If you use this method your claim is based on the business use percentage of each car expense.
You need to keep:
> a logbook to calculate the business use percentage
> odometer readings for the start and end of the period you owned or leased the car, and
> written evidence for all car expenses, except for fuel and oil costs.
Your logbook is valid for five years. The logbook must cover at least 12 continuous weeks.
If you started to use your car for business purposes less than 12 weeks before the end of the financial year, you are able to continue to keep a logbook into the next financial year so that your logbook covers the required 12 weeks. If you want to use the logbook method for two or more cars, the logbook for each car must cover the same period.
Your logbook must contain the following information:
> when the logbook period begins and ends
> the car’s odometer readings at the start and end of the logbook period
> the total number of kilometres that the car travelled during the logbook period
> the number of kilometres travelled for work activities based on journeys recorded in the logbook. If you make two or more in a row on the same day, they can be recorded as a single journey, and
> the business use percentage for the logbook period.