How often does a tachograph need to be calibrated?
Tachographs need recalibration every two years under EU Regulation No 165/2014, plus after repairs, registration or tyre changes, or clock drift.
Logifie Team
Logistics Technology Experts
Under Regulation (EU) No 165/2014, both digital and analogue tachographs must be inspected and recalibrated at an approved workshop at least every two years. Recalibration is also mandatory immediately after any repair, a vehicle registration change, a tyre-circumference change, or whenever the tachograph clock drifts more than 20 minutes from UTC.
How often must a tachograph be calibrated under EU law?
The two-year interval is the baseline rule for every HGV and passenger vehicle fitted with a tachograph, whether it runs the older analogue system or a digital unit, including the current Regulation (EU) No 165/2014 tachographs on the road. The clock starts from the date of the last calibration seal, not the vehicle registration date, so fleet managers need to track each unit individually rather than assuming a fixed fleet-wide schedule. The rule applies equally to the newer smart tachograph generations: version 2 units, mandatory in new vehicles since 2023-08-21, and the light-commercial-vehicle tachograph requirement taking effect 2026-07-01 both still fall under the same two-year recalibration clock. Missing this window by even a day puts the vehicle out of compliance, which is why most operators build the reminder into whatever system already tracks MOT, insurance, and driver-hours data rather than relying on a paper diary. A transport management system that logs calibration dates alongside other compliance deadlines removes most of the risk of a missed cycle.
What triggers an early tachograph recalibration?
Several events force recalibration before the two-year mark, and operators are legally responsible for spotting them, not just waiting for the deadline. Any repair to the tachograph or its sensor requires immediate recalibration, as does swapping the vehicle to a new registration plate, fitting tyres with a different circumference than the ones the unit was calibrated against, or a clock drift of more than 20 minutes from UTC. Fleets running mixed tyre brands or replacing tyres mid-contract are particularly exposed to the tyre-circumference trigger, since it changes the distance calculation the tachograph relies on without necessarily being flagged by anyone at the depot. The European Commission's tachograph page confirms these conditions sit alongside the routine two-year cycle rather than replacing it. Drivers using the Driver Assistant app can flag a suspected fault or registration change as soon as it happens, so the workshop visit gets booked before a roadside check catches it.
What happens if you miss a calibration deadline?
Operating with an expired calibration exposes the vehicle to roadside enforcement stops, fines that vary by member state, and potential vehicle prohibition until the unit is recalibrated at an approved centre. Deeper background on which vehicles fall under the smart tachograph rules and the 2026 rollout timeline is covered in the smart tachograph requirements guide .
Frequently asked questions
How much does tachograph calibration cost?
Cost varies by country and workshop, but a routine two-year calibration for a digital tachograph typically runs from around EUR 100 to EUR 250 per vehicle, with analogue units and combined installation-plus-calibration visits priced higher. Fleets should budget this as a recurring per-vehicle line item rather than a one-off cost.
Who is allowed to calibrate a tachograph?
Only workshops formally approved by the relevant national transport authority may calibrate or seal a tachograph. In the United Kingdom, for example, GOV.UK's approved tachograph centre finder lists centres by tachograph type, since digital and analogue units require different approvals.
Does the two-year rule apply to both digital and analogue tachographs?
Yes. Regulation (EU) No 165/2014 applies the same two-year calibration interval to analogue and digital tachographs, and the same interval carries over to the newer smart tachograph generations. Vehicle type or tachograph generation does not change the underlying cadence.
What is the fine for driving with an out-of-date tachograph calibration?
Fines for an expired calibration are set at national level and vary widely across EU member states, ranging from moderate fixed penalties to significant sums for repeat or commercial-scale non-compliance. Roadside enforcement officers can also prohibit the vehicle from continuing until the tachograph is recalibrated, which creates a direct operational cost on top of any fine.
Fleets that want calibration deadlines tracked automatically alongside driver hours and vehicle compliance can get a quote for Logifie's fleet platform .
