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On 4 November, our tax and accounting team organised a webinar dedicated to the new Computerised Invoicing System (SIF) and Verifactu, a session that brought together numerous professionals interested in understanding how this regulation will impact their day-to-day work.

The arrival of the Verifactu system has generated much debate among companies and self-employed professionals. Although initially perceived as a new regulatory requirement for invoicing, it can actually become an opportunity to modernise internal processes and gain control over the business's economic and commercial information.

Complete this guide on Veri*factu and invoicing regulations with Part 1, where we answer questions about obligations, compatible programmes and managing errors or duplicates.

During the webinar on 4 November, some questions remained unanswered, particularly in relation to Veri*factu, Computerised Invoicing Systems (SIF) and the various invoicing programmes available on the market.

That is why we have prepared this Part 1, where you will find clear, practical and up-to-date answers on the main obligations, compatible programmes, simplified invoicing, the use of AEAT software and the management of errors or duplicates.

From 2026, new requirements for computerised invoicing systems (SIF) will come into force. If you have a business or are self-employed, it is important to know whether this change affects you, especially if you create invoices using Excel, Word or even by hand.

According to news published today, 2 December 2025, the Government, in a decision approved by the Council of Ministers through a decree-law, has decided to postpone the mandatory implementation of VERI*FACTU for companies and self-employed workers for another year.