Capital gains tax (mais-valias) is a tax on the profit made from selling an asset like a house. Residents are typically taxed on 50% of the gain, which is often more favorable than the 100% inclusion used in the UK or the 36.2% total rate in France. Homeowners should note that the tax authority (Autoridade Tributária or AT) recently ruled that reinvestment benefits only apply to the original owner's share when buying a new property jointly.