Pharmacist cross-border tax: commuting to a US pharmacy without paying twice

How commuter wages are taxed

Your US employer withholds as if you were American — federal income tax, state tax, Social Security, and Medicare all come off the W-2 — and Canada then taxes the same wages with a credit for what the US kept. The order matters: the 1040-NR and the state return are prepared first, because the T1's foreign tax credit is built from what those returns actually settle, not from the withholding boxes. CRA accepts US federal tax, state tax, and FICA as creditable foreign taxes on employment income, so a properly built credit usually absorbs the whole US bill.

Payroll taxes only run on one side of the river. Under the Canada-US totalization agreement, no CPP is payable on the US wages — you build US Social Security credits instead, and the two systems can combine coverage so a split career still qualifies for benefits in both.

The calendar helps if you use it. US returns are due in April and the T1 on April 30, so we prepare the whole set as one package — the credit numbers on the T1 have to agree with what the 1040-NR and state return actually settled, and a commuter who files the Canadian side first almost always ends up amending it.

Form RC268: making the 401(k) count on both returns

The treaty lets a cross-border commuter deduct US 401(k) contributions in Canada, so the plan reduces both countries' tax instead of just one — the claim goes on Form RC268 with your T1. The conditions track the commute itself: the wages must be taxable in the US, the employer must be a US resident or have a permanent establishment there, and the contributions must relate to that US employment.

The deduction is capped twice — at the tax relief the US allowed, and at your remaining RRSP room. A commuter who also maxes an RRSP can run out of room and lose part of the claim, so we coordinate the 401(k) election percentage and the RRSP contribution as one plan rather than two habits.

Moving home after US licensure years

Pharmacists who built a full US career — PharmD, state licensure, a decade behind an American counter — come home with more paperwork than boxes. The recurring items:

• A final dual-status US return for the year of the move: resident for the working months, non-resident after, and usually the last 1040-series filing you need.
• The 401(k) decision. Leave it invested with a W-8BEN on file and take periodic withdrawals later at the treaty's 15 percent, or move balances earned during non-resident years into an RRSP under paragraph 60(j), which uses no contribution room.
• The HSA problem. Canada gives a Health Savings Account no shelter, so its growth becomes taxable here — most returning pharmacists spend the balance down on qualified medical costs around the move.
• A fresh cost base. Taxable investments reset to fair market value when Canadian residency resumes, so pre-move gains stay out of the Canadian net.

The US brokerage account you kept

The account can usually survive the move, but its paperwork changes the day your address does. An updated W-8BEN puts treaty rates in place — 15 percent on US dividends, credited on your T1 — and the treaty leaves capital gains on portfolio stocks to Canada alone. Be aware that many US brokers restrict or close accounts once a Canadian address appears on file, so ask before the move rather than after.

Reporting follows cost, not value: once the total cost of your foreign property passes CAD 100,000, Form T1135 is due with your return — the brokerage account counts toward it, while the 401(k) and IRA are exempt. Watch for 1042-S slips in March; they carry the withholding detail your foreign tax credit is built from. If you also own the pharmacy at home, the same discipline pairs with the corporate-side planning we run for pharmacy owners.

Source: CRA — Form RC268, Employee Contributions to a United States Retirement Plan for Cross-Border Commuters.