Which type of tax saw a continuous reduction in rates since 1991 in India?

Direct taxes

Corporate taxes are part of direct taxes.

Since 1991, there has been a continuous reduction in the taxes on individual incomes as it was felt that high rates of income tax were an important reason for tax evasion. It is now widely accepted that moderate rates of income tax encourage savings and voluntary disclosure of income. The rate of corporation tax, which was very high earlier, has been gradually reduced.