If you're making a sale, even if payment is delayed by two months, you must generate a tax invoice under GST regulations. This applies whether the sale is within your state or to another state. The law mandates issuing a tax invoice for any supply of goods or services, regardless of when the payment is received.
11 June 2020
According to the Provisions of GST, a registered person is making or receiving supplies (from unregistered persons), then a tax invoice needs to be issued by such registered person. Hence, You mandatory issue tax invoice while made a supply of goods and/or services.