Taxation of AOPs/BOIs: unknown member shares trigger top personal rates on aggregate income; known shares require apportioned taxation.
Where members' shares in an AOP/BOI are indeterminate or unknown, the entity's total income is taxed at the maximum marginal rate or at any higher rate applicable to a member's total income; where shares are determinate, each member's other income is tested against the Finance Act's non taxable threshold and portions attributable to higher rate members are taxed at those rates while the balance is taxed at the maximum marginal rate, with a deeming rule treating indeterminacy at formation or thereafter as sufficient.