What to know about e-invoicing in Spain

What matters for you as a freelancer

• ✓Agency OS already produces a compliant invoice for this country today — no extra setup needed on your side.
• ✓If your client asks for an e-invoice, you can send one immediately.
• ✓Keep an eye on the mandate date above — it determines when e-invoicing becomes mandatory rather than optional for domestic B2B.

What you don't need to worry about

• –You don't need to change your invoicing workflow ahead of the mandate — Agency OS already outputs the required format.
• –Cross-border invoices to clients in other countries aren't affected by this country's domestic mandate.

What must be on a valid B2B invoice

• ·Your NIF, and the client's NIF for most B2B invoices
• ·Full name and address of both parties
• ·Continuous, gap-free sequential invoice numbering
• ·Issue date
• ·Clear description of the goods or services
• ·Taxable base (base imponible)
• ·Applicable VAT rate and VAT amount in euros

Source: Agencia Tributaria — Contenido de las facturas — official source