There is no comprehensive income tax treaty between the United States and Hong Kong. Hong Kong sits outside the roughly 60-country US treaty network, so none of the usual treaty benefits apply: no reduced withholding rates, no residency tie-breakers, no permanent establishment thresholds, and no coordinated rules for pensions or capital gains.1Internal Revenue Service. United States Income Tax Treaties – A to Z Every cross-border tax question between the two jurisdictions is decided by each side’s domestic law.
The US does have a full treaty with the People’s Republic of China, but the IRS treats Hong Kong as a separate tax jurisdiction, consistent with its distinct legal and tax system as a Special Administrative Region.2Internal Revenue Service. Publication 901 – U.S. Tax Treaties Hong Kong has signed comprehensive double taxation agreements with dozens of other countries, and the United States is not among them.3Inland Revenue Department. Comprehensive Double Taxation Agreements Concluded
What the Missing Treaty Actually Costs
The clearest cost shows up in US withholding. When a US payor sends dividends, interest, rents, royalties, or similar fixed and periodic payments to a Hong Kong resident who isn’t engaged in a US trade or business, 30% of the gross payment must be withheld and remitted to the IRS.4Internal Revenue Service. Tax Withholding Types5Internal Revenue Service. Fixed, Determinable, Annual, or Periodical (FDAP) Income A treaty commonly drops that rate to 10% or 15% for dividends and to zero on certain interest. Hong Kong recipients get no such reduction. A Hong Kong holding company receiving $1 million in US-source dividends loses $300,000 at the border; a treaty-country peer receiving the same payment might keep $850,000 or more.
The same pattern runs through the rest of the system. Without a treaty definition of permanent establishment, whether a Hong Kong entity is “engaged in a US trade or business” is decided entirely under US domestic law, and the threshold can be surprisingly low. Once a Hong Kong entity crosses that line, its effectively connected income is taxed on a net basis at regular US corporate rates, with deductions allowed for related expenses. That is generally a better outcome than 30% on gross, but there is no treaty safe harbor keeping modest US activity from getting classified as a US business in the first place.
Real property sales carry their own trap. When a Hong Kong investor sells US real estate, the buyer must withhold 15% of the amount realized under the Foreign Investment in Real Property Tax Act.6Internal Revenue Service. FIRPTA Withholding Some treaties soften FIRPTA. Hong Kong sellers get no relief and must file a US return to reconcile the withholding against the tax actually owed.
Relief for US Persons Earning Income in Hong Kong
US citizens, green card holders, and domestic corporations owe US tax on worldwide income, so Hong Kong wages, business profits, rents, and investment returns all belong on the US return.7Internal Revenue Service. Reporting Foreign Income and Filing a Tax Return When Living Abroad Two domestic mechanisms do most of the work a treaty otherwise would.
The Foreign Tax Credit
The Foreign Tax Credit offsets your US bill dollar-for-dollar by the income tax you actually paid to Hong Kong, capped at the US tax on the same category of foreign-sourced income. It works well against Hong Kong’s Profits Tax and Salaries Tax. It works badly on investment income, because Hong Kong doesn’t tax dividends, interest, or general capital gains. No Hong Kong tax paid means no credit to claim, and the US tax on that income stands.
The Foreign Earned Income Exclusion
US citizens and residents living and working in Hong Kong can exclude up to $132,900 of foreign earned income from US taxation for 2026, provided they meet either the bona fide residence test or the physical presence test.8Internal Revenue Service. Figuring the Foreign Earned Income Exclusion A separate foreign housing exclusion covers qualifying housing costs above a base amount, with a location-specific ceiling the IRS publishes each year in the Form 2555 instructions.9Internal Revenue Service. Foreign Housing Exclusion or Deduction Hong Kong’s housing costs make that piece unusually valuable.
The exclusion only reaches wages and self-employment earnings. Investment income, rental income, and pensions are excluded from the exclusion, so to speak. You can’t apply both the FEIE and the FTC to the same dollar, but you can use the exclusion for salary and the credit for other Hong Kong-taxed income in the same year.
Why the Hong Kong Side Doesn’t Offset the US Side
Hong Kong taxes only income arising in or derived from the territory.10Financial Services and the Treasury Bureau. Prevailing Tax Policy That territorial approach is the mirror image of US worldwide taxation, and the interaction is lopsided. Hong Kong imposes no general capital gains tax and no withholding tax on dividends or interest paid to non-residents. For a US investor, that means the Hong Kong side of the ledger is often blank, which sounds like good news until you remember it also means there is no foreign tax to credit against the US bill on the same income. Investment income flowing through Hong Kong to a US person ends up taxed only by the US, with no offset available.
Hong Kong has also introduced a Foreign-Sourced Income Exemption regime that can pull certain passive income of Hong Kong-based entities into local tax unless economic substance requirements are met. That regime primarily affects multinational holding structures rather than individual expats.
Social Security and Self-Employment Tax
The US and Hong Kong have no social security totalization agreement.11Social Security Administration. U.S. International Social Security Agreements Totalization agreements let workers avoid paying into two national systems on the same earnings; without one, a US citizen self-employed in Hong Kong can owe US Social Security and Medicare tax on top of contributions to Hong Kong’s Mandatory Provident Fund.
This hits self-employed people hardest. The Foreign Earned Income Exclusion reduces income tax, not self-employment tax. A sole proprietor earning $200,000 in Hong Kong can exclude $132,900 from income tax and still owe the full 15.3% self-employment tax on the entire $200,000: 12.4% Social Security up to the wage base plus 2.9% Medicare. Employees of Hong Kong companies typically don’t feel this the same way, because the interaction between the two systems produces smaller dual contributions for wage earners.
Reporting Obligations That Apply Anyway
The absence of a treaty doesn’t reduce US reporting obligations. If anything, it makes them more important, because there is no treaty framework smoothing over disclosure disputes.
FBAR
A US person with a financial interest in or signature authority over foreign financial accounts whose combined value exceeds $10,000 at any point during the year must file FinCEN Form 114, the FBAR.12FinCEN. Report Foreign Bank and Financial Accounts Hong Kong bank accounts, brokerage accounts, and MPF accounts all count. The FBAR goes to the Financial Crimes Enforcement Network, not the IRS, and is due April 15 with an automatic extension to October 15. Willful violations can draw penalties of up to $100,000 or 50% of the account balance per violation.
Form 8938
FATCA’s individual reporting rule requires certain US taxpayers to report specified foreign financial assets on Form 8938. For US taxpayers living in Hong Kong and filing jointly, reporting kicks in when foreign assets exceed $400,000 at year-end or $600,000 at any point during the year. Single filers abroad face thresholds of $200,000 and $300,000. Taxpayers living in the US have lower thresholds still. Form 8938 is attached to the tax return and covers a broader range of assets than the FBAR, including foreign pension interests and stakes in foreign entities.
The Narrow Bilateral Arrangements That Do Exist
Two bilateral pieces are worth flagging, because they’re the only ones.
Shipping and Aircraft
A reciprocal exemption covers income from the international operation of ships and aircraft. On the US side it runs through Internal Revenue Code Section 883, which excludes qualifying shipping and aircraft income of foreign corporations based in eligible jurisdictions.13Office of the Law Revision Counsel. 26 USC 883 – Exclusions From Gross Income It is narrow and only helps international transport operators.
The FATCA Intergovernmental Agreement
In 2014 the US and Hong Kong signed a Model 2 intergovernmental agreement implementing the Foreign Account Tax Compliance Act.14U.S. Department of the Treasury. Agreement for Cooperation to Facilitate the Implementation of FATCA – Hong Kong Hong Kong financial institutions report accounts held by US persons directly to the IRS, backed by government-to-government exchange on request.15HKSAR Government Information Centre. HK and US Sign Agreement to Facilitate Compliance with FATCA This is a transparency mechanism, not tax relief. It gives the IRS visibility into US taxpayers’ Hong Kong holdings, and it is a large reason why unreported Hong Kong accounts increasingly get caught.
Hong Kong has also adopted the Common Reporting Standard for automatic exchange with other jurisdictions. The US doesn’t participate in the CRS, relying on FATCA instead, but the direction of travel on both sides is the same.