1. Please ensure that the difference of Rs. 1000/- (16000-15000) as per the example mentioned by you is not considered Overtime. Overtime contribution is required to be paid even if the total wages exceed Rs. 15000/-.
2. If the amount of Rs. 16000/- is exactly the "wages" without any element of Overtime, then the employer should not include such an employee under the ESI Act, 1948 right from the first month of the next contribution period (from which wages exceeded the coverable limit).
3. Even if the employer deducts the contribution and categorizes the employee as covered under the said Act, making them eligible for benefits, it would be an erroneous coverage of an employee. In the event of any wrongful benefit payment, including medical benefits, it would constitute a false statement by the employer and could lead to prosecution under section 84 of the Act. Kindly refer to the Act to understand the extent of such punishment.