Property affordability, rent versus buy, and property tax. The rent-versus-buy comparison is the one worth spending time on: it is genuinely close for most people, and small changes in assumptions flip the answer.
Calculate property tax
Compare renting vs buying
Free Spain property tax calculator. Work out the transfer tax (ITP) on resale homes by autonomous community, VAT plus stamp duty (IVA + AJD) on new builds, and the annual IBI.