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When a UK vehicle needs a tachograph: the 3.5-tonne rule, towing, exemptions, and the 2026 van and electric-van changes - with a clear decision check.
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A tachograph is legally required when your vehicle is in scope of the assimilated drivers’ hours rules (the rules previously called the EU rules) or the AETR rules. In plain terms, that normally means a goods vehicle, or vehicle-and-trailer combination, with a maximum permissible weight over 3.5 tonnes, or a passenger vehicle built to carry more than nine people including the driver, used on the road to carry goods or passengers.
Two 2026 changes shift the edges of that rule. From 1 June 2026, zero-emission goods vehicles over 3.5t and up to 4.25t carrying goods for a business in Great Britain are out of scope and need no tachograph. From 1 July 2026, goods vehicles over 2.5t used on international journeys for hire and reward come into scope and must have one.
If a specific exemption or national derogation removes your vehicle from scope, you do not need a calibrated tachograph for that work. You will usually then fall under the GB domestic drivers’ hours rules, which have their own (lighter) record-keeping.
The quick test:
The common mistake is to ask only whether a tachograph is fitted. The better question is: what rules apply to this vehicle on this journey? The same vehicle can be in scope on one job and out of scope on another. A rigid HGV doing ordinary haulage needs the tachograph; the same vehicle on a genuine road test after repair may not. A unit in the cab does not make every movement in scope.
Work through it in this order:
Whether you need a tachograph follows scope: in scope of the assimilated or AETR rules means a tachograph must be fitted and used; out of scope means it need not be. The thresholds are based on the vehicle’s maximum permissible (plated) weight, not what it happens to weigh on the day.
The assimilated rules apply to most goods vehicles where the maximum permissible weight, including any trailer or semi-trailer, exceeds 3.5 tonnes, used wholly within the UK or between the UK and the EU. DVSA’s guidance is explicit that the vehicle does not need to be laden - an empty return leg is still part of an in-scope operation.
A van, pickup or 4x4 that would be fine on its own can be pulled into scope by a trailer. Per GOV.UK’s light-vehicle guidance, you need a tachograph when you are driving a smaller vehicle for towing and both apply: the maximum authorised mass of the vehicle and trailer combined is more than 3,500kg, and the use is commercial. It is the plated weights that count, not the load on the day.
For passenger work, scope turns on seats, not weight. A vehicle constructed or permanently adapted to carry more than nine people including the driver is in scope, subject to the passenger exemptions. A regular service on a route not exceeding 50km is a key exemption - but it must be a genuine regular service (specified route, specified intervals, predetermined stops). A one-off private hire that happens to be short does not qualify just because the mileage is low.
A heavy goods or passenger vehicle can fall out of scope because of how it is being used. Drivers employed to drive an in-scope vehicle who never carry goods or passengers in that role are not in scope - moving an empty vehicle between depots, taking one to be repaired or scrapped, or collecting a hire vehicle. Work done wholly off the public road is also out of scope, although off-road driving still has to be recorded as ‘other work’ where the driver is otherwise in scope.
Goods vehicles and combinations with a maximum permissible weight of 3.5 tonnes or less are outside the assimilated rules and need no tachograph for UK work. They fall under the GB domestic rules instead. Remember the trailer counts towards that 3.5t - it is the combination that matters.
This is new and it matters for anyone electrifying a van fleet. Until recently, an electric van over 3.5t was caught by the assimilated rules purely because battery weight pushed it past the 3.5t line, needing a tachograph unless it stayed within a 100km radius of base. From 1 June 2026, under the Goods Vehicles (Testing, Drivers’ Hours and Tachographs etc.) (Amendment) Regulations 2026:
From 1 July 2026, a smart tachograph 2 must be fitted into goods vehicles with a gross weight of 2,501kg or over undertaking international journeys for hire and reward. Two carve-outs are confirmed in DVSA’s Approved Tachograph Centre special notice 02-26:
Northern Ireland operators running into the Republic of Ireland are caught, because that is an international journey. If this might apply, audit which vans exceed 2.5t (including any trailer), confirm whether the work is hire-and-reward, and book installation early - approved fitting centres get busy ahead of the deadline (typical lead times run to several weeks).
Even when a vehicle is over 3.5 tonnes, a defined exemption or derogation may take it out of scope for that work. There are two families, and the difference matters:
The exemptions most likely to be relevant to commercial operators include:
Relevant UK-only national derogations include vehicles used in connection with sewerage, water, gas and electricity maintenance, road maintenance and control, agricultural/forestry/fishery work within 100km, and door-to-door household refuse collection - each with conditions that are easy to overstep.
The one most small operators ask about. A vehicle or combination not exceeding 7.5 tonnes is exempt where it is used only for carrying materials, equipment or machinery for the driver’s own use in the course of their work, or for delivering goods produced on a craft basis. All three conditions must be met:
So an electrician or builder running tools and materials to their own jobs in a sub-7.5t vehicle, within 100km, who spends most of the day working rather than driving, can rely on this. Step outside any one condition - over 7.5t, beyond 100km, carry for reward, or make driving the main job - and a tachograph is needed.
It is worth being blunt about the operations people assume are special but are not. Over 3.5 tonnes with no exemption fitting the journey means in scope, tachograph required.
Waste is the classic trap. There is a national derogation for door-to-door household refuse collection or disposal, but it is narrower than it sounds. DfT’s view is that, to qualify, the operation should:
A council round, or a contractor running that round, can be exempt. A commercial skip-hire operation, a tipper taking construction or trade waste to a transfer station, roll-on-roll-off work, or bulk waste haulage is not covered - that is ordinary haulage, in scope. The derogation is UK-only, so it never helps on a cross-border journey.
If your vehicle is out of scope of the assimilated rules, you usually move onto the GB domestic drivers’ hours rules (Part VI of the Transport Act 1968). No calibrated tachograph is required, but limits and records still apply:
You can use a tachograph voluntarily under GB domestic rules. If a vehicle has one fitted but moves to out-of-scope work, keep it calibrated and sealed - you needn’t recalibrate while the seals are intact and the vehicle stays out of scope, but a broken seal or a return to in-scope work changes that.
Be careful where a driver mixes in-scope and out-of-scope work in one day. Even a short period driving under the assimilated rules brings the driver into scope for that day’s daily driving, break and rest requirements, and the weekly rules have to be managed too. Other work, including work outside the tachograph rules, still has to be recorded properly.
Where a vehicle has a digital or smart tachograph fitted but the journey is genuinely out of scope, DVSA recommends selecting ‘out of scope’ on the unit. It is not generally a legal requirement, but it makes the record easier to explain later. Selecting ‘out of scope’ does not create an exemption - the legal position still depends on the vehicle, the journey and the use.
That is a separate question from whether you need one. In short, the requirement is now the second-generation smart tachograph (Smart Tachograph 2) for new and international fitment, on this timeline:
Vehicles operating only within the UK can generally keep using the analogue, digital or smart 1 unit already fitted until it is replaced. Most operators already have the right hardware - the live question is usually scope, not the unit.
These cause regular problems in real fleets:
Operating only in the UK, normally outside the assimilated tachograph rules. GB domestic drivers’ hours may still apply where the vehicle is used for a trade or business.
If the plated combination exceeds 3.5t and the use is commercial, it may need a tachograph. Check the plated MAM of the vehicle and trailer, not the actual weight on the day.
The 100km materials-and-equipment exemption can apply if the vehicle is not over 7.5t, the driver carries materials/equipment/machinery for their own work, within 100km of base, driving is not their main activity, and the transport is not for reward. Miss one condition and the position changes.
From 1 June 2026, a zero-emission goods vehicle over 3.5t up to 4.25t carrying goods for a business in GB is out of scope and needs no tachograph, with no distance limit. A GB–NI journey still needs one.
Don’t assume ‘waste’ means exempt. The household-refuse derogation has its own conditions; commercial waste, skip hire, transfer-station and bulk movements usually stay in scope.
A vehicle built or adapted for more than nine people including the driver normally needs a tachograph for passenger carriage, unless an exemption applies. A regular service route not exceeding 50km is different from an occasional private hire that happens to be short.
For anything marginal, keep a short written decision record - not a legal essay, just enough that a transport manager, auditor or DVSA examiner can see how you reached the position. Record:
This is especially useful for mixed fleets - vans towing trailers, 7.5-tonne trade vehicles, waste vehicles, recovery vehicles, minibuses and electric vans around the 3.5-tonne line. If the answer depends only on ‘we’ve always done it this way’, treat that as a warning sign.
‘Does my vehicle need a tachograph?’ nearly always comes down to weight (including any trailer) or passenger capacity, then whether a specific exemption fits the journey - with the 2026 van and electric-van changes shifting the edges. Get those right and the rest follows. For the full picture of every exemption and derogation, see our pillar guide ‘Drivers’ Hours Exemptions: When the Rules Don’t Apply’.
Where vehicles are in scope, the ongoing job is using the tachograph correctly, downloading on time and dealing with infringements - and good analysis shows exactly when a driver was in scope, when work was out of scope, and where records don’t line up. That analysis is where Tacho Agent supports operators: checking the data, identifying infringements and helping build the evidence trail, so the compliance picture is clear before anyone asks for it.
This article is provided for general guidance only and reflects our understanding of the rules as they apply in Great Britain as at the date shown on this page. It is not legal advice and should not be relied on as a substitute for advice tailored to your specific operation.
Drivers' hours, tachograph, working time and operator licensing rules are detailed and change over time, and some requirements differ in Northern Ireland and for international journeys. Always check the current guidance on GOV.UK and the underlying legislation on legislation.gov.uk, and consult your transport manager or a qualified compliance professional before acting.
To the fullest extent permitted by law, Tacho Agent Ltd accepts no liability for any loss arising from action taken, or not taken, in reliance on this article. Nothing here excludes or limits any liability that cannot lawfully be excluded, including for death or personal injury caused by negligence or for fraud. Use of this article is also governed by our Terms of Use.
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