Registro de fianza de alquiler (depósito obligatorio en tu CCAA)

What you need

1. Be the arrendador (or an authorised representative) of the property.
2. Have Cl@ve, certificado digital or a working DNIe. Without one, your comunidad's sede won't let you in.
3. Know the monthly rent, the signing date and the contract duration.
4. Have the referencia catastral. Get it at https://www.sedecatastro.gob.es in 2 minutes.

Documentation

1. Contrato de arrendamiento firmado (PDF completo, legible, sin páginas cortadas).
2. DNI/NIE of landlord and tenant.
3. Referencia catastral and address of the property.
4. Importe de la fianza (1 mes vivienda / 2 meses uso distinto; LAU art. 36).
5. IBAN del arrendador (for future refunds).
6. Proof of payment of the deposit if your CCAA asks for it before registering.

Step-by-step

1. Go to sedecatastro and copy the referencia catastral. They'll ask for it, no exceptions.
2. Calculate the legal fianza by use: 1 mensualidad (vivienda) or 2 (local/office). Don't mix it up with extra guarantees: this is the legal fianza.
3. Prepare the contract as a PDF. If it's too big, convert to PDF/A or compress it (many sedes cap files at 10–15 MB).
4. Log in with Cl@ve or certificado to the sede of your comunidad autónoma and search “Depósito de fianzas de arrendamientos urbanos”. Names you'll see: AVRA (Andalucía), Agencia de Vivienda Social (Madrid), INCASÒL (Catalunya), GVA Vivienda (C. Valenciana), IGVS (Galicia), Vivienda del Gobierno de Aragón, etc.
5. Fill the form: landlord and tenant details, property, referencia catastral, rent and importe de fianza. Attach the contract.
6. If your CCAA requires an ingreso/transferencia to an official account, make it and upload the receipt. Others will handle it for you. Follow the portal instructions carefully.
7. Sign and submit. Download the resguardo and keep it (PDF). If they request subsanación, you have 10 días hábiles to fix it.

Tricks

1. The deadline is usually 1 mes from signing. Don't leave it to the last day: it's the sort of admin that can bite you for a tiny mistake.
2. Keep the resguardo with the contract. They'll ask for it in inspections or if the tenant claims the deposit.
3. If you own properties in different CCAA, make a per-community checklist: each one changes the form and what they accept as a valid “justificante”.
4. If you don't have Cl@ve, activate it now at https://clave.gob.es. It takes no time and saves you a presencial cita.
5. Check that the importe de la fianza matches the contract exactly. Even a cent off and they'll return it for subsanación.

Common mistakes

1. Depositing outside the comunidad where the property is. Result: null procedure.
2. Uploading an incomplete contract (missing annexes or signatures). They'll reject it.
3. Confusing the legal fianza with additional guarantees in the contract. Only the legal fianza (1 or 2 months depending on use) goes here.
4. Not attaching the transfer receipt when your CCAA needs it before validation.
5. Leaving it to the last minute and getting a fine for late presentation. Totally avoidable if you do it in the first week.