Two months of season and a proportion you have to hold up
With letting concentrated in July and August, the tax result is not decided by the income: it is decided by how much of the year's cost you can attribute to those weeks. The rule is the split by days of genuine letting, and the remaining days generate imputed property income instead of a deduction.
It is the most frequent review on this kind of property because it is the cheapest to run: the declared income is simply compared with the costs deducted. What holds it up is ordinary paperwork — the booking calendar, cleaning invoices, the platform's statements — rather than a report. The hard part is remembering to keep it in the year it happens. The arithmetic is in apportioning costs by nights let.
It is worth being concrete about what the split covers. IBI, the annual local property tax, the ordinary community fees, the insurance, the supplies consumed during the stays, the interest on any loan and the depreciation of the building all go in by the same proportion of days. Cleaning between guests and the platform's commission behave differently: they belong to the letting itself and are attributed to it directly.
Not every derrama — the extraordinary levy the owners of a building vote to fund works — is a deductible cost of the year. Where it finances an improvement or works that increase the value of the property, it is not deducted as an expense: it is added to the acquisition value and comes back through depreciation and on the day of sale. Where it is for conservation or repair, it is deducted, apportioned. The distinction is made by reading the minutes of the junta de propietarios, the general meeting of the owners, and not the payment slip.
Inheritance in Cantabria
The Impuesto sobre Sucesiones y Donaciones, Spanish inheritance and gift tax, is devolved to the autonomous communities, and Cantabria has established reliefs in the tax payable for the closest relatives — the so-called Group II, which covers the spouse, descendants of twenty-one or over and ascendants — on top of the state reductions.
You will not find a percentage here, and that is deliberate: these reliefs are amended frequently and what applies is the rule in force at the date of death, not the one at the date the deed is signed nor the one somebody read three years ago. We check it for your case, with the specific year in front of us.
These reliefs also sit on top of the state reductions rather than replacing them, so the order in which the calculation is done matters. It is the step that most often goes wrong in a self-assessment prepared without help, and it goes wrong in both directions.
Six months, and what you do if you cannot make it
The deadline to settle an inheritance is six months from the death. An extension can be applied for, but only within the first five months: past that point there is no extension left to ask for, and what runs are surcharges and interest.
The value of the properties is not set by the family: the tax rules refer to a reference value fixed administratively, which can be disputed, but with evidence and through the channel provided. And if there is no liquidity to pay, there is the route of deferral or payment by instalments, which is examined before the due date and not after. We look at it in deferring or paying a debt in instalments.
Who writes to us from Santander
| Who | What they need |
|---|---|
| Owner of a flat let only in summer | The split by days and which special levies are deductible |
| Heirs to a home in the city | The Cantabrian rule at the date of death and the six-month deadline |
| Somebody inheriting without the money to pay the tax | An extension within five months and payment by instalments |
| An owner living outside Spain | Modelo 210 per property and per owner, let or empty |
| A family about to sell what they inherited | Acquisition value from the inheritance, the gain and plusvalía municipal |
Working with Santander, remotely
On inheritances, from the first month. Six months looks like a lot and it is not: between gathering bank documentation, tracing properties and obtaining certificates, half the period goes by without anything visible having been done. Starting in month five is how families end up asking for an extension they can no longer request.
We work by email, at a fee agreed before we start, without your having to come to an office. Where the valuation of an asset is genuinely arguable, we tell you that it is, what defence it has and what sustaining it costs. What we do not do is promise you a result.
An inheritance in Santander, date by date
A Santander resident dies on 12 March 2026, leaving his flat on Calle Castelar and a bank account to his two children. Several deadlines start running that same day, and none of them waits until the family has found all the papers.
| What | Deadline in this case |
|---|---|
| Ask for an extension of Inheritance Tax | Before 12 August 2026 |
| File Inheritance Tax | 12 September 2026; with an extension, six more months, with interest for that period |
| Municipal plusvalía on the flat (the local tax on the rise in urban land value) | Six months, extendable to a year if requested within the first six |
| The deceased's 2025 income tax return, which he did not get to file | Campaign from April to June 2026, filed by his heirs |
| The deceased's 2026 income tax return, 1 January to 12 March | 2027 campaign |
If the siblings do not ask for an extension and file on 14 November, they are two full months late: a 3 % surcharge. With a tax of, say, 6,000 €, that is 180 €. Small, but avoidable, and each month adds another point, up to 15 % plus interest after a year. If the return is filed on time but the tax is high, deferral or payment in instalments can be requested, within the deadline. How to ask for the extension is in deadlines and extension of the tax. The Cantabrian reduction or relief available to children is checked against the rules in force on 12 March 2026.
The inherited Santander flat let for the summer while the family decides
Many Santander families do not sell straight away: they let the inherited flat in July and August while they decide. From the date of death, the rent belongs to the heirs in their shares, each declares it in their own return, and depreciation is calculated on the value given to the property in the inheritance, not on what the father paid. That value is also the starting point if it is later sold: the more care taken in setting it in the inheritance, the fewer surprises at the sale.
When one of the children lives outside Spain, the inheritance is still taxed in Spain on what the deceased had here, and the non-resident heir can apply the rules of Cantabria, where the deceased lived, instead of the state rules. What changes is how it is filed: the non-resident settles with the state tax administration and not with the region, on a form of their own. It is organised at the start, because the two siblings file the same day through different channels.
Once the death is reported, the bank freezes the account and does not release it to the heirs without proof that the tax has been dealt with. At the same time, the tax has to be paid first. Many banks allow it to be paid out of the deceased's own account, but each has its own procedure and timing, and it is worth asking in the second month, not the sixth. If you want us to handle it from the start, begin with the inheritance form.