A legal provision allows Spanish taxpayers to voluntarily settle tax debts without facing penalties, provided they do so before receiving official notification through the “Buzón Tributario” (Tax Office Inbox) system. This rule, largely unknown to citizens, offers a window to regularize fiscal obligations proactively. However, taxpayers remain responsible for paying legally mandated surcharges and updates on the outstanding amount. The procedure for calculating and submitting these additional payments remains standard. Authorities encourage citizens to utilize this opportunity to avoid potential fines. The initiative aims to promote voluntary compliance and streamline the tax regularization process. This provision applies to various tax obligations and offers a significant benefit for those unaware of the existing notification system.