The Spanish Tax Agency offers a free mobile application for smartphones and tablets that allows citizens to easily carry out procedures and receive personal notifications and updates without having to travel. The app provides a digital identity management system based on a reference number, Cl@ve, or electronic certificate. Users can access services such as tax returns, appointment scheduling, payment and deferral of debts, notifications and document verification, virtual assistance tools, video calls, census data and fiscal address, subscription to informative alerts, subscriptions, and a search engine for auctioned goods, as well as document signing and consultation. The app provides access to information and the option to receive notifications about news and personal updates. Users are required to provide personal data to log in, identify their device, and allow the Tax Agency to provide personalized services within its competencies. The Tax Agency informs users that this information will be available to the mobile application. The data will be used exclusively for the fulfillment of tax rights and obligations and will not be shared with third parties, except in cases that comply with Article . of the General Tax Law. The app also includes a legally valid privacy notice and ensures the appropriate protection of personal data. Some of this information is stored or sent to the Tax Agency's servers, which are owned by the agency. The Tax Agency guarantees that personal information will be stored and used securely for the necessary time and solely to provide the aforementioned personalized services. The privacy policy, terms of service, and accessibility statement can also be consulted within the app.