You gain some, you lose some
If you own a property in Portugal you may have to pay capital gains tax when you sell it. You may have to pay tax in both Portugal and also your home country depending on your residence status. Whether or not you pay Portuguese capital gains tax will depend on whether you are resident, how you own the asset and whether it is your main home.
For Portuguese residents there are various reliefs available, If you are interested in Capital Gains Tax savings or would like to know more about tax efficient investments then please get in touch using the following link.
For non-Portuguese residents, the full gain from the sale of a property in Portugal is taxable at a flat 28% rate. If you require more information regarding the tax treatment then please get in touch using the above link.