how to calculate individual income tax

means how you want to compute? , as in individual there are normal individuals, senior Citizen and Very senior citizen.

Normal GTI Format:

Income from salaries    XXXXXXXX

Income from HP           XXXXXXXX

PGBP Income              XXXXXXXX

CG Income                  XXXXXXXX

Other Sources             XXXXXXXX

Total Income               XXXXXXXX

C/Y and B/F loss        (XXXXXXXX)

GTI                             XXXXXXXX

VIA Deductions          (XXXXXXXX)

Taxable Income         XXXXXXXX

NOW Calculate tax as per applicable slab rate on this taxable income.