Stock Options & RSU Tax
in Hong Kong — Done Right

RSUs (Restricted Stock Units) are subject to Hong Kong salaries tax at the point of vesting — that is, the date on which the restrictions lapse and the shares are actually delivered to you. This is distinct from the grant date (when the award is made) and the payment or settlement date (which may be a few days after vest). The taxable amount is the market value of the shares on the vest date, minus any amount you paid to acquire them (usually zero for RSUs).

This is a critical point that is often misunderstood: the payment date and the vest date are not always the same. If there is a three-day settlement lag, you use the vest date — not the settlement date — to determine both the taxable amount and which assessment year the income falls into. Getting this wrong can shift income between tax years and affect your effective rate and provisional tax calculation.

For cliff-vesting RSU tranches (e.g., 25% vesting each year over four years), each tranche is a separate taxable event with its own vest date and its own apportionment calculation.

Stock options (where you pay an exercise price to acquire shares) are taxable at the date of exercise — the date you actually exercise the option and acquire the shares. The taxable gain is the market value of the shares at exercise minus the exercise price you paid. It is not taxable at grant, and it is not taxable at vest of the option (i.e., when the option becomes exercisable).

If you exercise in tranches across multiple years, each tranche has its own exercise date and its own apportionment calculation. The gain on each tranche is assessed in the year of assessment that corresponds to the exercise date.

There is one important exception: if your employment terminates while you hold vested but unexercised options, and IRD deems that the option was effectively "exercised" upon departure for the purpose of IR56G reporting, timing issues can arise. This is a complex area requiring specialist advice.

DIPN 38 (Departmental Interpretation and Practice Note No. 38) is IRD's published guidance on the taxation of share options and awards. The apportionment formula for determining the HK-taxable portion of a gain is: (HK Service Days ÷ Total Grant-to-Vest Days) × Total Gain.

HK Service Days are the days within the grant-to-vest period during which you were rendering employment services in Hong Kong. Days on which you were physically and professionally located outside Hong Kong do not count — including days you were on business travel overseas, working from a home office overseas while on a temporary assignment, or serving in a dual role where part of your duties related to a non-HK employer entity.

Importantly, weekends and public holidays are generally included pro-rata in both numerator and denominator, consistent with how employment days are counted under standard IRD practice. However, extended periods of leave, medical leave, or days between contracts may require specific treatment depending on your circumstances.

The formula applies separately to each grant (or each tranche of a grant with its own vest date). You cannot aggregate across grants for apportionment purposes — each has its own grant date and vest date, and hence its own denominator.

If your employer withheld tax on the full gain but only a portion was HK-sourced, you are entitled to a refund of the excess. The process involves filing an amendment to your salaries tax return (or a formal notice of objection if your assessment has already been finalised) with IRD, supported by evidence of your employment location history during the relevant vesting period.

IRD will review your amendment claim, may request supporting documentation (passport, HR employment records, grant agreements, vest notices), and will issue a revised assessment if they accept your position. Refunds are typically processed within 60 days of the revised assessment being finalised.

You have six years from the end of the relevant year of assessment to file an amendment. This means that in the 2025/26 tax year (ending 31 March 2026), you can amend as far back as the 2019/20 assessment year (ended 31 March 2020). Each year for which you have an overpayment is a separate amendment application.

It is important to note that your employer's withholding of tax on the full gain is not unlawful — they are simply being conservative. The obligation to claim the apportionment and file the amendment rests with you as the individual taxpayer.

This is a classic cross-border vesting scenario. Both Singapore and Hong Kong operate time-based apportionment systems for share awards, but the specific rules differ. Singapore's IRAS uses the period-of-employment basis for stock option income, while HK uses DIPN 38's grant-to-vest day count.

In practice: for the HK salaries tax assessment, you would only include the HK-service-days portion of the gain in your HK taxable income. The Singapore portion would be assessed by IRAS based on Singapore's rules separately. If you are a tax resident in neither jurisdiction during part of the vesting period (e.g., you were in transit or on a separate contract), those days may fall into neither tax net.

The HK-Singapore double tax agreement does not specifically address employment income from equity awards in a way that overrides domestic apportionment rules. However, if there is a genuine risk of double taxation on the same portion of gain, treaty relief may be available in one or both jurisdictions. This is a complex area and specialist advice covering both Singapore and HK tax simultaneously is strongly recommended.

We work with Singapore partner advisers to ensure that the combined HK + SG tax position is optimised and that you are not paying tax in both jurisdictions on the same portion of income.

For listed companies, the market value at exercise date is the stock exchange closing price on that day. For unlisted companies — including pre-IPO startups — there is no market price, and IRD requires a defensible estimated fair market value.

IRD's default approach is to use the most recent funding round price as a proxy. However, this is frequently too high because: (a) funding round prices represent preferred share prices with liquidation preferences not available to option holders; (b) employee share options are subject to lock-up and sale restrictions that significantly reduce their realizable value; and (c) the timing of a funding round may not align with your exercise date.

An independent valuation using recognised methodologies — discounted cash flow analysis, comparable company multiples, recent secondary market transactions, or option pricing models — can establish a lower but defensible value. A professionally prepared valuation report with documented assumptions is far more likely to be accepted by IRD than an unsupported assertion.

If your company has recently completed a 409A valuation (common for US-incorporated startups), this can be a useful starting point, though HK IRD is not bound by US valuation frameworks. We adapt these to the HK standard and can provide the additional commentary that IRD typically requires.

Under the Inland Revenue Ordinance, employers must report employment income — including share award income — on Form IR56B annually. The deadline is 1 May each year, covering income from the assessment year ended 31 March. Share award income should be reported in the year the taxable event occurs (vest for RSUs; exercise for options).

Common errors in IR56B reporting for equity include: (1) reporting the income in the wrong year (e.g., using the payment settlement date rather than the vest date); (2) reporting the full gain without apportionment (creating a mismatch with the employee's apportioned return); (3) using the wrong market value at exercise — particularly for shares with a short blackout window or for non-standard award types; and (4) failing to report equity income at all when the equity is delivered directly by a parent company rather than the HK employer.

If you are an employer who has identified historical IR56B errors, it is generally better to correct these proactively before IRD's annual review cycle. Voluntary correction typically results in no penalty. Errors discovered by IRD can attract assessments against both the employer (for failure to deduct) and the employee, plus potential penalty loadings.

For employees who have left Hong Kong, IR56G (Form for Employees About to Leave Hong Kong) has separate rules regarding equity income that may not yet have crystallised at the departure date. Early specialist advice is critical to avoid creating an unmanageable tax liability for a departing employee.

Yes, in principle. Salaries tax does not arise on the grant of an option or on the vesting of an option — it only arises on exercise. If your options have vested but you choose not to exercise them, no tax liability arises. This is a legitimate tax planning tool: you control when the tax event occurs by controlling when you exercise.

However, there are practical considerations. Most employee share option schemes impose expiry dates — typically 5 to 10 years from grant. Unexercised options that expire worthless obviously create no tax, but also no value. Deferring exercise until near expiry concentrates your tax burden in a single year, which may push you into higher marginal rates or create provisional tax issues.

For ISOs (Incentive Stock Options) issued by US companies to HK-resident employees, the US/HK treatment can diverge significantly. ISOs may qualify for preferential US capital gains treatment if certain holding periods are met, but this has no equivalent in HK — you will pay salaries tax at exercise regardless of whether you immediately sell the shares. Coordinating the optimal exercise and sale strategy from both a US and HK tax perspective simultaneously is a specialist task.

There is no HK equivalent of the UK's HMRC-approved EMI scheme or the US's 83(b) election. HK salaries tax is generally unavoidable at exercise for employment-related options.

Yes. A one-time large RSU vest inflates your income for that year of assessment, causing IRD to issue provisional salaries tax for the following year at approximately 75% of the current year's tax. If you know that the following year's income will be materially lower (because there is no further large vesting event), you can apply for a holdover of the provisional tax.

The holdover application must be filed before the due date of the provisional tax demand notice — typically no later than 28 days before the payment due date. You must provide evidence that your assessable income for the forthcoming year will be lower: grant schedules showing no upcoming vests, a letter from your employer confirming no additional awards, or other documentary evidence.

IRD will review the application and, if satisfied, issue a revised provisional tax demand reflecting your estimated actual income. If your actual income for that year turns out to be higher than estimated, you will be assessed for the balance — so there is an element of forecasting required.

In addition to holdover applications, if you leave Hong Kong employment partway through the year, you may be entitled to a partial-year assessment that reduces your provisional tax proportionately. Again, a timely application is essential.

Hong Kong does not levy any tax on dividends received by individuals. There is no dividend withholding tax in HK, and dividends are not subject to salaries tax or profits tax for individual investors. This applies regardless of whether the shares are HK-listed or overseas-listed.

However, dividends paid by a US company to a HK-resident individual may be subject to US withholding tax at source — typically 30%, reducible to 15% or lower under the US-HK tax agreement for certain categories of investor. If you receive dividends net of US withholding, you cannot reclaim this in HK as there is no HK dividend tax to offset it against. A US tax return filing may be required in some cases.

Capital gains from selling shares after vesting are also not subject to Hong Kong tax — there is no capital gains tax in HK. The taxable event was at vest; subsequent appreciation or depreciation in share value is outside the HK tax net entirely.