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All Sistemas Informáticos de Facturación (SIFs) operating under Spain’s VERI*FACTU regulation must pass a self-certification process before going into production. After self-certification, the software manufacturer must issue a declaración responsable (responsible declaration) that attests compliance with the applicable technical requirements. This declaration must be renewed for every new version of the SIF that is released.

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What is required

Article 13 of RD 1007/2023 establishes three obligations for SIF manufacturers:
  1. Self-certification — the manufacturer must verify that the SIF meets all technical and functional requirements defined in the regulation before the system is put into use.
  2. Responsible declaration per version — for each version of the SIF, the manufacturer must draft and sign a responsible declaration (declaración responsable) confirming the system’s compliance.
  3. Renewal on every new version — any update that results in a new SIF version requires a fresh declaration. A declaration issued for version 1.0.0 does not cover version 1.1.0.
Distributing or deploying a SIF without having issued the corresponding responsible declaration is a violation of RD 1007/2023. Ensure your declaration is ready before any production release.

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Where to find examples

The Agencia Tributaria publishes a reference template you can use as a starting point. You can find the official ejemplo de declaración responsable on the AEAT website. Review the template carefully — it documents the minimum required fields, including system identifier, version number, vendor details, and the specific articles of the regulation that are being declared compliant.

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Verifactu-PHP disclaimer

Verifactu-PHP is a building block for SIF developers, not a SIF itself. It is a PHP library that handles the generation of billing records, hash chaining, XML serialisation, and communication with the AEAT web service. Because it is not a SIF in its own right, this library is not distributed with a responsible declaration. Using Verifactu-PHP in your SIF does not transfer any compliance obligation to the library author. It is your responsibility to:
  • Audit the library’s source code and satisfy yourself that it meets the technical requirements of the regulation.
  • Issue your own responsible declaration covering your SIF as a whole, including the version of Verifactu-PHP you depend on.
  • Renew that declaration whenever you update Verifactu-PHP to a new release or release a new version of your SIF.
Verifactu-PHP is released under the MIT licence. You are free to use it in commercial projects, provided you retain the original authorship attribution as required by the licence.

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What to document in your declaration

At a minimum, your responsible declaration should record the following information:
  • SIF name and identifier — the $system->name and $system->id values you set on your ComputerSystem instance.
  • SIF version — the $system->version string that will appear in every billing record submitted to AEAT.
  • Verifactu-PHP version — the exact version of josemmo/verifactu-php listed in your composer.lock file.
  • Vendor details — the $system->vendorName and $system->vendorNif of the entity that developed and is responsible for the SIF.
  • Statement of compliance — an explicit declaration that the SIF meets the requirements of RD 1007/2023 and any applicable technical specifications published by the AEAT.
use josemmo\Verifactu\Models\ComputerSystem;

// These values must match exactly what appears in your responsible declaration
$system = new ComputerSystem();
$system->vendorName         = 'Acme Billing Solutions, S.L.';   // matches declaration
$system->vendorNif          = 'B12345678';                       // matches declaration
$system->name               = 'AcmeSIF';                        // matches declaration
$system->id                 = 'AC';                              // matches declaration
$system->version            = '2.3.0';                          // version declared to AEAT
$system->installationNumber = 'INST-00042';
$system->onlySupportsVerifactu    = true;
$system->supportsMultipleTaxpayers = false;
$system->hasMultipleTaxpayers      = false;
$system->validate();
Keep a copy of every responsible declaration you have issued, indexed by SIF version. The AEAT may request these documents during an inspection.

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