CH51700 | Assessing Time Limits: The Time Limits: What is the relevant tax period?
From HM Revenue & Customs · Compliance Handbook
The relevant tax period is
a year of assessment
an accounting period for corporation tax, aggregates levy and climate change levy
a prescribed accounting period
the date of importation or acquisition, see below,
the date of an event giving rise to a VAT penalty, see below,
the relevant event for insurance premium tax and landfill tax
the effective date of the transaction for stamp duty land tax
the later of (1) the date on which the last payment was made and accepted and (2) the date on which the tax became due for inheritance tax
the accountable date for stamp duty reserve tax
the relevant chargeable period for petroleum revenue tax
the period or point in time when the liability arose for excise duty.
Importation or acquisition (VAT)
A person may be liable to VAT on
any goods imported into the UK from countries outside the EU, and
any goods acquired in the UK from another EU member state that are
subject to excise duty, or
consist of a new means of transport.
The date of importation (goods in 1 above) or acquisition (goods in 2 above) will determine the relevant tax period for the purposes of determining the time limit for assessing.
For importations and acquisitions made by non-taxable persons the relevant tax period will be a single day. A non-taxable person is an individual who is neither registered nor required to be registered for VAT.
VAT penalties
Where the assessment is of a VAT penalty listed at CH51250, other than one in relation to the mandatory e-filing of VAT returns, the relevant tax period for the purposes of determining the time limit for assessing is the date of the event giving rise to the penalty.