A mileage log serves as evidence in the event of an audit. According to the Swedish Tax Authority, you as a driver and the company are responsible for proving that the car has been used correctly.
Without a mileage logbook, you risk being taxed on benefits up to five years retroactively, even if you have followed the rules. With Dina Mil, you can clearly distinguish which trips are private and which are for business purposes. This reduces the risk of disputes.