2025 Income Tax Return: Dates, How to File, and What You Need
With the arrival of April, one of the most important times of the year begins from a tax perspective: the 2025 income tax return campaign. Every year, thousands of taxpayers make mistakes that can lead to penalties, surcharges, or financial losses due to incorrectly applying deductions.
In this article, we clearly explain when the 2025 income tax return is filed, how you can file it, and what documentation you need, so that you can avoid issues with the Tax Agency.
When to File the 2025 Income Tax Return?
The deadline to file the income tax return begins on April 8 and ends on June 30.
It is important to note that this return pertains to income and tax data for the year 2025.
If you do not file the return on time, the Tax Agency may apply:
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- surcharges
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- late payment interest
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- financial penalties
In addition, if the result is payable, the deadline to set up direct debit for the payment ends on June 25.
How to File Your 2025 Income Tax Return: Online, Phone, or In Person
There are several ways to file the return:
Online
Available from April 8 to June 30. This is the fastest and most frequently used option.
By phone
Available from May 6 to June 30. Advance appointment booking is required from April 29.
In Person
From June 1 to June 30, also by appointment (from May 29).
Choosing one option or another will depend on the complexity of your tax situation. In many cases, having professional advice can prevent significant errors.
Review Your Tax Data Before Filing Your Return
Before confirming the draft return, it is essential to review the tax data held by the Tax Agency. This data is not always complete and may contain errors.
It is common for the following to be missing:
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- additional income
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- aid or subsidies
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- regional deductions
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- cryptocurrency transactions or investments
The final responsibility always lies with the taxpayer, not the Tax Agency.
What Documents Do You Need to File Your 2025 Income Tax Return?
Although the Tax Agency already has a lot of information, it is advisable to have the following at hand:
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- ID (DNI) and personal data
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- bank account number (IBAN)
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- company income certificate
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- property information (IBI, cadastral references, rentals)
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- proof of purchase or sale of shares, cryptocurrencies, or properties
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- investment fund certificates
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- proof of aid or subsidies
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- receipts or documents that allow for deductions
Having all this documentation organized can make the difference between overpaying or correctly optimizing your return.
Common Errors in Income Tax Returns
Every year we see the same errors:
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- not reviewing the draft
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- not declaring secondary income
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- forgetting deductions
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- not updating personal or family situation
A small error can lead to a review by the Tax Agency.
Do You Need Help with Your 2025 Income Tax Return?
At Martínez & Caballero Abogados we help individuals, self-employed professionals, and businesses file their income tax return correctly, avoiding mistakes and optimising the outcome.
If you want to ensure your return is correctly prepared or need advice, you can contact our team, and we will study your case individually.
