Not always have enough savings to meet the payment of taxes. In this case, unless we have negotiated with the tax deferral of payment of the same, we have contracted a debt to Treasury debt that will, in principle, a limitation period of four years, common to all tax debts.
And we say in principle because this limitation period, which shall be counted from the day following the deadline for ending the tax payment, but stops at the right time the tax take any action to obtain payment of the same, whether civil or criminal, filing appeals, etc..
Also be interrupted if we make any payment or action leading to the extinction of the debt. Keep in mind that every time there is some action that stops it starts again calculating the period.
This period of four years is generic to all debts except for the customs tax, which is three. Another exception to this deadline is undeclared income, which, according to the Council of Ministers approved on Friday, will not prescribe ever.
For this period of four years and we are required to retain during the term proof of payment of each tax, since the tax has the time to make a parallel statement in order to detect any irregularities in which we been incurred in the payment of the tax.
Once you have passed the statute of limitations, tax debt is extinguished, ie stop being debtors with the Treasury and we can re-claim.