In India, the applicability of Provident Fund (PF) contributions and Professional Tax (Ptax) on incentives largely depends on the nature of the incentive and the specific laws of the state in question.
1. Provident Fund Contributions: According to the Employees' Provident Fund and Miscellaneous Provisions Act, 1952, PF contributions are applicable on basic wages, dearness allowance, and retaining allowance (if any). However, the Supreme Court of India in a landmark judgment in 2019 expanded the definition of 'basic wages' to include all allowances that are universally, necessarily and ordinarily paid to all employees. Therefore, if the quarterly incentives are a fixed part of the salary and are paid universally, necessarily and ordinarily to all employees, they may be considered for PF contributions.
2. Professional Tax: Professional Tax is a state-level tax and its applicability varies from state to state. In West Bengal, according to the West Bengal State Tax on Professions, Trades, Callings and Employments Act, 1979, Ptax is applicable on 'salary or wage earners'. The Act does not specifically mention incentives. However, if the incentives form a regular part of the salary, they may be considered for Ptax.
It's recommended to consult with a local HR expert or legal advisor to understand the specific implications in your case. Also, the company should ensure compliance with all relevant laws to avoid any legal complications.