Building a True Cost Comparison Between a Funded US PhD Offer and a Canadian Offer: Exchange Rate, Tax, and Cost of Living

Start with the actual currency, not the number on the offer

Convert both offers to the same currency using a real daily exchange rate, such as the Bank of Canada's published rate, rather than a rate you remember from months earlier. Redo this conversion close to your decision date, since the rate moves and a stipend that looked competitive at one rate can look different a few months later.

Subtract US tax withholding for nonresident aliens

As a Canadian PhD student on F-1 status, the IRS treats you as a nonresident alien for tax purposes during your exempt years under the Substantial Presence Test, five calendar years for F-1 students. Nonresident aliens file Form 1040-NR and get taxed differently from US citizens and permanent residents, generally without the standard deduction available to residents, though a specific tax treaty article can change individual line items. Review the IRS nonresident alien tax guidance for the filing category that matches your status before you estimate take-home pay.

F-1 stipend income is generally exempt from FICA, Social Security and Medicare tax, while you hold nonresident alien status. This differs from a Canadian offer, where CPP and EI deductions apply instead. Factor in state income tax separately too, since it varies by state and some states charge none at all.

Add health insurance as a real cost

Many US graduate programs require you to carry a specific university health plan or an approved private plan, and the premium often comes out as a separate deduction from your stipend rather than a line the offer letter highlights. Ask the graduate program directly for the exact annual premium and whether the department subsidizes any part of it before you build your comparison.

Check your Canadian tax residency status too

Moving for a multi-year US PhD program does not automatically make you a non-resident of Canada for tax purposes. The Canada Revenue Agency looks at your residential ties, a home, a spouse, or dependents left in Canada, to decide whether you still owe Canadian tax on your world income while you study abroad. Review the CRA residency determination guidance before you assume your US stipend is outside Canadian tax reach.

Adjust for the actual city, not a national average

A stipend at a school in a smaller university town stretches further than the same number in a major coastal city. Look up rent for a one-bedroom or shared apartment near the specific campus, not a national average figure, since cost of living differences between US cities run wider than the differences between Canadian cities.

Compare the tuition waiver, not only the stipend

Most funded PhD offers, Canadian and US alike, include a tuition waiver alongside the stipend. Confirm both offers cover full tuition for the entire program, not only the first year, and check whether the waiver depends on maintaining a teaching or research assistantship each term. A lower stipend with a guaranteed multi-year waiver can beat a higher stipend with a waiver that needs annual renewal and carries real risk of lapsing.

Health care costs beyond the premium

A premium is only part of US health insurance cost. Check the plan's deductible, the amount you pay out of pocket before coverage starts, and typical copays for a doctor visit or prescription. A Canadian provincial health plan usually means little or no cost at the point of care for insured services, which is a real difference from a US high-deductible plan, even when the premiums look similar on paper.

What happens to your provincial health coverage while you are away

Leaving Canada for a multi-year US program can affect your provincial health coverage, since most provinces require you to be physically present in the province for a minimum number of days each year to stay eligible. Check your specific provincial health plan's rules on out-of-province study before you leave, since losing coverage back home changes the true cost of a gap in insurance if you return between terms or after the program ends.

Put the comparison together

Build one line per offer: gross stipend, minus US tax withholding, minus the health insurance premium, converted to Canadian dollars at the current rate, minus local rent. Compare what is left over each month, not the original number printed on either offer letter. Redo the full calculation again closer to your move date, since exchange rates, tax rules, and rent all shift between when you accept an offer and when you actually relocate.

Keep a paper trail for both governments

Save your offer letter, stipend statements, and any tax withholding documents from the US side, and keep records of the days you spend in Canada versus the US each year. Both the IRS and the CRA can ask for this information later, and a Canadian PhD student moving between two tax systems benefits from clean records from the first year, rather than reconstructing them at tax time.