9.—(1) This paragraph applies only where the net income of a self-employed earner is calculated or estimated under paragraph 8.
(2) Where—
(a)a non-resident parent has been a self-employed earner for 52 weeks or more, including the relevant week, the amount of his net weekly income shall be determined by reference to the average of the earnings which he has received in the 52 weeks ending with the relevant week; or
(b)a non-resident parent has been a self-employed earner for a period of less than 52 weeks including the relevant week, the amount of his net weekly income shall be determined by reference to the average of the earnings which he has received during that period.
(3) Where a calculation would, but for this sub-paragraph, produce an amount which, in the opinion of the Department, does not accurately reflect the normal weekly income of the non-resident parent in question, such earnings, or any part of them, shall be calculated by reference to such other period as may, in the particular case, enable the normal weekly earnings of the non-resident parent to be determined more accurately and for this purpose the Department shall have regard to—
(a)the earnings from self-employment received, or due to be received, by him; and
(b)the duration and pattern, or the expected duration and pattern, of any self-employment of that non-resident parent.
(4) Where a person has claimed, or has been paid, working families' tax credit or disabled person’s tax credit on any day during the period beginning not earlier than 8 weeks before the relevant week and ending not later than the date on which the calculation is made, the Department may have regard to the amount of earnings taken into account in determining entitlement to those tax credits in order to calculate or estimate the amount of earnings to be taken into account for the purposes of calculating net income, notwithstanding the fact that entitlement to those tax credits may have been determined by reference to earnings attributable to a period other than that specified in sub-paragraph (2).