Quick CGT / Ex PPR now rental property question...

[UpTheIron]

I'm sure I've seen this answered here before but a search doesn't throw up anything...

Buy a house for £X and live in it as PPR.
Move out when start renting it, at which point value is £Y
Sell it for £Z after a number of years.

CGT is chargeable on Z-Y or Z-X? I assume Z-Y, i.e. the gain after it was no longer my PPR, but how is Y calculated?

In this instance it is possibly largely irrelevant as Z and Y will be very close to each other.

[Eric Mc]

£Z is the relevant number, not "£Y.

The gain is apportioned between the years it was your PPR plus three grace years and the total nuimber od years of ownersip. You will only have a chargeable gain on the gain relevant to the years it wasn't your PPR.