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Stock Options Cross-Border

Stock options granted while working in Canada but exercised after moving to the US (or vice versa) require careful income allocation between countries. Both countries may claim taxing rights, and the allocation is typically based on the proportion of service days in each country during the vesting period.

Key Points

  • Stock option income is allocated based on the ratio of working days in each country during the vesting period.
  • Canada taxes the employment benefit at exercise; the US taxes at exercise for NQSOs and at sale for ISOs.
  • The treaty generally gives primary taxing rights to the country where services were performed.
  • Employer withholding may not correctly reflect the cross-border allocation.
  • AMT implications in the US may apply for Incentive Stock Options (ISOs).

Action Items

  1. 1.Track your working days in each country during the full vesting period of each option grant.
  2. 2.Calculate the allocation percentage for each country based on the day count.
  3. 3.Ensure your employer reports the correct income allocation on your W-2 and T4.
  4. 4.Claim foreign tax credits for any double-taxed portion of the option income.
  5. 5.Consult a cross-border tax advisor for complex multi-year vesting schedules.

Frequently Asked Questions

How do I allocate if I moved mid-vesting?

Divide total vesting-period working days into days in Canada and days in the US. Each country taxes its proportionate share of the option benefit.

Are RSUs treated the same as stock options for cross-border purposes?

RSUs follow similar allocation rules based on service days. The key difference is RSUs are taxed at vesting (delivery), not at exercise, so the allocation period runs from grant to vest.

Related Scenarios

Critical

TFSA US Tax Trap

The Tax-Free Savings Account is tax-exempt in Canada but receives no treaty protection in the US. The IRS classifies a TFSA as a foreign grantor trust, requiring Forms 3520 and 3520-A annually. Failure to file can result in penalties starting at $10,000 per form per year.

Critical

FBAR Filing Requirements

The Report of Foreign Bank and Financial Accounts (FBAR) must be filed by any US person with foreign financial accounts exceeding $10,000 in aggregate at any point during the year. The FBAR is filed electronically with FinCEN, not the IRS, and has its own deadline and penalty regime.

Core

Substantial Presence Test

The Substantial Presence Test (SPT) uses a weighted formula across three years to determine if a foreign national is a US tax resident. If you meet the test, you are taxed on worldwide income. Understanding the SPT is essential for snowbirds and anyone splitting time between Canada and the US.

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