If you mistakenly forgot to raise a bill for a payment received last year, you can still issue it now. Since GST wasn't paid on advances for goods at that time, raising the bill now should not cause negative GST implications. It's advisable to book the payment as an advance and then raise the invoice.
18 August 2023
This bill was against goods. Usually we take advances from the client to start with our work, but gst is filed only during raising bill. Now the bill was suppose to raise in last year, but bymistkenly we skipped it. Can we raise it now? Will it negatively affect gst?
20 August 2023
For the supply of goods advance received is not subject to GST. The entire amount will be taxed on the issue of the invoice (w.e.f. 15th November 2017).