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This article forms part of the CostaLuz Lawyers blog and is published for general informational and educational purposes only. It was prepared with the assistance of artificial intelligence tools and, before publication, was substantively reviewed and editorially approved by Maria de Castro, a Spanish-qualified lawyer registered with the Cádiz Bar Association under number 2745, founder of CostaLuz Lawyers and the person responsible for the editorial review of the published content.
This article does not constitute legal, tax, immigration, employment, estate-planning or investment advice and does not replace an individual assessment and the professional work of the appropriate CostaLuz Lawyers specialist. No action or omission should be based solely on this information.
When a co-purchase, an inheritance, or a relationship ends, one owner buying out the other is common in Spain — and the tax treatment of doing it correctly is very different from an ordinary sale.
The mechanism: extinción de condominio
Extinción de condominio is the legal procedure used to end shared ownership of a Spanish property. One co-owner ends up with full ownership, and compensates the other for their share — most commonly used after a divorce, an inheritance shared between siblings, or a co-purchase that no longer works for both parties.
Why the tax treatment is so different from a sale
A standard property transfer in Spain is taxed at 6 to 10 per cent, depending on the region. An extinción de condominio, by contrast, is taxed at only 0.5 to 1.5 per cent, because Spanish law does not treat it as a sale — it is simply the formal end of a shared ownership arrangement, which is precisely why doing it through the correct legal mechanism matters.
What if the other owner will not agree?
If the co-owners cannot reach an amicable agreement, the process can still proceed through a legal procedure that results in a forced sale of the property, with the proceeds then divided between the co-owners according to their respective shares.
Do not forget the mortgage
If there is an outstanding mortgage, the co-owner leaving the title needs to be formally released from liability on the loan — typically through the remaining owner refinancing or being substituted as the sole borrower. Without this step, the departing co-owner can remain legally responsible for a debt on a property they no longer have any stake in.
Call us today on +34 919 499 342 or email marialuisa@costaluzlawyers.es to handle a co-ownership buyout the correct, tax-efficient way.
Frequently Asked Questions
What is the legal process for one co-owner buying out the other?
The standard mechanism is extinción de condominio — a notarial procedure that ends the shared ownership, with one party keeping full ownership of the property and compensating the other for their share.
Is this the same as a normal sale between the co-owners?
No, and that distinction matters for tax. A standard property transfer in Spain is taxed at 6 to 10 per cent depending on the region, while an extinción de condominio is taxed at only 0.5 to 1.5 per cent, because it is not legally treated as a sale.
What if the other co-owner will not agree to sell their share?
If an amicable agreement cannot be reached, extinción de condominio can be pursued through a legal procedure that leads to a forced sale of the property, with the proceeds split between the co-owners.
Does this work if there is still a mortgage on the property?
It can, but the outgoing co-owner needs to be released from the mortgage liability as part of the process — usually by the remaining owner refinancing or being formally substituted on the loan — or they remain legally liable for a debt on a property they no longer own.
Do both parties need to attend the notary together?
Yes — both co-owners (or their authorised representatives) need to be part of the notarial deed that formally ends the co-ownership and transfers full title.
Changing who is on a title is not limited to co-owner disputes — see our guide to adding a spouse to a property title after marriage.
Ending a shared ownership and gifting a share to family are two different routes to the same goal — see our guide to gifting a Spanish property to your children.