If a transaction includes GST but is also coded to the GST account, it may double-count in the P&L.
For example:
You enter a bank fee of $123.96 incl. GST
It’s posted gross to the Bank Fees GL
GST portion $11.27 is also captured under the GST Paid GL
Result: The $11.27 appears twice — once as part of the expense and once in the GST ledger.
✅ Solution:
Code the net amount ($112.69) to the expense GL
Code only the GST to the GST Paid GL