What a dual-status year is
A dual-status year is a single United States tax year during which you are a nonresident alien for part of the year and a resident alien for the rest. It is not a special visa and not an election you choose for fun: it is what the residency rules of IRS Publication 519 (the controlling guide, current 2025 revision confirmed at the official page June 11, 2026) produce mechanically the year your status changes. For the readers of this manual, the classic trigger is the first year of a green card: the year you become a lawful permanent resident after years of snowbirding, the calendar splits into a nonresident stretch and a resident stretch, and each stretch follows different taxation logic.
Why the split matters: two regimes in one year
For the resident part of the year, the United States taxes worldwide income, exactly as it taxes citizens. For the nonresident part, it taxes only defined categories of US-source income. The frontier between those two stretches is the RESIDENCY STARTING DATE, and Publication 519 is where its rules live: under the green card test, residency generally starts the first day you are present in the United States as a lawful permanent resident; under the substantial presence test, it generally starts the first day of presence in the qualifying year; and the publication layers special rules on top (earlier presence, the choices available to people arriving late in the year, the interplay when both tests apply). This page deliberately quotes the architecture and not the fine print: the fine print is precisely what the current Publication 519 is for, and what a cross-border accountant reads against your dates.
The dual-status return: two forms shaking hands
A dual-status year is filed as one return wearing two badges: a Form 1040 for the resident period with a Form 1040-NR attached as a statement for the nonresident period, or the mirror arrangement when the year ends in nonresidency (departure years). Publication 519 dedicates a chapter to the mechanics and the restrictions, and the restrictions are the part that surprises people: a dual-status filer faces limits other filers never meet (around standard deduction availability, joint filing, and certain credits), which is why the FIRST-YEAR conversation with an accountant is not a luxury. The elections the publication describes (including the choice some married arrivals make to be treated as residents for the full year) can dissolve several restrictions at once, at the price of worldwide taxation for the whole year: arithmetic to run both ways, on your numbers, before filing anything.
The Canadian side of the same year
The same months look entirely different to the CRA. A Canadian who takes a green card and actually moves usually ceases Canadian tax residency at some date in the same calendar year, with departure-year consequences this manual covers in the T1 departure guide: deemed disposition of certain assets, the final return, and the paperwork that closes the Canadian file cleanly. The two countries do not coordinate their dates for you: a sloppy year can leave you resident of both for a stretch (the treaty tie-breaker exists for exactly that) or resident of neither on paper while income accrues. The clean configuration is boring and deliberate: pick the move date, document it on both sides, and have the Canadian departure analysis and the US residency starting date analyzed TOGETHER, by people who talk to each other.
The Florida layer: one less government, not one less problem
Florida adds no state income tax to any of this, which is one reason this manual exists. But a first-year LPR in Florida still faces the full federal stack: the dual-status return, the start of worldwide taxation (including Canadian rental income, RRSP and TFSA positions, and the information returns that come with foreign accounts), and the estate-planning consequences of permanent residence. None of those topics belongs to this page; each has its own chapter in this manual, and our substantial presence guide remains the day-count reference for the years BEFORE the green card.
Where this page stops: the neighbour pages
Three neighbouring pages cover ground this one deliberately does not. The substantial presence test page owns the 183-day arithmetic and its 31-day threshold for counting; the day-count calculator runs your three-year weighted math; and the Form 8840 closer connection page covers the snowbird escape hatch from substantial presence. This page begins where those end: the year the question is no longer whether you became a resident, but how to file the year it happened. If you are still counting days and have no green card, start there, not here.
A worked example
A Winnipeg couple receives immigrant visas through a family petition and lands in Fort Lauderdale on May 20 of the tax year, becoming lawful permanent residents that day after fifteen years of five-month winters. Their year splits: January through May 19 nonresident, May 20 through December 31 resident. Their accountant files the dual-status package (1040 with a 1040-NR statement), runs the full-year-resident election arithmetic both ways before choosing, coordinates the Canadian departure return for the same May date with deemed-disposition schedules, and registers every account for the foreign-reporting forms that now apply. The number that surprises them is none: the surprise-free year cost them professional fees they planned for, in two currencies, at the Bank of Canada rate of 1.3930 published June 10, 2026, where each 1,000 USD of cross-border accounting weighs about 1,393 CAD.
Who taxes what: the three levels of a dual-status year
| Level | Resident stretch | Nonresident stretch |
|---|---|---|
| United States federal (IRS) | Worldwide income, Form 1040 side of the dual-status return | US-source categories only, the 1040-NR statement side |
| Canada federal (CRA) | Usually ceased residency from the departure date: departure return, deemed dispositions | Full Canadian taxation while still factually resident |
| Florida | No state income tax either way; the property and estate chapters still apply | |
First-year LPR checklist
- The residency starting date analyzed against Publication 519 (green card test, earlier presence rules).
- The Canadian departure date chosen, documented, and aligned with the US start.
- The dual-status package planned: which form leads, which rides as the statement.
- The full-year-resident election arithmetic run BOTH ways before filing.
- Deemed-disposition schedules and the final Canadian return coordinated with the same accountant conversation.
- Foreign-account information returns inventoried for the resident stretch.
- Next year planned too: the first FULL worldwide year has its own withholding and instalment logic.
Common mistakes
Treating the green-card landing date as a formality instead of the residency hinge it usually is. Filing a plain 1040 for the whole year out of habit (or a plain 1040-NR) when the year was legally split. Ignoring the restrictions specific to dual-status filers and discovering them as IRS letters. Running the full-year election without the worldwide-income arithmetic. Leaving the Canadian departure date undocumented, then arguing about it with two tax authorities. Forgetting that the year AFTER the dual-status year is the first full worldwide year, with its own planning. And doing any of this without a cross-border professional: this page is general information, not tax advice, and Publication 519 in its current revision plus a competent accountant outrank everything written here.
FAQ
Is dual-status the same as dual residency?
No. Dual-status is one country splitting one year into two regimes. Dual residency is two countries claiming you at once, the problem the treaty tie-breaker resolves. A messy move year can feature both, which is the strongest argument for planning the dates.
Can I choose to be a resident for the whole year?
Publication 519 describes elections, notably for married couples, that treat arrivals as residents for the full year and lift several dual-status restrictions, at the price of full-year worldwide taxation. Whether that trade wins depends entirely on your income map: run it both ways with an accountant.
Does my Florida house change any of this?
Owning Florida property never created US tax residency by itself, and it does not change the dual-status mechanics. What it changes is the estate and property paperwork that this manual covers in its possession and succession chapters, which deserve a fresh read the year your status flips.