Madam,
CTC means all the total components of the salary package: basic, HRA, conveyance, special allowance, PF, LTA, Medical, Incentive, Gratuity, Medical Insurance, and more.
ESI Contribution will be calculated on the Gross salary only. Gross salary refers to all the total earnings based on the working days in the current month. The gross salary formula is as follows: Basic + VDA + HRA + Conveyance + any special allowance only. For ESI calculation, the Gross salary will consider all components. If the total earnings are 10,000 and below, then the staff/worker is covered under ESI. If the gross salary exceeds 10,000, ESI will not be applicable.
If a staff member is covered under ESI, then overtime and incentives will also have ESI contribution deductions.