Circular No.138 – Income Tax The rates of income-tax for the assessment year 1974-75 in the case of all categories of taxpayers (corporate as well as non-corporate) are specified in Part I of the First Schedule to the Finance Act, 1974. These rates are the same as those specified in Part III of the First Schedule to the Finance Act, 1973 for purposes of computation of ýÿadvance taxýÿ, deduction of tax at source from