Japan takes a stricter line on online casinos than most countries. Playing at one is a criminal offence even when the site is licensed abroad, and since September 2025 it is also illegal to advertise or steer people in Japan towards online casinos. This guide explains what the law says, which forms of betting are legal, how the coming integrated resort casinos fit in, how winnings are taxed and where to get help.
Are online casinos legal in Japan?
No. The Penal Code makes gambling a crime unless a specific law allows it. Article 185 covers simple gambling, punishable by a fine of up to 500,000 yen, and Article 186 covers habitual gambling and running a gambling business, with prison terms. No Japanese law allows online casinos, so playing at one from Japan is illegal.
A licence from Cura莽ao, Malta or any other country does not change this. Japanese police and the National Police Agency have stated clearly that using an overseas online casino from Japan is illegal gambling, and players have been arrested and prosecuted for it.
The National Police Agency published a survey in 2025 that estimated about 3.37 million people in Japan had used online casino sites, which is one reason the government has stepped up enforcement and public warnings.
Is it illegal to advertise online casinos in Japan?
Yes. An amendment to the Basic Act on Gambling Addiction Countermeasures took effect on 25 September 2025. It prohibits setting up or running online casino sites for people in Japan, and it prohibits content that encourages people in Japan to use online casinos, including those operating legally in other countries.
The ban covers banner ads, ranking and comparison sites, affiliate links and social media posts that point people to online casinos. Platforms and website administrators can be told to remove such content. If you see a site promoting online casinos to Japanese users, that content is itself unlawful under the amended Act.
Which forms of betting are legal in Japan?
Japan allows a limited set of public betting run under specific laws and government oversight. Many of these can be played online through official sites and apps that require a Japanese bank account and identity checks.
- Horse racing, through the Japan Racing Association and local government racing
- Keirin bicycle racing
- Boat racing
- Auto racing
- Takarakuji public lotteries
- Sports promotion lotteries such as toto and WINNER
What about the planned casino resorts?
The Integrated Resort Implementation Act of 2018 allows a small number of land-based casinos inside large integrated resorts with hotels, conference space and entertainment. So far only one project has been approved, in Osaka. These casinos will be supervised by the Casino Regulatory Commission, with strict entry limits, ID checks and an entry fee for Japanese residents.
The integrated resort system does not permit online casino games. Even once the Osaka resort opens, online casinos will remain illegal in Japan.
What are the risks of using an online casino from Japan?
The most serious risk is legal: you can be investigated and prosecuted for gambling, and winnings and records of your payments can be used as evidence. Beyond that, an offshore site offers no protection that a Japanese authority can enforce.
- Criminal liability for gambling under the Penal Code
- Withdrawals refused or delayed, with no Japanese body able to help
- Bank accounts frozen when payments are linked to illegal gambling
- Payment agents and e-wallets that disappear with deposited funds
- Personal data and ID documents sent to unknown companies abroad
- Debt problems, since losses can build quickly with no spending controls
How are gambling winnings taxed in Japan?
Winnings from legal betting such as horse racing are generally treated as occasional income (ichiji shotoku). A special deduction of up to 500,000 yen applies to the total of your occasional income for the year, and half of the remaining amount is added to your taxable income. Lottery prizes from takarakuji and toto are tax free.
Money won through illegal gambling does not escape tax, and the fact that it came from an illegal activity can create further legal problems. If you are unsure how to report income, ask your local tax office or a licensed tax accountant.
How can you limit or stop your own betting?
The official public racing operators offer access restriction schemes. You can ask to have your own online betting account restricted, and in some cases family members can request this too. Pachinko and pachislot halls also run self-reporting programmes that let you set limits on your spending and time.
None of these schemes reach offshore online casinos, which is another reason they carry more risk.
Where can you get help with gambling in Japan?
Japan does not have a single national gambling helpline. Instead, every prefecture and major city has a mental health and welfare centre (seishin hoken fukushi sentaa) and public health centres that offer free consultations on gambling problems for you and your family, often in person or by phone on weekdays. Search for your prefecture's centre on its official website.
If gambling has led to debt, the Japan Legal Support Center (Houterasu) can explain your options on 0570-078374, and the consumer hotline on 188 can connect you with a local consumer affairs centre if you have been cheated by a website. Self-help groups such as Gamblers Anonymous and family support groups also meet across Japan.
Myths vs facts
- Myth: An online casino licensed abroad is legal to use in Japan.
- Fact: A foreign licence does not change Japanese law. Playing at an online casino from Japan is illegal gambling under the Penal Code.
- Myth: Only the operators get in trouble, not the players.
- Fact: Players in Japan have been arrested and prosecuted for using online casinos. Simple gambling carries a fine of up to 500,000 yen.
- Myth: The new casino resorts will make online casinos legal.
- Fact: The integrated resort law only allows land-based casinos inside approved resorts. Online casinos remain illegal.
- Myth: Gambling winnings are always tax free.
- Fact: Lottery and toto prizes are tax free, but winnings from public racing are taxed as occasional income above the annual special deduction.
Before you claim
- Online casinos are illegal in Japan, even with a foreign licence
- Legal betting is limited to official public racing, lottery and toto sites
- Access restriction available on official racing accounts
- Local mental health and welfare centre found for your prefecture
- Houterasu (0570-078374) and consumer hotline (188) saved