The invoice referred to in rule 46, in the case of the taxable supply of services, shall be issued within a period of thirty 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 non-banking financial company, the period within which the invoice or any document in lieu thereof is to be issued shall be forty five days from the date of the supply of service:
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