ICO guarantee and young buyer mortgages: how to buy a home with less than 20% saved
Updated: July 12, 2026
The biggest wall when buying a first home usually isn’t the monthly payment — it’s the down payment: that 20% the bank won’t finance, plus the costs. For a €200,000 apartment, that means around €55,000-60,000 in savings. Public guarantees exist precisely to get over that wall.
The ICO guarantee, in short
The State, through the Instituto de Crédito Oficial (Spain’s official credit institute), guarantees part of the mortgage to your bank — as a general rule up to 20% of the price (extendable to 25% if the home has a high energy efficiency rating). With that guarantee, the bank can lend you up to 100% of the value of the home: the guarantee plays the role of the down payment you don’t have.
Key points of the programme:
- Who it’s for: young people up to age 35 and families with dependent children, buying their first primary residence in Spain.
- Income limits: around €37,800 gross per year per borrower (double if two people sign), with increases per dependent child.
- Price limits: they vary by province; the programme sets caps so that the guarantee focuses on affordable housing.
- It is not a subsidy: you still owe the whole loan. If something goes wrong, the State pays the bank the guaranteed portion… and then claims it back from you.
- Validity and participating banks: the application window has been extended repeatedly since 2024; confirm the current validity and the participating lenders on the official ICO website before planning your purchase.
What the guarantee doesn’t fix
The guarantee replaces the down payment, not the costs or the monthly payment:
- The purchase taxes and costs (10-12%) still come out of your pocket. Check the details in the costs guide and the ITP (Impuesto de Transmisiones Patrimoniales, the property transfer tax) in your region with the ITP calculator — note that many regions also have reduced rates for young buyers.
- Financing 100% means a higher monthly payment and more years paying interest. The 35% debt-to-income rule applies just the same: check it with the calculator on this page.
- The bank still assesses your creditworthiness. The guarantee reduces its risk, it doesn’t eliminate it: without stable income there will be no mortgage, with or without the ICO.
Young buyer mortgages and regional guarantees
Beyond the ICO, several autonomous communities maintain their own guarantee programmes for people under 35-40 (Madrid, Galicia, Murcia or La Rioja, among others), which can be combined with or used instead of the national one depending on the case. And almost every bank markets some kind of young buyer mortgage with more financing or sharper rates — you’ll find them identified in our mortgage comparison.
The sensible strategy: first work out how much you can pay per month, then what home price that implies, and only then look at which combination of guarantee + mortgage gets you there. Start below. 👇