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Check with the embassy for passport validity rules.

A return ticket or a ticket to your next destination may be requested at check-in or on arrival, showing departure before the permitted stay ends

You should have No fixed amount is officially published, immigration officers may ask for bank statements, credit cards, cash, or a sponsorship letter as evidence of sufficient funds for the stay.

Visit Japan Web, the official Digital Agency portal bundling immigration entry information, customs declaration, and tax-free shopping registration into one QR code, is available and speeds up arrival, but is explicitly optional, paper disembarkation and customs cards are still handed out on incoming flights and accepted at every Japanese airport

Check with the embassy for overstay penalties.Overstaying is punishable under the Immigration Control and Refugee Recognition Act by imprisonment of up to 3 years, a fine of up to JPY 3,000,000, or both, not a per day rate. Deportation is common in practice, with re-entry barred for at least 5 years from the date of deportation

Declare cash above JPY 1,000,000 (or equivalent) combined across all cash and monetary instruments carried, including foreign currency, yen, and traveler's checks, confirmed directly against Japan Customs regulations; travelers bound for North Korea face a lower JPY 100,000 threshold instead.

In principle non-extendable; an extension is only granted for illness, natural disaster, or a similarly unavoidable circumstance, applied for at a Regional Immigration Bureau before the permitted stay expires, and approval standards are described as very strict, not a routine option

The commonly cited recommendation of 6 months of passport validity beyond arrival is a practical safety margin many airlines and travelers still follow, not an official Japanese government requirement, the actual rule is only that the passport remain valid for the length of the stay itself

Always confirm with the official embassy or consulate before you fly.