You need to log each business journey for a continuous 12-week period which is representative of your annual business kilometres travelled.

Record the odometer reading in your car on the first day of the 12-week period.

Each day, record every business journey during the 12-weeks showing the odometer reading when you start your ride-share work and the odometer reading when you finish your ride-sharing work.

Record the odometer reading in your car on the last day of the 12-week period.

Congratulations! You can now determine your business-use percentage and keep it for the next five years.