beta This part of GOV.UK is being rebuilt – find out what beta means

HMRC internal manual

Capital Gains Manual

Annual exempt amount: exploitation: challenge

It is essential to find out all the relevant facts and to examine all relevantdocuments, for example, correspondence, minutes of discussion, deeds or declarations oftrusts. It may well be necessary to interview the interested parties to obtain thecomplete picture. You will need to weigh the tax at stake against the resource cost of achallenge.