Hong Kong Horse Racing and Gambling Winnings: US Tax Reporting for Betting Income from the Jockey Club

For the US citizen or Green Card holder living in Hong Kong, a visit to the Happy Valley or Sha Tin racecourse is a fixture of local life. A winning bet on a local horse, a lucky pick in the Mark Six lottery, or a profitable session at a Macau casino table presents a specific and often misunderstood US tax obligation. While the Hong Kong Jockey Club (HKJC) does not issue a Form W-2G (Certain Gambling Winnings) or a Form 1099-MISC, the Internal Revenue Code (IRC) is unambiguous: all gambling winnings, wherever sourced, are includible in gross income for US tax purposes. For the 2025 tax year, the stakes have been raised by the IRS’s increased focus on foreign income streams and the expanded use of data-sharing agreements under the Foreign Account Tax Compliance Act (FATCA). A US person who fails to report gambling income from Hong Kong or Macau risks not only an underpayment penalty but also a potential fraud investigation, particularly when the winnings are large enough to trigger reporting thresholds on FinCEN Form 114 (FBAR) or Form 8938 (Statement of Specified Foreign Financial Assets). This article examines the precise reporting rules, the limited offset for losses, and the critical distinction between a professional gambler and a casual bettor under US tax law.

The Core Tax Liability: All Winnings Are Gross Income

The foundational principle governing gambling income for US persons is found in IRC § 61(a), which defines gross income as “all income from whatever source derived.” The US Tax Court has consistently held that gambling winnings—including those from horse racing, lotteries, and casino games—fall squarely within this definition. There is no territorial exclusion for winnings earned outside the United States. A Hong Kong resident who is a US citizen or Green Card holder must report the full amount of any gambling win on their US federal income tax return (Form 1040), regardless of whether the win occurred at the HKJC, a Macau casino, or a private mahjong game.

The Source Rule and the Foreign Tax Credit

Under IRC § 861(a)(1), income from gambling is generally sourced to the location where the gambling activity takes place. Winnings from a Hong Kong horse race or a Macau baccarat table are therefore treated as foreign-source income. This classification is relevant for the foreign tax credit (FTC) under IRC § 901. However, Hong Kong and Macau do not impose a withholding tax on gambling winnings. The HKJC pays out winnings net of its own commission (the “takeout”), but no separate tax is levied on the bettor. As a result, the US taxpayer will not have a creditable foreign tax to offset their US liability. The winnings are simply added to the taxpayer’s worldwide income and taxed at their marginal rate.

Reporting Thresholds: When the IRS Expects to See It

Unlike domestic US gambling, where a casino issues a Form W-2G for winnings of USD 1,200 or more from slot machines or USD 5,000 or more from poker tournaments, there is no equivalent third-party reporting from the HKJC. The burden falls entirely on the taxpayer. The IRS does not set a minimum threshold for reporting gambling winnings on Form 1040. Even a single winning bet of HKD 100 (approximately USD 12.80) is theoretically reportable. In practice, the IRS’s enforcement focus is on winnings that are large enough to create a material discrepancy with the taxpayer’s reported income or to trigger FBAR/FATCA filing obligations. A series of winning bets that results in a total annual gambling income exceeding USD 10,000 should be reported as “Other Income” on Schedule 1 (Form 1040), line 8z.

The Loss Offset: A Narrow Window Under IRC § 165(d)

IRC § 165(d) provides a limited relief mechanism: gambling losses are deductible only to the extent of gambling winnings. This is a key distinction from most other personal losses, which are generally non-deductible under IRC § 262. The deduction is claimed as an itemized deduction on Schedule A (Form 1040), and it cannot exceed the amount of winnings reported. For a US person in Hong Kong, this means that a year of net losses at the track cannot be used to offset salary or investment income. Only winning years allow a deduction, and only up to the amount of the win.

Documentation Requirements: The Logbook Standard

The IRS requires contemporaneous documentation to support any gambling loss deduction. In Estate of Todisco v. Commissioner, T.C. Memo 1997-208, the Tax Court held that a taxpayer must maintain a logbook or diary showing the date, type of bet, amount wagered, amount won or lost, and the name of the gambling establishment. For a Hong Kong-based bettor, this means keeping physical or digital records of each HKJC betting slip, each Macau casino session, and each Mark Six ticket. The IRS will not accept a reconstructed summary prepared after the fact. For the 2025 tax year, the IRS’s Large Business and International Division has indicated increased scrutiny of foreign-source gambling deductions, particularly for taxpayers whose Schedule A gambling loss deduction exceeds USD 50,000.

The Professional Gambler Distinction

A narrow exception to the hobby loss rules exists under IRC § 162(a) for taxpayers who can demonstrate that they are engaged in the trade or business of gambling. The Tax Court in Gentile v. Commissioner, T.C. Memo 2020-42, applied a nine-factor test to determine professional status, including the taxpayer’s level of expertise, the time and effort devoted, and the expectation of profit. A US person who gambles full-time in Hong Kong or Macau and maintains a consistent profit history may deduct losses as business expenses (including travel, entry fees, and research materials) without the IRC § 165(d) limitation. The burden of proof is high, and the IRS routinely challenges this classification. A taxpayer claiming professional gambler status should file Schedule C (Form 1040) and be prepared for an audit.

FBAR and FATCA: The Asset Reporting Trap

The most overlooked compliance risk for a US person with significant gambling winnings in Hong Kong is the requirement to report foreign financial accounts. If a winning bet is deposited into a Hong Kong bank account, that account may trigger FBAR (FinCEN Form 114) and FATCA (Form 8938) filing obligations. The thresholds are separate and cumulative.

FBAR Threshold: The Aggregate USD 10,000 Rule

Under 31 C.F.R. § 1010.350, a US person must file an FBAR if the aggregate value of all foreign financial accounts exceeds USD 10,000 at any point during the calendar year. A single large payout from the HKJC—for example, a HKD 1,000,000 (approximately USD 128,000) winning bet on the Hong Kong Derby—deposited into a Hong Kong bank account would immediately trigger this filing requirement. The form is due by April 15, with an automatic extension to October 15. The penalty for non-willful failure to file an FBAR can be up to USD 10,000 per violation. Willful violations carry a penalty of the greater of USD 100,000 or 50% of the account balance.

FATCA Threshold: Form 8938 for Specified Foreign Financial Assets

For FATCA purposes, the reporting threshold for a US citizen living in Hong Kong is higher than the FBAR threshold. Under IRC § 6038D and the corresponding regulations, a US person living abroad must file Form 8938 if the total value of specified foreign financial assets exceeds USD 200,000 on the last day of the tax year or USD 300,000 at any point during the year. Specified foreign financial assets include bank accounts, brokerage accounts, and—critically for the gambler—any interest in a foreign trust or estate. If a large win is held in a Hong Kong bank account, the account value must be aggregated with all other foreign assets (e.g., Hong Kong mutual funds, a Hong Kong apartment) to determine whether the threshold is met. The penalty for failure to file Form 8938 is USD 10,000, with an additional USD 10,000 for each 30-day period of non-filing after a notice from the IRS, up to a maximum of USD 60,000.

The Macau Dimension: Casino Winnings and the No-Rule Rule

Macau, as a Special Administrative Region of China, operates under a different legal and tax regime than Hong Kong. While Hong Kong prohibits casino gambling (the HKJC is a licensed horse racing and lottery operator), Macau’s casinos are legal and constitute the world’s largest gambling market by revenue. For US tax purposes, Macau casino winnings are treated identically to Hong Kong horse racing winnings: they are gross income under IRC § 61(a), and the same reporting and deduction rules apply.

The Lack of a Tax Treaty

Neither the US-Hong Kong Tax Information Exchange Agreement (TIEA) nor the US-China Tax Treaty (which does not extend to Macau) provides any relief for gambling income. The US-China Tax Treaty, when applicable to Mainland China residents, would generally source gambling income to the country of residence under the “Other Income” article (Article 21), but this article does not apply to Macau. For a US citizen or Green Card holder, the worldwide taxation rule overrides any treaty provision. There is no mechanism to exempt Macau casino winnings from US tax.

Form W-2G and the Macau Casino

Macau casinos do not issue Form W-2G. The Macau government does not share individual gambling transaction data with the IRS under FATCA or any other information-sharing agreement. However, the IRS can obtain information through other means, including bank records from Macau-based financial institutions that are subject to FATCA reporting. A US person who deposits large casino winnings into a Hong Kong or Macau bank account creates a paper trail that the IRS can follow. The IRS’s Criminal Investigation division has used bank records to prosecute US persons for tax evasion related to foreign gambling income.

Actionable Takeaways for the US Person in Hong Kong

1. Report all gambling winnings from the HKJC, Macau casinos, and Mark Six on your 2025 Form 1040 as “Other Income” on Schedule 1, line 8z, regardless of the amount.
2. Maintain a contemporaneous logbook of all bets placed, including date, type, amount wagered, and outcome, to support any gambling loss deduction claimed on Schedule A.
3. Monitor your Hong Kong bank account balance daily during the calendar year; if it exceeds USD 10,000 at any point, file an FBAR by April 15, 2026.
4. If your total foreign financial assets exceed USD 200,000 at year-end, file Form 8938 with your 2025 tax return.
5. Do not rely on the absence of a Form W-2G from the HKJC or a Macau casino as a reason to omit winnings—the IRS’s enforcement tools include bank record analysis and FATCA data.

Disclaimer: 本文不構成稅務建議。涉及個人稅務情況請諮詢持牌會計師或稅務師。This does not constitute tax advice. Consult a licensed CPA or tax advisor for your specific situation.