RSU Taxation for US Expats and Non-Residents: How Vesting While Abroad Creates US and Foreign Tax Obligations

Restricted Stock Units are among the most valuable components of compensation packages at multinational companies, and among the most frequently mishandled from a tax perspective when an employee moves abroad or works across borders. The core principle is simple: RSUs are taxed as ordinary income at the time they vest. But when that vesting event spans multiple countries, the questions of which country taxes which portion, how the Foreign Tax Credit applies, whether the Foreign Earned Income Exclusion covers RSU income, and how to report everything correctly on a US tax return create complexity that catches even financially sophisticated employees unprepared. 

Key Takeaways

• When are RSUs taxed in the US? At vesting. The fair market value of the shares on the vesting date is treated as ordinary compensation income, taxed at regular federal rates regardless of whether the shares are immediately sold or held.
• How are RSUs taxed for US expats? US citizens and permanent residents are taxed on worldwide RSU income at vesting, regardless of where they live. 
• Can RSU income qualify for the Foreign Earned Income Exclusion? No. The IRS consistently holds that RSU vesting income is deferred compensation, not earned income for FEIE purposes, and it cannot be excluded on Form 2555.
• Do tax treaties apply to RSU income? Yes. Most US tax treaties treat RSU income as employment income subject to sourcing rules, which determine which country has primary taxing rights on each portion of the vesting income.
• How is RSU income sourced across borders? Using the grant-to-vest allocation method, which prorates income based on workdays spent in each country between the grant date and the vesting date.

RSUs are deferred equity compensation. A company grants an employee a specified number of units, which convert into actual shares only when vesting conditions are satisfied, typically continued employment over a defined period. There is no tax consequence at the time of grant. The tax event arrives at vesting, when the fair market value of the shares becomes taxable ordinary income.

Getting RSU taxation wrong in a cross-border context produces one of two outcomes: double taxation (paying full tax in two countries with no offset) or under-reporting (failing to report income correctly in one or both countries). Both are avoidable with proper analysis. In this guide, we cover how US Expats can manage RSU taxation. 

What are the Two Taxable Events? Vesting and Sale

Every RSU creates exactly two potential taxable events.

Event 1: Vesting (Ordinary Income)

When RSUs vest, the fair market value (FMV) of the shares on the vesting date is treated as ordinary compensation income. It is added to the employee's W-2 wages and taxed at graduated federal income tax rates up to 37% for 2025 and 2026. The employer typically withholds at the flat supplemental wage rate of 22%, or 37% for aggregate supplemental wages above $1 million in the year. The FMV at vesting becomes the employee's cost basis in the shares for any future sale calculation.

Event 2: Sale (Capital Gains)

Any increase or decrease in share value from the vesting date to the sale date is a capital gain or loss:

• Shares held under 12 months after vesting: Short-term capital gain, taxed at ordinary income rates (10% to 37%)
• Shares held over 12 months after vesting: Long-term capital gain, taxed at preferential rates of 0%, 15%, or 20% depending on taxable income
• Net Investment Income Tax (NIIT): An additional 3.8% applies to capital gains for taxpayers with modified AGI above $200,000 (single) or $250,000 (married filing jointly)

The sale event is generally simpler from a cross-border perspective. The complexity concentrates in the vesting event, where income sourcing and double taxation risk are highest.

How RSU Income Is Sourced Across Borders

When an employee is granted RSUs in one country and vests in another, or works across multiple countries during the vesting period, both the US and most foreign tax authorities use the grant-to-vest allocation method to determine how much of the RSU income belongs to each jurisdiction.

The formula is straightforward:

Each country's share = (Workdays in that country during the grant-to-vest period / Total workdays during the grant-to-vest period) x Total RSU FMV at vesting

For example: An employee is granted 1,000 RSUs on January 1, 2022, under a 4-year quarterly vesting schedule. On January 1, 2026, a tranche vests when FMV is $80 per share, producing $20,000 of RSU income. The employee worked in the US for 3 of the 4 years (days-weighted) and in a foreign country for 1 year.

• US-source RSU income: $20,000 x (3/4) = $15,000
• Foreign-source RSU income: $20,000 x (1/4) = $5,000

The US has primary taxing rights on $15,000. The foreign country has primary taxing rights on $5,000. Both countries may assert taxing rights on the full $20,000 under their domestic law, which is precisely where the Foreign Tax Credit becomes the operative relief mechanism.

How are US Expats Taxed?

US citizens and permanent residents are taxed on worldwide income, regardless of where they live or work. An expat living in Germany, Singapore, the UAE, Australia, or anywhere else remains subject to US federal income tax on RSU income at every vesting event. The US employer may have no presence in the foreign country, the RSUs may vest while the employee is entirely overseas, the foreign country may have already taxed the income in full, and the US tax obligation still exists in its entirety.

This is the defining challenge of RSU taxation for US expats; the starting point is always full US tax on the full FMV at vesting, and the relief comes only through disciplined application of the Foreign Tax Credit.

Why the FEIE Does Not Apply to RSU Income

The Foreign Earned Income Exclusion allows qualifying US expats to exclude up to $130,000 of foreign earned income for 2025 (increasing to $132,900 for 2026) from US federal income tax. To qualify, income must be earned income for services actively performed while the taxpayer's tax home is in a foreign country.

RSU income fails this test. The IRS treats RSU vesting income as deferred compensation rather than current earned income. The vesting event recognizes compensation that relates to a prior service period, not to active services being performed at the moment of vesting. This position is consistent across IRS guidance and established tax practitioner consensus: RSU vesting income does not qualify for the FEIE regardless of where the employee was working when the shares vested. Attempting to exclude RSU income on Form 2555 is an error that will not survive IRS review.

The correct tool for managing double taxation is the Foreign Tax Credit, not the FEIE.

The Foreign Tax Credit: The Right Relief Mechanism

The Foreign Tax Credit under IRC Section 901 allows US taxpayers to offset their US federal tax liability dollar-for-dollar by the amount of income tax paid to a foreign government on the same income.

If a US expat vests $30,000 in RSUs while working in France and pays French income tax of $9,000 on that income, the FTC offsets the US tax on the same $30,000. If the US tax on that income is $7,200 (24% bracket), the FTC eliminates the US liability entirely. The remaining $1,800 in excess foreign tax credit carries forward for up to 10 years or back 1 year.

The FTC Limitation

The FTC cannot exceed the amount of US tax attributable to foreign-source income. Because RSU income is allocated between US-source and foreign-source under the grant-to-vest method, only the foreign-source portion generates a creditable FTC limitation. RSU income classified as US-source cannot generate foreign tax credits even if the foreign country taxes it.

RSU income is classified as general category income for FTC basket purposes, which is favorable because it can be offset by foreign taxes from employment in the same general basket, without dilution by passive income

RSU Reporting on Your US Tax Return

Regardless of where vesting occurred, RSU income must be correctly reported across multiple forms on the US return.

Form W-2: RSU vesting income is included in Box 1 as wages. If you are a US expat whose employer is a foreign entity with no US payroll obligation, the income may not appear on a W-2 and must be self-reported on Form 1040 as wages.

Form 8949 and Schedule D: When vested shares are sold, the transaction is reported on Form 8949 with the FMV at vesting as the cost basis. The resulting gain or loss flows to Schedule D. Brokers frequently report an incorrect zero cost basis on Form 1099-B for RSU shares because no cash was paid at grant. Using a zero cost basis produces double taxation: once as ordinary income at vesting and again as capital gain on the same amount at sale. Always correct the cost basis before filing.

Form 1116: File Form 1116 to claim the Foreign Tax Credit on RSU income taxed abroad. Calculate the general category limitation using the foreign-source RSU income determined by the grant-to-vest allocation. Retain foreign tax assessment documents and payment receipts.

Form 2555: Do not include RSU income on Form 2555. As established above, RSU vesting income is not eligible for the FEIE.

FBAR (FinCEN Form 114) and Form 8938: If vested RSU shares are held in a foreign brokerage account and aggregate foreign account values exceed $10,000, FBAR is required. If the Form 8938 threshold is met ($50,000 for single US residents at year-end), Form 8938 is also required. Unvested RSUs generally do not trigger FBAR, but vested shares held in foreign custodial accounts do.

Common Mistakes in Cross-Border RSU Taxation

• Applying the FEIE to RSU income: RSU vesting income is deferred compensation and is categorically ineligible for exclusion under Form 2555. This is one of the most common errors on expat returns with equity compensation.
• Using a zero cost basis on sale: The cost basis for RSU shares is the FMV at vesting, not zero. Broker-issued 1099-B forms frequently show a zero or partial cost basis. Failing to correct this results in overcounting capital gain and paying tax twice on the same income.
• Ignoring the grant-to-vest allocation: Reporting the entire FMV at vesting as US-source income when part of the vesting period was served abroad overstates US-source income, mischaracterizes the foreign tax credit limitation, and can leave significant FTC unclaimed.
• Missing FTC carryforwards: Unused foreign tax credits carry forward for 10 years. Failing to track and apply carryforward credits means leaving previously paid foreign taxes permanently unrecovered against future RSU vesting events.
• Not reconciling W-2 income with brokerage statements: RSU income on the W-2 may not match the amount appearing on Form 1099-B due to differences in how sell-to-cover withholding transactions are reported. Always reconcile both before filing.

How NSKT Global Can Help

RSU reporting on a US tax return with a cross-border dimension is technically demanding. It requires grant-to-vest allocation analysis, Foreign Tax Credit computation, cost basis reconciliation, FBAR and FATCA review, and in many cases coordination with the foreign country's tax return to ensure credits and deductions are claimed correctly on both sides.

NSKT Global provides comprehensive cross-border tax planning and compliance services for US expats and non-residents with RSU compensation, including:

• Grant-to-vest allocation analysis to correctly apportion RSU income between US-source and foreign-source for all vesting events
• Form 1116 preparation with general category FTC computation and carryforward tracking for RSU income taxed in any foreign jurisdiction
• Cost basis reconciliation between W-2 reported RSU income and broker-reported Form 1099-B to prevent double taxation at sale
• Form 8949 and Schedule D preparation for RSU share dispositions covering short-term and long-term holding period analysis
• FBAR (FinCEN Form 114) and Form 8938 preparation for RSU shares and vested equity held in foreign brokerage or custodial accounts
• Coordination of US Foreign Tax Credit claims with foreign country tax return positions to ensure consistent and defensible treatment on both sides
• Multi-year RSU tax planning for employees with large unvested grant balances approaching a cross-border relocation or repatriation

FAQs

What happens to my RSUs if I move abroad mid-vesting?

Your RSU vesting income will be allocated between your US working period and your foreign working period using the grant-to-vest method. The US-source portion remains taxable in the US. The foreign-source portion is taxable in your new country of residence and may also be subject to US tax (if you are a US citizen or permanent resident), offset by the Foreign Tax Credit. 

Are RSUs taxed differently for non-resident aliens working in the US?

Yes. A non-resident alien who works in the US during part or all of the vesting period has US-source RSU income proportional to the workdays spent in the US under the grant-to-vest method. That US-source income is subject to US federal income tax at graduated rates. Non-residents do not have worldwide income reporting obligations, so only the US-source portion of RSU income appears on their US return.

Do I owe US tax on RSUs that vested before I became a US resident?

If RSUs vested entirely while you were a nonresident alien and entirely outside the US, they are generally not subject to US income tax at vesting. However, once you sell those shares while you are a US resident, the capital gain from the vesting date to the sale date is fully taxable in the US. The cost basis is still the FMV at vesting regardless of your residency status at that time.

How does my employer determine withholding on RSU income when I work across borders?

Most multinational employers use a tax equalization or tax protection policy for internationally mobile employees. Under these policies, the employer coordinates withholding across both the home and host country payrolls, often with the assistance of a mobility tax provider. If your employer does not have such a policy, you are responsible for ensuring your estimated tax payments in both countries are current to avoid underpayment penalties.

What is the difference between the Foreign Tax Credit and the Foreign Earned Income Exclusion for RSU income?

The FEIE excludes qualifying foreign earned income from US taxable income entirely, but RSU income does not qualify as earned income for FEIE purposes. The FTC, by contrast, offsets US tax liability dollar-for-dollar by foreign taxes paid on the same income and applies directly to RSU income without restriction. For employees with RSU compensation, the FTC is the correct and only available mechanism for avoiding double taxation.