2025–2026 Income Tax Campaign: key dates, who must file, and what you need to keep in mind
In this article, we go over the key dates, filing methods, who is required to file, and other aspects you should keep in mind from now on.
19/03/2026
📝- Index
The Tax Agency has already confirmed the official schedule for the 2025-2026 Income Tax Campaign, one of the most important fiscal events of the year for millions of taxpayers in Spain.
Although there are still months until it starts, knowing the dates, deadlines, and main obligations in advance allows for better planning of the declaration, avoiding mistakes, and anticipating potential issues, especially in more complex work or asset situations.
Official Dates for the 2025-2026 Income Tax Campaign
The campaign will start on April 8, 2026 and end on June 30, 2026, according to the schedule published by the Tax Agency. These are the main dates to keep in mind:
| April |
|
| April 8 | Start of the campaign for online declarations |
| April 29 ¹ | Start of the period to request an appointment for telephone assistance |
| May |
|
| May 6 | Start of the telephone assistance service |
| May 29 ² | Start of the period to request an appointment for in-person declarations |
| June |
|
| June 1 | Opening of in-person appointment bookings |
| June 25 | Last day to set up direct debit if the declaration results in payment |
| June 29 ¹ | End of the period to request an appointment for telephone assistance |
| June 29 ² | End of the period to request an appointment for in-person declarations |
| June 30 | Last day to submit the declaration |
The indicators ¹ and ² show which dates are related and indicate a time period
Ways to Submit Your Declaration
As in previous campaigns, taxpayers can choose among several options:
- Internet or App Declaration. From the first day of the campaign, the Renta Web draft will be available, which should be carefully reviewed before confirming.
- Telephone Declaration. The Tax Agency prepares the declaration through the “We Call You” plan, with a prior appointment.
- In-Person Declaration. Assistance at offices for those who prefer direct support, also requiring a prior appointment.
What About Pending Refunds from Previous Campaigns?
According to the latest available data, the Tax Agency has already processed most refunds from the previous campaign, although a small percentage is still pending.
It is worth remembering that:
- The legal maximum period to issue a refund is six months from the end of the campaign.
- If the refund is delayed beyond this period, the Tax Agency must pay late interest to the taxpayer.
Updates for the 2025-2026 Income Tax Campaign
One of the updates for the 2025-2026 Income Tax Campaign is the use of Artificial Intelligence (AI) by the Tax Agency to assist and supervise taxpayers while preparing their declaration. According to the Tax Computing Department, these systems detect errors or omissions that may occur during the completion of the Income Tax, including those that could be considered “intentional”.
When a citizen modifies certain boxes in Renta Web, AI may generate alerts to confirm that the entered data is correct. In many cases, taxpayers correct the information after receiving the alert, which helps reduce errors before submitting the declaration.
AI is also used preventively to identify individuals who may be required to file and have not yet done so. If this situation is detected, the Tax Agency sends a notice to prevent unintentional non-compliance.
It is important to highlight that, although AI supports error detection and prevention, all final decisions are supervised by humans, ensuring that no automatic measures are taken based solely on intelligent systems. This approach aims to combine efficiency, taxpayer assistance, and legal security, always maintaining human oversight over the Tax Administration’s actions.
If you reside or pay taxes in Bizkaia, remember that local criteria and a different fiscal calendar apply. You can consult the specific updates for the Income Tax in Bizkaia for this fiscal year.
Do You Need Support for Your Income Tax Declaration?
Although the campaign won’t start until April, this is a good time to consult a tax and accounting advisory and:
Do you have any questions?
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