KmFlow
Sole trader
One car, lots of trips. If you drive more than the flat-rate allowance covers, itemised claims need a log that is accurate to the kilometre.
In development · the test car is already recording
The trip log that keeps itself.
We never invent trips for your log. Plug the device into your car, KmFlow records every trip, and at the end of the month you approve them. Only what the car actually drove goes in.
- 0 invented trips
Only what the car's GPS recorded goes into the log.
- 1 PDF a month
Close the month, print it, sign it, file it.
- Our own maps
Runs on a server in Budapest; addresses come from our own map server, not from Google.
Friday evening, end of the month.
You're sitting with your calendar and fuel receipts, trying to remember whether you drove to Vác or to Göd on Tuesday. Your accountant wants the log on Monday.
If a detail is missing, you can't claim that cost, and you can't add it later either. With KmFlow the list builds up as you drive; you only need to check it.
Tuesday, 4 NovemberSample
08:12–08:51Budapest, Váci út 23. → Vác, Széchenyi u. 3.34.2 kmBusiness
12:40–13:05Vác, Széchenyi u. 3. → Göd, Pesti út 81.14.8 kmBusiness
17:30–18:02Göd, Pesti út 81. → Budapest, Váci út 23.27.9 kmPrivate
October · ABC-123✓ Closed
- Distance
- 1,248 km
- Business share
- 86%
- Trips
- 41
Plug it in, and the log keeps itself.
You install the device once. After that, all you do is mark which trips were business and close the month at the end.
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Plug in the device
The OBD GPS device goes into the diagnostic port under the steering wheel. No tools, no mechanic.
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Trips record themselves
Ignition on starts a trip, ignition off ends it: every trip lands in your list with start and end address, time and distance.
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Business or private, in one click
Add the purpose and the partner you visited to business trips. Set private trips aside with a single click.
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The PDF is ready at month end
Close the month and get a printable trip log with an ID and a verification QR code. A closed month no longer changes.
From one car to a whole fleet.
The same log, just at a different scale.
Company and fleet
Several cars, several drivers, a separate log for each car. For leased cars, itemised records are the basis for reclaiming VAT.
Accountant Coming soon
Your clients' logs in one place, with closed months and exports. Accountant access is the next step.
No month-end scramble
The log builds up as you go. At month end, all that's left is checking it.
No gaps in your log
What isn't written down can't be claimed. The device records every trip, even the ones you'd forget.
Calm during an audit
A closed month can't be edited. Corrections only happen as a new, logged version, so it shows what changed and when.
What does the monthly trip log contain?
In Hungary, you can only claim the costs of a car that is also used privately if the log contains every mandatory detail. KmFlow collects them:
- Per vehicle: type, plate number and fuel consumption norm.
- Odometer reading on the first and last day of the year, monthly when claiming costs.
- Per trip: time, purpose, partner visited and distance.
- Business driving: start and end odometer reading.
Nothing has to be submitted to NAV: the log has to be kept, retained and shown on inspection.
General summary, not tax advice. Your accountant can answer for your specific situation.
Trip log · October 2026Sample
ABC-123 · Škoda Octavia 1.5 TSI · norm 8.6 l/100 km
| Day | Purpose, partner | Odometer | km |
|---|---|---|---|
| 1 Oct | Quote · Minta Kft., Vác | 48,112 → 48,146 | 34 |
| 1 Oct | Site survey · Példa Bt., Göd | 48,146 → 48,161 | 15 |
| 3 Oct | Handover · Próba Zrt., Szentendre | 48,189 → 48,213 | 24 |
ID: KMF-2026-10-0042
Verifiable with the QR code
Verifiable with the QR code
What it doesn't do, and what it doesn't claim.
- It doesn't invent trips.If you didn't go anywhere, the log stays empty. Trips are only suggested from real GPS data and only become entries with your approval.
- It isn't “NAV-certified”.NAV doesn't certify trip log software. Anyone who says so is doing marketing. We deliver the mandatory content.
- No mobile app yet.The first source is the OBD device. Recording with your phone comes later.
- You can't sign up yet.The first version is being built; we're testing it with the test car.
At month end, all that's left is your signature.
KmFlow is being built right now. If you have a question, or would like to be among the first to try it with a test car, write to us.