RSUs and Stock Options Abroad: 2026 Tax Guide for US Expats

Moving abroad with unvested RSUs, stock options, or an ESPP doesn't simplify your equity taxes — it multiplies them. The same award gets split between two tax jurisdictions, possibly triggering AMT on top of foreign payroll withholding, and if you ever renounce US citizenship, unvested RSUs can become a 30% withholding liability. Here's what you need to know before vesting, exercising, or moving.

The Core Problem: Grant-to-Vest Income Sourcing

When an RSU vests — or when a stock option is exercised — after you've worked in more than one country during the award's life, the IRS and your foreign tax authority each want their slice. The question is: how much belongs to which country?

The IRS uses a grant-to-vest workday allocation based on Treasury Regulation §§ 1.861-4 and 1.862-1. The method: count the total workdays between grant date and vest date, then calculate what fraction of those workdays occurred in each country. That fraction determines what portion of the income is US-source vs. foreign-source.¹

The same grant-to-exercise workday fraction applies to stock options. For options, the relevant period is grant date to exercise date (not grant to expiry).²

RSUs and FEIE: Only the Foreign-Source Slice Qualifies

RSU income is earned income — compensation for services rendered — so it is potentially excludable under IRC § 911. But you can only exclude the foreign-source portion.

Using the example above: at vest, $100,000 of your RSU income is German-source. If you qualify for the FEIE (bona fide German resident or 330-day physical presence test), you can potentially exclude up to $132,900 of foreign earned income — so the entire $100,000 German-source RSU income could be excluded, assuming no other foreign earned income pushes you over the limit.

The US-source $100,000 cannot be excluded by the FEIE. It is taxed as ordinary US income regardless of where you live when it vests.

Important nuance: In high-tax countries like Germany (top marginal rate 45%), the Foreign Tax Credit often beats the FEIE for RSU income, because German withholding on the German-source portion can be fully credited against your US tax on that same income. With FEIE, you lose the FTC on excluded amounts — and if Germany withholds more than the US rate, the FEIE can leave money on the table. Run the comparison before your vest date.

Foreign Tax Credit and RSUs: Eliminating Double Taxation

For the foreign-source portion of your RSU income, the Foreign Tax Credit (IRC § 901 / Form 1116) lets you offset US tax dollar-for-dollar with taxes actually paid to the foreign government. This works well in:

• UK (employer PAYE withholding): UK taxes RSU income as employment income at vest under PAYE. That UK tax, properly allocated to the UK-source fraction, is creditable on Form 1116 in the general basket.
• Germany (Lohnsteuer): German Lohnsteuer withheld on the German-source portion is creditable. The high German rates (up to 45%) typically exceed your US marginal rate on that portion — FTC almost always better than FEIE for German-source RSU income.
• Singapore (no income tax): Singapore has no income tax for most employees. No foreign tax to credit → full US tax owed on Singapore-source RSU income. FEIE is the only exclusion tool here.
• UAE (no income tax): Same as Singapore. FEIE is critical for UAE-based expats with RSUs.

One complexity: the §904 FTC limitation basket. RSU income typically falls into the "general basket" alongside your salary. Passive income (dividends, interest) goes in the "passive basket." Don't mix the baskets when calculating your FTC limitation.

Non-Qualified Stock Options (NSOs) Abroad

NSOs follow the same sourcing mechanics as RSUs: the spread at exercise (fair market value minus strike price) is ordinary income, sourced over the grant-to-exercise workday period. The income appears on your W-2 if you're still employed, or on a 1099 if not.

Holding shares after exercise starts a new capital gains period. Your basis is the FMV at exercise (the amount already taxed as ordinary income). A subsequent sale generates long-term capital gain if held more than 1 year, or short-term if held 12 months or less.

2026 LTCG rates: 0% up to $49,450 (single) / $98,900 (MFJ); 15% up to $545,500 (single) / $613,700 (MFJ); 20% above those thresholds. Add 3.8% Net Investment Income Tax (NIIT) above $200,000 (single) / $250,000 (MFJ).³

Incentive Stock Options (ISOs) Abroad: The AMT Trap

ISOs are the most dangerous equity form for expats, because they create AMT exposure that FEIE and FTC cannot fully neutralize.

When you exercise an ISO, you pay no regular income tax on the spread (the bargain element). But the spread — FMV at exercise minus strike price — is a preference item for the Alternative Minimum Tax. It goes on Form 6251 and can trigger AMT even in a year where your regular tax is zero or very low due to FEIE.

2026 AMT exemption: $90,100 (single) / $140,200 (MFJ). The exemption phases out at 50 cents per dollar of AMTI above $500,000 (single) / $1,000,000 (MFJ). This is a tighter phase-out than under prior law — the OBBBA (July 2025) reverted the thresholds and increased the phase-out rate from 25% to 50%, meaning high-income expats face faster AMT exposure than in 2025.⁴

ISO Qualifying vs. Disqualifying Dispositions

If you hold ISO shares for at least 2 years from grant date and 1 year from exercise date, the sale is a qualifying disposition: the entire gain (from strike price to sale price) is taxed as long-term capital gain, not ordinary income. The AMT preference item also converts into an AMT credit you can use against regular tax in future years (Form 8801).

If you sell before those holding periods are met, it's a disqualifying disposition: the spread at exercise becomes ordinary income (like an NSO), and any additional gain from exercise to sale is short-term or long-term capital gain.

For expats considering a disqualifying disposition to avoid a large AMT bill: the ordinary income is still subject to the grant-to-exercise sourcing rules and potentially double-taxed in your foreign country. Coordinate with your tax advisors before deciding.

ESPP (Employee Stock Purchase Plans) Abroad

A qualifying ESPP (§ 423 plan) taxes the discount in two components at sale: (1) the ordinary income component (the §423 discount element, up to 15% of FMV) and (2) the capital gain component (additional appreciation). If shares are sold as a disqualifying disposition, the entire gain at purchase (FMV at purchase minus purchase price) is ordinary income.

For expats, the ordinary income component of an ESPP sale is earned income that can be FEIE-eligible or FTC-eligible using the same sourcing framework as RSUs. The capital gain component is passive and not FEIE-eligible. ESPP plans typically don't create AMT issues unless structured as incentive options, which is uncommon.

Exit Tax and Unvested Equity: IRC §877A

This is where equity compensation becomes most dangerous for expats considering US citizenship renunciation or long-term green card abandonment.

A covered expatriate (net worth ≥ $2M, or 5-year average net income tax ≥ $211,000, or certification failure) who renounces US citizenship triggers the IRC §877A exit tax. For equity:

• Vested shares: marked to market on expatriation date (deemed sold at FMV). You pay LTCG on the gain above the $910,000 exclusion — immediately, even if you haven't sold.
• Unvested RSUs and restricted stock: classified as ineligible deferred compensation under §877A(d). You don't pay exit tax on them immediately. Instead, when they eventually vest and are paid out, the US withholds 30% of the gross amount — no deductions, no treaty relief, no foreign tax credit against that 30%. It is a flat withholding at source.⁵
• Unvested stock options: same ineligible deferred comp treatment if vesting depends on continued service. The 30% withholding applies when the option is exercised (or when the right to exercise is no longer subject to a substantial risk of forfeiture).

The practical implication: if you plan to renounce citizenship and have significant unvested equity, the optimal strategy is to wait until you are fully vested, sell the shares before formally expatriating, and take the resulting capital gain at your regular LTCG rate. An uncoordinated renunciation with a large unvested equity grant can result in a much higher effective tax rate than if you'd planned the sequence carefully.

Country-Specific Considerations

Planning Strategies

Before you move

• Inventory your equity. List all unvested grants, vesting dates, current spread, and estimated value. This determines your US-source exposure at each vest date.
• Model FEIE vs FTC by vest date. Use your grant-to-vest workday fraction to estimate foreign-source income at each vest. Then compare FEIE and FTC outcomes in your destination country. High-tax countries (UK, Germany, France) almost always favor FTC for RSU income.
• ISO AMT planning. If you hold large unexercised ISO grants, exercise them before moving if the spread is modest and you're under the AMT exemption threshold. AMT management is much harder abroad once FEIE reduces your regular tax to near zero.
• Ask your employer about tax equalization. Some employers (especially on company-initiated relocations) provide hypo-tax agreements that make you whole on incremental foreign tax. Not guaranteed — negotiate before your transfer letter is signed.

After you move

• Document workdays meticulously. The grant-to-vest allocation depends on a defensible workday log. If audited, you'll need to prove you were in each country on each workday during the vesting period. Keep travel records and calendar documentation.
• File Form 8938 and FBAR if shares are held in foreign brokerage accounts. Foreign broker accounts holding vested shares are reportable regardless of where the shares originated. Failure-to-file penalties are steep.
• Coordinate your annual exercise strategy with your FEIE/FTC election. Exercising NSOs or ISOs creates significant income in the exercise year. If you're in a FEIE year, the additional income may not be excludable. Consider whether the exercise year's tax outcome is optimized before you act.

When You Need a Specialist

Most US expats with equity compensation need two professionals: a US CPA or EA who is also a Certified Public Accountant experienced in international equity compensation, and ideally a coordinating local tax advisor in the country of residence. The sourcing allocations and FTC/FEIE optimization can't be done correctly without access to both the US return and the foreign employment details.

The situations that most often go wrong without a specialist: ISOs exercised without AMT planning, RSU income taxed in full by a foreign employer with no US credit claimed, unvested equity not considered in expatriation planning until it's too late to restructure.