Noramy way is based upon April month salary; tax will be worked out for the whole year. Normal exemption, i.e., ceiling is 1.00 lakh, will be passed on with a declaration from the employee or based on previous year investments (LIC, medical policy, etc.). Tax worked will be deducted in equal monthly installments. Every quarter, a review will be done. At the end of December, all employees will be advised of their tax liability and given a cutoff time to submit proof or further information on their investments. Failing which the company will proceed with their working, and tax will be deducted. It is the responsibility of the Accounts department, and HR is only a negotiator between accounts and employees. If an employee feels that more TDS has been recovered, it is his responsibility to file a return to get a refund from the IT department. The company can issue only a tax recovery cum deposit proof (FORM 16).
Hope things are clear.