The Spanish six-month inheritance-tax clock — and the month-five extension

Of all the dates in a Spanish estate, one matters more than the rest: six months from the day of death, the deadline for filing the Spanish inheritance-tax self-assessment — the Impuesto sobre Sucesiones y Donaciones, filed on Modelo 660 (the estate declaration) with a Modelo 650 for each heir. For a family living abroad this is the deadline that bites first, because it is usually already running while the family is still dealing with the funeral, the home-country paperwork and the question of whose law even governs.

The extension — useful, but only if you move early

Spanish law allows one extension, of a further six months. The catch that surprises families: the request must be lodged within the first five months after the death. Ask in month six and the answer is no — the window has closed. The extension is not free time either: late-payment interest runs on the extended period. But for a cross-border estate — foreign death certificate, apostilles, sworn translations, a grant at home, bank certificates — it is often the difference between an orderly filing and a scramble, and requesting it early costs nothing but the interest if you use it.

What happens if the deadline is missed

Filing late without an extension brings surcharges that climb with every month of delay, on top of interest — and a late estate also complicates everything downstream, because banks will not release Spanish accounts and the registry will not transfer Spanish property until the tax position is settled (the release paperwork requires proof of the filing). The tax deadline is, in practice, the estate’s master clock — it is why the frozen account stays frozen longer than it needs to when the clock is ignored.

Where does a family abroad file?

Spain’s inheritance tax is regional — but non-resident heirs file to the national tax office (the Oficina Nacional de Gestión Tributaria of the AEAT in Madrid) rather than to the region where the property stands. Since the EU-driven reforms, non-residents are entitled to apply the regional rules that would govern a resident in the same position — which matters enormously, because the regions are where the generosity lives: in Andalucía, close family currently enjoy a very large per-heir allowance and a further 99% relief, so many family estates on the Costa del Sol owe little or nothing — provided the return is actually filed, on time, claiming the reliefs correctly.

What has to be assembled before anyone can file

The reason the six months evaporate: the return cannot be filed on guesswork. It needs the death certificate (apostilled and translated where foreign), the Spanish wills-registry certificate (certificado de últimas voluntades), the will or the declaration of heirs, NIE tax numbers for each heir — obtainable from abroad under power of attorney — bank-balance certificates dated to the day of death, and property valuations. Assembling that set from another country routinely takes two to four months by itself. Start in month one, and the deadline is comfortable; start in month four, and you are asking for the extension you should have requested anyway.

This is precisely the clock we run. From the first call we date every step backwards from the deadline, request the extension early where the file needs it, and file with the reliefs claimed — as part of administering the Spanish estate for a fixed fee, agreed in writing before we start. (The figures above are procedural, not tax advice — where the numbers themselves need advice, we say so plainly and bring in the right adviser.)