Investment deposit account deduction permits deduction for approved deposits or asset purchases subject to audit and clawback rules. Statutory provision creates an Investment Deposit Account deduction allowing an assessee in an eligible business to deduct amounts deposited with the designated Development Bank or amounts used to purchase specified new assets under an approved scheme, limited to the lesser of such amounts and twenty per cent of profits of the eligible business as computed in audited accounts. The deduction requires an accountant's audit report filed with the return. Unutilised released deposits and portions of asset cost linked to prior deductions on disposals within eight years are deemed business income.