Share of member income from association: taxable in member's hands unless association's income is taxed at maximum rate. A member is not separately taxable on his computed share of an association's income except where specified. If the association has no tax liability on its total income, the member's computed share is chargeable as part of his total income. If the association is taxed on its total income at the maximum marginal rate or a higher rate, the member's computed share is excluded from his total income; in other cases the computed share forms part of the member's total income.