Buyers often assume IBI is automatically split between buyer and seller in the year of purchase — legally, it is not, and knowing the real rule avoids an unwelcome surprise or an unresolved dispute at completion.
The January 1st rule
Spanish law makes whoever is the registered owner of a property on 1 January of a given year liable for the full year’s IBI (Impuesto sobre Bienes Inmuebles). This rule is absolute from Hacienda’s perspective — it does not matter that the property changes hands a few weeks or months later in the same year.
What this means in practice for a mid-year purchase
If a seller owned the property on 1 January and sells it in, say, June, the seller remains the person legally liable for that entire year’s IBI bill under the statutory rule — not the buyer who takes over ownership partway through.
Why most buyers still end up paying a share
In real transactions, it is standard practice for buyer and seller to privately agree to split the year’s IBI on a pro-rata basis, based on the number of months each side actually owned the property. This is a civil agreement, not a legal requirement — so it should be explicitly negotiated and included in the purchase contract rather than assumed to happen automatically.
What happens without an agreement
If no proration is agreed, the statutory default stands: the January 1st owner is the one Hacienda holds responsible for the full year, regardless of the sale. Raising the split during negotiation, rather than after completion, is what actually protects a buyer’s position.
Call us today on +34 919 499 342 or email marialuisa@costaluzlawyers.es if you want this proration built properly into your purchase contract.
Frequently Asked Questions
Who is legally responsible for IBI in the year I buy a property?
Whoever is the registered owner on the 1st of January of that tax year is legally liable for the full year’s IBI — even if the property is sold or bought partway through the year.
So if I buy in June, does the seller pay the whole year’s IBI?
Legally, yes — if the seller owned the property on 1 January, they remain the person Hacienda holds liable for that year’s bill in full.
Does that mean I never have to contribute to the year I bought in?
Not in practice. While the law assigns full-year liability to the January 1st owner, it is very common for buyer and seller to privately agree a pro-rata split of the year’s IBI based on how many months each of them actually owned the property.
Is this proration automatic, or does someone have to ask for it?
It is not automatic under the law — it is a private civil agreement between buyer and seller, so it needs to be explicitly negotiated and, ideally, written into the purchase contract rather than assumed.
What happens if the buyer and seller do not agree on a split?
Without an agreement, the legal default applies: the January 1st owner remains responsible for the whole year’s bill, regardless of how the property changed hands afterward.
Utilities are one of several practical tasks that follow completion — see our guide to transferring utilities after buying a property in Spain.
This content has been prepared with the assistance of artificial intelligence and reviewed by María Luisa de Castro, a lawyer specialising in Real Estate Law and founder of CostaLuz Lawyers.
The information provided is general and indicative in nature. It should not be used as the sole basis for making professional, legal or investment decisions, and CostaLuz Lawyers assumes no responsibility for decisions taken solely on the basis of this content.
We always recommend personalised review by a qualified professional. For most of our services, initial personalised guidance is free of charge. Get in touch.