Do You Actually Need an International Driving Permit? A Country-by-Country Check

The short answer

Most of the advice you will read about international driving permits is aimed at the car rental desk, not the law. The rental company wants to see a permit because it wants to limit its liability. The legal requirement is a separate question, and in several popular destinations the answer is that you do not need one at all. New Zealand lets you drive on a valid overseas licence for 18 months with no IDP. Japan requires a document — but for holders of Swiss, German, French, Belgian, Monaco and Taiwanese licences it is a JAF translation, not an IDP, and for everyone else the IDP must be a 1949 Geneva permit because Japan does not accept 1968 Vienna permits.

What is genuinely universal is narrower than people think: an IDP is not a licence. It is a translation of one, and in nearly every jurisdiction that recognises it you must carry it together with your original home licence. The US government states it plainly: “While visiting another country, carry both your IDP and driver’s license.”

What changed, and it lands in three weeks

New Zealand is about to cut its overseas-licence window in half. The NZ Transport Agency extended the period from 12 to 18 months in 2024 to ease pressure on driving-test wait times — and the extension was explicitly temporary. It ends 31 October 2026, and from 1 November 2026 the period returns to 12 months from the day you last arrived. After that you either convert your licence or stop driving.

This matters more than it looks. The 18-month window is long enough that a long-stay visitor who arrived under it may be mid-drive when the change lands. The agency’s own wording is worth reading closely: if you have already started converting but have not yet got a New Zealand licence — for example you have not passed the theory test — “you can continue to drive on your overseas licence for up to 18 months from when you last arrived.” The 18-month path does not vanish for everyone at once; it survives for people partway through a conversion. But if you have no conversion in progress, plan on 12.

The rule that catches the most people: 1949 and 1968 are not interchangeable

There are two different international driving permits in circulation and they are not the same document. The 1949 Geneva Convention and the 1968 Vienna Convention each specify their own permit model, and countries recognise them differently.

Japan is the cleanest example of how sharply this cuts. The Japan Automobile Federation states it without hedging:

Holders of an International Driving Permit (IDP) issued abroad under the September 19, 1949 Geneva Convention on Road Traffic can drive a vehicle in Japan in accordance with Japanese laws.

Please note that IDPs issued in accordance with other treaties (such as the 1968 Vienna Convention) are not valid in Japan.

So a 1968 Vienna permit — the one several European countries hand out by default — is not valid in Japan. If you are heading to Japan and hold a permit issued under the 1968 convention, it is not the document you need.

The UK government draws the same line on its own side of the transaction, and it changes the validity you are buying: “A 1926 or 1949 permit lasts for 12 months. A 1968 permit lasts for 3 years or until your UK driving licence expires, whichever comes first.” The UK sells both. You choose the convention at the counter, and the two options carry materially different validity periods.

Where you need one, where you don’t

The honest state of this topic is that requirement levels differ per country, and the same country can treat different licence nationalities differently. Japan is the clearest example — six named countries get a translation route that the rest of the world does not.

Destination	What the official source says
New Zealand	No IDP needed on a valid overseas licence. 18 months for cars, 12 for trucks and motorcycles — dropping to 12 for cars from 1 November 2026. If the licence is not in English you must also carry an accurate English translation or an IDP; an IDP may be expired by up to 6 months, but you must still carry your current overseas licence.
Japan	Holders of licences from Switzerland, Germany, France, Belgium, Monaco or Taiwan may drive with a JAF Japanese translation attached to the original, for one year from entry. All other countries need a 1949 Geneva IDP. 1968 Vienna IDPs are not valid.
Namibia	Foreign visitors need a full valid licence from their home country. If the licence is not in English, an IDP is also required. The mission’s guidance tells drivers to carry their licences and permits, registration and insurance documents, and notes that checkpoints in and around Windhoek may ask.
Thailand	A foreign licence is not accepted. The US Embassy quotes the rule directly: “An international driving license is accepted as long as it is valid, but a foreign license is not accepted in Thailand.” Applications run through the Department of Land Transport.
Italy	No IDP needed — a sworn translation of your licence does the job. ACI: you can drive in Italy for one year on your foreign licence, provided it is accompanied by its “traduzione giurata” (sworn translation). Italy also sells both permit models: MIT states the 1949 Geneva permit is valid 1 year and the 1968 Vienna permit 3 years, “sempre nei limiti di validità della patente italiana posseduta”.
Australia	No IDP needed if your licence is in English. South Australia’s Department for Infrastructure and Transport lists “a current licence issued in another country that is written in English” as sufficient on its own. If it is not in English you need an English translation or an IDP, valid 12 months. Note there is no single federal rule — these are state pages.

One caveat that applies to every row above. Only Japan (1949 only) and Thailand state a convention first-party. For Namibia, New Zealand and Australia the convention is not named by the authority, so we have not asserted one. Italy’s Ministry makes the hazard explicit on its own page: “Alcuni paesi accettano entrambi i modelli, altri solo uno dei due” — some countries accept both models, others only one. Check the issuing country’s convention against the destination’s rule before you assume a permit you already hold will work.

What an IDP actually costs

The document is cheap. That is the least of it.

Where you are	Cost	Validity
UK (GOV.UK)	£5.50	12 months for a 1926 or 1949 permit; 3 years or until your licence expires for a 1968 permit
US (usa.gov)	AAA issues for a $20 permit fee; a photo fee and shipping may apply	One year, and it cannot be renewed

The UK sells a 1968 permit that lasts three years for £5.50, which makes it the cheapest long-validity IDP in this comparison by a wide margin.

One practical note if you are buying in the US: AAA states that IDPs may not be issued more than six months in advance of the date you intend to use them, so an early application is wasted money. And an IDP is always issued by the country that issued your licence — another country cannot issue one to go with a US licence. South Australia’s transport department states the same rule for arrivals: “Your international driving permit (IDP) must be issued by the same country that issued your driver’s licence.”

On the US side there are two authorized issuers, not one. The US government names both the American Automobile Association (AAA) and the American Automobile Touring Alliance (AATA) as the two organizations authorized by the Department of State to issue IDPs. Most of what you will read online still mentions only AAA. The same page carries a warning worth taking seriously: “Beware of other websites that claim to issue international driver’s licenses or IDPs. Many are fraudulent and may try to scam you out of money or personal information.”

An IDP is not a licence

This is the part that gets lost, and it is the part that matters most at a traffic stop.

Read the underlying treaty. Article 24 of the 1949 Geneva Convention says a Contracting State “shall allow any driver admitted to its territory” who holds a valid domestic permit to drive without further examination — and then, at paragraph 2, carves out the country’s discretion:

A Contracting State may however require that any driver admitted to its territory shall carry an international driving permit conforming to the model contained in annex 10, especially in the case of a driver coming from a country where a domestic driving permit is not required or where the domestic permit issued to him does not conform to the model contained in annex 9.

Two things follow from that wording. First, an IDP requirement is a per-country decision, not a treaty default — “may require” is doing real work in that sentence. Second, the treaty’s own framing treats the domestic permit as the thing that actually confers the right to drive; the international permit is a standardized-format document layered on top of it.

That is why every authority we checked tells you to carry both. New Zealand’s position is unusually precise: the IDP “can be current or expired up to 6 months, but you must also carry your current overseas licence with you.” An expired permit is tolerable in that one jurisdiction, and only there. Everywhere else, treat the pair as a unit.

The bottom line

If you are driving in New Zealand, you very likely do not need an IDP at all, and you need to know that your window shrinks on 1 November 2026. If you are driving in Japan, check the convention before you buy — a 1968 Vienna permit will not work there, and six European countries plus Taiwan can use a JAF translation instead of any permit. If you are renting a car anywhere, the rental desk may still ask to see an IDP regardless of what the law requires, which is a commercial condition rather than a legal one, and worth arguing about if it catches you out.

Whatever you carry, carry the original licence too. Every official source we checked says the same thing, and it is the one rule on this page that has no exceptions.

See also: Namibia → (the car is the transport there, and the licence rule matters) · New Zealand → · Japan → · Thailand → · hidden travel costs → · travel insurance →