The Six-Month Deadline for Spanish Inheritance Tax: What Foreign Heirs Must Know
Spain imposes one of the strictest filing deadlines in Europe for inheritance tax. Heirs of a deceased who held assets in Spain — wherever the heirs themselves live — must file and pay the Impuesto de Sucesiones y Donaciones within six months of the date of death. The clock does not stop because the heirs are still abroad, because a UK or US probate is pending, or because the family is still locating documents. Once the six months pass, surcharges of 5%, 10%, 15% and 20% kick in automatically, plus statutory interest. For an estate of any size, the cost of missing the deadline by even one day can run into thousands of euros, and the surcharges keep climbing for two full years. This article explains exactly how the six-month period is counted, when it can be extended (and when it cannot), how to file from abroad without travelling to Spain, and how a dedicated inheritance lawyer in Spain can keep the file on track even when probate in the heir’s home country is far from complete. We also cover the practical mechanics of paying inheritance tax from a foreign bank account and the regional reductions that often eliminate the tax altogether.
Where the six-month rule comes from
The six-month deadline is set by article 67 of the regulations to the Spanish Inheritance and Gift Tax Act (Real Decreto 1629/1991) and by the Tax Procedure Act (Ley General Tributaria). Both texts are mandatory and apply identically to residents and non-residents. The deadline runs from the date of death, not from the date the heirs are notified, not from the date probate is granted in another jurisdiction, and not from the date the heirs decide to accept the inheritance. The Spanish tax authority (Agencia Estatal de Administración Tributaria) and the regional tax offices treat the six months as a strict procedural deadline.
The rule has a practical purpose: Spain wants the estate to be settled, taxes paid, and assets reattributed to their new owners within a defined window. For a Spanish family this is usually manageable. For a British, American or Dutch family operating across borders, it is a constant pressure. The strategies for dealing with the six-month deadline are different in every country and we cover the country-specific points in our blog series, including the dedicated guide on the six-month deadline for Spanish inheritance tax.
How the deadline is counted in practice
The six months are calendar months, not working days. A death on 14 March creates a deadline on 14 September. If the 14th is a Sunday or a public holiday, the deadline is the next working day, but you should never rely on this — local holidays in the relevant region (for example, Andalusia’s local feast days) may not be the holidays the heir expected. When the deceased held assets in several Spanish regions, the deadline is still six months from the date of death; the file is presented in the region of the deceased’s last habitual residence or, for non-residents, in Madrid before the central tax office.
There is no soft landing. The tax office does not contact the heirs to remind them. There is no automatic extension because the heirs are abroad, because a will is still being located, or because the family is still arguing about how to divide the estate. The only formal way to gain more time is the six-month extension explained below.
The six-month extension — and why it is often missed
The Spanish IHT regulations allow the heirs to request a single extension of six months, doubling the filing window to twelve. The application must be filed within the first five months from the date of death (not the first six), it must be made by all the heirs jointly, and it must be reasoned. The reasons accepted in practice are limited — typically the complexity of an international estate, the time required to obtain apostilles and sworn translations, and the existence of foreign probate proceedings. Granting the extension is not automatic but is routine in international cases when the application is properly drafted. A practical step-by-step on how to apply is included in our guide to accepting a Spanish inheritance from abroad.
Crucially, requesting the extension does not stop the running of interest. If the heirs end up paying tax after the original six-month deadline but within the extended twelve-month period, no 5% surcharge applies, but late-payment interest is charged from month seven. The arithmetic still strongly favours requesting the extension over paying late without it, because the surcharge regime is far harsher than the interest regime.
The surcharge ladder when the deadline is missed
Article 27 of the Spanish General Tax Act sets out the surcharge ladder for late voluntary filings. If the heirs file and pay between months six and twelve, the surcharge is 1% per month of delay (so 1% to 6%, capped at 12 months). If the heirs file and pay between months twelve and twenty-four, the surcharge is 15% plus statutory interest from month twelve. If the heirs file after twenty-four months, the surcharge is 20% plus interest from month twelve onward. These percentages apply on top of the inheritance tax itself.
If the tax authority issues a notification before the heirs file voluntarily, the picture is much worse. The surcharge becomes a sanction (between 50% and 150% of the tax owed), again with interest, and the file falls into a formal tax-inspection procedure that the heirs can no longer control. The lesson is clear: the worst possible strategy is to wait passively in the hope that the tax authority will not notice. Spain’s land-registry and bank-reporting systems mean that an unfiled inheritance is detected, sooner or later, with mathematical certainty.
Filing from abroad without travelling to Spain
Filing the inheritance tax return from abroad is straightforward when a lawyer in Spain holds the heirs’ power of attorney. The lawyer prepares Model 650 (the inheritance and gift tax form), uploads the supporting documents to the regional electronic office, calculates the tax due, and pays it from a Spanish bank account opened in the heirs’ name or, in some regions, by international bank transfer. The notarial deed of acceptance is signed in parallel — by the heirs in person or by the lawyer under the power. The mechanics of payment without a Spanish bank account vary by region, but no region requires the heir to be physically present, and all major regions allow electronic filing through a lawyer. The full process for non-residents is set out in our overview of the inheritance services we provide remotely.
The NIE number (Número de Identificación de Extranjero) is required for every non-resident heir, because the tax form cannot be filed without it. The NIE can be obtained from a Spanish consulate abroad or through a power of attorney from a lawyer in Spain. Many British families discover only after the death that the deceased never obtained a NIE for an inherited heir who was added to a Spanish bank account or registered as co-owner of property; the absence of a NIE is one of the most common causes of delay.
Regional reductions that can reduce or eliminate the tax
Spanish inheritance tax is a state tax that has been substantially devolved to the autonomous regions. The regional reductions are dramatic and have transformed the effective tax burden over the last ten years. In Andalusia, since 2019 spouses and direct descendants benefit from a 99% reduction in the tax due. Madrid has applied similar reductions for decades. Valencia introduced a 99% reduction for spouses and direct descendants in 2023. Catalonia operates a more nuanced reduction depending on the size of the estate and the relationship to the deceased. The differences across regions can mean a tax bill of zero in Andalusia versus tens of thousands of euros in another region for an identical estate. Our overview of regional reductions and their impact on foreign heirs is published in our guide to reducing Spanish inheritance tax for international families.
The choice of region is determined by the deceased’s last habitual residence (for residents) or by the location of the most valuable Spanish asset (for non-resident deceased). Heirs cannot choose the region they would prefer. The European Court of Justice judgments of 2014 and 2018 forced Spain to extend the regional reductions to non-resident heirs and to heirs of non-resident deceased, so that there is no longer a tax disadvantage for foreign families — but applying the reductions correctly requires a precise reading of the regional rules in the file.
How to keep a file on track when probate abroad is slow
Probate in England and Wales currently takes between four and sixteen weeks for a straightforward estate and many months for a complex one. New York and California can be similar. The Spanish six-month clock does not care. The strategy that works in practice is to decouple the two procedures: the Spanish file is built independently of foreign probate, using the death certificate, the will (which can be a UK will in the UK or a Spanish will), and the heirs’ identification documents. The deed of acceptance and the tax filing happen in Spain regardless of where foreign probate stands. Once foreign probate is granted, the heirs use it for the foreign assets, but it is not needed for the Spanish file. This decoupling is the single most important advice we give to British and American families, and it is covered in detail in our guide to the Spanish inheritance power of attorney.
When the file simply cannot be completed in six months for genuine reasons — the heirs are unknown, there is a will dispute, or the assets are still being located — the correct path is to request the six-month extension within the first five months, and then to file a provisional declaration close to the twelve-month mark, supplementing it later if necessary. This is far preferable to allowing the surcharges to start. Our team manages this trade-off daily, and the early consultation page on our site explains how to book a consultation with an inheritance lawyer in Spain.