Income tax

Ha yes but before due date of it filing

Plz provide sec details or case laws
as in my knowledge employees contribution is addwd back in income u/s 2(24) & 36(1)(va)

Yes, allowed

Yes allowed as deduction if payment made on or before the due date of filing of return us 139 but in case of esi if payment made after due date then it can not be claimed deduction because in this case the benefit of date of filing of return is not available and if u claimed deduction then ito raised demand with respect to that amount