Nuria Salvat lives in Girona and since 2021 has let a flat in Figueres to a family. On Tuesday 3 November 2026 she receives a formal request from the Agencia Tributaria, the Spanish tax agency, within a limited verification procedure on her 2024 income tax: she is asked to justify the expenses she deducted from the rent, in particular 3,900 € of mortgage interest, 2,150 € for a boiler repair and the service charges of the owners' association. She has the boiler invoice and the service-charge receipts, but the interest certificate has to be issued by her bank, which tells her it will take three weeks. The request gives her ten days. Nuria does not know whether she can ask for more time, or whom to ask.
The rule is in a single article of the Regulations
Extensions of deadlines in tax procedures are governed by article 91 of the Regulations on tax management and inspection (Royal Decree 1065/2007). Its essential content fits into four sentences:
- The office handling the case may grant, at the taxpayer's request, an extension "not exceeding half" of the period.
- Only one extension of each period is granted.
- It must be requested "before the three days preceding the end of the period", the circumstances that make it advisable must be justified, and the rights of third parties must not be harmed.
- It is treated as granted automatically for half the period once the request is filed in time, unless you are notified of a refusal before the period you want extended comes to an end.
The fourth point is what makes it worth asking almost every time: silence works in your favour. If the authorities do not answer in time, you have the extension.
Nuria's calendar, day by day
The period is ten working days counted from the day after notification. With no local holidays in between, the dates would be these:
| Milestone | Date |
|---|---|
| Notification | Tuesday 3 November |
| First day of the period | Wednesday 4 |
| Last day to request the extension with a safe margin | Wednesday 11 |
| Three working days before expiry | Thursday 12, Friday 13 and Monday 16 |
| End of the original period | Tuesday 17 |
| Extension of half | Five more working days |
| End of the extended period | Tuesday 24 November |
Step by step:
- Ten working days from Wednesday 4, skipping two weekends, end on Tuesday 17.
- The three days before that date are the 12th, the 13th and the 16th (the weekend does not count).
- The request has to be filed before them. Wednesday 11 is the latest date that leaves no doubt. Some people read the count differently; when in doubt, the sooner the better.
- Half of ten working days is five. Counted from the day after the end of the original period: the 18th, 19th, 20th, 23rd and 24th.
- The new deadline is Tuesday 24 November.
Nuria still does not reach the three weeks the bank needs, but she gains a week. And she can use it well.
A request filed within the three days before expiry does not meet the requirement in article 91.3.a). It is not granted automatically, and it will most likely be refused or not even processed. If the deadline slips away, what is left is to provide what you have and explain the rest, not to ask for more time.
What to write in the request
The rule requires you to justify the circumstances that make the extension advisable. A long document is not needed, but a specific one is:
- Identify the procedure: case number, office and date of notification.
- Expressly request the extension under article 91 of the Regulations for half the period.
- Explain the reason with verifiable facts. In Nuria's case: that the interest certificate is issued by the bank, that she requested it on a specific date and that the bank has told her how long it will take. Attaching the request to the bank strengthens the application.
- State which documents you already have and that you will provide them within the period.
It is filed through the electronic registry of the online portal, within the same case file. If you have no digital certificate or would rather someone else dealt with it, you can send the request through the letter-from-Hacienda form and the application is prepared in your name with the appropriate authorisation to represent you.
What the extension does not do
It has limits that are worth knowing before you rely on it:
- The refusal cannot be appealed. Article 91.6 says so expressly: neither the grant nor the refusal can be the subject of an appeal or an economic-administrative claim. If it is refused, all that remains is to comply within the original period.
- It is not repeated. Once the extension has been used up and something is still missing, a second extension of the same period is not possible.
- You cannot ask for more than half. The authorities may grant less, notifying you before the original period ends (article 91.4, second paragraph), but not more.
- It lengthens the procedure. Article 104.c) of the Regulations treats an extension granted as a delay not attributable to the authorities. The days gained do not count towards the six-month maximum length of the limited verification procedure. If you were planning to argue that the procedure had lapsed, each extension moves that further away.
This last point is the only real cost of asking for the extension. In most cases it is worth it: six months is a long time, and a lapse rarely depends on one week. But in a procedure that has already been open for months, it is worth doing the sums first. How lapsing works is explained in what a limited verification procedure is.
Postponing an appointment is something else
Sometimes the request does not ask for documents but summons you to an office on a particular day and at a particular time. For that, paragraph 5 of the same article provides for a postponement, not an extension: it is requested within the three days following notification of the request, justifying the circumstance that prevents you from attending. If that circumstance arises later, it can be requested before the date set. The authorities then set a new date.
When even the extension is not enough
If, when the extended period ends, you still do not have the document, the sensible course is to reply anyway:
- Provide everything you have: in Nuria's case, the boiler invoice, the service-charge receipts and the mortgage repayment schedule available in her online banking.
- Explain what is missing and why, with proof that you have requested it.
- State that you will provide it as soon as you receive it.
Article 104.a) of the Regulations counts as a delay attributable to the taxpayer the time that passes until the request has been "fully" complied with, so that wait does not run against the authorities in the maximum length of the procedure. But a partial, explained reply is very different from silence; the consequences are compared in what happens if I do not reply. And if you do not know which documents can really be demanded, before asking for time to gather them it is worth reading which documents I have to provide.
Counting working days and the date of notification, which underlies everything above, is covered in how many days you really have to reply and in the guide on counting deadlines and electronic notification.
Managing deadlines, extensions and replies in Agencia Tributaria procedures is described on the Salama Tax page on letters from Hacienda.