VeriFactu Is Rapidly Approaching: Is Your Customer List Ready?

If you run a business in Spain, VeriFactu 2027 is coming, summer 2026 has been and gone, and here we are flying through autumn.

From 1 January 2027, companies must use billing software that meets Spain’s new VeriFactu rules. Self-employed workers (autónomos) and most other businesses follow on 1 July 2027.

Most of the conversation so far has been about software. But there’s a quieter problem hiding underneath: your customer data. New software can only send what you give it. If your customer list is messy, your invoices will be too.

What is VeriFactu, in plain English? (For those who don’t speak Spanish)

VeriFactu is Spain’s anti-fraud system for invoicing. Your billing software has to record every invoice that can’t be quietly changed later. Each invoice carries a QR code and a unique identifier, so the tax office can check it is genuine.

The deadlines were pushed back twice. They are now fixed by Royal Decree-law 15/2025:

• 1 January 2027 — companies paying corporate tax (Impuesto sobre Sociedades)
• 1 July 2027 — autónomos and other taxpayers

Businesses already using the SII reporting system, and those in the Basque Country and Navarra, have their own arrangements.

Using billing software that doesn’t comply can lead to fines of up to €50,000 per year. Not the kind of surprise anyone wants in their January post. Not a Happy New Year.

Why your data matters as much as your software

When you switch to VeriFactu-ready software, you’ll usually import your existing customers and products. That’s where the trouble starts. Typical problems include:

• Wrong or missing tax IDs. A NIF, NIE or CIF with a typo, or none at all.
• Duplicate customers. “J. Smith Ltd”, “John Smith Limited” and “Smith, J” all being one client.
• Old addresses. Customers who moved years ago but still sit in your system.
• Mixed languages and formats. English and Spanish names, different date formats and stray spaces.

Garbage in, garbage on an official invoice. And once an invoice is recorded under VeriFactu, it’s meant to stay that way. Corrections mean issuing rectifying invoices, which is extra admin you didn’t need.

What to do before the deadline

You don’t need to panic, but you do need to start. Here’s a simple checklist:

1. Talk to your gestor or software provider about which VeriFactu-ready system you’ll use.
2. Export your customer list into a spreadsheet and take an honest look at it.
3. Check every tax ID. Make sure each customer has a NIF, NIE, CIF or VAT number in the right format.
4. Merge duplicates so each customer appears once.
5. Update addresses and contact details, and delete customers you’ll never invoice again.
6. Tidy your product and service list so prices and descriptions are consistent.
7. Test the import with a small batch before moving everything across.

Doing this in October or November is far calmer than doing it on 30 December with a cup of coffee and a growing sense of dread.

Where I can help

I’m a Power BI and data consultant based in La Línea, working with businesses across the Costa del Sol and Gibraltar. I don’t sell billing software, and I’m not a tax adviser. Your gestor handles that side. What I do is get your data clean, consistent and ready to move, so your new system starts on the right foot.

A typical clean-up includes checking tax IDs, removing duplicates and producing a simple report showing what was fixed. If you’d like your customer list checked before 2027, send me a message on WhatsApp.

This post is general information, not tax or legal advice. Please confirm your own obligations with your gestor or accountant.

Sources

• Legal Today — Nueva prórroga VeriFactu: no será obligatorio hasta 2027 (4 Dec 2025): new dates under RDL 15/2025, QR code and unique identifier.
• Legálitas — Sanciones y multas por incumplir VeriFactu: fines up to €50,000 per year for users, SII and Basque Country/Navarra exclusions.
• Billing Information Systems (SIF) and VERI*FACTU