The calculation of the taxable gain on a property that's been your home for some of the time you've owned it is very complicated. The starting point is the difference between the selling price and the buying price, of course, but as well as indexation - allowance for inflation - you only pay on the proportion of the gain attributable to the time it wasn;t your home, plus 2 years. (It's not true that CGT is only charged on a property let for 3 years or more.) You also get relief for the costs of buying and selling, and any improvements you've made to the property. As I say, it's complicated! However, I wouldn't think that CGT on the property you describe would amount to much at all, if anything.