1. Either at the time of payment thereof in cash or issue of a cheque or draft or by any other mode, or;
   
   

2. At the time of credit of Interest to the account of the payee or to interest payable account or suspense account. Which ever is earlier.

Liability has to be disbursed by following time span

Type of Deductor	Period of payment
Tax deducted by or on behalf of the Government	The same day without any production of challan form
Amount credited by a person to the account of payee as on the date up to which the accounts of such person are made	Within two months from the end of the month in which such date falls
In any other case	Within one week from the last day of the month in which deduction is made