A flaw in the 2025 Income Tax Return prevents the application of key regional tax benefits

The 2025 Income Tax Campaign has started with an unexpected incident that directly affects the application of certain regional tax deductions across several autonomous communities.

The beginning of the campaign has revealed an operational issue in the Renta Web system that is temporarily preventing the application of some of these deductions, particularly in the Valencian Community and Castilla-La Mancha. This may affect thousands of taxpayers who have chosen to file their tax returns in the first days of the campaign.

A technical issue affecting newly approved regional tax deductions

According to available information, the origin of the incident lies in the failure to incorporate, in time, certain regulatory changes approved by some autonomous communities into the Renta Web system.

In the case of the Valencian Community, the issue affects deductions related to healthcare expenses, sports activities, and music-related activities, as well as the extension of income thresholds required to access these tax benefits. In Castilla-La Mancha, the situation extends to the introduction of new deductions and the modification of existing ones.

The Spanish Tax Agency (AEAT) is working on updating the system to enable these deductions as soon as possible. However, in the meantime, taxpayers may encounter disabled fields or even missing entries in their draft tax return.

What is the taxpayer seeing in their tax return?

Affected taxpayers may encounter different scenarios within Renta Web.

In some cases, the system displays messages indicating that a field is temporarily disabled due to pending regulatory updates. In the case of newly created deductions, the relevant fields may not appear at all, which could mistakenly lead taxpayers to believe they are not entitled to claim them.

This may result in many taxpayers submitting their tax return without applying deductions they are actually eligible for, especially if they do not later review system updates or are not familiar with regional tax developments in their area.

 

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What should you do if you are affected?

In this situation, the most prudent approach is to avoid rushing to file your tax return if you believe you may be entitled to any of the affected deductions. Once the Spanish Tax Agency updates the system and activates the corresponding fields, these deductions can be included as normal.

If the tax return has already been filed, it is possible to request an amendment to include the omitted deductions, always within the legal deadlines. In such cases, it will be important to have supporting documentation proving eligibility for the deduction.

It is also advisable to regularly check updates from the Spanish Tax Agency during the first days of the campaign, as these issues are typically resolved progressively.

Our recommendation

In this context, it is especially advisable to carry out a thorough review of your tax return before filing, paying close attention to the regional deductions applicable based on your autonomous community of residence, and ensuring that the system has incorporated all regulatory updates for the tax year.

Need help with your tax return?

These types of issues with regional deductions show how easy it is to miss tax savings opportunities if the return is not carefully reviewed.

At Adlanter, we help you optimise your tax position with a specialist and personalised approach, covering complex tax returns, expatriates and high-net-worth individuals, as well as comprehensive tax management including VAT, Corporate Income Tax, and personal income tax filings.

Contact our tax team and ensure your return is filed with full compliance and maximum accuracy.