If you missed filing two GST bills (one B2B, one B2C) in April 2019, you can include them in your May 2020 GSTR 1 and GSTR 3B returns. Be aware that an interest of 18% will be applicable on the payment for these missed bills.
When Gst returns filed in the month of April 2019 by mistakely missed two bills(one bill B2b and other B2c), Now we are finalizing accounts it is found , payment to be done against that bills.
Can I show this two bills in may 2020 Gstr 1 and GSTR3B returns, and What Rate of Interest applicable for payment or other any option.