Keeping a logbook is either ordered by the traffic authority or may be required for tax reasons.

Following an infringement of traffic regulations, the traffic authority may require you to keep a logbook if the driver responsible cannot be identified.
In this case, the following details must be kept:

• Surname, first name and address of the driver,
• Registration number of the vehicle,
• Date and time of the start and end of the journey,
• Signature of the driver.

In tax matters, the following must be recorded separately, continuously, promptly and in closed form to determine the non-cash benefit when using a company vehicle for private journeys:

• in the case of business-related away-from-home activities:
  • Date and mileage at the beginning and end of each individual business/work-related journey,
  • destination and, in the case of detours, the route taken,
  • purpose of the journey and business partners visited.
• For private trips: details of the kilometers driven,
• for journeys between home and place of work: brief note in the logbook.