Tax invoice

In the case supply of services, Invoice shall be issued within a period of 30 days from the date of the supply of service:

Provided that where the supplier of services is an insurer or a banking company or a financial institution, including a NBFC, the period within which the invoice or any document in lieu thereof is to be issued shall be 45 days from the date of the supply of service.

For this read section 13(1) for normal services section 13(2 )for payment of service where payment is not decided or where things aren't known 13(3) for rcm covered services