Tax on Gambling Winnings in Thailand

Taxes on gambling winnings in Thailand: the short answer

If you win money gambling in Thailand, what happens next depends almost entirely on what you were playing. The country's legal gambling scene is small: the state lottery and horse racing at state-licensed racecourses are the main exceptions to a broad ban on betting, and the tax treatment follows that split⁴.

Winnings from the Thai government lottery are fully exempt from income tax under the Revenue Code, so you do not declare them in your annual tax return. The only charge is a stamp duty of 1 baht for every 200 baht of prize money, taken off the top when you claim². Charity lottery prizes work differently: 1 percent income tax is withheld at source before the money reaches you¹. And winnings from online casinos, including sites operated from abroad, fall under Section 40 (8) of the Revenue Code as assessable income, which means they belong in a tax declaration².

For foreign visitors, the practical side is simple: anyone can buy Thai lottery tickets from licensed vendors inside the country, and foreigners claim prizes by presenting a passport or government-issued ID along with the winning ticket⁵. If you take substantial winnings out of the country, you may need to declare the funds at customs depending on the amount⁵.

Which winnings count as assessable income under Section 40 (8)

Section 40 (8) of the Revenue Code is the catch-all category for income that does not fit the numbered lists above it, and online casino winnings land there. Thai players who win on online casinos, including those run by foreign operators, are taxed on that money as assessable income².

There are two ways to work out the deductible expenses against this income. The first is to deduct actual and necessary expenses, meaning you count what you genuinely spent to earn the winnings. The second is a lump-sum deduction at a set rate. Which route applies depends on the income type, since Section 40 (8) covers everything not listed in items (1) through (43)².

The important distinction is between the government lottery and everything else. Government lottery winnings are exempt from income tax entirely, so Section 40 (8) never touches them². Charity lottery prizes are handled at source with the 1 percent withholding, so the tax is settled before you see the money¹. Online casino winnings are the category where you, as the player, have to do the declaring yourself².

Government lottery: stamp duty and withholding rates

The Thai government lottery draws twice a month, on the 1st and 16th, with tickets sold at 80 baht each in the single-ticket format used since the draw of September 1, 2017⁶. A full set of tickets carries 14,168 prizes totaling 48,000,000 baht, and if a set does not sell out, each prize is reduced proportionally¹.

The prize ladder for the six-digit game looks like this⁷:

None of this is subject to income tax. What is deducted instead is stamp duty, at a rate of 1 baht of prize money for every 200 baht, or any fraction of 200 baht¹. The duty is taken off before the prize is paid, so the check or transfer you receive is already net⁸.

The rate has a history. Before a 2018 amendment to the Revenue Code, lottery winnings carried a 0.25 percent stamp duty; the amendment raised the figure, and the rate now in force at the Government Lottery Office works out to 0.5 percent⁹. The Revenue Department's own guidance illustrates it with a 2,000 baht prize, where the stamp duty is 10 baht, equal to 0.5 percent of the winnings¹⁰.

Charity lottery: 1 percent withholding at source

Charity lottery prizes are taxed differently from government lottery prizes. When you claim a charity lottery prize, income tax is withheld at source at a rate of 1 percent of the prize money, and that amount is remitted to the Revenue Department¹. The Government Lottery Office's annual reports confirm the same arrangement: 1 percent of the charity lottery prize is collected from prize recipients and passed on¹¹.

The practical effect is that you never have to declare charity lottery winnings yourself. The tax is settled at the counter when you claim, and the money you receive is yours¹. An academic summary of the special charity lottery rules gives the same figure, 1 percent of the prize money withheld when the prize is claimed¹³.

Charity lottery results are checked against the government lottery results of the same draw period, so the two games run on the same draw dates¹.

A related case worth knowing: commercial lucky draws, the kind run by shops and brands as promotions, face a different rule. If the prize is valued at more than 1,000 baht, it is subject to 5 percent withholding tax deducted from the prize's value¹⁴. So a lucky draw at a mall and a charity lottery ticket are not taxed the same way, even though both feel like small-stakes games.

How to claim a lottery prize: process, banks and payment methods

Prize money is paid to whoever walks in holding the winning ticket, so the ticket itself is the claim¹. Here is how the process works at the Government Lottery Office.

First, you sign the back of every winning ticket and receive a queue card. Your national ID card or official government-issued card details are recorded, and when your turn comes, the ticket examiner verifies a first-prize ticket within about 5 minutes⁶. Before payment, you check the payout details on screen, including your name, the prize amount and the tax and levy deductions, and confirm with an electronic signature⁶.

Payment depends on the size of the prize:

• Prizes up to 20,000 baht are paid in cash¹¹.
• Prizes of 20,000 baht and above are paid by check, drawn on Krung Thai Bank, with the stamp duty already deducted¹⁰.
• Bank transfer is also available, and you will need to give your bank name and account number. Inter-bank transfers are limited to 2,000,000 baht per transaction⁶.

At the Government Lottery Office's ground-floor counter, prize money is credited to your bank account or paid as a Krung Thai Bank check¹⁶. You can also claim through bank agents: the Bank for Agriculture and Agricultural Cooperatives, Krung Thai Bank and the Government Savings Bank all act as payment channels for the office¹⁶. The office's annual report lists the Bank for Agriculture and Agricultural Cooperatives, the Government Savings Bank and Krung Thai Bank as its prize-payment banks¹¹.

Foreigners claim the same way, presenting a passport or government-issued ID along with the winning ticket⁵. Winners can generally choose to receive the prize in cash or by check, with checks used especially for larger amounts⁵.

The office handles a large volume of claims, so it runs an online queue booking system with a capacity of 65,000 tickets per day on weekdays, split between a morning window from 7:30 to 12:00 and an afternoon window from 12:01 to 15:00¹¹.

For the digital lottery sold through the Government Lottery Office's app, the process is simpler: the app notifies the winner, who can choose to have the prize transferred to a linked Krung Thai bank account or claim it in person at the office¹⁷. If you win with a deposited paper ticket paid by check or bank transfer to Krung Thai Bank, payment is made within 3 business days after the office has verified the tickets and found no obstacle to payment⁸.

Claim deadlines: 2 years for government, 10 years for charity draws

The two lottery types have very different clocks. Government lottery winners have the right to claim prize money within 2 years of the draw date; after that, the money is transferred to state revenue¹. The Revenue Department's guidance says the same: claim within 2 years from the draw period¹⁰.

Charity lottery winners get much longer: 10 years from the draw date, after which unclaimed prizes likewise go to the state¹. The Government Lottery Office's support pages set out both windows side by side, 2 years for the government lottery and 10 years for the charity lottery¹⁸.

Two years is generous by lottery standards, but it is worth checking old tickets rather than binning them after a few months. A first-prize ticket from a draw a year ago is still worth 6,000,000 baht minus stamp duty¹.

Online casino winnings and foreign operators

Online gambling sits in an awkward place in Thailand. There are no online casinos approved or regulated by the Thai government, but offshore sites are accessible in practice, and many residents gamble online with foreign operators¹⁹. A research paper on the Thai online gambling market describes how the agent system works: some Thai agents act as brokers for foreign gambling websites, receiving usernames and passwords to distribute to Thai players and earning commission calculated as a percentage of what their customers bet, while others are customers of the foreign sites themselves who receive credit and create child websites to distribute it to Thai gamblers²⁰.

For tax purposes, the origin of the winnings does not change the answer. Winnings from online casinos, including foreign online casinos, are assessable income under Section 40 (8) of the Revenue Code, and the player is the one responsible for declaring them². The deduction rules described earlier, actual and necessary expenses or a lump-sum rate, apply to this income².

The scale of the untaxed online market is enormous. Former prime minister Thaksin Shinawatra was reported as saying that taxing online gamblers at 20 percent would bring in 100 billion baht per year, a figure that gives a sense of how much money flows through unlicensed channels²¹. Press reporting on the online gambling explosion notes that offshore betting sites offer incentives such as credit to Thai players²¹. None of that changes the position of a player who wins: the winnings are taxable income under the Revenue Code².

What the Entertainment Complex Bill proposes: 17 percent on gross gaming revenue

The tax picture for casinos is about to change if the Entertainment Complex Bill becomes law. The bill would legalize Integrated Entertainment Complexes with casinos, and a draft was anticipated for enactment in early 2026²². The headline tax figure is a 17 percent tax on gross gaming revenue³, a rate echoed across reporting on the plan: earnings would be subject to a 17 percent tax²³, and gaming taxes are expected to be set at 17 percent²⁴.

Two things to note about that number. First, it is a tax on the operator's gross gaming revenue, not a tax on individual players' winnings, so it sits alongside the existing rules rather than replacing them³. Second, the bill is a land-based plan: it did not address online gambling at all²⁵.

The bill also sets entry conditions. The minimum gambling age would be 20³, and individuals under 20 would be prohibited from entering the casino venues²⁶. Earlier reporting on the same plan suggested Thai gamblers would need at least 500,000 baht in bank accounts to be allowed to play, while foreign visitors could access the venues²⁷. An earlier panel proposal even floated the idea of one casino complex for each region of the country²⁸.

What the law does not cover

The Gambling Act of 1935 (B.E. 2478) remains the foundational law, and it bans nearly every form of gambling outright, carving out only the state lottery and horse racing at state-licensed racecourses²⁹. The act does not cover online gambling directly, but it is read as banning nearly all wagering activities, which is why no online casinos are licensed in Thailand¹⁹. The act also contains provisions for taxing some types of gambling under sections 16 and 16 bis³¹, and the underground three-digit and two-digit lottery, known as huay tai din, is subject to gambling tax under sections 16, 16 bis and 17 of the act³².

The Entertainment Complex Bill, for all it changes on land, leaves the online world untouched: it did not address online gambling at all²⁵. So even after the bill passes, winnings from offshore online casinos remain in the Section 40 (8) category described earlier, not in any new casino tax regime².

The old law itself has not changed. The 1935 Gambling Act still prohibits all types of gambling except the government lottery and domestic horse racing²⁹, and the Entertainment Complex Bill did not address online gambling at all, covering land-based venues only. None of this creates a new tax on players; it simply underlines that the only gambling products with a settled, published tax treatment are the government lottery, the charity lottery and, for those who play anyway, taxable online winnings.