad Anónima (SA) or Sociedad de Responsabilidad Limitada (SL). If members have unlimited liability, the entity is treated as transparent (partnership-like).

Because LLC members have limited liability by definition — it is the defining characteristic of the LLC and is in the name — the AEAT consistently classifies US LLCs as opaque entities, regardless of how they are treated for US tax purposes. This position has been confirmed in multiple binding rulings (consultas vinculantes) from the Dirección General de Tributos (DGT), including DGT V0164-13 and subsequent decisions.

The Tax Consequences: Dividends, Not Business Income

The opacity classification has profound tax consequences for the Spanish-resident LLC owner. Because Spain treats the LLC as a corporation, any income you receive from the LLC is not treated as direct business income or self-employment income — it is treated as a dividend from a foreign corporation.

Under the LIRPF (Ley del Impuesto sobre la Renta de las Personas Físicas), dividends received by Spanish residents are classified as rendimientos del capital mobiliario (savings income) and taxed at the following rates:

• 19% on the first €6,000 of savings income
• 21% on the next €44,000 (€6,001–€50,000)
• 23% on the next €150,000 (€50,001–€200,000)
• 27% on amounts above €200,000
• 28% on amounts above €300,000 (from 2025)

This means that if you are a Spanish resident who owns a single-member LLC and the LLC earns €200,000 in profits, Spain does not automatically tax those profits as they arise (as it would if the LLC were treated as transparent). Spain will tax you when you receive a distribution from the LLC — but it will tax that distribution as a dividend at savings income rates, not as self-employment income at progressive rates (which would actually be higher at this income level).

The complication arises when you also consider the US tax treatment, which creates timing and double taxation mismatches.

The Double Taxation Problem: US Pass-Through + Spanish Dividend Tax

Here is where the LLC becomes a structural nightmare for Spanish residents. Consider a US citizen who moves to Spain and maintains their existing single-member LLC (disregarded entity in the US):

• In the US: The LLC's profits are attributed to the owner in the year they are earned (pass-through). The owner pays US income tax on those profits in year one — whether or not they are distributed.
• In Spain: Spain does not recognise the pass-through — it sees the LLC as a corporation. Spain only taxes the owner when a distribution is made. But when the distribution comes, Spain taxes it as a dividend at savings income rates (19-28%).

The result is potential double taxation: US tax on earnings as they arise, plus Spanish dividend tax on the same amounts when distributed. The foreign tax credit mechanism (Art. 80 LIRPF in Spain, Form 1116 in the US) provides partial relief, but there are credit limitation rules that prevent full offset in many cases — particularly because the income is characterised differently in each country.

S-Corporation vs C-Corporation: Does the US Election Matter?

An LLC taxed as an S-corporation in the US is transparent for US purposes (income passes through to shareholders) but is treated as opaque by Spain — a classic hybrid mismatch. The practical consequences differ from the C-corporation case:

• S-Corp (LLC or otherwise): US taxes the income in the year earned regardless of distribution. Spain taxes the shareholder only when a dividend is paid. If the shareholder manages the timing of distributions carefully — for example, retaining profits in the S-Corp and distributing in a year when Spanish progressive rates are lower — the mismatch can be partially managed. However, this creates a cash flow trap: profits taxed in the US but not yet taxed in Spain cannot be freely distributed without triggering Spanish dividend tax.
• C-Corp election: The LLC is opaque in both the US and Spain. The US taxes the corporation at 21% (federal rate). Spain taxes the shareholder on dividends received. The Spain-US DTT Art. 10 limits withholding at source to 15% (or 5% for qualifying corporate shareholders holding 10%+ of voting stock). The double taxation here is the classic economic double taxation of dividends — once at the corporate level, once at the shareholder level — partially mitigated by the treaty.

The Permanent Establishment Risk

A risk that many LLC owners in Spain overlook is the permanent establishment (PE) risk. Under Art. 5 of the Spain-US Double Tax Treaty and Art. 13 of Spanish domestic law (LIRNR), a foreign company has a PE in Spain if it carries on business through a fixed place of business in Spain, or through a dependent agent who habitually exercises authority to conclude contracts on behalf of the company.

If you are the sole manager of your LLC and you are making all significant business decisions — signing contracts, managing clients, directing operations — from Spain, the AEAT may argue that the LLC's effective management is in Spain and that the LLC has a PE in Spain. The consequences are severe: Spain would assert the right to tax the profits attributable to the Spanish PE at the standard corporate income tax rate of 25%, in addition to whatever personal taxation applies to distributions.

The PE risk is particularly acute for consultants, software developers, and professional services firms where the owner's intellectual labour is the primary business activity and all work is performed from Spain.

The Spain-US Double Tax Treaty: What It Does and Does Not Do

The 1990 Spain-US Double Tax Treaty (updated by protocols in 1996 and subsequent amendments) provides some protection but does not solve the fundamental classification mismatch:

• Art. 10 (Dividends): Limits withholding tax on dividends from the source country. For a US LLC paying dividends to a Spanish-resident shareholder, the US WHT is limited to 15% (or 5% if the recipient is a company holding 10%+ of voting stock). Spain then grants a credit for this WHT under Art. 80 LIRPF.
• Art. 7 (Business Profits): Business profits are taxable only in the country of residence unless the enterprise has a PE in the other country. This article protects LLC profits from Spanish tax in theory — but only if the LLC is classified as carrying on business, and only if there is no PE. Given the opacity classification, the AEAT may not apply Art. 7 at all, instead treating distributions as dividends under Art. 10.
• Hybrid mismatch rules (ATAD/DAC): EU-sourced hybrid mismatch rules (which Spain has implemented via the LIS) may further complicate the picture for LLCs with EU business activities.

Planning Options: What Can You Do?

If you are moving to Spain and own a US LLC, you have several structural options to consider — ideally before you become tax resident:

• Beckham Law (Art. 93 LIRPF): If you qualify for the Beckham regime, foreign-source income including dividends from a US LLC may be exempt from Spanish taxation for up to six years. This is often the most elegant short-term solution for LLC owners who qualify.
• Convert the LLC to a Spanish SL: For LLC owners who will be long-term Spain residents, closing the US LLC and operating through a Spanish SL removes the classification problem entirely. The Spanish SL pays IS (25%) and dividends are taxed in Spain in a fully integrated domestic system.
• Restructure as a C-Corporation: Converting to a US C-Corporation creates a fully opaque entity on both sides. While this eliminates the hybrid mismatch, it introduces full economic double taxation. This is rarely the optimal solution but may be preferable to the pass-through/dividend mismatch.
• Holding structure: For larger operations, a holding company in a treaty-efficient jurisdiction (the Netherlands, Ireland or Luxembourg) between the US LLC and the Spanish operations can optimise the withholding tax chain, though post-BEPS substance requirements must be respected.

LLC Type × Spain Treatment Comparison Table