If you’re a freelancer or company based in Spain and you invoice a business customer established in another EU country, you’re almost certainly dealing with the reverse charge mechanism (RCM) — and getting the invoice format wrong is one of the most common reasons clients delay or dispute payment.

Here’s what a compliant invoice actually needs.

1. Why 0% VAT — and why it’s not “no VAT”

Under the general B2B rule for cross-border services (Art. 44 of the EU VAT Directive, transposed in Spain as Art. 69.Uno.1º of the Ley del IVA), the service is deemed supplied where the customer is established, not where you are. That means:

• You don’t charge Spanish VAT (21%).
• You don’t charge Dutch VAT either.
• The customer self-assesses VAT in their own country under reverse charge.

This is not the same as an export or a VAT-exempt supply — it’s a localization rule: the transaction simply falls outside the scope of Spanish VAT, so the invoice shows a 0% rate with a specific legal justification, not a blank VAT line.

2. The single most common error: the missing country prefix

For the reverse charge to be valid, both parties must be registered as intra-Community operators and their VAT numbers must carry the ISO country prefix:

• Spain: ES + NIF (e.g. ESY8524567Y, not just Y8524567Y)
• Netherlands: NL + number

Without the “ES” prefix, your VAT number isn’t presented as an intra-Community VAT ID — it just looks like a domestic Spanish tax ID. The customer’s finance/tax team can’t verify it against VIES (the EU’s VAT number validation system), and that’s often exactly why an invoice gets kicked back as “incorrect.”

Practically, this also means you need to be registered on the ROI (Registro de Operadores Intracomunitarios) with the AEAT before you can legally use the ES-prefixed number this way. If you haven’t requested ROI registration (Modelo 036), the invoice is technically defective even if everything else is right.

3. The wording your invoice must include

Alongside the corrected VAT numbers (both yours and the customer’s, ES/NL-prefixed), the invoice should carry an explicit reverse-charge statement. Standard wording:

“Operación exenta de IVA por inversión del sujeto pasivo (Art. 84.Uno.2º LIVA / Art. 196 Directiva 2006/112/CE del Consejo). VAT reverse charge applies — customer to account for VAT in the Netherlands.”

A bare “0%” or “N/A” in the VAT column, with no legal reference, is not sufficient.

4. Ongoing compliance: it doesn’t stop at the invoice

Once you’re issuing intra-Community services invoices, you’ll also need to:

• File Modelo 349 (recapitulative statement of intra-Community operations), declaring these sales.
• Report the income normally in your quarterly Modelo 130 (IRPF) and Modelo 303 (IVA) — the 349 doesn’t replace these, it supplements them.
• Keep the customer’s VAT number validation (VIES check) on file as evidence the reverse charge was correctly applied.

5. Important: RCM is a VAT question only

This is worth stating plainly, because it’s a frequent point of confusion with clients: the reverse charge mechanism has zero bearing on your income tax.

• VAT (IVA): not charged on the invoice; reverse-charged to the customer. This is what the 0%/RCM treatment governs.
• Income tax (IRPF): you’re taxed in Spain on your net freelance income (gross fees minus deductible expenses) at your applicable progressive rates, exactly as you would be regardless of who the client is or where they’re based.
• Social security (cuota de autónomo): also unaffected by RCM — it’s a separate, mandatory contribution based on your net income bracket.

So if a client has agreed to gross up your fee to cover “the tax,” that conversation is about your IRPF liability plus autónomo contributions — not about VAT, since no VAT is ever charged or retained on these invoices in the first place. Confusing the two (as sometimes happens when a client assumes “21%” is a VAT-related figure) leads to exactly the kind of dispute we’re addressing here.

For a deeper walkthrough of ROI registration and how it ties into your intra-Community invoicing obligations, take a look at our related guide: https://taxandlawspain.com/t-ly-kqfah/