472Amount of allowances and charges
(1)The amount of the writing-down allowance to which a person is entitled for a chargeable period is 25% of the amount by which AQE exceeds TDR.
(2)If the chargeable period is more or less than a year, the amount is proportionately increased or reduced.
(3)If in the case of qualifying trade expenditure the trade has been carried on for part only of the chargeable period, the amount is proportionately reduced.
(4)A person claiming a writing-down allowance may require the allowance to be reduced to a specified amount.
(5)The amount of the balancing charge to which a person is liable for a chargeable period is the amount by which TDR exceeds AQE.
(6)The amount of the balancing allowance to which a person is entitled for the final chargeable period is the amount by which AQE exceeds TDR.