We got a project to make a corporate film in June. We receieved 50% advance in June. We started the project in July. We were not registered for GST as ours is a new firm. The project is inter-state. The project is still going on. We have received further 25% on 4th of August. We had issued Pro-Forma invoice for both the payments without adding GST, but had told them that we will charge GST once we get GSTIN.
We just received GSTIN today. We'll soon issue them with the GST invoice. But we have already received 75% of the payment. Should we write on the invoice about advance received? And when will the return be due? Will it be due on 10th September? Or do we have a file a areturn by tomorrow as we have just received out GST today and it is 9th, regarding the payment received in June. There is a lot of confusion regarding that.
Please help in this regard! Thanks.