The Real Cost of Running a Semi-Trailer Per Kilometre in Australia 2026
What does it actually cost to run a semi-trailer per kilometre in 2026? Fuel, tyres, maintenance, insurance and finance — the full breakdown for owner-drivers.
If someone asks you what it costs to run your truck per kilometre, do you know the answer?
Most owner-drivers have a rough idea of their fuel cost per kilometre. Very few know their total cost per kilometre. And that number — the total cost per kilometre — is the most important figure in your business.
It determines the minimum rate you can accept on any load. It determines whether your business is profitable. And it determines whether you can afford to keep running or whether you are slowly burning through your savings without realising it.
Here is a full breakdown of the real cost of running a semi-trailer in Australia in 2026.
The Key Cost Categories
Fuel
Fuel is typically the largest single cost for an owner-driver, usually representing 30% to 40% of total operating costs.
A typical semi-trailer running at highway speeds will consume between 30 and 40 litres of diesel per 100 kilometres depending on load weight, terrain, speed and the age and specification of the engine.
At a diesel price of $2.20 per litre:
30L/100km = $0.66 per kilometre
35L/100km = $0.77 per kilometre
40L/100km = $0.88 per kilometre
These figures are for loaded kilometres only. Your empty kilometres cost the same fuel rate but generate zero revenue, which is why empty km management is so critical to profitability.
Tyres
Tyres on a semi-trailer or B-double are a significant ongoing cost that many drivers underestimate because the expense is irregular — you do not buy tyres every week so it is easy to forget they are part of your per-kilometre cost.
A reasonable estimate for tyre cost per kilometre on a semi-trailer is 4 to 7 cents per kilometre all-up across steer, drive and trailer tyres. On a B-double the figure is higher due to the greater number of tyres.
At 5 cents per kilometre, a driver covering 150,000km per year spends $7,500 on tyres annually.
Maintenance and servicing
Regular oil services, filters, brake work, suspension components, fifth wheel maintenance, lights and general repairs add up to a significant annual figure.
For a well-maintained semi-trailer covering 150,000km per year a realistic maintenance budget is $12,000 to $20,000 per year depending on the age and condition of the vehicle.
That works out to 8 to 13 cents per kilometre.
Finance
If your truck is on finance your repayment is a fixed cost that runs whether the truck is earning or not.
A $250,000 prime mover on a 5-year finance term at current rates might have a monthly repayment of $4,500 to $5,500. That is $54,000 to $66,000 per year, or 36 to 44 cents per kilometre at 150,000km annually.
Finance is often the biggest cost after fuel for owner-drivers with newer equipment.
Insurance
Comprehensive truck insurance, public liability and goods in transit cover for a semi-trailer will typically cost $15,000 to $25,000 per year depending on your history, the value of the truck, and the freight you carry.
At $20,000 per year and 150,000km that is 13 cents per kilometre.
Registration
Heavy vehicle registration in Australia varies by state and by the mass and configuration of your vehicle. Budget approximately $3,000 to $6,000 per year for a semi-trailer combination.
At $4,500 per year and 150,000km that is 3 cents per kilometre.
Other costs
Tolls, permits, driver medical and licence costs, phone and administration, accounting fees, load restraint equipment and safety gear all add up. Budget 3 to 5 cents per kilometre for miscellaneous costs.
Total Cost Per Kilometre — The Full Picture
Here is a realistic total cost per kilometre for an Australian semi-trailer owner-driver in 2026 at 150,000km per year:
Fuel (35L/100km at $2.20): $0.77/km
Tyres: $0.05/km
Maintenance: $0.10/km
Finance: $0.40/km
Insurance: $0.13/km
Registration: $0.03/km
Other: $0.04/km
Total: $1.52 per kilometre
This means on any load you accept, you need to be generating more than $1.52 per kilometre in revenue just to break even — before paying yourself anything.
If you are accepting loads at $1.60 per kilometre you are making 8 cents per kilometre profit. On a 1,000km run that is $80.
If you are accepting loads at $2.00 per kilometre you are making 48 cents per kilometre profit. On a 1,000km run that is $480.
This is why the rate per kilometre is the single most important number you need to know on every load.
How to Calculate Your Own Cost Per Kilometre
The figures above are guides. Your actual cost per kilometre depends on your specific truck, your finance situation, your insurance premium and your annual kilometres.
Here is how to calculate your own number:
Add up all of your annual fixed costs: finance repayments for the year, insurance premium, registration.
Add up your estimated variable costs for the year: fuel at your average consumption and the current price, tyres, maintenance.
Divide the total by your planned annual kilometres.
That is your break-even rate per kilometre. Any load paying above that rate is profitable. Any load paying below it is costing you money.
Use TruckProfit to Track Your Real Costs
The best way to know your true cost per kilometre is to track every single job. Enter the real costs on each run — not estimates, the actual figures — and over time you will build an accurate picture of what your truck actually costs to operate.
TruckProfit tracks all of this automatically. Every job you calculate is stored in your history and your dashboard shows your real average cost per kilometre across all your runs.