Fiscal digitalization in Spain is advancing by leaps and bounds, and with it, the implementation of systems designed to ensure transparency and combat fraud. One of the cornerstones of this transformation is the ban on so-called "dual-use software," a practice whose days are numbered thanks to the arrival of VeriFactu. If you are a freelancer or own an SME, this directly affects you.
What is dual-use software and why is it banned?
Dual-use software, also known as double-entry accounting software, is any computer program that allows for the manipulation of a business's invoicing and accounting. Its purpose is plainly and simply fraudulent: to hide a portion of actual revenue to evade taxes like VAT or personal income tax (IRPF).
These programs allowed for the creation of a parallel "B" accounting system, the deletion of already issued invoices without a trace, or the alteration of data to reduce the tax base. The Law 11/2021, on measures for the prevention and fight against tax fraud, explicitly prohibits not only the use but also the production and possession of such systems.
The arrival of VeriFactu as a solution
To enforce this ban, the Spanish Tax Agency (AEAT) has made it mandatory to use invoicing systems that comply with the requirements of the VeriFactu system. These software programs guarantee the integrity, preservation, and traceability of every invoice issued.
A VeriFactu-compliant software performs two key actions:
1. Generates a record for each invoice, including a digital fingerprint or "hash" that makes it unalterable.
2. Sends these records to the AEAT, either immediately or at the end of the settlement period, depending on the system.
This creates an indelible digital trail of all invoicing, making it technically impossible to hide sales. If you want to delve deeper into how this system works, you can consult our What is VeriFactu? Guide for Freelancers in Spain.
Key dates you can't forget
Adapting to VeriFactu is not optional, and the deadlines are approaching. Although the regulation is already in effect for software developers, taxpayers must comply by the following dates:
* January 1, 2027: Deadline for all corporations and companies to adapt their invoicing systems.
* July 1, 2027: Deadline for freelancers and micro-SMEs to comply with the mandate.
Given our reference date (August 2026), the time to prepare is limited. It is crucial not to leave the transition to the last minute.
What does this mean for your day-to-day?
The end of dual-use software implies a fundamental change in how you manage your business:
* Goodbye to uncontrolled Excel: You will no longer be able to use spreadsheets or word processors for invoicing if they do not guarantee the requirements of integrity and inalterability.
* Obligation to use certified software: You must ensure that your invoicing program is certified as a VeriFactu system.
* Greater security and transparency: Although it's a change, it also gives you the peace of mind of knowing you are compliant with regulations and that your records are correct and secure.
Ignoring this obligation carries significant risks. The law includes harsh penalties for both users and manufacturers of non-compliant software. You can find more details in our article on Fines and Penalties for not complying with VeriFactu.
In short, VeriFactu marks the end of an era of opacity and the beginning of a digital, transparent, and more secure management for everyone. It's time to see this obligation not as a burden, but as an opportunity to modernize your business and secure its future.