Some transactions have components that do not include GST.
Some examples might be insurance premiums (stamp duty does not attract GST) or grocery purchases (certain food items do not attract GST).
To achieve the correct GST amount, either enter the taxable and non-taxable components separately with different Tax Codes. See Add Taxable & Non Taxable Components.
Or enter the entire amount as GST and use the Tax Components button to manually override the calculated GST. See Manually Adjust GST. Note that this will result in the GST Input Credits not being equal to 1/11th of the taxable purchases; if this an issue (if you process your BAS via the ECI) manually adjust the taxable purchases value to equal 11 x the Input Credit total.
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