Hi Jennifer71,
Thanks for the detailed breakdown, sounds like you've already done a lot of the right checks. If the accrual reports still match your BAS but a GST balance has appeared on the cash balance sheet, it's likely how one of those credit notes was applied, especially since it relates to an opening balance transaction. Credit notes applied to historical or non-standard purchases can behave differently under cash reporting, triggering unexpected GST movements. You can also visit this help pages that will give you more information about this.
Goods and Services Tax (GST): What is it and how to calculate it
GST/Tax reports
Creating purchase returns and debits
You can also reach out to our team so they can dig deeper into this. You can reach them on Live Chat via our virtual assistant, MOCA or by submitting a support case via MyAccount.
Regards,
Earl