How Taxable Winnings Are Calculated

Gross, net and one win: the three ways winnings are counted

When a tax office looks at your gambling win, it has to answer one question before anything else: what number counts as "the winnings"? Across Asia there are three main answers, and they can produce very different tax bills from the same betting results.

The gross prize. Some systems simply take the amount printed on the winning ticket or paid at the cage. China works this way for lottery: a win is "incidental income" and the taxable amount is the full value of each winning, with no subtraction for what you spent on tickets³. Vietnam does something similar with a threshold: the taxable income is the part of the prize above a set amount per win, taxed at a flat 10%, and the calculation applies to both residents and non-residents⁴.

Net winnings. India takes the opposite approach for online gaming. Your taxable number is not any single prize but the balance across your whole account: total withdrawals minus total deposits. If you deposited INR 2,000 and withdrew INR 3,000, your net winnings are INR 1,000, and 30% of that, INR 300, is withheld². A big prize that you lose back before withdrawing never becomes taxable at all.

One win, defined. A third question is what counts as a single win when you hold several tickets or place several bets. China answers this directly for lottery: for computer lottery, all prizes the same person wins in the same draw of the same game are added together and treated as one winning income, while for instant scratch cards the prize of one ticket is one win³. This matters because the CNY 10,000 exemption applies per win, not per ticket.

A few places keep it simpler still. Singapore does not tax betting or lottery winnings at all, treating them as windfalls, and you do not declare them in your income tax return⁵. South Korea takes the opposite view: refunds from horse racing, cycling, boat racing, bullfighting and sports promotion betting tickets are other income under the Income Tax Act, regardless of legality⁶. And in the Philippines, a horse racing winner pays 10% of the winnings, calculated on the actual amount paid for every winning ticket after deducting the cost of the ticket⁷.

The rest of this page walks through the three big systems in detail: Japan's temporary income calculation, India's net winnings regime, and China's single-win rules.

Japan: public racing payouts as temporary income

Payouts from Japan's four public sports, horse racing, keirin, auto racing and boat racing, are in principle classified as temporary income (一時所得)⁸. The same classification covers sweepstakes and raffle prizes, unless they come from your business⁹.

The practical consequence is that a payout is not taxed on its own. It goes into a calculation that nets off what you spent to earn it and applies a special deduction, and only then does tax apply, and only if the total for the year is large enough. A final tax return may be required when you receive payouts, so it is worth knowing the mechanics even if most bettors never file one⁸.

The scale of tax on a genuinely large win gives a sense of the stakes. On a JPY 100 million payout, the winner keeps about 78.2 percent of the prize, an effective tax burden of roughly 21.8 percent¹⁰. The Ministry of Internal Affairs and Communications table showing these figures covers public racing payouts; lottery prizes themselves are tax free¹⁰.

If you do file, the entry method is straightforward: in the National Tax Agency's tax return preparation tool, select "temporary" (一時) on the income selection screen and enter the payout under temporary income⁸. The JRA's own betting guide notes that payout winnings can be subject to comprehensive taxation, and keirin's guidance similarly tells winners that a tax return may be required and to consult a local tax office if unsure¹¹.

Temporary income: how the calculation works

The formula is short:

For public racing payouts, the "costs paid to obtain the income" means the purchase cost of the tickets that won¹. The special deduction is capped at JPY 500,000 per year, not per win¹².

Then comes the part that surprises people: only half of the result is taxed. Temporary income is calculated by adding half of the income amount to your other income, such as employment income, to get total income, and the tax is then computed on that⁹. In other words, the special deduction and the halving together mean a great deal of modest betting income never produces tax.

A worked example shows the shape of it. Suppose over a year you collect JPY 1,500,000 in payouts, and the winning tickets cost JPY 100,000:

• Gross income: JPY 1,500,000
• Minus cost of winning tickets: JPY 100,000
• Minus special deduction: JPY 500,000
• Temporary income: JPY 900,000
• Amount added to your other income: half of JPY 900,000, or JPY 450,000

That JPY 450,000 is what actually flows into your tax calculation, stacked on top of your salary or other income at your marginal rate.

One edge case is worth knowing. The National Tax College's research journal discusses a bettor whose own know-how yields an expected recovery of over 100%: in that unusual case the winnings could be classified as miscellaneous income rather than temporary income, which is taxed differently and without the halving benefit¹³. For an ordinary recreational bettor, temporary income is the default treatment.

Deductible costs: winning tickets only

The rule that catches most people is which costs you can subtract. Only the purchase cost of the tickets that actually won can be deducted. The cost of losing tickets cannot be deducted¹⁴.

This is harsher than it sounds when you consider how most people bet. If you buy twenty tickets at JPY 200 each and one pays JPY 50,000, your deductible cost is JPY 200, not JPY 4,000. The nineteen losers are, for tax purposes, simply gone. The same rule appears in the National Tax Agency's own guidance for public sports betting: subtract the purchase cost of winning tickets, then the special deduction of up to JPY 500,000, but losing ticket costs cannot be subtracted¹⁴.

The research literature confirms the same reading for horse racing: only the amount paid to purchase the winning ticket counts as a directly necessary expense for occasional income¹³.

Not every country is this strict. The Philippines' horse racing winnings tax is based on the actual amount paid for every winning ticket after deducting the cost of the ticket, so the stake comes out before the 10% applies⁷. Vietnam goes further and takes the entire prize value above the threshold as the taxable base, before deducting any expenses¹⁵. If you want the broader picture across the region, see deducting gambling losses from winnings.

Because only winning ticket costs are deductible, the records the tax office asks you to keep are precise. For each payout, note the date, venue and race; the amount you received; and the amount you bet on that payout¹. Those three figures are exactly what the temporary income calculation needs.

Filing thresholds: when no return is needed

Most recreational bettors in Japan never file a gambling return at all, because the thresholds are generous.

For people with salary income, no final return is required if your total temporary income for the year does not exceed JPY 900,000. The reason is arithmetic: tax is computed on half of the balance after the JPY 500,000 special deduction, and for salary earners the return requirement already caps other income excluding salary at JPY 200,000. Once the JPY 500,000 special deduction comes off JPY 900,000, JPY 400,000 remains, and half of that amount, JPY 200,000, sits exactly at that cap¹⁶. An earlier, stricter version of the guidance put the figure at JPY 500,000, so if you see that number quoted elsewhere, it is out of date¹⁶.

Elsewhere in the region, thresholds work differently:

• South Korea applies its test per bet, not per year. For Toto sports betting, no tax is charged if the winning odds are 100x or less and the refund is KRW 2,000,000 or less, or if the refund is KRW 100,000 or less regardless of odds¹⁷. For boat racing, refunds of KRW 100,000 or less per individual bet at a payout rate of 100x or less are not taxed; above that, other income tax of 20% plus resident tax of 10% of that amount is withheld before payout¹⁸.
• China exempts single lottery winnings up to CNY 10,000 entirely, and the lottery institution handles the paperwork: it files a tax-exempt record for computer lottery single wins over CNY 3,000 up to CNY 10,000, and files tax on single wins over CNY 10,000¹⁹. Winners claiming computer lottery payouts over CNY 3,000 must have their real-name identity and redemption information registered²⁰.
• Singapore requires nothing: winnings are not taxable and need not be declared⁵.

For more on where the lines sit across the region, see tax-free prize thresholds.

India: 30% TDS on net winnings at withdrawal

India runs the clearest example of the net winnings approach. All real money gaming apps must deduct tax at 30% on your net winnings at the time of withdrawal, or on March 31, the end of the financial year, whichever comes first².

Net winnings means total withdrawals minus total deposits. The operator's own examples show how it works in practice:

• Example 1: You deposit INR 2,000 and withdraw INR 3,000. Net winnings are INR 1,000, tax of 30% is INR 300, and you receive INR 2,700².
• Example 2: You have withdrawn INR 5,000 in all, INR 3,000 on an earlier occasion and INR 2,000 now, against total deposits of INR 6,000. Net winnings are negative, minus INR 1,000, so no tax is deducted and the full INR 2,000 of the current withdrawal is paid out².
• Example 3: Over time you withdraw INR 9,000 in total against deposits of INR 8,000. Total net winnings are INR 1,000, but because INR 300 was already deducted on an earlier withdrawal, no further tax is taken and you receive INR 4,000².

The key insight from example 3 is that the calculation is cumulative. Tax is charged once on each rupee of net winnings, not every time you cash out. If tax has already been deducted on positive net winnings at a withdrawal, it is not deducted again on the same net winnings at year end².

The legal basis is the Income Tax Act, 2025. Section 194 imposes a 30% tax on net winnings from online games, applying to both skill-based and chance-based games, and also requires 30% to be deducted at the time of payment on winnings from lotteries, horse races, card games, gambling or betting exceeding INR 10,000. Section 393(3) mandates the withholding on online game winnings²¹.

You do not have to take the operator's word for the arithmetic. The tax calculation can be checked on the withdrawal page of your gaming account². For the mechanics of how withholding works generally, see withholding tax on winnings.

India: the annual reset and refunds for negative net winnings

The net winnings calculation does not run forever. Starting on April 1, all TDS calculations are reset. Any balance in your account on March 31 is treated as a withdrawal and taxed then, and the remainder is carried forward into the new financial year with a clean slate².

The year-end sequence works like this. Suppose your net winnings at March 31 are INR 500, so the 30% tax is INR 150. If INR 100 was already deducted during the year, the remaining INR 50 is deducted from your closing balance of INR 1,000, leaving INR 950 carried forward².

If your net winnings are negative at the end of the financial year, no tax is deducted on the balance, and you may be eligible for a refund of tax withheld earlier, which you claim while filing your income tax return². This is the flip side of the net winnings system: because tax was charged on withdrawals that later turned out to be more than covered by deposits, the excess can come back. The refund route is the tax return itself, not the gaming app. For more on recovering withheld tax, see getting back tax withheld on winnings.

China: what counts as a single winning income

China's system hinges on defining one win, because both the exemption and the tax are applied per winning income, not per person per year.

The classification comes first: lottery winnings are incidental income under the Individual Income Tax Law and its implementation regulations, taxed on the full amount of each income, at a 20% proportional rate²². A single winning not exceeding CNY 10,000 is temporarily exempt from individual income tax, a preference that applies to both the welfare lottery and the sports lottery and has been in place since the 1990s²³.

Then the definition of "one win":

The computer lottery rule is the one with teeth. If you hold ten tickets in the same draw of the same game and each wins CNY 1,500, your single winning income is CNY 15,000, which exceeds the CNY 10,000 exemption and is taxed in full at 20%³. Splitting a claim across visits does not help, because the aggregation is by person, draw and game. By contrast, ten winning scratch cards at CNY 1,500 each are ten separate wins, each under the threshold and each exempt.

The exemption is confirmed across provincial tax administrations, from Guangdong to Hunan to Liaoning, all citing the same four-department announcement of 2024²⁰. Jiangsu's guidance restates it plainly: a single winning not exceeding CNY 10,000 is exempt, and anything over is taxed in full under the tax law²⁴.

One further point on shared prizes, from Vietnam rather than China: where one prize has multiple winners, the taxable income is divided among them, but the winners must present legal proof; otherwise the whole income is counted for one individual, and multiple prizes in one game are taxed on the total value¹⁵. The lesson is the same in both country: how the win is documented determines how it is taxed.

For how these rules fit the wider picture of taxing prizes across Asia, start with tax on gambling winnings in Asia.