Most businesses that book freight have never heard of the heavy vehicle road user charge, even though it's built into the cost of every truck that moves their goods. In 2026 it suddenly became worth knowing about. Between April and August it fell from 32.4 cents a litre to zero, came partly back, and then returned to its previous level. If your freight costs or fuel levy moved around in that period, this is part of the reason.
Here's what the charge is, how it's collected, what happened to it in 2026, and how it flows through to the freight you pay for.
What the Heavy Vehicle Road User Charge Is
The heavy vehicle road user charge (RUC) is a federal charge on the fuel that heavy vehicles use on public roads. For fuel tax purposes, a heavy vehicle is generally one with a gross vehicle mass over 4.5 tonnes, which covers almost every truck used for commercial freight.
Along with annual registration charges, the RUC is the main way heavy vehicles contribute towards the cost of the roads they use. It's set as a rate per litre of fuel, or per kilogram for gaseous fuels.
How It's Actually Paid
There's no separate RUC bill. It's collected through the fuel tax system in two steps:
- Fuel excise is paid on all diesel and petrol, and it's included in the price at the pump. Everyone pays this up front, truck operators included.
- Businesses can claim back part of that excise as a fuel tax credit. For fuel used by a heavy vehicle on a public road, the credit is the excise rate minus the road user charge.
So a truck operator pays full excise at the bowser, claims a fuel tax credit, and the part of the excise they don't get back is, in effect, the road user charge. Before the 2026 changes, diesel excise was 52.6 cents a litre and the RUC was 32.4 cents, so a heavy vehicle operator could claim back 20.2 cents and kept paying 32.4 cents a litre in road user charge.
For the fine print on claiming fuel tax credits, including record-keeping and eligibility, the Australian Taxation Office (ATO) is the authoritative source. This article explains the mechanism; it isn't tax advice.
What Changed in 2026
On 30 March 2026, the federal government announced temporary cuts to fuel excise and the road user charge, starting 1 April. The rates then stepped back up in two stages. Using the ATO's published fuel tax credit tables:
| Period | Diesel excise (approx.) | Road user charge | Fuel tax credit, heavy vehicle on public roads |
|---|---|---|---|
| Before 1 April 2026 | 52.6c per litre | 32.4c per litre | 20.2c per litre |
| 1 April to 30 June 2026 | 20.6c per litre (cut by 60.9%) | 0.0c per litre | 20.6c per litre |
| 1 July to 2 August 2026 | 36.6c per litre (cut by 30.4%) | 16.4c per litre | 20.2c per litre |
| From 3 August 2026 | 53.7c per litre | 32.4c per litre | 21.3c per litre |
Two things stand out in that table.
The fuel tax credit for trucks barely moved. It stayed between about 20 and 21 cents throughout, because excise and the road user charge were cut together.
The road user charge is what changed for operators. Their net fuel tax went from 32.4 cents a litre to nothing for three months, then to 16.4 cents for one month, then back to 32.4 cents from 3 August. Meanwhile, the excise cut lowered the pump price of diesel for everyone, which affects cash flow even for businesses that claim the credit back later.
What That Means in Dollars
The road user charge applies per litre, so its effect scales with how much fuel a run uses. Take an illustrative long-distance run that burns 1,000 litres of diesel:
| Period | Road user charge on 1,000 litres |
|---|---|
| Before 1 April 2026 | $324 |
| 1 April to 30 June 2026 | $0 |
| 1 July to 2 August 2026 | $164 |
| From 3 August 2026 | $324 |
Multiply that across every truck movement in a freight network for several months and you can see why fuel-related costs were moving through the year. It's also why a freight rate quoted in May could look different from the same lane quoted in September.
How It Flows Through to Freight Costs
Freight customers don't pay the road user charge directly. It's one of the costs a transport operator carries, alongside the price of diesel itself, and it reaches you in two ways:
- Through the fuel levy. Most carriers adjust a fuel levy on a regular cycle against a published fuel price reference. When the excise cut lowered pump prices, those references moved too. Our guide to fuel levies explains how levies are set and reviewed.
- Through base rates. Some costs are built into base rates rather than the levy. How quickly a change to the RUC reaches a base rate depends on the provider and on any contract terms that fix rates for a period.
Because every provider indexes and reviews differently, two quotes taken in the same week can treat the 2026 changes differently. Comparing quotes on the total cost, not the base rate alone, avoids most of the confusion.
What to Ask Your Freight Provider
If your freight costs moved during 2026 and you want to understand why:
- What is your fuel levy indexed to, and how often is it reviewed? That tells you how quickly changes in diesel prices and fuel tax will show up on your invoice.
- Is the fuel levy shown separately on my invoice? A separate line makes changes visible rather than hidden in the base rate.
- Did my contract fix rates for a period? If so, changes during that period may only show up at the next review.
- What should I expect from here? No one can promise where fuel prices go next, but a provider should be able to explain how future changes will be passed through.
Running the numbers on your own freight helps too. Our cubic weight guide and our list of ways to reduce freight costs cover the parts of the bill you can actually control.
How Ozcoast Shows Fuel Costs
Our rates include a fuel levy that's calculated and reviewed against current fuel costs, and it's shown as its own line on your invoice rather than folded into the base rate. If you want to see how the current levy applies to your freight on our general freight or interstate freight services, ask us and we'll walk you through it.
Rates in this article come from the ATO's published fuel tax credit tables as at October 2026. Rates can change, so check the ATO for current figures before relying on them.
