Rates op Tax and Contribution by Reference to an Average Income.

In the case of a taxpayer to whose income Division 16 of Part III. of the Assessment Act applies, the rates of income tax and social services contribution are -

(a)   for every £1 of so much of the taxable income as does not exceed Four thousand pounds -

(i)   the rate ascertained by applying the rates set forth in the First Schedule to a taxable income equal to his average income and dividing the resultant amount by a number equal to the number of whole pounds in that average income; or

(ii)   71.775 pence, whichever is the less; and

(b)   for every £1 of the remainder of the taxable income, the rate ascertained by deducting the amount of One thousand one hundred and ninety-six pounds five shillings from the tax and contribution which would be payable if the rates set forth in the First Schedule were applied to the total taxable income and dividing the resultant amount by a number equal to the number of whole pounds in that remainder.