Provided that, where the total income of any member of such association or body is chargeable to tax at a rate which is higher than the maximum marginal rate, tax shall be charged on the total income of the association or body at such higher rate.

(2)  Where, in the case of an association of persons or body of individuals as aforesaid [not being a case falling under sub-section (1)],—

 (i) the total income of any member thereof for the previous year (excluding his share from such association or body) exceeds the maximum amount which is not chargeable to tax in the case of that member under the Finance Act of the relevant year, tax shall be charged on the total income of the association or body at the maximum marginal rate;

(ii) any member or members thereof is or are chargeable to tax at a rate or rates which is or are higher than the maximum marginal rate, tax shall be charged on that portion or portions of the total income of the association or body which is or are relatable to the share or shares of such member or members at such higher rate or rates, as the case may be, and the balance of the total income of the association or body shall be taxed at the maximum marginal rate.

Explanation.—For the purposes of this section, the individual shares of the members of an association of persons or body of individuals in the whole or any part of the income of such association or body shall be deemed to be indeterminate or unknown if such shares (in relation to the whole or any part of such income) are indeterminate or unknown on the date of formation of such association or body or at any time thereafter.