08/02/2026 -
The mileage log that (almost) writes itself
Keeping a mileage log is one of those tasks nobody really wants to do but that still has to be done. Most people find it tedious and unnecessarily time-consuming. And this is exactly where the same problem has existed for years: paper logs are error-prone, cumbersome and, all things considered, take far more time than you might think.
A forgotten entry, an illegible note or a correction in the wrong place – and the tax office no longer accepts the log. The German 1% rule then applies automatically.
We are taking a fresh approach: digital, automatic and reliable. A mileage log that largely keeps itself, reduces the effort involved and prevents errors from the outset.
The approach: less work, more reliability
Why do people still write down their journeys by hand when the vehicle already provides the relevant data? jammer.net connects this data – mileage, location, start and end times – to an app that automatically turns it into a mileage log that meets the requirements of the German tax authorities. No paperwork, no scraps of paper, no risk.
The combination of OBD plug, GPS data, encrypted storage and clear user guidance ensures that typical errors don't occur in the first place.
Keeping a mileage log: this is how easy it is with jammer.net
Ready to go in just 3 steps: install the app, plug in the OBD connector, start driving. That's all there is to it.
What keeping a mileage log can look like today – the key features
User-friendly smartphone app: The clearly structured app lets drivers keep track of their journeys and mileage at all times. Trip details such as purpose, contact person or vehicle assignment can be adjusted directly in the app while on the move. Operation is intuitive, and everything is done in just a few taps.
Automatic trip recording via OBD: The plug reliably records all data, such as the start of the journey, start and destination, mileage and movement data. You don't have to write anything down. All you do is classify each trip as private, business or commute with a single tap. This saves time, reduces errors and ensures complete documentation.
GoBD-compliant: jammer.net documents trips in line with the requirements of the German tax authorities (GoBD). Changes are logged in a tamper-proof way. Exports take just a few clicks. Data is stored in an audit-proof way for 10 years.
Capture receipts efficiently: Fuel receipts, workshop invoices or other expenses can be captured by photo, scan or manual entry. If the vehicle supports it, jammer.net even detects refuelling stops automatically.
Full flexibility, use it anywhere: App for iOS and Android, also usable in the browser and compatible with Apple CarPlay and Android Auto.
Data protection without compromise: All data is encrypted and processed exclusively on servers in Germany.
Export function: At the end of the month or year, you can export and download your mileage log as a PDF (Excel/CSV optional) or transfer it directly to DATEV.
Upgrade: telemetry & fleet management
More than a digital mileage log: a system that grows with you
If you need more functions or additional data, jammer.net can be expanded into a full telematics solution at any time. You get access to professional vehicle data, fleet overviews, workflows, driver communication, maintenance, departure checks, route planning, dashcam, CAN/FMS data and much more – powered by GPSauge.
Developed by GPSoverIP, award-winning, DEKRA-tested and in use in professional fleet environments for years.
Who is jammer.net for?
Self-employed professionals, freelancers and commuters: Easy to keep, properly documented, full tax transparency.
Company car drivers and employees required to keep a mileage log: No paper chaos, no risk of falling back on the 1% rule.
Companies with pool vehicles and field staff, fleets: Vehicle assignment, driver identification, reports, receipts, exports – all in one platform.
Tax advisory firms: A tool that saves clients from making mistakes and significantly reduces audit risks.
The jammer.net spots: three takes on an old problem
Our current campaign spots show the weaknesses of the paper mileage log – exaggerated, but spot on.
Save time
For frequent drivers, a paper mileage log eats up around 60 hours a year. Writing, correcting, adding missing entries – all by hand. jammer.net takes all of this off your hands.
👉 Watch the video
Save money – the tax trick
If you keep clean digital records, you avoid the 1% rule and only pay tax on your actual private use. No evasion, no trick – just genuine tax relief.
👉 Watch the video
Save effort and minimise risk
Paper mileage log? Rejected!
Illegible, incomplete, not kept promptly. That's exactly why so many paper logs fail. jammer.net reduces the effort and prevents exactly these errors.
👉 Watch the video
Starter package until 31/12/2025
For the launch, there is a limited starter offer at a special price:
👉 €198 (incl. VAT) – everything included for 365 days
Mileage log OBD plug + 12-month app licence
Switching bonus included
What it all comes down to
A mileage log shouldn't dictate your everyday
