A tool for landlords
Rental deposit calculator (fianza)
Tell me the rent and what you let, and I will tell you how much fianza you may ask for by law, the maximum extra guarantee, and where to lodge it in your región. No sign-up. The fianza is the deposit Spanish law obliges you to take, and in most regions to hand over to a public body.
What are you letting?
Lodging the deposit in Comunidad de Madrid
- Where: Agencia de Vivienda Social (antes IVIMA)
- Deadline: 30 días hábiles desde la firma del contrato
- If you do not: recargo del 2% (5% pasado un año) y posibles multas
What the law says (LAU, art. 36):
- The compulsory fianza is one month's rent for homes and two months' rent for non-residential use (shop, office).
- For homes you may agree an extra guarantee (a bank guarantee or additional deposit) of at most two further months on contracts of up to 5 years (7 if the landlord is a company).
- In most regiones the landlord must lodge the fianza with a public body, each with its own deadline and penalties. The money belongs neither to you nor to the tenant while the contract runs.
Is the flat in Madrid? We cover it in detail there: full guide to the fianza in the Comunidad de Madrid. And if you are preparing the contract, see the documents to ask a tenant for.
Soycasero keeps track of the fianza for you: it records whether it is lodged or in your custody, and reminds you of your región's deadline and every other date in the contract. Try it free.
Amounts and deadlines are indicative and may change under regional rules; always check your región's official source before signing or lodging. This tool offers general information to orient you, not legal or tax advice. It creates no professional relationship and does not replace the advice of a lawyer, gestor or adviser for your particular case. The rules change and may vary by región. Last updated: July 2026.