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

HMRC internal manual

Capital Gains Manual

Deferred consideration: unascertainable: future payments when received

There will be an occasion of charge when each future payment is received. This should be treated as a disposal or part-disposal of the right to receive the future payments. The acquisition cost of the right is the value of the right which has been brought into the original disposal computation.

Where losses accrue on disposals of certain rights on or after 10 April 2003 individuals and others within the charge to capital gains tax (but not companies within the charge to corporation tax) may elect to set off the loss in earlier years, see CG15080+.

Where a series of payments is received this will form a series of part-disposals. The value of the remaining right at each date will need to be ascertained to use the part-disposal formula. These valuations can be obtained in the same way as the original valuation of the right, see CG14950.

The disposal (or part-disposal) of the right will not be eligible for any relief which was due (or claimed) on the disposal of the original asset.


A company sells business premises for consideration consisting of cash plus a right to unascertainable future consideration. It acquires replacement premises and claims roll-over relief under TCGA92/S152, see CG60250+.

Roll-over relief will not be available to the company on the later disposal of the right. The right is not a qualifying asset for rollover relief purposes, see CG60410.

Top of page


An individual disposes of a business for consideration which includes a right to unascertainable future consideration. The disposal qualifies for Entrepreneurs Relief under TCGA92/S169H, see CG63950+.

The later disposal of the right will not qualify for further relief.

Where however, the right was acquired on a sale of shares or debentures TCGA92/S138A may result in TCGA92/S135 operating so that the no disposal/same asset treatment of TCGA92/S127 applies, with the necessary adaptations, to the exchange of the shares or debentures for the right. There is guidance on TCGA92/S138A at CG15020 and CG58000+ and on TCGA92/S135 at CG52500+.