Gratuity Payment Methods
You can do it both ways. See this.
For every completed year of service or part thereof in excess of 6 months, the employer shall pay gratuity to an employee at the rate of 15 days' wages based on the rate of wages last drawn by the employee concerned.
Calculation of Gratuity
According to the explanation under section 4(2), if the wages are paid monthly, then the per day wage for the purpose of calculating gratuity will be calculated as follows:
Salary/Wages for Gratuity = Rate of Monthly Wage Last Drawn * 15 / 26
In the case of an employee paid on a piece-rate basis, daily wages are computed as the average of total wages received in a period of 3 months immediately preceding the date of termination. For this purpose, the wages paid for any overtime work shall not be taken into account.
For an employee employed in a seasonal establishment and not employed throughout the year, the employer shall pay the gratuity at the rate of seven days' wages for each season.
The amount of gratuity payable to an employee shall not exceed ten lakh rupees.
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