Regulation 31 Accounting periodsI1 United Kingdom The accounting periods for plastic packaging tax are the three-month periods ending with 31st March, 30th June, 30th September and 31st December. Annotations Commencement I1 Reg. 31 in force at 1.4.2022, see reg. 1 ← Regulation 30 Regulation 31 Regulation 32 →