Lucía Ferrer lives in Zaragoza. Her father died on 14 March 2026 and left her, in equal shares with her brother, a flat, an investment fund and a current account. In April the two of them thought they would "deal with it in the summer, when the notary had a free slot". In July they found out that the bank would not let them touch the account and that the tax clock had been running for four months. The calendar of an inheritance is not set by the signing of the deed: it is set by the date of death.
The clock starts on the day of death
The Spanish inheritance and gift tax (Impuesto sobre Sucesiones y Donaciones, ISD) accrues on the day the deceased dies (article 24.1 of Law 29/1987). From that day, article 67.1.a) of the tax's Regulations (Royal Decree 1629/1991) grants six months to file the return or self-assessment. For Lucía, the deadline ends on 14 September 2026.
It makes no difference that there is still no declaration of heirs, that a copy of the will is still pending or that the siblings have not agreed on how to divide the estate. The tax deadline runs in parallel with all of that. The only thing that genuinely interrupts it is litigation over the estate: article 69 of the Regulations suspends the count if a lawsuit or court proceedings over the will are brought, and restarts it when the ruling becomes final. Opening a will before a notary, drawing up an inventory or obtaining an uncontested declaration of heirs does not suspend anything; the article itself rules those out.
The extension: six more months, but it has to be requested in time
Article 68 of the Regulations allows the deadline to be extended by another six months. It has three conditions that are worth reading slowly:
- It is requested within the first five months. Once the fifth month has passed, the tax office cannot grant it (article 68.4). For Lucía, the last day to apply was 14 August.
- It comes with the death certificate and with the details of the heirs, their relationship to the deceased, the location and approximate value of the assets and the reason for the request.
- If there is no answer within a month, it is deemed granted (article 68.3).
The extension is not free. Article 68.6 says that it starts to run when the initial six months end and that it carries late-payment interest from that point until the day the return is filed. It is a financing cost, not a penalty, and it is usually much lower than a surcharge; but it is as well to know it exists so that the assessment does not come as a surprise.
If the office refuses the extension, the deadline is lengthened by the days that passed between the application and the notification of the refusal (article 68.5), so nobody ends up out of time for having waited for an answer.
| Milestone | Date in Lucía's case | Legal basis |
|---|---|---|
| Death and accrual | 14 Mar 2026 | Art. 24.1 LISD |
| Last day to request the extension | 14 Aug 2026 | Arts. 68.2 and 68.4 RISD |
| End of the ordinary deadline | 14 Sep 2026 | Art. 67.1.a) RISD |
| End of the extended deadline | 14 Mar 2027 | Arts. 68.1 and 68.6 RISD |
| Limitation of the right to assess | four years from the end of the deadline | Art. 66 LGT |
LISD is the inheritance and gift tax law, RISD its Regulations and LGT the Spanish General Tax Law.
It is the mistake we see most often: in August or September the family realises it will not make it and files the request in the sixth month. That request cannot be granted and the deadline remains the original one. If you can see that you will not have valuations, documents from abroad or agreement between the heirs, request the extension before the fifth month ends, even if you do not end up using all of it.
What filing late without an extension costs
If the self-assessment is filed late and without a prior request from the tax authorities, article 27 of the General Tax Law does not impose a penalty but a surcharge: 1 % plus one additional percentage point for each full month of delay; from twelve months onwards, 15 % plus late-payment interest. If the tax is paid at the time of filing (or within the deferral period granted for that purpose), the surcharge is reduced by 25 %.
Let us look at the numbers. Suppose each sibling has a net taxable base of 100,000 € and that, applying the State scale in article 21 of the tax law and no regional reliefs, the gross tax is 12,415.36 € (9,166.06 € on the first 79,880.52 € and 16.15 % on the remaining 20,119.48 €). The autonomous community (Spain's regions, which set much of this tax) may have reductions and reliefs that change this figure a great deal; the example only serves to show how the surcharge works.
- Lucía files on 20 January 2027, without an extension. Four full months have passed since 14 September.
- Surcharge: 1 % + 4 points = 5 %.
- 12,415.36 € × 5 % = 620.77 €.
- If she pays on filing, it is reduced by 25 %: 620.77 € × 0.75 = 465.58 €.
- Had she requested the extension in July, she would only have paid late-payment interest on the tax for those four months, and no surcharge at all.
The picture gets worse if a request from the authorities arrives before filing. Then there is no longer a surcharge but a regularisation procedure with a possible penalty. And the authorities do find out: civil registries report deaths every month to the offices that manage the tax (article 32.2 of Law 29/1987), and notaries send quarterly indexes of the documents recording gratuitous transfers. There is more detail on how it is calculated in how much the surcharge for filing late is.
Meanwhile the bank freezes the account
Lucía's second surprise was a practical one: the bank refused to hand over the balance. That is not excessive zeal. Article 32.4 of Law 29/1987 prohibits financial intermediaries from handing assets over to anyone other than their holder unless payment of the tax or an exemption is proven, except with the authorisation of the tax authorities.
To avoid being blocked, article 89 of the Regulations allows a partial self-assessment on account for the sole purpose of collecting life insurance, withdrawing money on deposit or collecting debts owed to the deceased. It requires the agreement of all the heirs, is calculated on the value of those assets without reductions and is deducted later from the full self-assessment. It is a useful tool when the money in the account is exactly what is needed to pay the tax on the rest of the estate.
If you have reached this page with the inheritance already open and the deadline well advanced, you can give us the dates and assets in the inheritance form; the first thing we check is whether the extension can still be requested.
Other deadlines running at the same time
Inheritance tax is not the only step with a date on it. If the estate includes urban property, the tax on the increase in value of urban land (the municipal plusvalía) has its own deadline: six months from the death, extendable up to one year at the heir's request (article 110.2.b of the consolidated text of the Local Finances Act). They are two different extensions, before two different administrations, and requesting one does not give you the other. We explain it in the guide to the plusvalía on inheritances and gifts.
In addition:
- The certificate of last wills (the Spanish register that shows whether the deceased made a will) is not issued on the day of death, so in practice the first month goes on gathering documents.
- If any heir lives outside the European Union, they must appoint a representative in Spain before the filing deadline ends (article 18.4 of the Regulations).
- If the estate includes assets in another country, the deadlines there are independent. They are confirmed by the adviser the heir chooses in that country; we coordinate the Spanish side with that adviser.
How to organise the six months
A reasonable sequence for an inheritance without conflict:
| Month | Task |
|---|---|
| 1 | Death certificate, certificate of last wills, copy of the will or start of the declaration of heirs |
| 2 | Inventory: land registry extracts, bank certificates at the date of death, cadastral reference values |
| 3 | Decide whether to request the extension; calculate each heir's tax under the rules that apply |
| 4-5 | Deed of acceptance and division of the estate, or a private document if there is no property; partial self-assessment if cash is needed |
| 6 | Filing and payment of the appropriate form (Modelo 650 when the State's Agencia Tributaria, the Spanish tax agency, manages the tax) |
The order matters because the region that manages the tax and the rules that apply depend on where the deceased lived, and that determines which form is used. We develop this in which autonomous community applies to my inheritance and, with more detail on the extension, in the guide to deadlines and extensions in the ISD. If the problem is not time but money, see the options when there is no cash to pay the tax.
Lucía and her brother did not request the extension because nobody told them it had to be requested in the fifth month. They filed in January with a reduced surcharge that could have been avoided.
The Salama Tax page on inheritance and gifts sets out how we handle these files when there are non-residents or assets in several countries, which is where deadlines tend to get complicated.