In 2026, Spanish taxpayers will face updated rules for accessing their fiscal data. New deadlines and verification methods introduced by Agencia Tributaria will directly impact income tax return preparations. For many residents, this means the need to review the details in advance to avoid mistakes and possible penalties.
Starting March 18, access to personal tax data for 2025 will become available. This allows taxpayers to check the information that will be used to prepare the draft return ahead of time. According to RUSSPAIN.COM, timely review of these details helps avoid unpleasant surprises when submitting documents and speeds up the process of receiving refunds or paying outstanding amounts.
Access to information
You can access your tax data through the Agencia Tributaria online platform or via the mobile app for Android and iOS. A valid identification method is required to log in. Available options include the Cl@ve system, FNMT digital certificate, DNI electrónico, and a unique six-digit code that can be requested on the tax agency’s website.
The Cl@ve system is used to verify identity for all government services. Registration is possible online, by invitation, via video call, or in the mobile app. The FNMT electronic certificate is installed in the browser and works on a computer, smartphone, or tablet. To use the DNI electrónico, you need a device with NFC support and know your PIN code. If none of these options are available, you can obtain a login number by providing your passport details and an amount from a specific line on last year’s tax return.
What information is available
After logging into the “Datos fiscales” section, users see information about themselves and their address, including name, NIF or NIE, as well as place of residence and cadastral number. This then opens access to the financial data for 2025: income from employment, business activities, bank interest, loan payments, property and rental details, and information about social contributions and credits.
Depending on the taxpayer’s profile and the information provided to the Agencia Tributaria, the set of available data may vary. It’s important to remember that the tax agency receives information not only from banks and employers, but also from online platforms such as Wallapop or Airbnb, if transactions exceed €2,000 or there are more than 30 deals per year.
Verification and adjustment
Before confirming the draft declaration, taxpayers must carefully review all information. If any inaccuracies or outdated data are found, they must be corrected before submitting the documents. The individual is fully responsible for any errors, even if caused by third parties or automated systems. Failure to comply may result in fines and additional checks.
Special attention should be paid to new sources of income that may have arisen during the year, as well as real estate transactions and rentals. If the declaration was not filed last year or the relevant line showed zero, you will need to provide the last five digits of the IBAN of a bank account registered in 2025 to obtain an access number.
Context and recent updates
In recent years, Spain has tightened oversight of electronic services and platforms that share citizens’ income data. In 2024, similar rules already affected users of digital wallets and short-term rental services. At that time, many had to urgently update their information and confirm transactions to avoid tax refund blocks. According to russpain.com, these measures helped reduce errors in declarations and speed up the processing of applications. In 2026, the trend toward digitalization and automation of tax procedures continues, while demands for accuracy and timely information submission are rising.
