Discrepancy in salary due to a communication gap, salary calculated as 21001 gross with no ESIC deducted

Hi All, One of our staff decided his salary was 21000 in hand but due to a communication gap, it was calculated as 21001 gross with no ESIC deducted and he has worked for 11 days. How do we calculate the difference amount on this salary? Please help.

What is the issue? Is the issue with ESI not being deducted? Since his salary exceeded Rs 21000, there is no need to contribute ESI. For this his actual earning for 11 days may be ignored and you can take his notional wages, the wages/ salary that he would have earned had he worked for the entire 30/31 days in the month.