Add a shift
hours
miles
$
$
$
Your rates (what a mile costs, and your taxes)
$
$
%
Your own estimate of the rate on your last dollar earned.The app shows you a payout. The car and the taxes show up later. Log each shift and see what is left.
These are example shifts with illustrative figures. They are not saved. Add a shift of your own and they are replaced by your log.
Your log is kept in this browser on this device, and nowhere else. Clearing your browser's data deletes it, so download the spreadsheet now and then as your backup. It also gives you the mileage record to hand to whoever does your taxes.
The formulas are G1 on the formulas page.