Dear Sujan,
While designing payroll, you should keep these components in mind:
1- Basic (40% to 60% of gross)
2- HRA (40% to 60% of Basic)
3- Conveyance allowance (up to 800 is tax exempted)
4- Medical reimbursement (up to 1250 is tax exempted)
5- Education allowance
6- Special allowance {Gross - (1 + 2 + 3 + 4 + 5)}
7- Gross (1 + 2 + 3 + 4 + 5 + 6)
8- PF (if applicable)
9- ESI (if applicable)
10- PT (if applicable)
11- Other deductions
12- Net take-home {Gross - (8 + 9 + 10 + 11)}
13- Bonus/Ex gratia
14- LTA
15- CTC [Gross + (PF + ESI + Bonus + LTA)]
You can also have other components in gross like petrol reimbursement, meal coupon, etc.
Regards,
Bandini.