Do I have to file two tax returns if I hold two passports?
In most dual-citizen situations, yes. Neither citizenship overrides the other, and a treaty between the two countries allocates the tax and stops the same income being taxed twice; it does not remove either filing obligation. So the ordinary position is a return in each country covering the same income, with relief claimed in whichever of them does not have the first claim on a given item. The filing set follows from that allocation, which is why the allocation is worked out first. Preparing two returns independently and reconciling them afterwards is how relief that was available ends up unclaimed.
Does a tax treaty mean I only file where I live?
No, and this is the single most common misunderstanding we see in dual-citizen files. A treaty is about which country may tax which income and about relief from double taxation. It is not a rule about whose forms you complete. You can be resident in one country, have every item of income allocated to that country under the treaty, owe the other country nothing at all, and still be required to file there — and in that situation the return is also the document in which the treaty position is claimed. A position that is never filed is a position that was never taken.
Will my tax-free savings account in one country be taxed in the other?
It can be, and this is the part of dual status people find hardest to accept. A treaty stops double taxation of income; it does not stop one country taxing a product the other country made tax-free. The second country looks at what the account actually holds and how the arrangement is structured, not at the label its statute of origin gives it. The consequence is that income arising inside a shelter can be taxable on the other return, sometimes with reporting of its own attached. Each account is therefore classified from both sides before it is funded, not after.
Which spouse should hold the investments if only one of us is a dual citizen?
It makes a real difference, and it is one of the small choices that cost nothing to make correctly and a great deal to unwind. An account held solely by the spouse who is not a dual citizen may sit outside one of the two systems entirely, while putting the same account in joint names can pull the whole of it in, along with any reporting that attaches. The same logic applies to which of you holds a particular fund, and to who is named on an account opened for a child. These are decisions to take before money moves rather than questions to ask at filing time.
Can I claim credit in both countries for the same tax?
No. Relief runs in one direction per item of income, determined by which country has the first claim on that item under the treaty. Claiming it twice is not a saving, it is an error in both returns. What this means in practice is that the two returns cannot be prepared in parallel by two people who never speak: the country with the first claim is settled item by item, that return is completed so the tax it imposes is a fixed figure, and the other return then claims relief against it with evidence attached.
Do I really have to report the bank accounts in the country I live in?
Yes, from the other country's point of view. Account reporting turns on where the account is, not on where you feel at home, so your everyday current account, your salary account and your local savings are foreign accounts as far as the other system is concerned — and that reporting is normally required whether or not any tax is owed on the income inside them. Dual citizens are often surprised by how much of the annual work is this rather than tax. It is also the part with the least excuse for going wrong, because it needs an account list rather than a computation.
What is a "dual-status alien spouse", and why is my software asking?
The question comes from the filing-status screens, and it is asking whether your spouse was a non-resident or part-year resident for the year — because if they were, a joint return is not available by default. An election exists to treat a non-resident spouse as a resident for the whole year, which unlocks joint filing at the price of bringing their worldwide income into the US return and their accounts into its reporting. See a US person with a non-resident spouse.
Should I claim the foreign tax credit or deduct the foreign tax instead?
The credit is usually worth more, because it reduces tax rather than income, and because unused amounts carry over. The deduction can win in narrow cases — where the limitation would waste most of the credit and you have no prospect of foreign income later to absorb it. The choice is all-or-nothing for the year and it interacts with your carryovers, so it is a decision to model rather than to default. See exclusion against credit.
