Hong Kong Tokenized Securities: US Tax Classification of Blockchain-Based Financial Instruments

The Hong Kong Monetary Authority’s (HKMA) June 2025 issuance of the second tranche of tokenised green bonds, settling on the central bank’s wholesale Central Bank Digital Currency (CBDC) platform, Project Ensemble, has moved tokenised securities from pilot projects to a functioning market infrastructure. This shift, combined with the Securities and Futures Commission’s (SFC) updated guidelines for virtual asset trading platforms effective June 2024, creates a new class of financial instrument for US persons resident in Hong Kong. For a US citizen or Green Card holder living in Hong Kong, the core problem is not the regulatory status of the token under Hong Kong law, but its classification for US federal income tax purposes. A tokenised bond issued under Hong Kong law may be treated as a debt instrument, an equity interest, or a “digital asset” under IRC § 6045(g)(3)(D), with radically different consequences for reporting, characterisation of gain, and exposure to the Net Investment Income Tax (NIIT). The absence of clear IRS guidance on tokenised securities, as distinct from cryptocurrencies like Bitcoin or Ether, forces taxpayers to rely on general principles of tax classification, the substance-over-form doctrine, and the specific facts of each token’s economic design.

The Foundational Classification Problem: Debt, Equity, or Digital Asset

The IRS has not issued a Revenue Ruling or Notice specifically addressing tokenised securities—financial instruments where ownership rights in an underlying traditional asset (a bond, a fund share, or a structured product) are recorded on a distributed ledger. The classification of a tokenised security for US tax purposes therefore begins with an analysis of the rights conferred by the token under Hong Kong contract and securities law, and then applies the general principles of IRC § 385 (debt-equity classification) and the definition of a “digital asset” under IRC § 6045(g)(3)(D), as amended by the Infrastructure Investment and Jobs Act (IIJA) of 2021.

Tokenised Debt: The Debt-for-Tax Purposes Analysis

A tokenised bond that gives the holder a fixed right to principal and interest, with a stated maturity date, and no conversion rights into equity, will likely be classified as a debt instrument for US tax purposes. The analysis follows the factors set out in Treasury Regulation § 1.385-5, which include a fixed maturity date, a fixed rate of interest, and the absence of subordination to general creditors. The Hong Kong SFC’s “Guidelines for the Regulation of Virtual Asset Trading Platforms” (June 2023, updated 2024) require that tokenised securities offered to the public be backed by a legal ownership interest in the underlying asset, typically through a special purpose vehicle (SPV) or a trust structure. If the token represents a direct beneficial interest in a bond held by a Hong Kong trustee, the US holder’s tax treatment mirrors that of a direct investment in the bond: interest is taxable as ordinary income under IRC § 61(a)(4), and any gain on sale is capital gain under IRC § 1221.

The critical nuance arises from the token’s secondary market trading. If the token trades on a Hong Kong-licensed virtual asset trading platform (VATP), the US holder must determine whether the sale triggers a “wash sale” under IRC § 1091. The IRS has not ruled on whether tokenised securities are “stock or securities” for wash sale purposes. The conservative position, supported by the plain language of § 1091 (which applies to “stock or securities”), is that a tokenised bond is a security, and a sale at a loss followed by a repurchase within 30 days is disallowed. The more aggressive position, relying on the IRS’s treatment of cryptocurrencies as property rather than securities under Notice 2014-21, is that the wash sale rules do not apply. Until the IRS clarifies the point, the safe harbour is to treat tokenised securities as “securities” for § 1091 purposes.

Tokenised Equity: The Passive Foreign Investment Company Trap

A tokenised share in a Hong Kong company—or, more commonly, a tokenised interest in a fund or SPV that holds Hong Kong assets—presents a higher risk of being classified as a Passive Foreign Investment Company (PFIC) under IRC § 1291. The PFIC rules apply to any foreign corporation that has 75% or more of its gross income as passive income, or 50% or more of its assets as passive assets. The SPV used to hold the underlying assets for a tokenised security is almost always a foreign corporation for US tax purposes (e.g., a Hong Kong private company limited by shares). If that SPV’s assets are bonds, real estate, or fund shares, the PFIC test is likely met.

A US holder of a tokenised equity interest in a PFIC must file Form 8621 annually, and any distribution or gain is subject to the punitive interest charge regime of IRC § 1291, unless the holder makes a Qualified Electing Fund (QEF) election under § 1295. The QEF election requires the PFIC to provide the US holder with an annual income statement (a “PFIC Annual Statement”), which most Hong Kong tokenised issuers do not produce. The result is that a US person who buys a tokenised real estate fund token in Hong Kong may face a tax rate of 37% plus the NIIT on any gain, with an interest charge calculated from the date of acquisition, rather than the 20% long-term capital gains rate that would apply to a direct investment in the same real estate.

Reporting Obligations: FBAR, FATCA, and the Tokenised Asset

The reporting obligations for tokenised securities are more onerous than for traditional securities, because the token is held through a digital wallet, not a traditional brokerage account. The IRS has not issued specific guidance on how to report tokenised securities on FinCEN Form 114 (FBAR) or IRS Form 8938 (FATCA). The taxpayer must apply the general rules.

FBAR: The Wallet Custodian Test

The FBAR requirement under 31 CFR § 1010.350 applies to a “financial account” held with a “financial institution” outside the United States. A tokenised security held in a self-custodied wallet (i.e., a wallet where the taxpayer holds the private key) is not an account with a financial institution, and therefore arguably not subject to FBAR reporting. However, if the token is held on a Hong Kong-licensed VATP (such as OSL or HashKey), the VATP is a “financial institution” under the Bank Secrecy Act, and the account is a “financial account.” The US holder must file an FBAR for any calendar year in which the aggregate value of all foreign financial accounts exceeds USD 10,000. The penalty for non-willful failure to file is up to USD 12,547 (2024 inflation-adjusted amount per 31 CFR § 1010.820).

The trap for US persons in Hong Kong is that a tokenised bond held on a VATP may also be held through a custodian that is itself a Hong Kong licensed corporation (e.g., a trust company). In that case, the account is with the custodian, not the VATP, and the FBAR filing requirement applies to the custodian account. The taxpayer must aggregate the value of all accounts—traditional bank accounts, brokerage accounts, and VATP accounts—to determine if the USD 10,000 threshold is met.

FATCA Form 8938: The Specified Foreign Financial Asset Test

FATCA Form 8938 requires reporting of “specified foreign financial assets” if the aggregate value exceeds USD 50,000 for a single US person living abroad (USD 200,000 for married filing jointly, per IRC § 6038D). A tokenised security is a “specified foreign financial asset” if it is held for investment and is not held in an account maintained by a US financial institution. The key question is whether the token is a “foreign financial asset” under the definition in Treasury Regulation § 1.6038D-1(a)(1). The regulation includes “any interest in a foreign entity” and “any financial instrument or contract held for investment that is issued by or has as a counterparty a foreign person.”

A tokenised bond issued by a Hong Kong SPV is clearly an interest in a foreign entity (the SPV) and is issued by a foreign person. It must be reported on Form 8938 if the aggregate threshold is met. The value for reporting purposes is the fair market value of the token on the last day of the tax year, or the highest value during the year if the token was sold during the year. The IRS has not specified a methodology for valuing tokenised securities that do not trade on a public exchange. The conservative approach is to use the most recent transaction price on the VATP where the token is listed, or, if no market exists, the net asset value of the underlying assets as reported by the issuer.

The Exit Tax Risk for Long-Term Holders

A US person who has held tokenised securities for a significant period and who is considering relinquishing US citizenship or long-term residency must account for the tokenised assets under the expatriation tax provisions of IRC § 877A. The exit tax applies to any “covered expatriate” who has a net worth of USD 2 million or more on the date of expatriation, or who has an average annual net income tax liability of more than USD 201,000 (2024 figure, inflation-adjusted) for the five years ending before expatriation.

Tokenised securities are treated as “property” for purposes of the deemed sale rule under IRC § 877A(a)(1). The taxpayer is deemed to have sold all of their property at fair market value on the day before expatriation. The gain on tokenised securities is calculated as the difference between the deemed sale price and the taxpayer’s adjusted basis. For a tokenised bond acquired at issuance for HKD 1,000,000 (approximately USD 128,000), the gain is the appreciation, if any, at the date of expatriation. For a tokenised equity interest in a Hong Kong company that has appreciated significantly, the gain could be substantial.

The critical planning point is that the exit tax does not apply to property that is deferred under IRC § 877A(d), such as interests in certain retirement plans. Tokenised securities are not deferred property. The only way to avoid the exit tax on tokenised assets is to sell them before expatriation and recognise the gain in a year when the total gain is below the USD 866,000 (2024 figure) exclusion amount under IRC § 877A(a)(3). The exclusion is a lifetime amount, not an annual amount, so a taxpayer who uses it on a sale of tokenised securities in one year cannot use it again on a subsequent expatriation.

Actionable Takeaways

1. A US person holding tokenised debt instruments on a Hong Kong VATP must file FBAR (FinCEN Form 114) for the VATP account and Form 8938 for the tokenised asset itself, treating the token as a specified foreign financial asset issued by a foreign entity.
2. A tokenised equity interest in a Hong Kong SPV is a PFIC unless the holder can make a QEF election; without a PFIC Annual Statement from the issuer, the holder must use the Mark-to-Market election under IRC § 1296, which requires annual reporting of unrealised gains as ordinary income.
3. The wash sale rules of IRC § 1091 apply to tokenised securities, not to cryptocurrencies; a US person trading tokenised bonds on a VATP must track 30-day wash sale windows to avoid disallowed losses.
4. For long-term holders considering expatriation, tokenised securities are subject to the deemed sale rule of IRC § 877A, and the USD 866,000 exclusion is a one-time, lifetime amount that cannot be reserved for future use.
5. Any US person who has held tokenised securities since 2023 or earlier should review their FBAR and Form 8938 filings for prior years, as the statute of limitations under IRC § 6501(a) is generally three years from the filing date, but non-willful FBAR penalties can be assessed up to six years after the violation.

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.