Purchase Bill Entered with Wrong Tax – GST Already Filed

A purchase bill was recorded with 18% GST instead of 12%. GST return has already been filed.

Since GST is already filed:

Option 1 (If within amendment window):

  • Issue Debit/Credit Note for tax difference

Option 2 (If period closed):

  • Pass adjustment entry in current period

  • Disclose difference in next GST return

Never edit original bill after filing.