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Mileage log requirements

What a mileage log in Switzerland must contain

The tax authority must be able to see from the mileage log how many kilometres were driven for business and how many privately. Here is what is mandatory, what Kilometra does for you and what you need to take care of yourself.

Who needs a mileage log?

If you declare the private share of your company car as a flat rate, you don't need one: 0.9 % of the purchase price per month, at least CHF 150.

You need a mileage log if you want to declare the private kilometres actually driven instead, or if you use a private car for business and must prove those kilometres. The calculator in the app shows you whether it pays off.

What the tax authority requires

Once a year

  • •Driver
  • •Calendar year
  • •Odometer reading on 1 January and 31 December

For every trip, on the day of the trip

  • •Date
  • •Person or company visited, with location (e.g. "X Ltd, Rümlang")
  • •Kilometres driven

Form

  • •Kept daily, completely and without gaps
  • •Fixed form, no loose sheets
  • •Electronic mileage log: later changes are documented

Not mandatory

  • •Time and exact reason are welcome but not required
  • •You don't need to label private trips: without details, a trip counts as private
  • •The commute counts as a private trip

What Kilometra does and what you do

Date and kilometres Kilometra Every trip is recorded automatically, start and end to the second, kilometres along the road actually driven.
Location Kilometra Start and destination addresses are filled in automatically for business trips.
Person or company visited You For business trips, add a purpose, e.g. "Müller Ltd, quote". If a matching appointment is in your calendar, Kilometra suggests it.
Odometer on 1 Jan and 31 Dec You Take a photo of the odometer at the turn of the year and Kilometra reads it. The app reminds you on New Year's Eve and New Year's Day, and every month if you like.
Daily and without gaps You Keep your phone with you and categorise trips promptly. With the shortcut for your car, every trip is detected reliably. If one is missing, add it by hand.
Changes documented Kilometra Every later correction is recorded and appears in the change log of the tax PDF.
Private trips Kilometra Appear in the tax PDF without location or purpose, only with date and kilometres. According to the tax authority, that is enough.

Checklist before your tax return

Important

This page summarises the requirements and is not tax advice. The most detailed requirements in Switzerland are in the salary certificate FAQ of the Swiss Federal Tax Administration, and Kilometra follows them. In each case, your cantonal tax administration has the final say.

Source: Swiss Federal Tax Administration, salary certificate FAQ 2026, section 2.2.8 (PDF, in German)

As of October 2026