Deferred Compensation Across the Border: NQDC, Section 409A, and Canada's Salary Deferral Rules That Tax It First

Deferred compensation is designed around one country's timing rules. A US nonqualified deferred compensation plan defers income until payment, subject to section 409A's strict election and distribution rules. Canada's salary deferral arrangement rules do the opposite: they include deferred amounts in income in the year the services are performed, whether or not paid, unless the plan fits a narrow exception. An executive who moves between the countries with an NQDC balance, or who earns deferred compensation while resident in one country and receives it in the other, faces two countries taxing the same dollars in different years, with a foreign tax credit that does not always bridge the gap.

Key takeaways

• US NQDC: income is deferred until paid (constructive receipt is avoided by section 409A compliance); FICA is due when vested; a 409A failure triggers immediate inclusion, a 20% additional tax, and interest.
• Canada's SDA rules: an arrangement under which an employee has a right to receive an amount after the year for services in the year is a salary deferral arrangement, and the deferred amount is taxed in the year earned. Exceptions: a three-year bonus deferral plan (paid within three years after the year earned), certain deferred share unit plans, and retirement compensation arrangements (which are taxed 50% on contribution through a refundable tax).
• Treaty sourcing (Article XV): deferred compensation is employment income sourced to where the services were performed; the country where the work was done can tax it when paid even if the recipient has moved.
• Timing mismatch: Canada taxes an SDA when earned; the US taxes NQDC when paid. A Canadian resident in a US NQDC plan is taxed by Canada now and by the US later, with a foreign tax credit only in the year the other country taxes it.
• Moving with a balance: an executive who moves to Canada with a US NQDC balance is taxed by the US when it pays out and by Canada as income when received (Canada does not tax the pre-arrival accrual under the SDA rules if the plan was not an SDA while non-resident), with a Canadian foreign tax credit for the US tax.

The US regime

NQDC plans (elective deferrals, SERPs, phantom stock, long-term incentive plans) allow an executive to defer income until a specified date or event. Section 409A requires that deferral elections be made before the year the services are performed, that distributions occur only on specified events (separation from service, a fixed date, death, disability, change in control, unforeseeable emergency), and that acceleration be prohibited. A plan that fails is taxed immediately on all vested deferrals plus a 20% penalty and interest. FICA applies when the deferred amount vests, not when paid.

The Canadian regime

Canada's salary deferral arrangement rules were written to prevent exactly what NQDC does. If an employee has a right to receive an amount after the year for services performed in the year, and one of the main purposes is deferral, the amount is included in income in the year the services were performed. The exceptions that matter: a bonus deferred no more than three years after the year it was earned; a deferred share unit plan that pays out only on retirement, termination, or death and meets the prescribed conditions; a registered pension plan; and a retirement compensation arrangement, which is taxed at 50% on contribution (refundable when paid out).

A US NQDC plan does not fit any exception. A Canadian resident who participates in one is taxed in Canada on the deferred amount in the year earned.

Cross-border scenarios

Canadian resident, US employer NQDC. Canada taxes the deferral when earned under the SDA rules. The US taxes it when paid (if the services were performed in the US, as US-source income to a non-resident; if performed in Canada, not at all for a non-resident). Canada gives a foreign tax credit only for foreign tax on the same income in the same year, and the US tax arrives years later. The credit is often lost. The cleaner structure is to not defer, or to use a Canadian-compliant plan.

Moving to the US with a Canadian DSU or bonus deferral. The Canadian plan pays out after the move. Under Article XV, Canada can tax the portion attributable to services performed in Canada, through withholding on the payment to a non-resident (Regulation 102 or Part XIII depending on characterization). The US taxes the full payment as income to a resident with a foreign tax credit for the Canadian tax. If the plan was taxed in Canada when earned under the SDA rules, the US taxes it again when paid with no credit available for the earlier Canadian tax.

Moving to Canada with a US NQDC balance. The balance accrued while non-resident of Canada was not an SDA for Canadian purposes. When it pays out, the US taxes it (as US-source income for services performed in the US, subject to 409A's distribution rules) and Canada taxes it as employment income received by a resident. Canada's foreign tax credit for the US tax applies in the same year, so the overlap is relieved, but the US withholding on a non-resident's deferred compensation and the Canadian marginal rate both apply.

Equity-based deferrals. RSUs are generally not SDAs if they vest within three years of grant; deferred share units are SDA-exempt if structured under the prescribed plan rules; phantom stock plans with longer deferrals are SDAs.

Worked example

A Toronto executive of a US company participates in the parent's NQDC plan, deferring $100,000 of a 2026 bonus to 2031.

• Canada. The plan is an SDA; the $100,000 is included in 2026 income at about 53.5%: roughly $53,500 of Canadian tax in 2026.
• US. The executive is a non-resident performing services in Canada; the bonus is not US-source; no US tax in 2026 or 2031.
• 2031. The plan pays $100,000 plus earnings. Canada taxes only the earnings (the principal was taxed in 2026). No US tax.
• Net. No double tax, but the deferral achieved nothing: Canada taxed it in the year earned. Had the executive moved to Florida in 2028, the 2031 payment would be US-taxable to a resident on the full amount, and the 2026 Canadian tax would not be creditable in 2031.

Official sources

"If IRC § 409A requires an amount to be included in gross income, the statute imposes substantial additional taxes which are assessed against the employee/service provider and not the employer/service recipient." — Internal Revenue Service, Nonqualified Deferred Compensation Audit Technique Guide (Publication 5528), https://www.irs.gov/pub/irs-pdf/p5528.pdf

"A salary deferral arrangement is a plan or arrangement made between an employee and an employer where an employee postpones receiving salary and wages to a later year. [...] Treat the deferred salary and wages as employment income in the year the employee earns the amount." — Canada Revenue Agency, Salary deferral arrangements, https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/payroll/payroll-deductions-contributions/special-payments/salary-deferral-arrangements.html

Practitioner note

US deferred compensation plans are built on a timing rule Canada does not have, and a Canadian resident who joins one is taxed by Canada in the year earned regardless. The mismatch is worst for executives who move: the country that taxed the deferral when earned and the country that taxes it when paid are different, and the foreign tax credit works only within a year. We review every NQDC, DSU, and LTIP before the move date, and we often recommend accelerating or restructuring rather than carrying the balance across.

See also: Planning a move? Start with the Canada-to-US tax checklist and browse every corridor by city, province, and state.

Next step

Fairlight prepares the deferred compensation review before a move, the SDA and 409A analysis, and the returns in both countries reporting the deferral and the payout. See cross-border pricing or book a call.