Late filing surcharge calculator
If you file yourself, before the tax office writes to you, there is a surcharge but no penalty. This is what it would cost.
What you need in front of you
Three things. The amount the return showed as payable — the tax, not the turnover. How many complete months late you will be when you actually file, counted from the end of the normal filing window. And whether you will pay on time and not appeal, which is what unlocks the reduction.
How the surcharge works
Article 27 of the General Tax Act sets a surcharge of 1 %, plus a further 1 % for each complete month of delay, for returns filed voluntarily outside the normal window. Once twelve months have passed the surcharge is 15 %, and on top of that late payment interest runs from the day after those twelve months ended.
Months are counted as complete months. Filing on the 21st, one day after the window closed, is not the same as filing the following month: the first is 1 %, the second is 2 %. That is why the single most useful thing to do with a late return is to file it today rather than at the weekend.
If you pay within the period you are given and you do not appeal either the assessment or any penalty, the surcharge is reduced by 25 %. It is automatic in the sense that it is granted, and reversible in the sense that it is withdrawn if you later appeal. Worth knowing before you decide to argue about something small.
All of this applies only if you move first. If the Spanish tax office issues a formal request before your return arrives, there is no surcharge: there is a penalty, which runs from 50 % to 150 % of the tax unpaid depending on whether there was concealment or fraudulent means. Reductions for agreeing and for prompt payment can bring it down, but always from a far higher starting point.
An example
A quarterly VAT return with 1,200 € payable, filed three months late, paid on time and not appealed: a surcharge of 4 % (48 €), less the 25 % reduction (12 €). Total 1,236 €. If instead a formal request arrives first, the minimum penalty already starts at 50 % of the 1,200 €.
The same facts, three outcomes
| Scenario | What applies | Approximate cost |
|---|---|---|
| You file at three months and pay | 4 % surcharge, less 25 % | 36 € on the tax |
| You file at fourteen months | 15 % plus interest | Around 190 € |
| A request arrives before you file | Penalty, minimum 50 % of the tax unpaid | From 600 € |
The difference between the first row and the third is not the delay. It is who moved first.
What counts as a formal request
This matters, because it is the switch between the two worlds. Broadly, any administrative action taken with your formal knowledge that is directed at recognising, regularising, checking, assuring or settling the tax in question closes the voluntary door for that tax and that period. A generic information letter usually does not; a request for documentation about a specific period does. If something has arrived and you are not sure which it is, that question is worth answering before you file, not after.
What to do
- File as soon as possible. Every complete month adds a point.
- File every affected period, not only the one worrying you. Partial regularisation leaves the rest exposed and signals where to look.
- Keep the filing receipt. It is what evidences that you moved first, and its timestamp is the whole argument.
If you cannot pay right now
Filing and not paying is better than not filing. You can apply to defer or pay by instalments, and below a statutory threshold no guarantee is required. Enforcement proceedings, with their additional surcharge of up to 20 %, only appear if the voluntary payment period is allowed to lapse without either paying or applying.
Information returns follow a different road
The article 27 surcharge applies to self-assessments with tax to pay. Information returns — the 720 on foreign assets, the 349 on intra-EU transactions, the 390 annual VAT summary — have their own penalty regime, with fixed amounts per item omitted or wrong. Filing one late without a prior request also attracts reductions, but the mechanism is different and the two should not be mixed up.
What changed in 2021
Until the General Tax Act was amended by Act 11/2021, late-filing surcharges worked in bands: 5 %, 10 %, 15 % and 20 % depending on whether three, six or twelve months had passed. The current system is progressive and much gentler in the early months. If you are reading an older guide, or an older piece of advice, check which system it describes before relying on the figure.
How to stop needing this calculator
Surcharges almost never come from a shortage of money. They come from a date that went past. Our internal calendar works backwards from the direct debit deadline, which falls several days before the filing deadline, and we ask for documentation ten days before that. It is the dullest part of the service and the part that saves the most money. See the Spanish tax calendar for every date, and pricing if you would rather not track them yourself.
Questions we get asked about your late returns
What if I have no money to pay now?
File anyway and apply to defer. Not filing is the worse option: the surcharge grows every month and a penalty is far worse than either.
Does it run from the day after the deadline?
Complete months are counted from the end of the voluntary window. Filing on the 21st is not the same as filing the following month.
Several years are late. Where do I start?
With all of them, and preferably in one go. Tell us what is outstanding and you will get a fixed price before anything is filed.
Month by month on 1,200 € of tax
| Complete months late | Surcharge | If paid on time, without appeal |
|---|---|---|
| 1 | 2 %: 24 € | 18 € |
| 3 | 4 %: 48 € | 36 € |
| 6 | 7 %: 84 € | 63 € |
| 11 | 12 %: 144 € | 108 € |
| More than 12 | 15 %: 180 €, plus interest | 135 €, plus interest |
A quarter filed one month late carries 2 %, which the reduction turns into an effective 1.5 %. Against the risk of a 50 % penalty, there is nothing to weigh.
Two conditions for keeping the 25 % off
The reduction needs both at once: that the surcharge is paid within the period stated when it is assessed, and that the tax on the late return itself is paid too — either then, or under a deferral granted with a guarantee. Appeal the surcharge or the assessment and the reduction goes.
Interest from the thirteenth month
For the first twelve months the surcharge takes the place of late-payment interest. From month thirteen both apply: the 15 % surcharge and interest from the day after the twelve months are completed until the date of filing. The interest rate is set each year in the State budget act.
A late return must name its own period
The late return has to identify expressly the period it relates to and contain only that period's figures. Slipping a forgotten quarter's income into the next quarter's return is not regularising: it files both wrongly, and the tax office treats it as an infringement.
Two situations with no surcharge
Information returns do not generate a surcharge; they have their own fines. And where you regularise the same facts and circumstances the tax office has already regularised for another period, within six months of that notification, the surcharge may not be charged. It is a narrowly defined case and needs documenting well.
Several years open: consistency first, then the oldest
When someone arrives with three or four years unfiled, the order matters less than consistency: everything filed has to tell the same story, and costs deducted on one basis one year and another basis the next are the first thing that stands out. The practical priority is the oldest year still open, since it is closest to prescribing and carries the most surcharge; the period is four years from the end of the voluntary filing window.
What a surcharge does not cure
Filing late regularises the unpaid tax, not everything around it. A related information return keeps its own regime, and where the delay comes with false invoices or deliberate concealment, coming forward reduces the problem without removing it. That is why, when a matter has any depth, a lawyer looks at it before anything is filed: the first return in is the one that fixes the story.