F1 Part 4A FLAT CONVERSION ALLOWANCES
Chapter 6 WRITING-DOWN ALLOWANCES
393K Amount of allowance
(1)
The writing-down allowance for a chargeable period is 25% of the qualifying expenditure.
(2)
The allowance is proportionately increased or reduced if the chargeable period is more or less than a year.
(3)
The amount of the writing-down allowance for a chargeable period is limited to the residue of qualifying expenditure.
(4)
For this purpose the residue is ascertained immediately before writing off the writing-down allowance at the end of the chargeable period.