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

HMRC internal manual

Company Taxation Manual

ACT: set-off against CT on profits: excessive set-off

Where it was discovered that an excessive amount of ACT has been set-off, the excess had to be recovered. A further assessment to CT was raised on the profits against the tax on which the excessive set-off had been made, (ICTA88/S252).

Normal time limits applied to such assessments except where TMA70/S36 applied (see EM3905), and TMA70/S42 (10) had also to be considered when an assessment was necessary because of a claim.