Request for cancellation of the declaration submitted by someone not required to declare
If you were not required to file a 2025 Income Tax return, but you have filed it, you can request that it be considered as not filed.
To do this, you must submit a corrective self-assessment indicating this circumstance and this situation will be reflected in box 125 of the declaration form.
In the following example, a return with a refund of €142.14 has been filed and has already been agreed.
To cancel a previously submitted return, the procedure is as follows: access the "Return Sections" option from "Return Sections" to "Modify 2025 Income Tax Return already submitted":

And in the window, check box 103:

And the option will appear to mark that the declaration is considered not submitted:

Clicking on this last box opens the following window:

The options are:
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Check the first box to indicate that you are not required to submit and that you request that the declaration be considered as not submitted.
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Mark both in cases where you do not have the status of an IRPF taxpayer and, by mistake, the declaration has been submitted (taxpayers residing in the territory of Navarre or non-residents).
In this case, the first option will be selected:

Confirmation will be requested:

And then, the new result will be visible in the statement summary:

Since the refund has been agreed upon, in this case, the €142.14 that they previously received will have to be paid in.
The submission of the corrected self-assessment will mean that the original declaration is considered not submitted since there is no obligation to declare, and, if there have been no economic effects yet, the payment or refund will be stopped.
The receipt for the submission of the amended self-assessment will show box 125 marked:
