Wrong gst rate charged in invoice

Originally posted by : ashish
	What should we do, we have charge wrong tax rate in invoice 12%, which is suppose to be charge 5 %

You may issue a credit note for the difference as the tax charged in the invoice exceeds the tax payable on the supply.

Mr. Deepak Gupta is correct.

To elaborate,
Correct the entry in Books as per GSTR 1 information (incorrect information submitted).
Additionally, in subsequent return period, 
    In GSTR 1, include the difference amount as credit note, so that, both Sales and Credit note transaction will be correct
    Now, correct your net amount in GSTR 3B of subsequent period

You can change this bill in your GSTR 1