Circular No.240 – Income Tax The rates of income-tax for the assessment year 1978-79 in the case of all categories of taxpayers (corporate as well as non-corporate) are specified in Part I of the Schedule to the Finance Act, 1978. These rates are the same as those specified in Part III of the First Schedule to the Finance (No. 2) Act, 1977 for the purposes of computation of advance tax; deduction of tax at source