Allow me to share some insight into why mileage expenses do not appear in the Profit and Loss report in QuickBooks Self-Employed (QBSE), AS123.
Mileage expenses are not included in the Profit & Loss report because this report only reflects income and expenses. Mileage is considered as deductible expense, tracked separately in QuickBooks Self-Employed under the Miles section. You can open the Mileage log report to view mileage data. Here's how:
Go to the Reports menu and find the Mileage log.
Choose appropriate year.
Then, click View or click the drop-down arrow to download.