CG13130 - Introduction and computation: occasions of charge: assets lost, destroyed or of negligible value: date of deemed disposal or reacquisition
The decision in Williams (H.M. Inspector of Taxes) v Bullivant [1983] established the general rule that the date of the deemed disposal and reacquisition is the date of the claim. Any resulting loss thus arises at the date of the claim. The date of the claim is the date on which the claim is received by HMRC.
Section 24(2) of the Taxation of Chargeable Gains Act 1992 explains the timing of the disposal and reacquisition of the asset and the conditions required to claim an earlier time.