How to keep a mileage log

Trips are entered as odometer readings, so the month has to reconcile. That is exactly what an inspector recomputes.

Steps

Add your vehicles

Registration and description. The whole fleet can be pasted from a spreadsheet under “Uvoz”.
Record readings, not distances

For each trip enter the odometer at departure and arrival, the route and the purpose, and whether it was business or private. Consecutive entries then have to agree with each other.
Watch the unexplained kilometres

The vehicle screen leads with the gap between how far the odometer moved and how far the log accounts for. A month where the odometer moved 900 km and the log explains 750 has 150 km nobody can justify.
Close the period

The business share is derived from recorded trips rather than estimated. A vehicle with no trips can be removed; after its first trip it stays, because it is then part of the log.

Mileage log per vehicle and period: Every trip with odometer readings, route and purpose.
Business share: The basis for benefit in kind: 1 % of the purchase value per month, or 20 % of the operating lease instalment.

Croatian income tax ordinance — private use of a company vehicle is established from the log, and assessed at a flat rate without one.