deduction for the period of seven assessment years immediately succeeding the initial assessment year. Subsection (6) deals with computing the deduction under subsection (1) and it starts with non obstante clause and also it is a deeming provision. The fiction created by the undertaking was the only source of income during the previous year initially and subsequent assessment years. Sub-section (6) was the subject-matter before this court in the above-mentioned unreported judgment, wherein this court had held that while interpreting the above provision, for the purpose of allowing deduction under section 80-I brought forward losses and unabsorbed depreciation of the new industry need not be taken into consideration once they have been set off from other sources of income earlier. In the present case, we are concerned with the provision of section 80-IA. The said provision was introduced by the Finance Act, 1999, with effect from April 1, 2000. The provisions of sections 80I and 80-IA are also more or less identically worded. Sections 80-I and 80-IA come in Chapter VI-A of the Income-tax Act. Chapter VI-A deals with deductions to be made in computing total income. There are two tax incentives contemplated in Chapter VI-A. One is investment incentive and the other one is profit-linked investment. Chapter VI-A was introduced by the Finance Act, 1965, with effect from April 1, 1965, and it consists of four headings. They are A, B, C and D. Heading "A" is general and it also contains definition. It consists of sections 80A, 80AA, 80AB, 80AC and 80B. Section 80AB deals with "Deductions to be made with reference to the income included in the gross total income", which reads as follows :
