Do I file in both Canada and United States?
Usually yes, at least for the transition year. A US citizen in Canada files both returns every year; a Canadian working in the US is taxed there on the work and at home on everything, with a state that may ignore the treaty entirely.
Which return do you prepare first?
Whichever one the credit depends on. Preparing them in the wrong order is the most common reason a credit is claimed in the wrong place, and it is also the most common reason a client ends up paying twice and reclaiming later.
Does the treaty mean I only file once?
No. A treaty allocates the tax; it does not consolidate the filing. Both obligations survive, and in some cases the treaty position itself has to be disclosed on a return before it can be relied on.
What about sub-national tax — states and provinces?
They set their own residency and sourcing rules and are not bound by the federal treaty in the same way. A position that is protected federally can still produce a state or provincial return, which is the single most common surprise in this corridor.
Can you work with my adviser in the other country?
That is how most corridor engagements run. They keep their side, we take ours and the interaction between the two, and the scope boundary is agreed in writing so nothing is duplicated or dropped.
What if I am behind in one country and current in the other?
That is the usual pattern. We map the unfiled years first and check which catch-up routes are open before anything is filed, because the route chosen for one year affects the relief available for the rest.
I am a US citizen living in Canada, must I file?
Yes, and every year. The United States taxes its citizens and permanent residents on worldwide income wherever they live, so the American filing obligation does not switch off when you move. It attaches to status rather than to residence. Canada taxes you because you live here. That means two returns each year covering much of the same income, with relief coming through credits rather than through one country standing aside. The practical work is deciding which return is prepared first, because the credit on one side depends on figures that are only final once the other side has been computed.
Why does my US state still tax me?
Because the treaty is an agreement between two national governments, and a state is not bound by it. States apply their own residency tests and their own rules for deciding where income was earned, and those tests can reach someone the federal position already treats as non-resident. The usual trigger is retained connections: a home kept, a licence, a registration, a family that did not move. So the state position has to be worked separately from the federal one, on the evidence that state actually weighs, and it is not safe to assume a treaty conclusion carries across.
I work in the US on a visa, where do I pay?
In both places, in different measures. The United States taxes the work performed on its soil, and if you remain resident in Canada, Canada taxes you on everything, including that same employment income, and then gives credit for the American tax. The visa itself does not decide the tax outcome; time, ties and where the duties were actually carried out do. There is also a state layer underneath the federal one, with its own sourcing rules. We work out the American liability first, because the Canadian credit claim depends on figures that only exist once it has been computed.
Do I get taxed twice on the same income?
Not if the returns are prepared in the right order and the credits are claimed against the right income. Relief on this corridor is mechanical rather than automatic. Each country taxes what its own rules give it, and the country taxing you as a resident relieves the doubling through a credit limited to its own tax on that income. Double taxation usually appears for one of two reasons: the credit was claimed in the wrong year, or a state charged tax that no federal credit was ever claimed for. Both are fixable, and both are easier to prevent than to unwind.
My green card lapsed, do I still have to file?
Possibly, and it is not safe to assume either way. The American obligation follows citizenship and permanent resident status rather than where you are living, and that status does not always end when a card stops being useful for travel. Until it is formally brought to an end, the worldwide filing obligation can continue to run, and returns left unfiled while it ran do not disappear. The first piece of work is establishing what your status actually is, and from what date, in writing. Only then is it possible to say which years are open and what has to be brought up to date.
How is my first US company taxed if I live abroad?
The company is taxed where it is organised, on what the American rules give that country, and you are taxed where you live on what you take out of it. The questions that decide the file are where the work is actually performed, how you are paid, and whether the company creates a presence beyond the country it was formed in. Founders usually meet this corridor through payroll first, because paying yourself out of an American entity while living elsewhere brings withholding and reporting on both sides. It is easier to settle that before the first payroll run than to restate it afterwards.
Can an accountant in one country file my return in another?
Yes, where they are authorised to represent you with that tax authority and the filing is done electronically. What matters is not where the adviser sits but whether they can lawfully act for you and are competent in both systems — a return prepared with no knowledge of the other country is where the relief gets missed. We file on both sides, from offices in India, the USA, Canada and the UAE. See how we work.
Is moving money between my own accounts in two countries taxable?
Moving your own capital between your own accounts is not itself income, so the transfer is not what creates tax. What can create tax or reporting is the income the money earned before it moved, a foreign-exchange gain on certain holdings, and the reporting obligations the balances themselves trigger — foreign account and asset reports keyed to balances rather than income. Remittances out of some countries also need certification before the bank will send them. See foreign account reporting.
