Normally when travelling to the United States you would need a visa in order to enter. Visas are not a requirement of every foreign country. Entering a country without a valid visa or visa exemption may result in detention and removal (deportation or exclusion) from the country. A cautionary note: if at present your particular plans for your trip to Japan are not yet clear, you may be tempted to enter Japan using a visa-free stay as you keep your options open.
If you are a US citizen and hold a valid US passport, you may be eligible for an Electronic Travel Authority (ETA) ETAs are free of charge and most are issued automatically. It is also imperative to have valid medical insurance to enter the country, even on a tourist visa.
The visa requirements described here only apply when travelling on your Australian passport If you’re a dual national and choose to travel on your other passport, you’ll need to check the visa requirements for that nationality. These visas generally preclude permanent employment , for which a work visa would be required.
If the individual is from any visa exempt country and is granted a work permit or a study permit, he or she is automatically issued an eTA when he or she accepts the work or study permit application. Please be sure to select the country which issued your travel document.
Some other countries, e.g. Thailand, allow visitors who arrive by land from neighbouring countries a shorter length of stay than those who arrive by air. Visas: If a visa is required and cannot be obtained upon arrival in your destination, you should make arrangements with the appropriate foreign consular representative, allowing enough time for mailing and processing.