(1) In this Chapter -
"accountable person" has the meaning assigned to it by section 521;
"appropriate tax", in relation to a relevant payment, means - (a) where such payment does not include value-added tax, a sum representing income tax on the amount of that payment at the standard rate in force at the time of payment, and (b) where such payment includes value-added tax, a sum representing income tax at the standard rate in force at the time of payment on the amount of that payment exclusive of the value-added tax;
"authorised insurer" has the same meaning as in section 470;
"basis period for a year of assessment", in relation to a specified person, means - (a) where a relevant payment is to be included in a computation of profits or gains of that person for the purposes of Case I or II of Schedule D, the period on the profits or gains of which income tax for that year is to be finally computed for the purposes of Case I or II of Schedule D, and - (i) where 2 basis period
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