If you've filed your GSTR3B and paid the tax but forgot to include the interest payment, you can still pay it in your next GST return. It's advisable to pay the interest promptly to avoid future notices. Keep records of all interest payments for your reference.
12 January 2024
Dear Sir For October'23 month Invoice I have filed GST return in the month of December'23 paid tax also. But I forgot to pay Interest. Can I pay interest in the month of January'24 GST return. Please advise me sir