Online casino gambling in Japan is illegal - full stop. There is no licensing regime for online casinos, and accessing an offshore site (even one legally licensed abroad) is a crime under the Japanese Penal Code, whether you pay by card or crypto. The only lawful online betting is state-run: horse, bicycle, boat and auto racing, the national lottery, and football pools. In 2025 a record number of players were caught, and a September 2025 law tightened advertising and promotion rules. If you’re in Japan, treat every online casino - crypto ones included - as off-limits.

Japan bans gambling by default under Penal Code Articles 185 (simple gambling) and 186 (habitual gambling), with only narrow, specifically legislated exceptions. Online casinos are not one of them. Prosecutors and courts treat playing at an offshore online casino from within Japan as illegal gambling even if the operator is licensed in Curacao, Malta or elsewhere, because the offence is committed where the player sits.

This is not a theoretical rule. Japanese police took enforcement action against a record 317 people for online gambling in 2025 - the highest since 2018 - of whom 196 were arrested specifically for using online casinos (up about 38% on 2024). Penalties under the Penal Code: simple gambling is a fine of up to ¥500,000; habitual gambling can mean up to three years in prison.

The 2025-2026 crackdown

Japan sharply escalated in 2025:

  • An amendment to the Basic Act on gambling-addiction countermeasures took effect 25 September 2025, banning the launch of new online-casino services and prohibiting advertising and promotion of illegal online gambling - including affiliate rankings, review platforms and celebrity endorsements. The amendment carries no direct penalty of its own, but obliges platforms to remove such ads and strengthens public-awareness duties.
  • Affiliate/review promotion of offshore casinos was targeted, and Japan made an arrest tied to an online-casino advertising platform.
  • The National Police Agency asked eight licensing jurisdictions - Curacao, Malta, Isle of Man, Gibraltar, Anjouan, Costa Rica, Georgia and Canada - to help identify operators, block Japanese access and share payment-network intelligence.

Licensed vs offshore operators

There are no licensed online casinos in Japan. Legal, state-run online betting exists only through official channels:

ProductOperatorOnline?
Horse racingJapan Racing Association (JRA) / NARYes (official apps)
Keirin (cycling)JKA-administered public bodiesYes
Boat racing (kyotei)Local public bodiesYes
Lottery (takarakuji)Mizuho Bank on behalf of prefecturesYes
Toto / BIG football poolsJapan Sport CouncilYes
Casino (land-based)MGM Osaka (Osaka IR KK) - opens ~2030No online play

Japan’s first casino, MGM Osaka, broke ground in April 2025 for a roughly 2030 opening under the national Casino Regulatory Commission, with strict entry controls: a ¥6,000 entrance fee (¥3,000 national plus ¥3,000 municipal) and ID check valid for 24 hours for residents, plus visit-frequency caps. It is a land-based integrated resort - not online gambling.

Payments: what the law targets

Because offshore play is illegal, there are no sanctioned rails. Reporting indicates players who break the law have used cards, e-wallets and increasingly crypto - which is exactly why the government is squeezing these channels. Many banks and card networks block gambling-related transactions, and enforcement now targets payment agents who process bets for a fee. Crypto is legal to own in Japan but confers no legality on gambling: since September 2024 police have used a crypto tracking tool to trace payments and arrest players.

Tax on winnings

  • Lottery (takarakuji): tax-free by statute (Winning Money Vouchers Act).
  • Public-race winnings (horse etc.): taxable, usually as ‘occasional (temporary) income’, and reportable to the National Tax Agency - you must declare net winnings above roughly ¥500,000.
  • Offshore online-casino winnings: proceeds of an illegal act - not a legitimate, declarable category, and the underlying activity is itself criminal.

Safer gambling and help

If gambling is causing harm, free and confidential support is available. The Society Concerned about Gambling Addiction (SCGA) operates a consultation line (070-4501-9625); Gamblers Anonymous Japan runs meetings nationwide (gajapan.jp). A directory is at findahelpline.com. Japan’s Basic Act on Countermeasures Against Gambling Addiction (2018) funds public education, specialist medical care and counselling.

18+ only. Gambling should never be a way to make money or escape problems. If it stops being fun, stop - and reach out for help.

Sources