Agencia Tributaria is a free mobile application available for Android devices that allows citizens to execute procedures with the Tax Agency easily and quickly, with or without user identification. The app offers a digital identity management system based on the reference number system of the Tax Agency, which allows access to services that require authentication, such as personal income tax returns, tax data, filing of the declaration, and consultation of the processing status. The app also provides access to procedures that do not require user identification, such as the collation of information or the presentation of documentation in the telematic registry.

Besides, the app provides informational services such as general news and searches. Users must provide personal data to log in, identify the device, and allow the Tax Agency to provide personalized services within the scope of its powers. The app also includes a legally valid privacy notice and ensures the corresponding protection of personal data. The app requires access permission to the device's camera for reading the QR that contains the Secure Verification Code (CSV) that guarantees the integrity of a document and storage permission to access the device's file system so that the citizen can save the PDF of a filed declaration or select a file with the documentation.