Hi,
For payroll india, income tax base is your annual income . From the annual income and considering exemptions ( declarations, medical exemption, CEA,CHA, HRA, Convayance ec ) arrive at a annual income tax , and the annual amount will be divided in to no of months and deduct every month.
If you change any declaration ( more or less ) the annual income tax also change and per month income tax also will change. There is no retro wage type for income tax .
/552 is summary of changes made on pay components in this current period with effect from previous period/periods.
Regards
Sujith