Section 83 for Foreign Citizens Working in the US: Treaty Nuances

A French software engineer joins a US startup on an O-1 visa. She receives 400,000 shares of restricted stock at a $0.001 strike, current FMV $0.05, with four-year vesting. US tax counsel advises her to file an 83(b) election to lock in the $19,600 spread as compensation income now and start the capital-gains clock. She files the 83(b).

Eighteen months later, the startup is acquired for $5 per share. Her stock is now worth $2 million. Two years post-vesting she returns to France permanently. France now wants to tax the gain on her shares as French-source employment income under its own equity-compensation rules.

The 83(b) she filed was correct for US tax purposes. The complication is that France’s rules for apportioning equity compensation between work periods can recapture the US-taxed gain as French income, producing a double tax absent careful treaty analysis.

IRC Section 83: the baseline for non-US citizens working in the US

IRC §83 applies to all restricted property received in connection with services, regardless of citizenship. A non-resident alien who becomes a US resident during the vesting period is subject to §83 for vests occurring while a US resident, and potentially for pre-residency vests as well under specific source rules.

Three scenarios commonly arise for foreign citizens:

Foreign citizen working in the US as a tax resident (H-1B, O-1, L-1 with 5+ years, green card holder, etc.). §83 applies the same as for US citizens. Full ordinary income treatment at vest or exercise on the spread.
Foreign citizen on short-term US assignment remaining a non-resident alien (NRA). Only US-source portion is US-taxed. Home country rules apply to worldwide income.
Foreign citizen who leaves the US before full vesting. Vest events after departure may still have US-source components if the vesting period includes US workdays.

The 83(b) election for foreign citizens

An 83(b) election under IRC §83(b) can be filed by any taxpayer receiving property subject to a substantial risk of forfeiture. Foreign citizens working in the US can file.

The election must be filed within 30 days of the property transfer, not the vesting date. Late filings are invalid, with no grace period.

Benefits for a foreign citizen:

Locks in current FMV as the compensation income amount.
Starts the long-term capital gain clock.
Can dramatically reduce total tax on a fast-growth company.

Risks for a foreign citizen:

If the shares are forfeited (departure, termination before vesting), the tax paid is not recoverable.
If the foreign citizen leaves the US before significant appreciation, the 83(b)-taxed amount may not match home-country sourcing for the income.
Home country may not recognize the US 83(b) election. France, for example, taxes equity comp based on its own vesting-period rules.

Home-country treatment: the French example

France taxes RSU and restricted stock income under specific rules in Articles 80 bis and 163 bis G of the French tax code. Equity income is generally taxed at vest (for RSUs) or exercise (for options) as employment income, with preferential rates for “qualified” plans meeting French requirements.

For a plan not qualified under French rules (US plans rarely are), the income is fully taxable as salary at French progressive rates plus social charges.

Apportionment for cross-border workers: France apportions equity-comp income between French and non-French work periods based on the vesting period, similar to the US.

If the French citizen files an 83(b) in the US at grant:

US taxes the spread at grant as US-source compensation (if the engineer is US resident at grant).
France may or may not recognize the 83(b). If France’s rule is to tax at vest, France taxes at vest on French-source portion.
The US-taxed amount can be credited against French tax under the US-France treaty if the treaty’s FTC rules apply.

The potential mismatch: US taxes at grant on the spread (small if grant is near strike), then US taxes capital gain at sale. France taxes at vest on full spread at vest, then French capital gain rules on appreciation after vest. The gain at vest (large for fast-growth startups) is often the contested category.

The US-France treaty and similar provisions

The US-France tax treaty provides FTC mechanics similar to most modern treaties. Article 24 (Relief from Double Taxation) obliges each country to allow credit for tax paid to the other on source-overlapping income.

For 83(b) amounts:

If the US taxes the grant-date spread as compensation and France does not recognize the grant-date event but taxes at vest, the vest-date French tax can be credited against any remaining US tax on the vest-date gain.
But the US gain at vest (if 83(b) was filed) is capital gain, not compensation. France taxes as compensation. Category mismatch can cause FTC baskets not to line up cleanly.

This is where §901’s basket rules (§904(d)) matter. Compensation-sourced income is in one FTC basket; capital-gain-sourced income is in another. A foreign compensation tax cannot fully offset US capital-gain tax on the same economic gain if the baskets are different.

When 83(b) helps and when it hurts foreign citizens

Helps when:

The foreign citizen will remain US-resident through full vesting.
Home country has no equivalent tax at vest, or has a treaty that recognizes US grant-date treatment.
The stock is expected to appreciate significantly and the holder wants LTCG treatment.

Hurts when:

The foreign citizen is likely to return to the home country before vesting completes.
Home country taxes at vest regardless of US election, creating a double-tax exposure at vest.
The stock may be forfeited (high departure risk).
Home country’s capital-gains rules do not recognize US grant-date as basis.

For Indian citizens on H-1B: India taxes RSUs at vest based on vest-date FMV, and does not recognize US 83(b) elections. A late return to India creates complex reconciliation.

For UK citizens on L-1: UK rules on restricted securities can interact with 83(b) in limited ways; careful treaty analysis is needed but generally 83(b) can be preserved if both countries’ timing is coordinated.

Exit tax on green-card abandonment

An expatriation tax applies to long-term green-card holders who abandon residency (8+ of the last 15 years). IRC §877A imposes a mark-to-market tax on all assets, including unvested equity in some cases, at the date of expatriation.

For a foreign citizen who becomes a green-card holder and later returns to the home country:

Exit tax may be owed on unrealized gain at departure.
The home country then taxes its own events (vesting, sale) on subsequent appreciation.
Treaties generally do not provide credit for the exit tax against home-country tax.

This is a significant planning issue. Green-card abandonment without planning can produce substantial tax costs.

Comparison: filing 83(b) as a foreign citizen

Scenario	83(b) decision	Reasoning
Stays in US long-term, stock highly appreciated	File 83(b)	Locks in low grant-date value; LTCG on appreciation
Likely return to home country mid-vesting	Do not file	Home country taxes at vest regardless; 83(b) creates US tax on amount that home country may retax
Stock unlikely to appreciate	Do not file	No benefit; forfeit risk is real
Home country has treaty recognizing US grant treatment	File 83(b) with coordination	Treaty reduces double-tax risk
Green card holder planning return	Consult counsel carefully	Exit tax plus home-country treatment complicates

Frequently asked

If I file 83(b) and then leave the US before vesting, do I get the 83(b) tax back? No. The tax paid on the 83(b) amount is non-refundable if you later forfeit the shares.

Does my home country recognize my US 83(b) election? Depends on the country. France partially; UK sometimes; India no. Consult home-country counsel.

What if I file 83(b) and the company fails? You forfeit the stock and cannot recover the tax paid on the 83(b) amount. Worst-case 83(b) outcome.

Can I claim FTC for home-country tax against US tax on the 83(b) amount? If your home country taxes the grant event, yes, within basket limitations. If your home country taxes only at vest, the timing mismatch complicates FTC.

Does this differ for L-1 vs O-1 vs H-1B visa holders? The visa type does not change §83 treatment. US tax residency and workday sourcing are what matter for §83 and for US-source income determination.

Next step

If you are a non-US citizen considering equity compensation in the US, engage a cross-border tax advisor before accepting grants. The 83(b) decision has a 30-day window from grant date, so any analysis must be complete before that deadline. Model the expected tax outcomes in both countries, including likely return scenarios, before deciding whether to file.