(1) Where a self-employed contributor receives payments of emoluments only for any contribution year and he has paid self-employment contributions of an amount not less than that which he is liable to pay under section 18(1) (c) he shall be regarded as having paid self-employment contributions for each contribution week in that contribution year.

(2) Where the contributions paid by a self-employed contributor is less than the amount which, under section 18(1) (c) and these Regulations, he is liable to pay in any contribution year, no contribution shall be regarded as having been paid by the self-employed contributor in respect of any week in that contribution year.