Don't get caught off guard at the notary. You are liable for the municipal Plusvalía (based on the land value increase) and Capital Gains Tax. Crucially, if you are a non-resident in Spain, the buyer is legally required to withhold 3% of the purchase price and pay it directly to the tax office (Hacienda) on your behalf. We calculate all these exact costs before we set your asking price, so you know exactly what your net profit will be.