908Royalty payments etc made through UK resident agentsU.K.
(1)If—
(a)a payment to which section 906 applies is made through an agent who is UK resident, and
(b)the agent is entitled as against the owner of the right to deduct a sum as commission for services provided,
section 906(5) and Chapters 8 (deduction at special rates), 15 and 16 (collection) apply as if the amount of the payment were the amount net of the sum deductible as commission.
(2)But if the person by or through whom the payment is made does not know the commission is payable, or does not know its amount—
(a)the sum representing income tax required to be deducted under section 906 must be calculated in the first instance on the total amount of the payment, and
(b)the return to be made under Chapter 15 or the account of the payment under Chapter 16, must be based on that total amount.