How to Issue a Tax-Compliant Invoice in Spain: AEAT Requirements

Issuing a tax-compliant invoice in Spain isn't just good practice — it's a legal requirement. The Agencia Estatal de Administración Tributaria (AEAT) sets strict rules about what every invoice must contain, how IVA should be calculated, and how long records must be retained.

Whether you're a freelancer, small business owner, or running a growing company, this guide covers everything you need to create invoices that satisfy AEAT requirements and keep your business audit-ready.

Why Invoice Compliance Matters in Spain

A compliant invoice does more than request payment — it creates a legal record that protects both you and your client. AEAT uses invoices to verify tax declarations, track IVA collections, and identify non-compliant businesses.

A compliant invoice does more than request payment — it creates a legal record that protects both you and your client. AEAT uses invoices to verify tax declarations, track IVA collections, and identify non-compliant businesses.

Non-compliant invoices can lead to:

• Rejected tax deductions for your clients (they can't claim input IVA)
• Penalties and interest from AEAT
• Failed audits and additional scrutiny
• Damaged business reputation and client trust

Mandatory Invoice Elements

Every tax-compliant invoice in Spain must include the following elements:

Every tax-compliant invoice in Spain must include the following elements:

1. Your business name and address — as registered with AEAT
2. Número de Identificación Fiscal (NIF) — your unique identifier issued by AEAT
3. Client's name and address — and their NIF for B2B transactions
4. Unique invoice number — sequential, without gaps or duplicates
5. Invoice date — the date of issue
6. Description of goods or services — clear and specific
7. Quantity and unit price — for each line item
8. Subtotal — amount before IVA
9. IVA amount — calculated at 21% standard, 10% reduced, 4% super-reduced
10. Total amount payable — including IVA

IVA Registration Requirements

In Spain, you must register for IVA if your taxable turnover exceeds No general threshold — all businesses must charge IVA (freelancers under módulos may have simplified regime).

In Spain, you must register for IVA if your taxable turnover exceeds No general threshold — all businesses must charge IVA (freelancers under módulos may have simplified regime). Once registered, you are required to:

• Charge IVA at the correct rate (21% standard, 10% reduced, 4% super-reduced) on all taxable supplies
• Issue IVA-compliant invoices for every transaction
• File IVA returns quarterly (Modelo 303), annual summary (Modelo 390)
• Remit collected IVA to AEAT
• Maintain records for at least 4 years

Record Keeping and Retention

AEAT requires businesses to retain all invoices, receipts, contracts, and financial records for a minimum of 4 years. Digital records are accepted — using invoicing software ensures your records are organised, searchable, and audit-ready.

AEAT requires businesses to retain all invoices, receipts, contracts, and financial records for a minimum of 4 years. Digital records are accepted — using invoicing software ensures your records are organised, searchable, and audit-ready.

E-Invoicing Status

Spain requires real-time VAT reporting through SII (Suministro Inmediato de Información) for large companies since 2017. A new B2B e-invoicing mandate under the Ley Crea y Crece requires all businesses to issue structured e-invoices from 2026 (large) and 2027 (SMEs).

Spain requires real-time VAT reporting through SII (Suministro Inmediato de Información) for large companies since 2017. A new B2B e-invoicing mandate under the Ley Crea y Crece requires all businesses to issue structured e-invoices from 2026 (large) and 2027 (SMEs). The system will use Facturae 3.2.2 format and integrate with the AEAT VeriFactu anti-fraud system.

Penalties for Non-Compliance

SII non-compliance: 0. 5% of invoice amount (min €300, max €6,000/quarter).

SII non-compliance: 0.5% of invoice amount (min €300, max €6,000/quarter). Late IVA filing: 5-20% surcharge. Missing registration: 150% of owed IVA.

Payment Methods for Spanish Businesses

To get paid faster, offer your clients multiple payment options. Popular methods in Spain include SEPA transfers, Bizum, credit/debit cards, domiciliación bancaria.

To get paid faster, offer your clients multiple payment options. Popular methods in Spain include SEPA transfers, Bizum, credit/debit cards, domiciliación bancaria. Including payment links directly on your invoices reduces friction and speeds up collection.

How Invoicemonk Helps

Invoicemonk is built for Spanish businesses. Our platform automatically includes all AEAT-required invoice elements, calculates IVA at the correct rate, generates sequential invoice numbers, and stores records securely for the required 4 years.

Invoicemonk is built for Spanish businesses. Our platform automatically includes all AEAT-required invoice elements, calculates IVA at the correct rate, generates sequential invoice numbers, and stores records securely for the required 4 years.

Create your first compliant invoice free →