The GST field will always default to 10% of the total. However, the GST amount can be edited if GST for an expense does not equate to 10% of the total.
NOTE: If you are registered for GST and want to on-charge an expense to a client, it's best to create 2 records. One is for the GST-inclusive items, and one is for the GST-exclusive items. That way, they will appear correctly on your invoice according to the ATO's invoice compliance requirements.
How to edit the GST amount in an expense record
1. Go to the main Expense page by clicking Deductions, then Expenses
2. Add or open the record where GST needs to be amended and edit the GST
accordingly
3. Click Save
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