Section 32AB of the Income-tax Act, 1961, provides for a deduction in respect of deposits made in an investment deposit account. This section allows an assessee engaged in the business or profession to claim a deduction of a specified percentage of profits derived from the business, provided the amount is deposited in an account with the Development Bank or utilized for the purchase of new machinery or plant. The deduction is available for the assessment years 1987-88 to 1990-91. The statutory test requires the assessee to deposit the amount before the due date of filing the return of income. The burden of proof lies on the assessee to demonstrate compliance with the conditions of the section. This provision is significant as it incentivizes reinvestment into the business, promoting growth and modernization.