Sometimes it's a well thought-out plan - for example people who use their French property as a holiday home and then, once they retire, move there full time. In other cases people just love their French property so much that the decide to up sticks and move to France full time. But however it happens, there is some important admin once your French second-home turns into a main residence. READ ALSO: Is your French property a main residence or a second home (and why it matters)? Property tax designationAs a property owner in France, you will already be familiar with property taxes and the one-off property tax declaration (déclaration des biens immobiliers, sometimes also known as the déclaration d'occupation).