Canada–US treaty explained: what part of this actually needs a professional?
Some of it, yes — and we will say so on the call if that is the honest answer. The parts that are worth paying for are the ones where a missed election, a missed deadline or an unverified threshold costs more than the fee: the treaty allocates taxing rights by income type, sets reduced withholding rates, resolves dual residence and provides for credit relief.
What if I have already filed and got it wrong?
That is a common starting point. We re-derive the position, identify whether an amendment or a disclosure route is the right vehicle, and tell you which one preserves the relief that is still available. The order matters more than the speed.
How long will it take?
It depends on the documents rather than on us. Once the pack is complete most filings turn around inside a fortnight; anything that needs a certificate from a tax authority runs on that authority's timetable, which we tell you at the start rather than at the end.
I am a US citizen living in Canada, so does the treaty help?
Less than people expect, because of the saving clause. The United States reserves the right to tax its citizens broadly as though much of the treaty did not exist, so a US citizen resident in Canada cannot generally use it to escape US filing or to reduce US tax on most categories of income. Certain provisions are carved out of that clause and do survive it. The practical consequence is that you file in both countries, and the work goes into the credit computation and the order in which the two systems are applied, rather than into claiming an exemption that is not there.
How does the treaty decide which country I am resident in?
Through the tie-breaker in the residence article, and only after each country's domestic rules have already made you resident. The tests look at where you have a permanent home available, then where your personal and economic relations are closer, then habitual abode, then citizenship, with a final step for cases still unresolved. They are applied in sequence and you stop at the first one that gives an answer. Because the first test asks whether a home is available rather than occupied, keeping an empty property in the other country is what most often leaves the question open.
Does my US state have to follow the treaty?
Generally not. The treaty binds the federal governments, and US states are not equally constrained by it. Some follow federal treaty positions, others expressly do not. The same asymmetry runs the other way with provincial rules in Canada. So a position that is settled at federal level can still leave a state filing obligation and a state tax bill, with no treaty relief against it and sometimes no credit available for it on the other side of the border. Deal with the state question separately and early, because it is the part that survives an otherwise tidy federal analysis.
Can the treaty reduce withholding on my US dividends?
The treaty sets reduced rates by income type and dividends are one of the categories it covers, with the rate depending on the character of the holding. The reduction is not automatic. The payer applies the statutory rate unless it holds a valid certification of your status before the payment is made, and getting that certification to the right institution is where most of the work actually lies. Recovering tax over-withheld afterwards means claiming it from the authority on a return, which takes very much longer than handing the payer the paperwork in advance.
Which country taxes the sale of my US rental property?
The country where the property sits has the primary right to tax gains on immovable property, so a US property is dealt with there first. If you are resident in Canada the same gain is reported here as well, computed under Canadian rules in Canadian dollars, with credit for the US tax on that income. The two computations rarely match, because the cost base, the treatment of depreciation taken over the years of ownership and the exchange rates all differ. Expect withholding at the sale stage as well, which is a cash-flow question separate from the final liability.
Do I have to disclose a treaty position on my return?
Where you rely on the treaty to change the result domestic law would otherwise give, both countries expect the position to be disclosed rather than quietly reflected in a number. The disclosure names the article relied on and the facts that bring you within it. There are two reasons to take it seriously. An undisclosed reliance invites the question of why it was not mentioned, and writing it out forces you to identify the article precisely, which is the step most people skip. Keep a copy with the working papers for that year.
How is my RRSP taxed if I move to the United States?
The treaty lets a US resident defer US tax on the income accruing inside an RRSP or RRIF until it is distributed, which is what stops annual growth being taxed with no cash to pay it — but the position has to be taken and, historically, disclosed. On withdrawal Canada takes withholding as the source country and the United States taxes the distribution with a credit, complicated by the fact that the two systems can measure the taxable portion differently. Contributions and basis need tracking from the start. See treaty relief for RRSPs, 401(k)s and IRAs.
Who qualifies for US tax treaty benefits?
A resident of the other treaty country, under that treaty's residence article, who is the beneficial owner of the income and who satisfies any limitation-on-benefits test the treaty contains. Nationality is not the test and neither is where the bank is. Note the trap in the other direction: a US citizen living in the treaty country generally cannot use the treaty to reduce US tax, because the saving clause preserves the US claim over its own citizens. See our treaty work.
