T1 vs 1040 filing dates
The two returns are due in the same season on different dates, with different extension mechanics — and a dual filer has to sequence them so the credit lands where it is usable.
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The two returns are due in the same season on different dates, with different extension mechanics — and a dual filer has to sequence them so the credit lands where it is usable.
Side by side
| Canadian T1 | US 1040 | |
|---|---|---|
| Due | Spring, with a later date for the self-employed | Spring, with an automatic extension available |
| Abroad | No special extension for living abroad | An additional automatic extension applies |
| Extension covers | Filing, not payment | Filing, not payment |
| Instalments | Quarterly where the prior-year test is met | Quarterly for income outside withholding |
| Sequencing | Usually prepared first where Canada taxes first | Prepared second to claim the credit |
Which one applies to you
Work out which country taxes the income first — that return is prepared first, and the second return claims the credit. Filing them in the wrong order is the most common reason a dual filer overpays and reclaims a year later.
How to get this moving
We will tell you if you do not need us. That happens more often than you would expect.
Checked and signed off for the 2025 and 2026 filing seasons by Udit Gupta, Cross-Border Tax Expert, Legal Quotient Consultants. Published as general information. For a position on your own file, call the 24-hour helpline.
International tax accountant — what this page covers
This is the page to read on international tax accountant. It takes T1 vs 1040 filing dates in order — the test that decides who is affected, the returns and forms that follow from it, and a fee quoted in writing before anything starts.
The difference a dedicated cross-border team makes
The fee is fixed before we start
Quoted from your documents and agreed in writing. The number you accept is the number you pay.
4 global offices
Meet us in person in India, the USA, Canada and the UAE, or send everything through the secure portal — the same process either way.
Both sides prepared together
Two returns built against each other by one team, so relief is claimed exactly once and nothing falls between the two systems.
Late and missed years are ordinary work
An unfiled history is not a reason to wait longer. We assess what is still open and what relief the delay attracts before the first return goes in.
What these engagements turn on
Dual filer who had been claiming too little foreign tax credit
A client had filed the US return first each spring because that deadline felt like the pressing one, computing the foreign tax credit on an estimate of Canadian tax that was consistently understated. The credit was therefore short in every year. We established which country taxed each income stream first, recomputed the credits from the assessed Canadian figures, and amended the years still open. The engagement produced corrected returns for those years and a filing calendar that prepares the Canadian return first, so the credit is computed from final figures rather than estimates.
Self-employed filer paying interest on an unpaid balance
A consultant with business income had been using the later self-employment filing date every year and was puzzled by the interest appearing on each assessment. The later date applies to the return, not to the payment, so the balance had been outstanding from the earlier date each year. We built a method for estimating the balance before the payment date from quarterly bookkeeping, separated the payment obligation from the filing obligation in the client's calendar, and reviewed the instalment position. The engagement produced a payment schedule that stops the interest accruing.
Extension abroad relied on for payment as well as filing
A client living outside the United States had taken the additional automatic extension available to filers abroad and assumed the tax date moved with it. It does not. Interest had been accruing on the balance from the original date across more than one year. The work consisted of quantifying what was owed for each year, establishing the correct payment date as distinct from the filing date, and restructuring how the client estimates the balance before the return is finished. The engagement produced settled balances and a routine that separates the two dates.
First year of income outside withholding in both countries
A client left employment to work for themselves on both sides of the border and had never dealt with instalments. The two systems ask different questions: one looks to a prior-year test, the other to income not covered by withholding. We ran both tests for the year, established where instalments were required and where they were not, and set the amounts and dates against the client's cash flow. The engagement produced an instalment schedule for each country and a note of what would change the answer in the following year.
Sequencing set up in the first year after a move
A family moving from Canada to the United States asked which return came first in the year of the move, with part-year income taxed on both sides. We worked through which country had the first claim on each stream of income for that year, fixed the order in which the two returns would be prepared, and set out what each return needed from the other before it could be completed. The engagement produced both returns filed in the right order in the first year, and a written sequence the family has followed since.
Employment taxed in Canada with credit claimed in the second return
A client employed in Canada and filing in both countries had the straightforward version of the problem and still got it wrong, because both returns were prepared at the same time from the same draft figures. Canada taxed the employment income first, so the Canadian return needed to be finished and assessed before the credit on the other return could be computed properly. We rebuilt both returns in the correct order for the year in question. The engagement produced a filed pair of returns consistent with each other.
A Canadian Working in the US on a Work Visa
Immigration status and tax residence are different tests, and a visa says nothing about which country taxes the salary. The file fixes residence, applies the employment article, and sequences the two returns so the credit lands where it is usable.
Read how this one runsLeaving Canada — the Bill You Get for Assets You Still Own
Emigrating triggers a deemed disposition of most holdings, which produces tax on gains never realised in cash. The file values the property, identifies what is excluded, and looks at whether security can be posted rather than the tax paid outright.
Read how this one runsAll case studies — every published engagement in one place.
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