Prescripción, the Spanish limitation period, is the only structural piece of good news in the tax system: after a certain time, Hacienda (the tax authorities) can no longer claim. But the period does not start when people think it does, it restarts more easily than it seems, and some items survive well beyond the four years. This guide explains when the count starts, what interrupts it and where the rule does not work in the usual way.
Four rights, four clocks
| Right that becomes time-barred | Whose right | Period |
|---|---|---|
| Determining the debt by an assessment | The tax authorities' | 4 years |
| Demanding payment of debts assessed or self-assessed | The tax authorities' | 4 years |
| Claiming refunds and reimbursement of the cost of guarantees | The taxpayer's | 4 years |
| Obtaining refunds already acknowledged | The taxpayer's | 4 years |
They are independent of one another: the fact that the right to assess has lapsed does not mean the right to collect a debt already assessed has lapsed, and vice versa. In a file with several fronts, each clock has to be looked at separately.
When the count starts
The period for the right to assess starts on the day after the statutory deadline for filing the return or self-assessment ended. It is not counted from when the income was earned, nor from when the return was filed, nor from 31 December of the tax year.
| Obligation | End of the filing period | Clock starts | Four years complete |
|---|---|---|---|
| IRPF (income tax) for year X | 30 June of X+1 | 1 July of X+1 | 30 June of X+5 |
| VAT for the fourth quarter of X | 30 January of X+1 | 31 January of X+1 | 30 January of X+5 |
| Modelo 720 for year X | 31 March of X+1 | 1 April of X+1 | 31 March of X+5 |
| Inheritance tax (death on date D) | Six months from D | The following day | Four years later |
When an extension has been requested for inheritance tax (the Impuesto sobre Sucesiones), the filing period becomes longer and the limitation clock starts later. It is another little-known effect of the extension: it also pushes back the day on which the inheritance is closed for good.
What restarts the clock
Interruption does not pause the clock: it wipes out the time already run, and the period starts again from zero. The limitation period for the right to assess is interrupted by:
- Any action by the tax authorities, carried out with the taxpayer's formal knowledge, aimed at the acknowledgment, regularisation, review, inspection, securing and assessment of all or part of the elements of the obligation.
- The lodging of claims or appeals of any kind, and steps taken in proceedings of another nature, including criminal ones.
- Any verifiable act by the taxpayer himself or herself aimed at assessing or self-assessing the debt.
The third case is the one that catches the most people acting in good faith. Filing a late self-assessment, or a supplementary one, for a year that is already time-barred is a verifiable act aimed at assessment: it interrupts the limitation period for that obligation and opens another four years for the tax authorities to review it. That is why the first step in any regularisation is to mark in the inventory which years are dead and leave them alone. The complete script is in in what order to regularise several years.
It also works the other way round: an appeal lodged by the taxpayer interrupts the limitation period in favour of the tax authorities. Appealing a 2021 assessment in 2026 keeps that file alive throughout the proceedings and for four more years after they end. It is not a reason not to appeal, but it is a fact that has to go on the scales described in surcharge, interest and penalty.
What does not die after four years
There are three areas where the general rule is not enough.
- The right to review and investigate. The Ley General Tributaria, Spain's General Tax Act, distinguishes between assessing and reviewing: the tax authorities can review facts and items from time-barred years when they have effects in years that are still open. For negative bases or tax amounts offset or waiting to be offset, and for deductions applied or pending, that right to start a review has its own period of ten years.
- The duty to keep and produce records. Once that period has passed, the taxpayer must still be able to prove the origin and amount of those bases and deductions by producing the assessment or self-assessment and the accounts. Keeping the purchase deeds of a property not yet sold has, in practice, no expiry date.
- Connected obligations. When the tax authorities correct one obligation and that correction affects a different obligation of the same taxpayer, the interruption of the limitation period for one reaches the other. That is what makes it possible, for example, to correct the year in which an expense was deducted when the year in which the income was recognised is being corrected.
Offences, penalties and the criminal side
The right to impose penalties has its own four-year period, counted from the moment the offence was committed, and the right to demand payment of penalties already imposed has another. Neither should be confused with the right to assess, even though they almost always run together.
The criminal side runs on its own and for longer. The offence of tax fraud becomes time-barred under the rules of the Criminal Code, with a period longer than the tax one and longer still for the aggravated form, so a year that is time-barred for administrative purposes may not be so for criminal purposes. When the amount at stake approaches the threshold for the offence, the tax limitation period stops being the reference point and the conversation moves to different ground: it is explained in the guide to the order of regularisation. We do not make that calculation from memory, nor do we predict how it will end.
Refunds are time-barred too, and against you
The four-year period does not only protect the taxpayer. The right to request refunds arising under the rules of each tax, refunds of tax unduly paid and reimbursement of the cost of guarantees also lapses after four years, counted, depending on the case, from the day after the period for requesting the refund ended, from the day after the undue payment, or from the date the decision recognising it becomes final. Anyone who had too much withheld, paid a form twice or suffered an improper withholding has that period and not a day more.
This matters especially in two scenarios. One is that of non-residents who suffered withholding above what a tax treaty allowed and want to recover it with a Modelo 210 refund claim, where each year has its own clock. The other is that of someone who paid an assessment later found to be unlawful by a court judgment: the judgment becoming final opens the period, but it does not open it indefinitely. Reviewing the recoverable years before they close is a January task, not a June one.
It is applied automatically, and it is still worth pleading
A limitation period that has run benefits all those liable to pay equally, and it is applied by the tax authorities of their own motion, even if the debt has been paid. In practice that means two things. First, if you are notified of an assessment for a time-barred year, you can object and the tax authorities must cancel it. Second, if you paid something already time-barred, you can ask for a refund of tax unduly paid within the relevant period. Pleading it in writing, with the dates worked out, is what avoids arguments about whether there was an interrupting action that nobody remembered.
The interruption nobody remembers
The weak point of almost every home-made calculation is the same: old actions that restarted the period get forgotten. An attachment order, a request for information answered years ago, an application for deferral, an appeal that was lodged and then left to die, even a notice opening a procedure that ended because it lapsed. Not all of them have the same effect (when a procedure lapses, for instance, there are specific rules on whether the steps taken in it interrupted the period or not), and that is why the calculation is never done from memory.
The serious way to do it is to download the taxpayer's own history of notifications and files from the tax office's electronic portal (the sede electrónica), sort it by date and tax, and calculate from the last valid action. If something turns up that nobody remembered, it is better to discover it now than after filing a self-assessment for a year you thought was closed.
How it is worked out in practice
- Identify the exact obligation: tax and period.
- Find the last day of the statutory filing period and add one day: that is where it starts.
- Count four years from date to date.
- Check whether there were, in between, notifications, requests, appeals, inspection reports or later self-assessments. Each one restarts the clock from its own date.
- Check whether the item has effects in years that are still open: if it does, it can be reviewed even though its own year is closed.
That calculation has to be written down and kept with the proofs of notification, because the argument, if it comes, will be about dates. If you have old years and want to know which are really closed before moving anything, write to us through the late filing form. We work out the limitation period obligation by obligation and tell you what is worth filing and what is best left alone, warning you of the risks of each decision. What we do not do is guarantee that the tax authorities will share our calculation: that is something we defend, not something we promise.