When do debts with the Tax Agency and Social Security become time-barred?

Four years, as a general rule. The limitation period for both tax debts and Social Security debts is four years, but these are precisely the debts that, in practice, most often fail to become time-barred, because a single collection action by the authorities, properly notified, is enough to interrupt it and restart it from zero. We set out when that period starts running, what interrupts it, and how it relates to the debt discharge available under Spain's second-chance law.

Limitation (prescripción) is the extinction of a right through the mere passage of time without its holder exercising it. Against the Tax Agency and Social Security it operates on two distinct levels: the authorities' right to assess the debt, and, once it has been assessed, their right to demand payment. These are independent periods, and they should not be confused with the discharge of unsatisfied liabilities under the second-chance law, which is a different, judicial mechanism, as explained below.

When does the period start running against the Tax Agency?

The period is four years from two different points in time, depending on which right is at stake. Article 66 of the General Taxation Act sets at four years both the authorities' right to determine the debt through an assessment and, once it has been assessed or self-assessed, the right to demand its payment. Under article 67, the first period runs from the day after the deadline for filing the tax return or self-assessment; the second, from the day after the end of the voluntary payment period.

These are, therefore, two clocks that do not necessarily start together. A debt may have been assessed long ago, and the period that matters then is the one for collection, not for assessment.

And when does a Social Security debt become time-barred?

Also after four years. Article 24 of the consolidated Social Security Act sets that same four-year period both for the General Treasury of Social Security to determine the debt for contributions through an assessment and to demand its payment once assessed. Like the tax rule, it distinguishes between the right to assess and the action to collect, and it leaves the period for Social Security debts that are not contributions, such as certain surcharges or wrongly paid benefits, to the specific rules.

What interrupts the limitation period, and why do so few of these debts actually become time-barred?

Any collection action by the authorities, formally notified to the debtor, interrupts the period and restarts it in full from the following day. Article 68 of the General Taxation Act lists, among other grounds for interruption, any action by the authorities effectively directed at collection, the lodging of appeals or claims, and even the debtor's own declaration of insolvency. Article 24.3 of the consolidated Social Security Act sets out an equivalent rule for contributions: the period is interrupted by any administrative action of which the party liable has formal knowledge, most notably a demand for the debt or an assessment record.

A notified demand for payment, a seizure that has been carried out, or even an appeal that the debtor files against the assessment all interrupt the clock. In practice, that breadth explains why active debts with the Tax Agency or Social Security rarely become time-barred: the authorities have notification and enforcement mechanisms that, used in the ordinary course, renew the period again and again.

Limitation protects against prolonged inactivity by the authorities, not against a collection procedure that is moving forward. It should never be treated as a way of stalling payment or of concealing the origin of income or assets: doing so also compromises the good faith that the second-chance law itself requires in order to discharge debts, as explained in our guide on Spain's second-chance law.

Is it the same thing for a debt to become time-barred and for the second chance to cancel it?

No, these are two different, non-exclusive mechanisms. Limitation extinguishes the authorities' right through the passage of time without action; the discharge of unsatisfied liabilities is a judicial mechanism, governed by articles 486 and following of the consolidated Insolvency Act, which a Commercial Court grants to an individual debtor acting in good faith within insolvency proceedings, regardless of whether their debts have become time-barred.

They are, moreover, compatible with each other. A debt with the Tax Agency that has not become time-barred — the most common situation, for the reasons already explained — can nonetheless be discharged within the terms and quantitative limits of article 489.1.5º of the same consolidated act, under the doctrine set by the Supreme Court on 18 February 2026, which we analyse in detail in our piece on second-chance proceedings and public debt.

If what you are dealing with is a seizure already in place over your bank account or your salary, we explain the limits that protect your income in our guide on Tax Agency seizures; and if you personally guaranteed a company loan, we cover your situation in a separate piece.

How we help with time-barred debts to the Tax Agency and Social Security at RCM Legal

Some debtors believe, in good faith, that an old debt has become time-barred, when in reality a demand, an appeal of their own, or even an earlier declaration of insolvency interrupted the period without anyone noticing; others, once the enforcement file is reviewed thoroughly, turn out to be right that the authorities did let four years pass without taking action. Telling the two situations apart means reviewing the notifications, dates and steps taken in each procedure, not simply counting years from the origin of the debt.

At RCM Legal, our civil-law lawyers in Murcia review the enforcement and collection file against the Tax Agency and the General Treasury of Social Security to check whether a debt has become time-barred, and, where it has not, assess with you whether to apply for the discharge of unsatisfied liabilities before the Commercial Court of Murcia. Tell us about your case and we will review the real status of each debt with you.