Hi everybody there,
Overtime calculation:
For the regular employee of the company:
((Basic+Da)/No. of days of the particular month/No. of working hours of shift)*2*No. of Hrs of OT done=
Overtime amount for that employee. e.i ((2500+461)/31/

*2*16 hrs=Rs. 395/-
For the contractor employee:
((Basic+Da)/26 days that is standard/No. of working hours of shift)*2*No. of Hrs of OT done=
Overtime amount for that employee. e.i ((2500)/26/

*2*16 hrs=Rs. 385/-
Please note Overtime attracts ESI only, not PF but regarding PTax I am not aware.
I think I have made myself clear to your doubt.