WoF frequency sounds like it should be a single number, but it's worked out from the vehicle's date of first registration — and the rules are changing from 1 November 2026. This is a plain-English reference to how the interval is set, written so an inspector can answer a customer with confidence and a motorist can understand the answer.
The principle: it's keyed to first registration
How often a vehicle needs a WoF, and how long each warrant is issued for, is calculated from when the vehicle was first registered — in New Zealand or overseas, whichever is earlier. That single date drives everything below.
The current rules
Under the rules in force today:
- Vehicles first registered on or after 1 January 2000 need an annual WoF for the rest of their life.
- Vehicles first registered before 1 January 2000 need a WoF every six months.
New vehicles are the exception at the start of life. After the initial inspection, the next WoF isn't required until the third anniversary of first registration. The length a warrant is issued for follows from the same date:
| When the vehicle was first registered | WoF issued for |
|---|---|
| New, never registered | 3 years |
| Less than 2 years ago | To the vehicle's 3rd birthday |
| 2 to 3 years ago | 12 months |
| On or after 1 January 2000 | 12 months |
| Before 1 January 2000 | 6 months |
One recent change already in force: from 1 September 2025, light vintage and veteran vehicles over 40 years old moved from six-monthly to 12-monthly inspections.
What changes from 1 November 2026
The November 2026 amendment removes the six-month light-vehicle cycle and lengthens several intervals. In summary:
- New light vehicles: second WoF moves from the 3-year to the 4-year mark.
- Light vehicles 4 to 14 years old: annual becomes every two years (phased by registration date through to 1 November 2027).
- Light vehicles 14 to 26 years old: annual, unchanged.
- Light vehicles over 26 years old (registered before 1 January 2000): six-monthly becomes annual.
- Motorcycles registered before 1 January 2000: six-monthly becomes annual.
The full table, the phasing detail and the new ADAS scope items are covered in the November 2026 WOF inspection changes.
Where inspectors get caught
Two things reliably cause errors at the counter:
- Reading the wrong date. The interval keys off first registration, not the date the current owner acquired the vehicle or the date of the last WoF. An imported used vehicle's overseas first-registration date is what counts.
- The transition window. From November 2026, two vehicles of the same age can sit on different cycles because the 4-to-14-year change is phased on registration date. For about a year, "how old is it?" isn't enough — you need the registration date.
Both are exactly the kind of detail that should be confirmed by your system rather than carried in someone's head. Getting the interval wrong is a record-quality problem as much as a customer-service one, which is why it sits alongside the issues in common audit misses and how to avoid them. For how the underlying rules reach you when they change, see understanding VIRM amendments.