Last Updated: April 2026
For the tens of thousands of US citizens on global work assignments — and the non-US employees of US companies who receive RSU grants — vesting events create some of the most complex tax situations in personal finance. The rules are poorly documented, frequently misapplied, and subject to different interpretations by different countries' tax authorities simultaneously. This guide covers the three core issues: (1) why the FEIE does not shelter RSU income and what happens if you mistakenly apply it; (2) how to claim a Foreign Tax Credit when the host country also taxes the vest; and (3) how multi-country apportionment works when you worked in different countries during the vesting period. Country-specific sections cover the UK, Germany, Australia, Singapore, and UAE — the five most common jurisdictions for US expats receiving RSU vests. Use the RSU Tax Calculator for your US federal and state tax estimate.
The table below summarises how RSU vests are treated in five key countries for US expats, and how that interacts with the US tax obligation. All figures are approximate 2026 rates.
| Country | Host-Country Tax on RSU Vest | US FTC Available? | DTA with US? | Net US Tax After FTC (est.) |
|---|---|---|---|---|
| 🇬🇧 UK | Up to 45% income tax + 2% NIC (employee) | Yes — UK income tax is creditable | Yes — US-UK DTA 2001 | Often $0 (UK rate ≥ US rate) |
| 🇩🇪 Germany | Up to 45% income tax + 5.5% solidarity surcharge on income tax | Yes — German Einkommensteuer is creditable | Yes — US-Germany DTA 1989 (amended) | Often $0 (German rate ≥ US rate) |
| 🇦🇺 Australia | Up to 47% income tax (including 2% Medicare Levy) | Yes — Australian income tax is creditable | Yes — US-Australia DTA 1983 | Often $0 (Australian rate ≥ US rate) |
| 🇸🇬 Singapore | Up to 24% income tax | Yes — Singapore income tax is creditable | No DTA with US | Partial US tax remains (SG rate < US rate) |
| 🇦🇪 UAE | 0% — no personal income tax in UAE | No FTC (no foreign tax paid) | No DTA with US | Full US tax owed (22–37% marginal) |
NIC and social security contributions are generally not creditable for US FTC purposes — only income tax is. UK NIC and Australian Medicare Levy have different crediting rules. Consult a specialist for these components.
The UK is the most common destination for US expats receiving RSU vests. UK treatment:
UK employment tax on RSUs: HMRC treats RSU vest income as employment income taxable under the Pay As You Earn (PAYE) system. The employer (or a UK payroll agent) should operate PAYE on the vest-date market value. UK income tax rates 2026: 20% basic rate (£12,570–£50,270), 40% higher rate (£50,270–£125,140), 45% additional rate above £125,140. National Insurance Contributions (NIC): employee NIC at 8% on earnings between the Primary Threshold (~£12,570) and Upper Earnings Limit (~£50,270), then 2% above. NIC also applies to RSU income.
US treatment: The full vest-date FMV is also US ordinary income. However, the UK income tax paid on the same income is creditable via Form 1116. For a US citizen in the UK 45% additional rate band, the UK tax on the RSU vest exceeds the US tax — the FTC eliminates the US liability entirely and generates excess FTC that may be carried forward to future years.
The NIC vs FICA interaction: UK NIC is not creditable for US FTC purposes (it is a social security contribution, not an income tax). Similarly, UK employee NIC and US FICA (Social Security and Medicare) both apply to RSU vest income for US citizens working in the UK — there is potential double social security taxation unless a US-UK Totalization Agreement applies. The US-UK Totalization Agreement covers Social Security only; if you are covered under UK NIC, you are generally exempt from US Social Security (but not Medicare). Verify your specific coverage status with a specialist.
RSU reporting in the UK: UK tax reporting of employee share plans uses Form 42 (Employment Related Securities — Annual Return), submitted by the employer to HMRC. Employees confirm their PAYE via Self Assessment. US citizens must also report on Form 1040 with FTC claim on Form 1116. Source: HMRC Employment-Related Securities Manual (ERSM).
The UAE imposes no personal income tax. For a US citizen living and working in the UAE when RSUs vest, this creates a straightforward but potentially expensive US tax outcome: the full vest-date FMV is US taxable income, the UAE has taken no tax, and there is no foreign tax to credit against the US liability.
Example: US citizen, UAE resident, $150,000 salary (from a US company), $80,000 RSU vest in 2026. The $80,000 vest is fully taxable in the US at the marginal rate (approximately 24–32%). Federal tax on the vest: ~$22,000–$26,000. FICA also applies (SS and Medicare). State income tax: depends on prior US state of domicile — many UAE-based US expats incorrectly believe they have no state tax exposure. States like California and New York aggressively audit former residents who claim they have left, particularly when US-source income continues.
FEIE reminder: even if the UAE salary qualifies for FEIE (it does, if the bona fide residence or physical presence test is met), the RSU vest income does not qualify. The $130,000 FEIE can be applied to the UAE salary, but the RSU vest is a separate, non-excludable income item.
Planning consideration: the UAE has no income tax, but US expats in the UAE still owe US tax on RSU vests at their full US marginal rate. This is often the single largest US tax item for US citizens in the Gulf. Quarterly estimated payments (via IRS EFTPS from abroad) are strongly recommended. Some UAE-based US expats explore renouncing US citizenship for the long term to eliminate this obligation — a significant and irreversible decision requiring specialist tax and legal advice.
The most complex RSU tax situation for internationally mobile employees is when an RSU grant spans a period during which the employee worked in more than one country. Both the US IRS and most treaty partners use a time-based apportionment formula to allocate the income source.
The formula: Days worked in Country X during vesting period ÷ Total days in vesting period × Total vest value = Income sourced to Country X.
Example: US to UK transfer mid-vest period:
Grant: 1,000 RSUs on January 1, 2024 (vesting period: 4 years, 1,460 days).
Employee works in the US January 2024 – December 2024 (365 days) then transfers to the UK January 2025 – December 2027 (1,095 days).
Vest event: all 1,000 shares vest January 1, 2028 at FMV $200/share ($200,000 total).
US-source: (365 ÷ 1,460) × $200,000 = $50,000.
UK-source: (1,095 ÷ 1,460) × $200,000 = $150,000.
Tax consequences: US: taxes $200,000 total (worldwide income). FTC for UK income tax on the UK-source $150,000. UK: HMRC applies PAYE to the UK-source $150,000 only. Net result: US pays US tax on $50,000 only (after FTC eliminates the US liability on the UK-source portion — assuming UK rate ≥ US rate on that portion).
Documentation requirement: Keep records of travel days, work locations, and employment contracts to support the apportionment calculation. If audited by either the IRS or HMRC, you need contemporaneous records — calendars, flight records, hotel receipts, work-location confirmations from HR. Source: IRS Publication 514, HMRC ERSM160000, OECD Model Tax Convention Commentary Article 15.
Use this checklist each time an RSU vest event occurs while you are working or living outside the US:
Before the vest:
✓ Confirm with HR/equity plan administrator whether the employer is operating payroll in your current country — if not, you may need to self-report and pay the foreign tax directly.
✓ Determine how many days you worked in each country during the full vesting period — you need this for apportionment.
✓ Confirm whether your current country has a US DTA and whether RSU employment income is covered under the employment article (typically Article 15 in most US treaties).
At the vest date:
✓ Record the vest-date FMV in USD — this is your US cost basis.
✓ Record the vest-date FMV in local currency — needed for foreign tax reporting.
✓ Note the exchange rate used (IRS requires the official rate for the date of the transaction — use the IRS Yearly Average Currency Exchange Rates table or the rate on the specific date from a central bank source).
For US tax return:
✓ Include full vest-date FMV in Form 1040 ordinary income (even if excluded from foreign country's tax).
✓ Do NOT apply FEIE to RSU income.
✓ Complete Form 1116 for any creditable foreign income tax paid on the vest.
✓ Report foreign financial accounts (FBAR / FinCEN 114) if foreign brokerage account holds RSU shares and aggregate value exceeds $10,000.
✓ Consider Form 8938 (FATCA) if foreign financial assets exceed the reporting threshold ($50,000–$200,000 depending on filing status and residency).
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Transfer Your RSU Proceeds Home with Wise →No. IRS Revenue Ruling 2004-4 specifically determined that restricted stock plan income does not qualify as 'foreign earned income' for FEIE purposes. RSU vest income is treated as US-source compensation regardless of where you worked when the shares vested. Applying FEIE to RSU income is incorrect and will trigger IRS examination. The FEIE can be applied to qualifying foreign salary income but not to RSU vests, stock options, or other equity compensation. If you have previously excluded RSU income via FEIE, consult a qualified expat tax specialist about amended returns.
Potentially both, but the Foreign Tax Credit eliminates most of the double taxation. The UK taxes the vest as employment income under PAYE (up to 45% for additional rate taxpayers). The US also taxes the full vest as worldwide income. However, you can claim a Foreign Tax Credit (Form 1116) on your US return for the UK income tax paid. Since UK income tax rates equal or exceed US rates for most income levels, the FTC typically eliminates the US tax liability entirely. Note: UK National Insurance Contributions are not creditable for US FTC purposes. You should file both a UK Self Assessment and a US Form 1040, likely with Form 1116 and potentially Form 2555 for any qualifying salary income.
Yes — the full vest-date fair market value is US taxable income at your marginal federal rate. The UAE imposes no income tax, so there is no foreign tax to credit. You owe US tax on RSU vests at your regular marginal rate (22%–37%) plus FICA. Even if your UAE salary qualifies for the Foreign Earned Income Exclusion, RSU vest income does not — FEIE applies to salary, not equity compensation. Many US citizens in the Gulf are surprised to find their largest annual US tax bill is entirely attributable to RSU vests. Quarterly estimated payments via EFTPS from abroad are the practical solution.
Divide the vesting period into days spent working in each country. Apply that fraction to the total vest value to determine each country's source allocation. Example: 3-year vest, 1,095 days total. You worked 365 days in the US and 730 days in Germany. On vest: (365 ÷ 1,095) × vest value = US-source (33%); (730 ÷ 1,095) × vest value = German-source (67%). Germany taxes its 67% share. The US taxes 100% but credits the German tax paid on the 67% German-source portion. Keep contemporaneous records of travel and work locations — required if audited by either tax authority.
Yes, if you are a US citizen or Green Card holder. US citizenship-based taxation applies to all worldwide income regardless of the employer's nationality. If a German company grants you RSUs and they vest while you work in Germany, the vest-date FMV is still US taxable income. The German income tax paid may be creditable via Form 1116. The employer's nationality does not affect your US tax obligation — only your citizenship or immigration status does. Non-US persons (neither US citizens nor Green Card holders) who receive RSUs from US companies may have US tax obligations depending on whether the income is US-source — consult a specialist for non-resident alien treatment.
Standard US expat RSU reporting requires: Form 1040 (US individual return) with RSU vest income in wages; Form 1116 (Foreign Tax Credit) for any creditable foreign income tax paid; FinCEN 114 / FBAR if you hold vested shares in a foreign brokerage account with aggregate balance above $10,000 at any point in the year; Form 8938 (FATCA) if foreign financial assets exceed the filing threshold; and potentially Form 2555 (FEIE) for qualifying foreign salary income — but not for RSU vests. If you used sell-to-cover, you also have a stock sale to report (Form 8949 / Schedule D) even if the immediate gain is zero.
Possibly yes, depending on whether California considers you a former resident with California-source income. California aggressively asserts taxing rights over income derived from California employment even after the employee has left. If your RSU grant was from a California-based employer and the vesting period spans your time in California, California may claim the California-source portion under its apportionment rules — even if you are now a UK tax resident. The safe position is to file a CA non-resident return (Form 540NR) for the California-source portion and claim credit for taxes paid in both the UK and California as appropriate. This is a complex area requiring specialist advice.
Greenback Expat Tax Services and TFX (Taxes for Expats) are the two specialists most commonly used by US expats with RSU vesting situations. Both offer flat-fee pricing, IRS-enrolled agents, and specific experience with equity compensation, Form 1116, and multi-country apportionment. See the specialist section below for links.