What applies to the Modelo 210 if I buy a property and don't yet rent it out?

From the date of purchase, a pro-rata tax obligation generally arises — regardless of whether the property is rented, owner-occupied or left vacant. The calculation is made pro rata from the date of transfer of ownership (the date of the notarial Escritura). An owner who buys a flat on 1 July calculates imputed income for 184 days (1 July to 31 December), not the full year. The formula: cadastral value × imputation rate (1.1% or 2.0% per DA 55 LIRPF) × tax rate × ownership share × 184/365. There is no waiting until the first rental. The tax obligation attaches to ownership, not to use. Even if the property undergoes renovation after purchase and is uninhabitable for months, imputed income generally arises from the day of the notarial transfer. The deadline for the first declaration is 31 December of the following year (tax year 2025; from tax year 2026, changed deadlines apply per Orden HAC/623/2026). An owner who buys in July 2025 must file the pro-rata return by 31 December 2026 at the latest.