What happens if the inheritance tax return is filed late?
If the heirs file the return late of their own accord, they pay a surcharge of 1 % to 15 % and, after a year, interest as well. If the “Agència Tributària de Catalunya”, the Catalan tax authority, demands it first, there is no surcharge, but there is interest and there may be a penalty starting at half the amount left unpaid. If nobody does anything, the tax becomes statute-barred four years after the filing period ends, although every notice from the tax authority resets the clock.
Alburquerque Abogados
José Manuel AlburquerqueIf you file late on your own initiative
- The surcharge is 1 % plus a further 1 % for each full month of delay.
- After twelve months, the surcharge is 15 % and interest is also payable from then on.
- The surcharge is reduced by 25 % if it is paid on filing, together with the tax, or within the period the tax authority allows when it gives notice of it.
The six-month period does not stop running while a handwritten will is being taken to a notary, if nobody objects, as the “Tribunal Supremo”, Spain's Supreme Court, confirmed in January 2026. It only stops if court proceedings over the estate are brought before the period ends. When the proceedings end, the six months start afresh.
If the tax authority demands it
- There is no surcharge, but there is interest from the end of the period.
- In addition, there may be a penalty starting at half the amount left unpaid. If that amount is more than 3.000 euros, the penalty is usually 75 %. If it is accepted and paid on time without an appeal, it is reduced by more than half.
When it becomes statute-barred
- The limitation period is four years. It starts to run when the six months for filing end, or the twelve months if an extension was applied for in the first five months.
- Any action by the tax authority that is notified to the heirs, or any written submission by them concerning the tax, resets the clock.
Even if the tax is statute-barred, the return still has to be filed in order to register the properties. Until it is filed, the “Registro de la Propiedad”, the Land Registry, will not register them in the heirs' names and the bank will not release the money to them, although it can use it to pay the tax.
This answer is provided for educational purposes and offers initial guidance on the question raised. Every matter has its own circumstances and nuances that require individual assessment. For that reason, before taking decisions with significant consequences, it is advisable to consult a professional and not to rely solely on this information. Personalised advice makes it possible to apply these explanations to the specific case and to assess the options available with greater certainty.