residual expenditure "residual expenditure" at any date in relation to an asset in respect of which qualifying capital expenditure has been incurred by a unit trust shall be the total qualifying capital expenditure incurred on the provision of the asset before that date reduced by the allowance falling to be made in relation to that asset for any year of assessment before that date. ACT 53 - INCOME TAX ACT 1967 63A. Special deduction for qualifying capital expenditure.