International clients in Spain: tax structure and LLC

Selling abroad from Spain can protect more margin when residence, VAT, contracts, payments, banking and a defensible LLC are set before scaling.

Selling abroad from Spain can protect more margin when residence, VAT, contracts, payments and a defensible LLC are structured before scaling.

Working with international clients while based in Spain creates a complex tax situation. Here's what you need to understand and how a US LLC can simplify things dramatically.

The challenge for Spanish freelancers with international clients

When you're autónomo in Spain and you serve clients in the US, Germany, Mexico, or anywhere outside Spain, you face several complications:

VAT complications: Digital services sold to businesses in other EU countries under B2B rules generally don't require charging Spanish VAT (reverse charge applies, per EU Directive 2006/112/EC). But for B2C sales to EU consumers, you may need to register for OSS (One-Stop Shop). Non-EU clients? Different rules again — services to non-EU businesses are generally exempt from Spanish VAT (Modelo 303 with "no subject" operations). The paperwork is relentless: Modelo 303 quarterly, Modelo 349 for intra-community, Modelo 390 annual summary.

Withholding taxes: Some countries (like the US under IRC §1441) apply withholding taxes on certain payments to foreign service providers. Getting these back requires filing foreign tax returns or proper W-8BEN-E documentation.

Currency exchange: Managing invoicing in multiple currencies while operating through a Spanish bank account is complex and costly. Spanish banks typically charge 2-4% markup on exchange rates plus wire fees of €15-50.

High Spanish income tax: All income, regardless of where it comes from, is subject to Spanish IRPF at progressive rates: 19% (first €12,450), 24% (€12,450-€20,200), 30% (€20,200-€35,200), 37% (€35,200-€60,000), 45% (€60,000-€300,000), and 47% above €300,000.

How a US LLC simplifies international billing

With a US LLC:

VAT is no longer your problem: Your US LLC invoices clients for services. As a US company, you don't charge European VAT on business-to-business international services. Your clients handle the VAT in their own countries via reverse charge. No Modelo 303 with international complications. No Modelo 349 for intra-community operations. No OSS registration for B2C.

You invoice in dollars: No more currency complications at the invoicing level. Your LLC receives dollars in its selected USD rail, and you convert to euros when you need to at real market rates through Wise Business (typically 0.4-0.6% for EUR/USD vs. 2-4% at Spanish banks).

Tax optimization: The LLC's net profits (after legitimate business expense deductions) are what you declare in Spain. The effective taxable amount is lower than your gross revenue.

Professional credibility: International clients, especially US companies, prefer working with a US business entity. You invoice with your LLC name, your EIN, and your Mercury bank details. Professional.

What you must still declare in Spain

A US LLC doesn't make you tax-free in Spain. You must:

• Declare all LLC profits in your Spanish IRPF tax return
• File Modelo 720 if your foreign assets exceed €50,000
• Maintain proper documentation of all LLC income and expenses
• Comply with Spanish tax resolution <a href="https://petete.tributos.hacienda.gob.es" target="_blank" rel="noopener">DGT</a> V0290-20 regarding treatment of foreign entity income

The difference is in how much you declare, after deducting real business expenses, and the potential to optimize your overall tax position.

Spain-US double taxation treaty

Spain and the United States have a Double Taxation Convention (DTC). This means:

• You won't pay taxes in both countries on the same income
• The treaty provides rules for which country has taxing rights on different types of income
• It may provide tax credits for taxes paid in one country against your liability in the other
• Article 7 (Business Profits) generally gives taxing rights to the country of residence for services performed online

Practical example with real numbers

María is a UX designer in Barcelona. She bills €8,000/month (€96,000/year), all to US and UK companies.

As autónomo:

• Autónomo social security: ~€450/month (€5,400/year)
• IRPF quarterly advances (Modelo 130): 20% of net income
• Annual IRPF at effective rate ~33%: ~€31,680
• VAT paperwork: quarterly Modelo 303, annual Modelo 390
• Total tax burden: ~€37,080 (38.6% effective)
• Net after taxes: ~€58,920

With LLC (properly structured):

• LLC deductible expenses: €20,000/year (software, tools, hardware, Exentax fees, coworking, training)
• Net LLC profit: €76,000/year
• Declared in Spain, IRPF on €76,000: ~€21,000 (effective ~27.6%)
• LLC costs (formation amortized + annual maintenance): ~€1,500/year (year 1 ≈ €2,000 with formation)
• Total burden: ~€22,400 (23.3% effective)
• Net after taxes: ~€73,600

Annual savings: ~€14,680: legally, transparently, and sustainably.

What information you need to keep

For proper compliance with both <a href="https://www.irs.gov" target="_blank" rel="noopener">IRS</a> and Spanish tax authorities:

• All invoices issued by your LLC
• All expense receipts and documentation
• Bank statements showing income and distributions
• LLC operating agreement
• EIN documentation
• Form 5472 copies for cross-reference
• Modelo 720 filing (if applicable)

The financial tools that make international taxation simple

You don't need to be an expert in international tax law. You need the right structure and the right team. Here's what we set up for every client:

The W-8BEN-E: your tax treaty tool

When your LLC provides services to US clients, they may ask you to complete a W-8BEN-E form. This tells the US client:

• Your LLC is a foreign entity
• Your country of tax residence
• Whether a tax treaty reduces or eliminates US withholding
• Your EIN

Without a properly completed W-8BEN-E, US clients may withhold 30% of your payment. With it, the withholding may be reduced to 0% (depending on the treaty between the US and your country).

At Exentax, we review the payer documentation package before anything is signed, so the W-8 path matches the client, entity and payment flow.

To keep going on this thread, <a href="/en/blog/us-llc-with-no-federal-tax-when-it-fits">Legal LLC tax optimization: what is real and what is noise? The truth about tax optimization</a> fills in a nuance this guide only touched on.

International clients do not automatically make a structure international for tax purposes. The important review is where work is performed, where management sits, how contracts are signed and whether Spanish tax exposure remains attached to the founder.

International clients change the commercial picture, but not automatically the founder's tax residence. The key is whether contracts, delivery, management, invoices and bank flows support the way the income is being reported.

> <a href="/en/book">Review my case</a>

• Mercury: it can support USD operations when the LLC has a clean banking file. Prepare the business description, invoices, backup account and KYC/KYB response before relying on it.

• Payoneer operates through European entities (Payoneer Europe Ltd, Ireland) that are also in scope for CRS for clients resident in participating jurisdictions.

FinCEN and IRS reporting requirements moved recently; the current state is:

• EIN and notice. Without an EIN you cannot file Form 5472. The IRS does not warn before imposing penalties; you find out when an EIN is flagged or a later filing is rejected.

If it is not clean here, every downstream assumption becomes negotiable in front of the authority. Exentax closes the gap with a reviewed record and a clean execution path.

Mistakes in invoicing and reporting international clients

If it is not clean here, every downstream assumption becomes negotiable in front of the authority.

1. VAT does not apply in most cases

VAT treatment depends on client status, place of supply, service type and evidence. If the invoice says one thing and the contract or payment flow says another, the tax answer stops being clean.

2. The double-taxation relief

If it is not clean here, every downstream assumption becomes negotiable in front of the authority.

What you actually pay as a Spanish autónomo with international clients

For a Spanish autónomo, the problem is not just tax percentage; it is that every international client still lands inside personal income, social-security cost, invoices and cash-flow pressure.

Option 1: Stay as a Spanish autónomo

The numbers and the calendar matter - get either wrong and the rest unravels.

Option 2: US LLC + optimised tax structure

The LLC route needs a documentary boundary from the start: client contracts, US banking, distributions, residence file and annual compliance cannot be reconstructed casually at year-end.