by calculating or estimating the amount which is likely to be his average weekly income in accordance with this Part;

by adding to that amount the weekly income calculated under regulation 29(2);

by then deducting any relevant child care charges to which regulation 31 (treatment of child care charges) applies from any earnings which form part of the average weekly income or, in a case where the conditions in paragraph (2) are met, from those earnings plus whichever credit specified in sub-paragraph (b) of that paragraph is appropriate, up to a maximum deduction in respect of the claimant's family of whichever of the sums specified in paragraph (3) applies in his case.

the claimant's earnings which form part of his average weekly income are less than the lower of either his relevant child care charges or whichever of the deductions specified in paragraph (3) otherwise applies in his case; and

that claimant or, if he is a member of a couple either the claimant or his partner, is in receipt of working tax credit or child tax credit.

where the claimant's family includes only one child in respect of whom relevant child care charges are paid, £175.00 per week;

where the claimant's family includes more than one child in respect of whom relevant child care charges are paid, £300 per week.