Filling out your Spanish income tax return can be daunting and mistakes can be made, so what happens if you submit your form with an error? Will you always have to pay a fine and how much will it be? Is there a way of correcting the mistake in time?
It’s easy to make a small mistake on your yearly income tax return in Spain, known as la declaración de renta. This is because there a so many questions and boxes to fill. The most important thing is to look over everything as carefully as you can.
Spain’s income tax return must be completed by June 30th 2026 for income related to 2025.
If you have any doubts about anything, it’s best to contact the Agencia Tributaria directly by phone, in person or on the web or to contact a tax professional and ask them to help you.
READ ALSO – GUIDE: How to complete Spain’s annual tax return
Even with double-checking though and being thorough, small mistakes may slip through. So what can you do?
Q: I realised after I submitted my tax return that it contained an error, what can I do?
A: It’s important to note that there are usually fines for any errors made on your return. These amounts can vary depending on the size of the mistake. Whether you omitted information on purpose or it was accidental, they could still possibly fine you.
If you have already submitted your return and realise later that you made a mistake, it’s important to rectify it as soon as possible and submit a second declaration voluntarily within the allotted time frame to do this, before the Treasury finds out.
Tax experts claim that the authorities will then take into account your income, circumstances and deductions on your last declaration to see if and how much you will be fined.
READ ALSO: 11 mistakes to avoid when filing your Spanish tax return
Q: Is there a way to modify a declaration that has already been submitted?
A: Yes, the Treasury explains two ways to do this on their website
If the error affects the taxpayer – either because they have to pay the Treasury more or less than what they should, they can request a modification of the error on the declaration that’s already submitted. This can be done online on the Agencia Tributaria website, as long as Hacienda hasn’t carried out the fiscal settlement yet.
If the error affects Spain’s Hacienda, the taxpayer can submit a complementary declaration, something that can also be done online under ‘Modificar declaración presentada‘.
You will need to either have a digital certificate or Cl@ve details to do all this online.
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Q: What are the fines if I don’t correct the mistakes on my Spanish tax declaration?
A: How much you get fine for making a mistake on la declaración de la renta can depend on numerous factors, including the severity of the error, whether it’s you who notices a mistake first or them, and how long passes before you pay. Generally speaking, for every month that you don’t pay the money back, the amount you owe will go up.
If the mistake is linked to minor tax fraud, in the sense that you have changed something and you have not specified it, Hacienda can fine you €100. Incomplete data or other mistakes can also lead to penalties of €150.
Even if you realise that Spain’s tax agency owes you money but you inform them after the tax deadline, they will pay you what’s owed but fine you €100. If it is the Treasury that realises the error before you, the penalty goes up to €200.
If you have any erroneous deductions that don’t correspond to you, the Treasury considers this to be a serious infraction and the fine will be 15 percent of the amount you receive.
If fake invoices or supporting documents are used so that the declaration works out favourable to you and it’s more than €3,000, the fine is between 50 and 100 percent of the amount.
With more serious cases of fraud on your declaration, the fine can be up to 150 percent of the amount. When fraud is in the millions, the fine can be €30,000 and in very serious cases the amount rises to more than €300,000.
READ ALSO: What are the penalties and prison sentences for tax evasion in Spain?
Q: Will I always get a fine if I make a mistake?
A ruling by the Superior Court of Justice of Galicia last year found that people have the “right to make a mistake” when filing their income tax return. This could set a new precedent across the country.
During the case, the accused’s lawyer, Nadia Vasallo, assured the court that he “had no intention of deceiving the Treasury,” but rather that “a tax advisor simply advised her on a complex operation.”
Most appeals by taxpayers who’ve been fined are won, but unfortunately the bureaucracy and cost involved mean it’s not necessarily worth fighting.
