Your First Canadian Tax Return After Moving: Part-Year Rules, Prorated Credits, and the Newcomer Mistakes That Cost Refunds

The first Canadian return is the only one where the calendar is cut in two. From January 1 to the day before arrival, you were a non-resident: Canada wants nothing of your world income for that stretch (only Canadian-source income, if any — rare for a genuine newcomer). From the arrival date to December 31, you are a resident reporting world income — the US salary paid after arrival, the interest on the US savings account, the dividends in the old brokerage, all of it, converted to Canadian dollars. The return carries the entry date on page one, and that date drives the mechanics: the basic personal amount and several other credits are prorated by the fraction of the year you were resident; the arrival-day deemed acquisition sets the cost base for everything you brought; and the benefits system (GST/HST credit, Canada Child Benefit) starts from separate applications rather than from the return itself. Most newcomer mistakes are inclusion mistakes in both directions — reporting the January-to-April US salary Canada never asked for, or omitting the US dividends from October that Canada absolutely did.

Key takeaways

• Entry date on the return: the first T1 asks for the date you became resident; every proration and the CRA's processing key off it. It must match the facts (and the story told to the US side).
• Income split: pre-arrival world income — excluded. Post-arrival world income — included, in Canadian dollars (Bank of Canada rates; the annual average for recurring amounts, transaction-date rates for one-off items). Canadian-source income received while still non-resident (signing bonus from the Canadian employer paid early, for instance) has its own withholding rules.
• Prorated credits: the basic personal amount and spouse/dependant amounts are prorated by days of residency — unless 90% or more of your world income for the whole year was from the Canadian-resident period, in which case full credits are allowed. A late-year arrival with big pre-move US income gets a sliver of the credit; a January arrival gets nearly all of it.
• Foreign tax credits from day one: US tax on post-arrival US-source income (dividends, interest, US rental) credits on the T1 via T2209/provincial forms — the first return is already a two-country credit exercise for anyone with US assets.
• Benefits are applications, not defaults: GST/HST credit and CCB for newcomers run through RC151/RC66 with world-income statements for the pre-arrival period (income before arrival counts for benefit income testing even though it is not taxed).
• Deductions that survive the border: moving expenses to Canada are generally not deductible for a newcomer arriving from outside Canada (the move must be between Canadian locations, with narrow exceptions); RRSP room does not exist yet — it is earned from this year's Canadian income for next year.

What to gather before filing

Arrival-date valuations for everything owned (brokerage statement on the date, property appraisal if meaningful — this is the Canadian cost base forever); US pay stubs bracketing the arrival date to split the salary precisely; records of US tax paid on post-arrival US income for the credit claims; and the entry date evidence. A newcomer's first return can be filed online with NETFILE-certified software once you have a SIN (a SIN is required to file electronically); expect the first assessment to take longer than a domestic return.

Worked example

A family lands in Mississauga on August 15. She earned US$95,000 in the US through August 10, then C$52,000 from a Canadian employer for the rest of the year; their US brokerage paid US$3,200 of dividends after August 15; they sold nothing. Her first T1: entry date August 15; employment income C$52,000; foreign investment income — the post-arrival dividends converted to CAD, with a foreign tax credit for the US tax on them; the US$95,000 pre-arrival salary excluded from income. Credits: she was resident 139 of 365 days and her pre-arrival income dwarfs the 90% test, so her basic personal amount is prorated to roughly 38% of the full amount. Benefits: RC66 for the CCB with the family's 2025 and part-2026 world income disclosed — the CCB phase-out counts the US salary even though the T1 didn't tax it. Cost base memo: the brokerage's August 15 statement is saved as the permanent ACB record. Her husband, who arrived the same day with no post-arrival income, files too — establishing his benefit eligibility and starting his Canadian filing history. The refund mistake they avoided: her employer's payroll had deducted tax as if she'd earn C$52,000 over a full year, so the prorated-credit math still produced a small refund rather than the large one a full credit would have suggested.

Official sources

The CRA states that you become a resident "when you establish significant residential ties in Canada," report world income from that date, and are "considered to have sold the property and to have immediately reacquired it at a cost equal to the fair market value (FMV) on the date that you became a resident of Canada." — Canada Revenue Agency, Newcomers to Canada, https://www.canada.ca/en/revenue-agency/services/tax/international-non-residents/individuals-leaving-entering-canada-non-residents/newcomers-canada-immigrants.html

The CRA states that residency for income tax purposes turns on residential ties — the most significant being "a home in Canada," "a spouse or common-law partner in Canada," and "dependants in Canada" — along with secondary ties. — Canada Revenue Agency, Determining your residency status, https://www.canada.ca/en/revenue-agency/services/tax/international-non-residents/information-been-moved/determining-your-residency-status.html

Practitioner note

First returns are where newcomers meet the difference between what Canada taxes and what Canada counts: pre-arrival income escapes the T1 but shows up in the benefit formulas, and the credit proration surprises anyone who arrived in the fall. We prepare the first year's two returns together as one project — the entry date, the arrival valuations, and the income split have to agree line by line across both countries.

See also: every Canada-US moving guide by city, province, and state; and browse every cross-border tax topic guide, organized by situation.

Next step

Fairlight prepares the first-year part-year returns on both sides — entry date, income split, arrival valuations, prorated credits, and the benefit applications. See cross-border pricing or book a call.