Section 686 | Payments received after deduction of tax
From legislation.gov.uk
(1)In accordance with section 848 of ITA 2007, a sum representing income tax deducted under Chapter 6 of Part 15 of that Act from an annual payment within this Chapter is treated as income tax paid by the recipient . . .
(2)See also section 494(3) of ITA 2007(sum treated as deducted from payments made under a discretionary trust treated as income tax paid by the person to whom the payment is made or the settlor).