On 3 March 2026 Rocío signed the sale of the flat she had inherited from her father, for €210,000. At the notary's office she was told that "the town hall part" would come later, and what came in September was a phone call from the buyer: the land registry would not record his purchase because nobody had shown that the plusvalía municipal (the municipal tax on the increase in value of urban land, charged when a property changes hands) had been dealt with. The thirty-working-day deadline had run out in mid-April. Almost five months late, with a tax bill of around €1,900, Rocío wanted to know two things: how much being late was going to cost her and whether she was still in time not to overpay.
The short answer is that, as long as the town hall has not written to her, what she pays is a recargo (a surcharge for filing late unprompted) and not a fine, and that the sensible thing is to file as soon as possible. The long answer depends on three things worth looking at in this order: how her municipality manages the tax, whether the land really increased in value, and which of the two calculation methods works out better for her. Everything else about this tax is on our plusvalía municipal page.
The plusvalía clock does not start where people think
The tax, officially the tax on the increase in value of urban land, is governed by articles 104 to 110 of the consolidated Local Government Finance Act, approved by Real Decreto Legislativo 2/2004. Article 110 sets the deadlines, and each town hall's bylaw (its ordenanza fiscal) develops them:
| Transaction | Deadline to file | Counted from | Who the taxpayer is |
|---|---|---|---|
| Sale | 30 working days | The date of the deed | The seller; if the seller is a non-resident individual, the buyer steps in as substitute taxpayer |
| Gift | 30 working days | The date of the gift | The recipient of the gift |
| Inheritance | 6 months, extendable by another 6 if requested within the deadline | The date of death | The heirs |
Thirty working days are not the same as a month: Saturdays, Sundays and public holidays, local ones included, are left out. That is why almost nobody knows exactly which day their deadline expired, and it is worth working it out with the municipality's calendar before talking about months of delay. With inheritances the usual stumble is a different one: the extension has to be requested before the six months are up; requested afterwards, it is no use.
Surcharge or penalty: decided by a letter that has not arrived yet
As long as the town hall has not started any action aimed at collecting the tax from you, filing late costs the surcharge in article 27 of Ley 58/2003, the General Tax Act (Ley General Tributaria). It applies to local taxes just as it does to national ones: 1 % plus one extra point for each full month that has passed since the deadline ended, and from twelve months onwards 15 % plus late-payment interest. If you pay the whole tax when you file and pay the surcharge within the period opened by its notification, the surcharge is cut by 25 %.
If, before you file, a formal request (a requerimiento) or an assessment issued by the town hall on its own initiative arrives, the picture changes: the surcharge disappears and the penalty regime in articles 191 and following comes in, with fines starting at 50 % of the unpaid tax, reducible by 30 % for accepting the assessment and by 40 % for prompt payment. Which piece of paper turns your delay into an offence is explained in what counts as a prior request.
Self-assessment or declaration: two different ways of being late
Each town hall decides in its bylaw whether the tax is self-assessed (you calculate it and pay it in) or whether it is enough to declare the transfer so that the town hall calculates it and sends you the bill. Under the first system, the surcharge is calculated on what you pay with the late self-assessment; under the second, on the assessment you are notified after filing the declaration late. In both, the first step is identical: file now, with the deeds in front of you.
Rocío's sums, line by line
The coefficients and the rate are set by each municipality's bylaw within the legal maximums. In this example we use them as assumptions, so that the mechanism can be seen:
- Period of ownership. Rocío did not acquire the flat when her father bought it, but when he died, in 2020. From 2020 to 2026 there are six full years.
- Actual-gain method. Value declared in the inheritance, €170,000; sale price, €210,000. The difference, €40,000, is multiplied by the land's share of the total cadastral value (valor catastral, the official value on the property register used for local taxes), which on her IBI bill (the annual municipal property tax) is 35 %: an increase of €14,000.
- Objective method. Cadastral value of the land, €48,000, times the coefficient for six years (let us assume 0.13): €6,240.
- Taxable base. The lower of the two is taken: €6,240.
- Tax. At a rate of 30 %, the maximum the law allows, €1,872.
- Surcharge. Four full months of delay: 5 %, that is, €93.60.
- Reduction. Paying everything on time, the surcharge comes down to €70.20. Total: €1,942.20.
Had Rocío let a whole year go by, the surcharge would have risen to 15 % (€280.80) plus interest. Had the town hall sent her a request first, the minimum penalty would be around €936 before reductions. The same oversight, three very different prices. If you would like us to look at your case with your own figures, tell us about it in the plusvalía municipal form and we will tell you what applies to you and how much it costs to put right. To check the exact percentage for your delay there is the late-filing surcharge calculator.
Before paying: is the tax really owed?
Constitutional Court judgment 182/2021 and Real Decreto-ley 26/2021 changed two things that matter especially to anyone who is late:
- If there was no increase in value, because the property was sold for the same as or less than it was acquired for, the transaction is not taxable. But this has to be declared and proved with the acquisition and sale deeds; the town hall does not presume it. We cover it in detail in when plusvalía is not payable.
- If the actual increase is lower than the one produced by the objective method, you can ask to be taxed on the actual one. The two calculations, side by side, are in the two ways of calculating plusvalía.
Filing late does not make you lose either option. What does make you lose them, in practice, is paying without looking: a refund afterwards exists, but it means opening a procedure and waiting.
Three things about a forgotten plusvalía the notary will not tell you
The first is that the town hall is going to find out anyway. Notaries are obliged to send it the list of deeds they authorise that trigger this tax (article 110.7 of the Act). The window in which you still pay a surcharge rather than a penalty therefore depends on how fast your town hall processes that information, not on whether anybody has noticed.
The second explains the buyer's phone call. The law also obliges the buyer to report the transfer in sales (article 110.6), and article 254.5 of the Ley Hipotecaria, the Mortgage Act, bars the land registry from recording the deed unless it is shown that the self-assessment, the declaration or that report has been filed. Your oversight blocks his registration, and it is very common for him to be the first to notice.
The third is about money: the plusvalía you pay as seller is deducted as a cost of the sale when working out the gain in your income tax return. The surcharge is not: it is the price of the delay, not of the transaction. How that gain is calculated is explained in working out the gain when you sell.
A self-assessment sent after a formal request does not take you back to the surcharge regime. What you have to do then is answer within the period the letter sets, check whether the tax it proposes is correct (above all the method and the period of ownership) and weigh up the reductions of the penalty. Filing on your own without looking at the letter can double the payment and complicate the file.
The checklist to get it settled this week
- The sale deed and the document by which you acquired the property: earlier purchase, acceptance of inheritance or gift, with its date.
- The latest IBI bill, which shows the cadastral value of the land. If you are not sure how to read it, it is explained in the land value on the IBI bill.
- The municipality's tax bylaw, to know whether you self-assess or declare, and the coefficient and rate it applies.
- The online office of the town hall, or of the body to which it has delegated collection, which is where you file and pay.
- If you are a non-resident seller, confirmation of whether the buyer held back the amount of the plusvalía at the notary's office, because in that case the person obliged to file it is the buyer.
With those papers, the delay is fixed in an afternoon. Without them, every week adds a point of surcharge or brings the formal request closer.