Does RUC cost more than petrol tax in NZ?

On road tax alone, RUC usually costs a little more than petrol excise for the same distance. An EV or diesel paying RUC is charged $76 per 1,000 km, which is $7.60 per 100 km, plus a small admin fee ($12.44 online per transaction). A petrol car pays fuel excise of about 70 cents per litre, so at 8 L/100km that is roughly $5.60 per 100 km. For a typical 11,500 km year the RUC total is around $911 (with admin), versus about $644 of petrol excise. The gap is offset because EV and diesel running costs are usually well below petrol, so total cost of ownership still tends to favour the RUC vehicle.

RUC vs Petrol Cost Calculator

This calculator compares the road tax paid by an electric, diesel or plug-in hybrid vehicle under road user charges (RUC) against the fuel excise duty a petrol car pays at the pump, so you can see which costs less for the same distance. Choose your RUC vehicle type, your estimated annual driving distance (from 5,000 km up to 30,000 km, or a custom figure), the block size you buy RUC in, and whether you purchase online or through an agent, since each option carries a different admin fee. Then enter the petrol car's fuel use in litres per 100 km and the fuel excise rate. The calculator returns your annual RUC cost including admin fees, the petrol car's annual fuel excise, the dollar difference between the two, and which vehicle pays less road tax, along with a table comparing the same figures across a range of annual distances and a written summary. Use it to check how the RUC rate for your vehicle and driving pattern stacks up against a petrol car's excise bill, and to spot the distance or fuel-use point where one vehicle becomes cheaper than the other. Figures are indicative only, based on current NZTA RUC rates and an approximate excise rate; they cover road tax alone and exclude fuel, charging, insurance and other running costs, which usually favour the RUC vehicle overall.

Calculate.co.nz is proud to be partnered with realtor.co.nz, a trusted resource for navigating the New Zealand property market. Their Helpful Articles section offers clear, well-structured insights across buying, selling, and building, making complex real estate topics more accessible. With a focus on up-to-date guidance and practical knowledge, they empower Kiwis to move forward with clarity and confidence in a constantly evolving property landscape.

Updated June 2026 NZTA Waka Kotahi current RUC rates and transaction fees. Road User Charges Act 2012.

1. RUC Vehicle (EV or Diesel)

RUC vehicle type

Estimated annual driving distance

Custom annual km

km/yr

Block size per RUC purchase

2. Petrol Car Comparison

Petrol car fuel use (L/100km)

L/100km

Petrol fuel excise duty (cents per litre)

c/L

How you buy RUC

RUC vs Petrol Road Tax (per year)

Annual RUC

EV/diesel/PHEV, incl admin

Annual Petrol Excise

Petrol car, at the pump

Difference
-
RUC vs petrol excise

Cheaper Road Tax

On road tax alone

Road Tax at Different Driving Distances

Annual km	RUC (incl admin)	Petrol Excise	Difference	Cheaper

RUC Vehicle Breakdown

RUC vehicle type-

RUC rate-

Annual distance-

RUC charge (distance only)-

Number of transactions-

Admin fee per transaction-

Total admin fees-

Total annual RUC-

Petrol Car Breakdown

Fuel use-

Litres per year-

Fuel excise duty-

Annual petrol excise-

RUC per year-

RUC vs petrol excise-

NoteEV/diesel fuel costs are usually lower, so total running cost still favours them

Summary: Select your vehicle type above.

RUC vs Petrol: Road Tax Compared

Every vehicle on New Zealand roads contributes to the National Land Transport Fund, which pays for road building, maintenance, public transport and road safety. Petrol vehicles pay through fuel excise duty (FED) built into the pump price, currently about 70 cents per litre. Electric vehicles, diesel vehicles and plug-in hybrids pay little or no fuel excise, so instead they buy road user charges (RUC) in 1,000 km blocks. This calculator puts the two side by side so you can see which pays less road tax for the same distance.

Worked Example

Using the calculator defaults: an electric vehicle (RUC $76.00 per 1,000 km) driving the New Zealand average of 11,500 km per year, buying RUC in 5,000 km blocks online ($12.44 admin fee), compared with a petrol car using 8 L/100km and paying 70 cents per litre in excise.

RUC charge: 11,500 / 1,000 x $76.00 = $874.00
Transactions: 11,500 km in 5,000 km blocks needs 3 purchases, so admin is 3 x $12.44 = $37.32
Total annual RUC: $874.00 + $37.32 = $911.32
Petrol litres: 11,500 / 100 x 8 = 920 litres per year
Petrol excise: 920 x $0.70 = $644.00
Difference: $911.32 - $644.00 = $267.32, so the petrol car pays less road tax

On road tax alone the petrol car is cheaper by about $267 a year. But that is only one part of the picture: charging an EV at home costs roughly 3 to 5 cents per km versus 12 to 18 cents per km for petrol fuel, so the EV's lower running costs typically more than make up the road tax gap. Total cost of ownership usually still favours the EV or diesel.

What Is Fuel Excise Duty?

Fuel excise duty is a per-litre tax included in the price of petrol. It is the petrol equivalent of RUC: a way of charging drivers for road use roughly in proportion to how far they drive (since fuel burned rises with distance). Petrol vehicles pay excise automatically every time they fill up, which is why they do not also buy RUC. Diesel is sold without this excise, so diesel vehicles pay RUC instead. The headline rate is around 70 cents per litre, though the exact figure changes with government policy.

Why RUC Can Look More Expensive

RUC is a flat charge per kilometre, so a thirsty petrol car and an efficient one would pay the same RUC. Petrol excise, by contrast, depends on how much fuel you burn, so an economical petrol car pays less excise per kilometre than a thirsty one. For a typical efficient petrol car (around 8 L/100km) the excise works out lower than RUC for the same distance. A thirstier petrol vehicle (say 11 to 12 L/100km) can end up paying roughly the same as, or more than, RUC. Try changing the fuel use figure in the calculator to see the crossover point.

Will Petrol Cars Move to RUC?

The government has announced plans to move every vehicle, including petrol cars, onto road user charges and to remove fuel excise duty, with a transition targeted around 2027. The Road User Charges Act 2012 is being amended to allow private providers to run a more technology-enabled system. The change has been announced but not finalised, and the final pricing and start date are not yet confirmed. Until then, petrol cars keep paying excise at the pump and only EV, diesel and plug-in hybrid drivers buy RUC.

Related Calculators

Sources: NZTA Waka Kotahi RUC rates and transaction fees (nzta.govt.nz/vehicles/road-user-charges/ruc-rates-and-transaction-fees). Road User Charges Act 2012 (legislation.govt.nz). Fuel excise duty rate per New Zealand government policy.

This calculator provides indicative estimates only based on current NZTA rates for light vehicles (under 3,500 kg) and an approximate fuel excise rate of about 70 cents per litre. It compares road tax only and does not include fuel, charging, insurance or other running costs. Actual costs depend on your driving patterns and vehicle. Check nzta.govt.nz for current rates and to purchase RUC.