Fuel tax credits let eligible GST-registered businesses claim back, through the BAS, the fuel tax built into the price of fuel used in qualifying business activities. The catch is that the credit rate is not one number: it depends on the fuel type, the vehicle, and crucially whether the fuel powered a heavy vehicle on a public road, ran off-road machinery, or drove a light vehicle (which does not qualify on public roads at all). The rates also change at least twice a year, and in 2026 they have moved sharply due to temporary excise relief, which makes using the current ATO rate essential. See the ATO’s fuel tax credits for business overview and the fuel tax credit calculator for live rates. This guide explains how the credit works, walks a worked apportionment example, and shows why treating all diesel as one category either leaves cash on the table or creates review risk. Always use the ATO’s dated rates for the acquisition date; figures below are illustrative methods, not live rates.
Published: July 2026
Fuel excise (and the equivalent customs duty on imported fuel) is built into the price you pay at the bowser. For fuel used in eligible business activities, the government lets you recover some or all of that embedded tax as a fuel tax credit, claimed on your BAS. It is a real, often-missed cash benefit: many eligible businesses, particularly those with off-road machinery, never claim it because they do not know it exists, and others under-claim through poor record-keeping. To claim, the business must be GST-registered, the fuel must be taxable, and it must have been used in a qualifying activity.
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The same litre of fuel produces a different credit depending on how it was used, because the rate reflects what tax the fuel effectively bore for that use.
Heavy vehicles (over 4.5 tonnes) on public roads. These attract a lower credit, because a road user charge is subtracted from the credit to pay for the road wear heavy vehicles cause. The road user charge changes over time, and in 2026 it has been temporarily altered as part of fuel excise relief, so the heavy-vehicle-on-road rate is both lower than the off-road rate and currently in flux.
Off-road use and auxiliary equipment. Fuel used in machinery, plant, generators, and auxiliary equipment (even auxiliary equipment on a heavy vehicle, like a refrigeration unit or a concrete agitator) generally attracts the higher rate, because no road user charge applies. This is the highest-value category and the one most often under-claimed.
Light vehicles (under 4.5 tonnes) on public roads. These do not qualify at all for fuel used travelling on public roads. Claiming them is a common error that triggers ATO attention.
The gap between the road and off-road rates is large, which is why apportionment, correctly splitting your fuel between the categories, is where both the money and the compliance risk concentrate.
Hypothetical earthmoving and haulage business for one BAS quarter:
Illustrative rates for method only (replace with ATO dated rates for the acquisition dates):
Correct claim:
22,000 × $0.20 = $4,400
15,000 × $0.50 = $7,500
Light vehicles: $0
Total credit: $11,900
Wrong claim A: all diesel at on-road rate.
40,000 × $0.20 = $8,000. Under-claim of $3,900 versus correct split (and still incorrectly includes light vehicle litres if not removed).
Wrong claim B: all diesel at off-road rate.
40,000 × $0.50 = $20,000. Over-claim of $8,100 versus correct split, high review risk.
Interpretation. Apportionment is not bureaucracy; it is the difference between leaving thousands unclaimed and over-claiming tens of per cent. Across four quarters, a $3,900 quarterly under-claim is about $15,600 a year of missed cash.
Fuel tax credit rates normally change twice a year (February and August) with CPI indexation of the excise. In 2026 they have moved more than usual: a temporary fuel excise reduction from 1 April 2026 cut the credit rates, and the heavy-vehicle road user charge was temporarily set to zero for a period, then adjusted again from 1 July 2026, with further scheduled changes. The practical upshot is that the rate depends on the exact date the fuel was acquired, and applying last quarter’s rate to this quarter’s fuel is now a live source of BAS error. Use the ATO’s official fuel tax credit calculator, which holds the correct dated rates, for every claim.
Fuel tax credits reward two disciplines: claiming everything you are entitled to (especially higher-rate off-road and auxiliary use), and claiming it at the correct, current, date-appropriate rate with records that survive scrutiny. Both are undermined by treating fuel as one undifferentiated cost, and both are helped by a bookkeeping process that captures fuel by use category through the year. For fuel-heavy businesses, transport, logistics, agriculture, construction, earthmoving, getting this right is a recurring, meaningful cash benefit rather than an afterthought.
Hypothetical refrigerated transport operator for one quarter:
Illustrative rates (replace with ATO dated rates):
Correct claim:
48,000 × $0.18 = $8,640
5,500 × $0.48 = $2,640
Light vehicles: $0
Total: $11,280
If auxiliary is coded as ordinary road diesel: claim falls to about $8,640 (plus any incorrect light vehicle litres if not stripped). Under-claim ≈ $2,640 for the quarter, about $10,560 a year.
Interpretation. Auxiliary equipment is the silent under-claim. If the truck burns diesel for motive power and the fridge burns diesel for cold, those litres are not the same credit rate. Hour meters and tank logs turn a guess into a defensible apportionment. Industry bookkeeping context: the same cost-coding discipline in bookkeeping for trades and construction Australia applies to fuel categories in any plant-heavy ledger.
Claim full current entitlement when litres, dates and use categories are evidenced and rates match acquisition dates. Lodge with working papers tied to the BAS figure.
Fix records first when fuel cards are mixed personal/business, light vehicles are blended with heavy, or off-road plant has no logs. A clean quarter beats four noisy quarters that invite review.
Amend prior periods when you discover systematic under-claiming with reconstructable evidence. Quantify before amending; do not guess litres. Use registered agent support where the amounts are material.
Expensive option: claim the highest rate on everything because “we do earthmoving”. Practical option: three-way split every quarter (on-road heavy, off-road/auxiliary, ineligible) with a written apportionment method.
Separate ledger codes or tracking for heavy road fuel, off-road/plant fuel, and light vehicle fuel. Bank feed rules help; they do not replace category truth.
Fuel card reports by vehicle mapped to category. A ute and a 6-tonne truck must not share one blended average.
Bulk tank issues with dip readings and plant draw-offs. Bulk diesel without allocation is how off-road litres disappear into a single expense line.
Acquisition date discipline. Rate changes mid-quarter mean two rate sets can apply inside one BAS. Invoice date and delivery date matter; follow ATO guidance for the period.
BAS working paper. Litres × rates = label amount, filed with the BAS pack. Related process: how to prepare and lodge a BAS in Australia and BAS due dates.
Days 1 to 30. Split fuel ledger codes by category. Map every vehicle and plant item to on-road heavy, off-road/auxiliary or ineligible light road use. Start capturing hour meters and tank logs where auxiliary or plant use is material.
Days 31 to 60. Prepare one BAS claim using ATO dated rates and a written apportionment method. Compare to the previous “all one rate” habit and quantify the annualised gap.
Days 61 to 90. Lock the process into monthly bookkeeping so the BAS is an export. Review whether prior periods warrant amendment with reconstructable evidence. For fuel-heavy operators, treat the credit as recurring cash management, not an annual surprise.
What are fuel tax credits?
A credit for the fuel tax (excise or customs duty) built into the price of fuel used in eligible business activities, claimed through the BAS by GST-registered businesses. It is a real, often-missed cash benefit, particularly for businesses running off-road machinery.
Why does the fuel tax credit rate vary?
Because the rate reflects how the fuel was used. Heavy vehicles on public roads attract a lower rate (a road user charge is subtracted), off-road and auxiliary use attracts the higher rate, and light vehicles on public roads do not qualify at all.
What is apportionment and why does it matter?
Splitting your fuel correctly between the use categories so the right rate applies to each. It is where both the money and the risk sit: treating all fuel as one category either leaves credits unclaimed or over-claims.
Can I claim fuel tax credits on my car?
Not for a light vehicle (under 4.5 tonnes) travelling on public roads, which does not qualify. Off-road use of eligible equipment and heavy vehicle use are where credits arise.
Why are the 2026 rates more complicated?
A temporary fuel excise reduction from 1 April 2026 cut the rates, and the heavy-vehicle road user charge was temporarily set to zero then adjusted again from 1 July 2026, with further scheduled changes. The rate depends on the exact fuel acquisition date.
How do I make sure I use the right rate?
Use the ATO’s official fuel tax credit calculator, which holds the correct dated rates, and apply the rate for the date the fuel was acquired. Do not work from a remembered rate.
What records do I need for a fuel tax credit claim?
Litres, dates, and evidence of the vehicle or equipment and its use, enough to justify the apportionment if reviewed. Record-keeping is part of the claim, not separate from it.
Which businesses benefit most from fuel tax credits?
Fuel-heavy operations: transport, logistics, agriculture, construction and earthmoving, especially those with significant off-road or auxiliary equipment use at the higher rate.
Where do fuel tax credits appear on the BAS?
On the fuel tax credit labels of the activity statement (confirm current form labels). Keep a working paper that ties litres × rates to the figure lodged.
Can I amend a prior BAS if I under-claimed?
Often yes, subject to ATO amendment rules and time limits. If you discover systematic under-claiming, quantify it and seek registered agent guidance before amending.
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We review and check this guide periodically. At the time of writing (July 2026), all information was current. Scale Suite is a registered BAS Agent, not a licensed tax advisor or financial advisor. This content is general information only and does not constitute professional tax, financial, or legal advice. Some details may change over time.
Scale Suite is a Sydney-based provider of outsourced finance and HR services for Australian SMEs. We deliver bookkeeping, financial reporting, payroll processing, fractional CFO support, recruitment, employee onboarding, people and culture support, and fractional HR oversight, all as a fully embedded team that works inside your business.
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