If you own a car in New Zealand, two things will run your life whether you like it or not: your WOF and your rego. Let either one lapse and your car isn't legally allowed on a public road, no matter how well it actually runs. Yet plenty of owners — especially first-time buyers — aren't totally clear on what each one covers, how often they're due, or what really trips a car up on the hoist. This guide walks through both systems in plain English: how they differ, what an inspector checks, the most common fail points, roughly what to expect cost-wise, and what happens if you let either one slide.
WOF and Rego Are Two Different Things
People often use "WOF" and "rego" interchangeably, but they're separate systems checking separate things, and you need both current at the same time to drive legally.
Your Warrant of Fitness (WOF) is a periodic safety inspection. A certified inspector physically checks your car against a set of safety standards — tyres, brakes, lights, structure and so on — and either passes it or fails it. It says nothing about whether you've paid to use the road, only whether the car is safe enough to be on it.
Your rego (technically vehicle licensing, though almost everyone still calls it registration) is what you pay NZTA to keep your car legally licensed to be driven or parked on a public road. It's a cost-recovery system, not a safety check — there's no inspection involved in renewing it, just payment. "Vehicle registration," confusingly, technically refers to a car first entering the NZ fleet and being issued a plate, while the recurring payment is "licensing" — but "rego" has stuck as the everyday word for both.
A car can have a current WOF and an expired rego, or the reverse — either way, it's not legal to drive on a public road. You need both ticked off, not just one.
How Often You Need a WOF
WOF frequency depends on how old your car is and when it was first registered, not on how it's used.
- If your car was brand new when first registered, it doesn't need its first WOF until three years after that date. You still need current rego during those three years, just not a WOF.
- Once that exemption ends, vehicles first registered anywhere in the world after 1 January 2000 only need a WOF once every 12 months.
- Vehicles first registered before 1 January 2000 need a WOF every six months for the rest of their life, regardless of age or condition.
Your WOF expiry is shown on the label on your windscreen, and you can also look it up online through NZTA using your plate number if the sticker's faded.
What a WOF Inspector Actually Checks
A WOF is a safety check, not a full mechanical inspection — it's not testing engine efficiency or how good an example of the model your car is, only whether the systems that keep you and other road users safe are working properly. The main areas covered are:
- Tyres — tread depth, condition, and damage such as cuts or sidewall bulges.
- Brakes — pad and disc condition, handbrake function, and overall performance.
- Steering and suspension — steering play, joint and bush condition, and leaking shocks or struts.
- Lights — headlights, brake lights, indicators and reflectors, all working and correctly aimed.
- Windscreen and wipers — cracks or chips in the driver's line of sight, and functioning wipers.
- Seatbelts and structure — belt condition, anchor points, and structural rust or body integrity.
- Doors, mirrors and horn — latching, adjusting and functioning as intended.
- Exhaust — securely mounted, without excessive visible smoke or an illegally loud note.
The Most Common Fail Points
A handful of issues account for most WOF fails, and most are cheap to avoid if caught early.
- Tyres below the legal tread depth. New Zealand's legal minimum is 1.5mm across the central three-quarters of the tyre — consistently one of the most common reasons cars fail.
- Windscreen chips or cracks in the driver's sightline. A chip that's fine off to the side can be a straight fail if it's in the driver's line of sight.
- Worn brake pads or warped discs. Brakes wear gradually, so it's easy not to notice until an inspector measures them.
- A blown globe. A dead brake light or indicator is one of the most avoidable fails there is — a five-minute fix plenty of people simply haven't noticed.
- Rust in structural areas such as chassis rails, sills or suspension mounts, as opposed to cosmetic surface rust elsewhere on the body.
Get a pre-check at a garage you trust a week or two before your WOF is actually due. That gives you time to fix anything minor without your car sitting unwarranted while parts get ordered, and it's a lot less stressful than finding out on the day it's due.
Modified Cars and WOF Certification
If your car has been modified from factory specification, WOF inspectors are still checking it against standard safety criteria — but some modifications need separate certification before they'll even be considered for a pass. As a general rule, the more a modification touches structure, suspension, steering, brakes or power output, the more likely it is to need sign-off from a Low Volume Vehicle Technical Association (LVVTA) certifier first. Our guide to cosmetic mods vs performance mods in NZ covers which category different modifications typically fall into. If you're planning anything beyond straightforward cosmetic changes, check before you buy the parts, not after they're fitted and you're booking a WOF you're not sure will pass.
Vehicle Registration (Rego): What You're Actually Paying For
Your rego payment bundles a few things together: the ACC levy, which funds injury compensation cover for road crashes; administration, including your plate and NZTA's running costs; and, depending on your vehicle, a contribution toward road use.
Petrol Excise vs Road User Charges
Petrol vehicles contribute to road funding through fuel excise duty, already built into the pump price, so you pay it every fill-up rather than as a line item on your rego. Diesel and most heavier vehicles instead pay Road User Charges (RUC) based on distance travelled, tracked through a licence label that stays current alongside WOF and rego. Electric vehicles were originally exempt to encourage uptake, but that exemption has since ended — EVs are now also liable for RUC.
You can license your vehicle for 3, 6 or 12 months at a time, and renew online through NZTA, at a post shop, or through the AA. What you'll pay depends on your vehicle's class, weight and fuel type — check your renewal notice or NZTA's fee information for the number that applies to your car.
What Happens If You Let It Lapse
Letting either your WOF or rego expire isn't just a paperwork technicality — it carries real consequences. Driving on a public road with either expired is an offence, and you're at risk of an infringement notice from Police if you're pulled over or involved in an incident. There's no exemption for a short trip "just to get it fixed" — once either has expired, the car needs to stay off public roads, in practice meaning kept on private property.
It can also affect your insurance. Many policies reserve the right to decline a claim if your vehicle wasn't legally warranted or licensed at the time of a crash — worth checking your policy wording, but it's a genuine risk that catches people out at the worst possible time.
And if you're planning to sell, a current WOF matters directly: for a private sale in New Zealand, your vehicle generally needs a WOF less than one month old at the time of sale. If you're weighing up selling privately versus other options, our guide on selling your car in NZ covers what buyers and dealers actually look for, WOF included.
A Practical Checklist for Staying Legal
- Check your WOF expiry on the windscreen label, or look it up via NZTA using your plate number if you're not sure.
- Book in a week or two before it's due, so there's time to fix minor issues without the car going unwarranted.
- Renew your rego before it lapses — don't drive on an expired licence even for a short trip.
- If your car's modified, check whether any of the work needs LVVTA certification before you book a WOF test.
- If you're diesel, heavy-vehicle or now EV, keep your Road User Charges current alongside your WOF and rego, not as an afterthought.
- Selling privately? Get a fresh WOF sorted first — buyers and the law both expect one less than a month old.
FAQ
How much does a WOF cost in NZ?
There's no fixed government price for a WOF inspection — every testing station and licensed garage sets its own fee, so prices vary from place to place. It's worth comparing a couple of options nearby, especially if your car needs a check every six months, since that cost adds up over a year. Ask for the price when you book rather than assuming it matches what you paid last time or what a friend paid elsewhere.
What's the difference between a WOF and a COF?
A Warrant of Fitness (WOF) applies to standard light passenger vehicles used privately. A Certificate of Fitness (COF) is the equivalent inspection for heavier vehicles and any vehicle used to carry passengers for hire or reward, such as taxis, rideshare cars, rental vehicles and buses. COF inspections are generally more frequent and more rigorous than a standard WOF, reflecting the higher use and passenger-carrying role of those vehicles.
Do electric vehicles need a WOF?
Yes. Electric vehicles go through the same Warrant of Fitness process as petrol vehicles, on the same age-based schedule. The inspection covers the same core safety systems — tyres, brakes, steering, suspension, lights, seatbelts and structure — though obviously there's no exhaust smoke check. EVs are also no longer exempt from ongoing road costs the way they once were, so don't assume owning one gets you out of NZ's on-road cost system entirely.
Can I still drive my car if the WOF or rego has expired?
Not legally, and not even just to get it fixed. Once your WOF or vehicle licence has expired, driving on a public road — including a short trip to a testing station — puts you at risk of an infringement notice from Police. If your car isn't currently warranted or licensed, the safest option is to keep it off public roads (stored on private property) until you've sorted it, or arrange for it to be towed or trailered to a testing station instead of driven.