Who pays municipal capital gains tax, the buyer or the seller?

What tax it is and who settles it

Municipal capital gains tax taxes the increase in value of urban land between acquisition and transfer. It is managed by the local council where the property is located. Although people colloquially refer to "property capital gains tax", technically the subject is the land, even if you are selling a flat in a multi-unit building.

Royal Legislative Decree 2/2004, approving the consolidated text of the Local Tax Authorities Act (TRLRHL), designates the transferor as the taxable person in standard sale transactions. This means that self-assessment or settlement rests with the seller, except in special cases provided for under the regulations, which must be verified case by case.

Buyer and seller: what the contract says does not always prevail

In real estate practice, it is common to see deposit contracts or draft deeds outlining who pays notary fees, land registry fees, tax authority liabilities or municipal capital gains tax. Sharing costs can be valid when parties negotiate on an equal footing, but in consumer relationships the law protects the buyer from clauses that impose tax obligations on them which the regulations assign to the seller.

Royal Legislative Decree 1/2007 (TRLGDCU) allows unfair terms in consumer contracts to be declared void. Transferring full payment of a tax to the buyer in a generic and unconditional manner, when the seller is the legal taxable person, falls squarely into the debate addressed by courts and authorities. Recent legal opinion is generally unfavourable towards such clauses, but every contract must be reviewed with professional advice.

Important: even if the buyer pays on behalf of the seller by private agreement, the obligation towards the municipality remains tied to the legal taxable person. A delay or error in settlement can incur surcharges for the person identified by law as liable.

Municipal capital gains tax and personal income tax (IRPF): two distinct taxes

Confusing municipal capital gains tax with capital gains under personal income tax (IRPF) is one of the most common mistakes when selling. IIVTNU is a local tax on land; IRPF is national and looks at the overall property transaction under its own rules. You may owe tax under one, both or neither, depending on values, dates and calculation methods. Do not assume that "losing money on the sale" means there is no municipal capital gains tax without calculating the land value separately.

To learn more about the municipal calculation, consult the guide on how municipal capital gains tax is calculated. For national capital gains tax, share the guide on personal income tax (IRPF) on the sale of a home with your tax advisor.

What should be agreed in writing before signing

• Who submits the self-assessment to the local council and within what timeframe.
• Whether there is a prior estimate of the amount (objective or real method, as applicable).
• How payment is apportioned in the transaction if the parties legitimately share other costs.
• What happens if the buyer advances funds: document it as a payment on account of the purchase price or reimbursement to the seller, not as an automatic substitution of the taxable person.

Before setting the net amount you require, include municipal capital gains tax in your expense budget alongside mortgage, service charges, notary fees and professional costs.

Exceptions and nuances to verify

Inheritances, contributions to companies, transfers without consideration or corporate transactions may have different rules regarding liability and tax accrual. Do not extrapolate the answer from a private sale between individuals to corporate or inheritance cases.

Some municipalities apply discounts in their local ordinances; other transactions may result in zero tax due if there is no increase in land value under current regulations. Request an estimate from the local tax office or a specialist firm dealing with that municipality.

Next step if you are planning to sell

Organising timelines, documentation and actual expense sharing prevents surprises on completion day. At Sky Real Estate, we assist with the sale process and coordination with the buyer and notary office; the specific IIVTNU tax settlement must be validated by your tax advisor.

If you need support marketing your home, you can view our property marketing and sales service.

Guidance content. Verify the TRLRHL (Art. 106 and regulations), the TRLGDCU and the municipal ordinance before signing contracts.