Entitlement to writing-down allowancesU.K.
94(1)A writing-down allowance is made for a chargeable period in respect of an item of qualifying expenditure if—
(a)the chargeable period falls wholly or partly within the writing-down period for that expenditure (as determined in accordance with paragraph 95),
(b)paragraph 97 does not prohibit writing-down allowances for that period, and
(c)either—
(i)the trade use condition is met for that period, or
(ii)any income receivable by that person in respect of the patent rights in that period would be liable to tax.
(2)The trade use condition is that—
(a)the person is carrying on in the chargeable period a trade which is within the charge to tax, and
(b)at any time in the chargeable period the patent rights, or other rights out of which they were granted, were, or were to be, used for the purposes of the trade.
(3)The total writing-down allowances made in respect of an item of qualifying expenditure (whether to the same or to different persons) must not exceed the amount of that expenditure.