We have bought a house in Carcassonne & my wife intends to move there full time before Brexit. I will continue working & living in the UK for a couple more years spending weekends & holidays in France. We have been informed that when my wife registers as living in France then the house in France will be treated as our main residence. When we eventually sell our house in the UK will we have to pay capital gains on the sale of the UK property, if so will this be in the UK, France or both. I understand the capital gains in the UK, but if we have to pay capital gains in France would this be on the gains made after it became our second home. i.e We will have owned the UK property for 17 years but it would only have been our 2nd home for 2 or 3 years. In france would we have to pay capital gains on the difference between buying 17 years previously & the selling price or just pay capital gains on how much the house value has gone up in the 2 or 3 years since it became our 2nd home. If we have to pay on the full 17 years then we would need to sell before my wife starts to live in France.ThanksGed