Why so many years accumulate
Nobody sends a reminder. There is no annual notice, no form in the post, no accountant assigned at purchase. An owner buys a flat, lets it for part of the summer, pays the IBI when it is charged and reasonably concludes that the Spanish state has been dealt with. Years later a sale, an inheritance or a letter reveals that two separate obligations were running the whole time: tax on the rent, and tax on the notional income of the days the property stood at your disposal.
The good news is that this is one of the most fixable situations in Spanish tax. It has a published price, and you control most of it.
Step one: work out which years are still open
- Count back four years from the end of each filing period. The authority's right to assess prescribes after four years, counted from the day the filing period for that year closed. Years beyond that are closed and nothing needs to be filed for them.
- Check whether anything interrupted that clock. Any action by the authority addressed to you — a request for information, an assessment, even for a different tax on the same property — restarts it. So does any filing you made yourself.
- Split each open year in two. For each property and each owner you need the days it was let and the days it was available to you. They are declared separately, under different rules, with different deadlines.
Step two: gather, per year, per property, per owner
- Gross rental income, from platform statements or tenancy agreements, with the dates of each stay. The dates matter as much as the amounts, because costs are apportioned by nights let.
- Costs, with invoices in the owner's name: community fees, IBI, insurance, utilities, repairs, management commission, depreciation.
- The rateable value from the IBI receipt, and whether it has been revised in the last ten years. That single fact changes the imputed base from 1.1 % to 2 %, which is nearly double.
- Each owner's share. A couple holding two flats equally has four sets of returns per year, not two.
- A tax residence certificate for each year where you want the EU rate and the deduction of costs.
Step three: understand what late filing costs
The surcharge for filing late without being asked is set by article 27 of the General Tax Act and it is deliberately gentle at the start: 1 %, plus a further 1 % for each complete month of delay. Past twelve months it becomes 15 % plus late payment interest from that point. There is also a reduction of the surcharge where it is paid within the period given and the assessment is not challenged.
| How late | Surcharge on a 400 € liability | Total |
|---|---|---|
| 3 complete months | 4 % — 16 € | 416 € |
| 8 complete months | 9 % — 36 € | 436 € |
| Over 12 months | 15 % — 60 €, plus interest | 460 € and rising |
Now compare that with what happens if their letter arrives first. Once the authority has initiated anything, voluntary regularisation is no longer possible: the surcharge disappears and the penalty regime takes its place, starting at half the unpaid tax and rising with aggravating factors. On the same 400 €, the difference between coming forward and being found runs into hundreds of euros per year, per property, per owner — and there is usually more than one of each.
Four open years, two owners, one flat, roughly 400 € of tax a year each. Filed voluntarily and more than a year late, that is around 3,680 € including surcharges. Regularised after a letter, with penalties instead of surcharges, it is comfortably over 4,800 € before interest, and the file stays open for the rest of the procedure. The tax itself never changed. Only who moved first.
Step four: file, one return at a time
There is no consolidated return. You file one Modelo 210 for each combination of property, owner, year and type of income. Rental income is grouped annually from the 2024 tax year onwards; imputed income is filed under its own period code. For a couple with two properties and four open years, that is a stack of returns, which is why this work is quoted as a job rather than folded into a monthly fee.
Rates depend on where you live. Residents of the EU, Iceland, Norway and Liechtenstein pay 19 % on rent after allowable costs, apportioned to the days let. Everybody else pays 24 % of gross rent with nothing deducted. Whether that distinction survives is currently before the Spanish Supreme Court, which agreed by order of 15 July 2026 to examine whether excluding non-EU residents from deducting costs is compatible with the free movement of capital. Nothing is decided, and the prudent course while it is pending is described on our non-resident property tax page.
What usually goes wrong in a catch-up
| Problem | What to do |
|---|---|
| No invoices for the early years | Community fee statements, IBI receipts and bank records can reconstruct a great deal. What cannot be evidenced is not deducted, and that is better than deducting it and being asked |
| The platform no longer shows old statements | Ask them in writing. Most retain several years and will export on request. Bank credits give the totals meanwhile |
| No residence certificate for a past year | Certificates are issued for a specific year and your own authority can normally issue one retrospectively. Without it, expect the higher rate |
| A co-owner has died since | The estate's position has to be settled before those years can be filed, and that changes the order of work |
| The property has already been sold | Then this is urgent. Open years surface during the sale process, and the 3 % withheld by the buyer is held against them. See declaring a sale as a non-resident |
Do it before the letter, not after
Spain now receives property, banking and platform data from most countries you are likely to live in. Short-term rental platforms report host earnings, and cross-border information exchange between tax authorities is routine rather than exceptional. The practical consequence is that the window in which voluntary regularisation is available is narrowing, not widening. If you know there are years missing, the cheapest day to deal with it is today. Tell us the situation through the contact form and you will get a quoted figure for the whole catch-up before anything is filed.
John and Linda: a flat in Mijas since 2015 and no returns
John and Linda are British and bought a flat in Mijas in 2015. They use it in spring and let it for a few summer weeks to friends of friends. They pay the IBI, the community charges and the electricity, and assumed that was everything. Now they want to sell, and the buyer's lawyer asks for their Modelo 210 returns. There are none. What they stand to lose is the difference between catching up with modest surcharges and having the sale trigger a review in which the same years are assessed with penalties. They caught up before signing: surcharges, a little interest, no penalty, and the refund of the buyer's 3 % withholding came through with nothing left to hold it against.
Three calendars in five years
The Modelo 210 timetable has changed twice, which complicates the count. Until 2023, rental income was declared quarterly, in the first twenty days of the month after each quarter. Rent for 2024 and 2025 was grouped by year and filed between 1 and 20 January of the following year. Rent for 2026 will be filed between 1 and 20 April 2027 under Order HAC/623/2026. Imputed income has always had a long window: the whole following calendar year, which for 2026 runs from 1 April to 31 December 2027.
| Return | Window it had | Assessable until, unless interrupted |
|---|---|---|
| Rent, third quarter of 2022 | To 20 October 2022 | 20 October 2026 |
| Rent, fourth quarter of 2022 | To 20 January 2023 | 20 January 2027 |
| Imputed income, 2021 | To 31 December 2022 | End of 2026 |
| Rent for 2024 (annual) | To 20 January 2025 | 20 January 2029 |
| Imputed income, 2025 | During 2026 | End of 2030 |
The table is a guide: each date has to be checked against its own window and against anything that may have interrupted the four-year period. What it does show is that, in autumn 2026, several 2022 quarters and the 2021 imputed income are about to drop out of reach, and that the order of filing matters, as discussed in the order for catching up several years.
The 25 % reduction, worked on 450 € of tax
| Delay | Surcharge on 450 € | With the 25 % reduction |
|---|---|---|
| 5 complete months | 6 %: 27 € | 20.25 € |
| 10 complete months | 11 %: 49.50 € | 37.13 € |
| More than 12 months | 15 %: 67.50 € plus interest | 50.63 € plus interest |
The reduction depends on paying the surcharge within the period stated in its assessment. Set against the penalty regime, which starts at 50 % of the unpaid tax, the same 450 € more than a year late costs about 500 € if you come forward and 675 € plus interest if you are found, before any aggravating factor. While the Supreme Court case on non-EU residents' costs is pending, it may make sense to file in a way that keeps a later claim open; that is looked at file by file.