How to get refund under GST

[THYAGARAJAN KALYANASUNDARAM]

Dear experts,

One of my client had supplied and installed software to the customer and billed in the month of Dec 2016 , Feb and March 2017. When we approach the payment now from the customer it was not accounted in the previous year. Now they are asking them to issue GST invoice . If my client issue GST invoice with GST tax now , then this will be double taxation on same goods. How to get refund from the earlier tax remittance. Is there any way out of getting refund from the government.

It's very urgent. Thanks in advance

AI Summary

GST invoice issuance for pre GST supplies is not permissible; seek manual refund or use duplicate invoices to recover payment.
Supplies billed before GST commenced cannot be re invoiced under GST; parties should rely on duplicate pre GST invoices to claim payment. Alternatively, a manual refund application may be submitted to the jurisdictional Assistant/Deputy Commissioner, with reliance on the pre GST definition of service to argue that those historical supplies were outside the taxable service ambit and not properly subject to GST invoicing.