In Australia a business can only claim the percentage of vehicle use costs which are estimated to be business travel. The percentage based on a log book which has to be intermittently redone.
This percentage deduction could be done
When every expense is entered into Manager. Which is labor intensive without Manager support
Via an adjustment your accountant does at the end of each financial year. But that means Managers records are wrong most of the time.
For a sole trader another way is to create a “Motor Vehicle” expense group with the following accounts
Create a “Profit and Loss report” with periods corresponding to the financial reporting intervals eg BAS quarters
Post 100% of actual vehicle expenses to “Motor vehicle expenses” (with a GST 10% tax code) and 100% of stamp duty to “Motor Vehicle stamp duty” (with a tax code of GST Free)
Then at the end of the reporting period / BAS quarter, open the above profit and loss report in one window
In another window, go to your journal entries tab and search for “Motor vehicle”
View the journal entry for the last quarter / the most recent motor vehicle private use adjustment
And clone it
Note in this example Private motor vehicle use is 44% ie Total x 0.44
Edit the journal entry for the quarter being processed by
Date to the end of the current quarter
Copy from the Profit and loss report for the quarter just ended, into the journal entry Narration the “Motor vehicle expense” and the “Motor Vehicle stamp duty”
Copy from the Narration the GST 10% private vehicle use to the first line item
Copy from the narration the GST free private vehicle use (stamp duty) to the second line item
Copy from the narration the sum of both to the third line item
Now vehicle expenses for the year and each quarter are accurate.
“Tax liability” shown in the “Tax Summary” report is accurate
Unfortunately you can not use the other figures directly in the “Tax Summary” and “GST Worksheet” as the Motor vehicle expense correction is reported as a Sale by Manager, artificially inflating the reported G1 (total sales) an issue particularly important at the moment with JobKeeper cost auditing likely. See Inconsistency in Tax-reporting - #20 by Patch