If you're visiting the United States from another country — or you're a US resident planning to drive abroad — you've probably come across the term International Driving Permit (IDP). Whether one is required, helpful, or completely unnecessary depends on a combination of factors: where you're from, how long you're staying, which state you're driving in, and what your home license says.
Here's how it actually works.
An IDP is not a standalone license. It's a translation document — a standardized booklet, recognized under the 1949 Geneva Convention on Road Traffic, that presents your existing driver's license information in multiple languages. You must hold a valid license from your home country to use one. Without that underlying license, an IDP is worthless.
IDPs are issued by authorized organizations in your home country — not by the US government, and not by any state DMV. If you're already in the United States and thinking about getting one here, that's not how it works. You get an IDP before you travel, from your home country.
In the US, AAA and the American Automobile Touring Alliance (AATA) are the two organizations authorized to issue IDPs to US residents who plan to drive abroad.
This is where it gets nuanced. No federal law requires a foreign visitor to carry an IDP to drive in the United States. Whether one is needed — or strongly recommended — depends on the state and the situation.
Most states allow visitors from other countries to drive legally using their valid foreign driver's license, at least for a limited period. That period varies. Some states permit it for the duration of a tourist visa. Others set a fixed window — commonly 30 to 90 days — regardless of visa status.
The practical role of an IDP: if your foreign license is written in a language other than English, a law enforcement officer or rental car agent may not be able to read it. An IDP translates your credentials into a format they can understand. In that sense, it functions as a supplement to your foreign license, not a replacement.
Rental car companies often have their own requirements, which may differ from what state law technically mandates. Some require an IDP for renters whose licenses aren't in English or Roman script, regardless of what the state says.
There's no uniform national answer. States set their own rules, and those rules vary considerably.
| Situation | Typical Treatment |
|---|---|
| Tourist or short-term visitor | Foreign license generally accepted; duration varies by state |
| Long-term visa holder or new resident | May be required to obtain a state license after a set period |
| License from a country with a reciprocity agreement | May have a smoother transfer process |
| License not in English or Roman script | IDP strongly recommended as a companion document |
Once someone establishes residency in a US state, the rules change significantly. Most states require new residents to obtain a local driver's license within a defined window — often 30 to 60 days, though this varies. At that point, continuing to drive on a foreign license alone may not be legal under state law.
If you hold a US driver's license and plan to drive in another country, an IDP may be required — depending on that country's laws. Many countries that are signatories to the Geneva or Vienna Conventions on Road Traffic require or recommend an IDP for foreign drivers.
US residents obtain IDPs through AAA or AATA before traveling. The permit is valid for one year from the date of issue and must be accompanied by your valid US license at all times when driving abroad.
Whether an IDP matters — and in what way — depends on several overlapping factors:
No single answer covers everyone here. A Canadian visitor driving through Michigan faces a different situation than a visitor from Japan renting a car in California, or a Brazilian national who has just moved to Texas on a work visa. Each state DMV publishes its own rules for how long a foreign license is valid, when a local license is required, and what documentation is needed to convert a foreign license to a state-issued one.
The same is true in reverse — if you're a US resident preparing to drive in another country, that country's consulate or transportation authority is the right source for what they specifically require.
The IDP sits in an interesting space: often not legally mandatory in the US for short-term visitors, but frequently practical, and sometimes required by private rental companies or specific states in specific circumstances. What applies to your situation depends on where you're from, where you're going, how long you're staying, and what your license looks like. 🗺️