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

HMRC internal manual

Oil Taxation Manual

PRT: Supplementary Petroleum Duty - Background

APRT was preceded by Supplementary Petroleum Duty (SPD). For the calendar years 1981 and 1982 SPD was levied as a separate tax computed under FA81\S122 to FA81\S128 and FA81\SCH16. The computation was similar to that for APRT but SPD was not an advance payment of PRT and not creditable against PRT due. Instead it was deductible in computing assessable profits for both PRT and CT.

The legislation was repealed by FA82\SCH22.