by mullet on Wed Sep 01, 2010 6:48 am
If you simply move from one property to another there is no need to nominate a particular property as your main residence. Indeed, there is no statutory basis to do so. Just write to HMRC to advise a change of address in the usual way.
Private residence relief is calculated on a "straight line" basis. So if you sold that first property after owning it for 30 years, PRR would be 17 years of residence plus the final 3 years = 20 out of 30 years relief. You then get lettings relief, being the lower of the amount of PRR, the gain arising by reason of letting or the limit of £40,000. This is per owner, and the (strictly) correct way to prepare the CG computations is for you each to show 50% of the disposal consideration, original cost, enhancement etc, then PRR and then LR.
The value of the property at the time of first letting is not relevant as a change of use is not a chargeable occasion for CG purposes. That's my opinion, but Incredulum believes that a "just and reasonable" apportionment may well be able to take account of such valuation, particularly in times when property prices do not rise at an even rate within the period of ownership.