What makes seafarers & mariners different from an ordinary filing?
Ships have their own treaty article, and it usually allocates crew income by reference to the enterprise operating the ship rather than the waters sailed. Days at sea are also treated differently from days in a country for most residency tests. An ordinary preparer applies the general rule and stops there, which is how the relief in the specific provision goes unclaimed.
Can you work with my existing accountant?
That is how most of these engagements run. They keep the domestic file, we take the cross-border piece, and the boundary is agreed in writing so nothing is done twice or missed.
Which country actually taxes my sea pay?
Start with the shipping article rather than the map. It generally allocates crew income by reference to the enterprise operating the ship, so the answer turns on where that enterprise is established, not on the flag the vessel flies and not on the waters it sailed through. Your home country may then tax the same income as a resident, giving relief for what the other country was entitled to charge. So the question is rarely which single country taxes you. It is which one has the primary right, which one taxes you as a resident, and how the second gives credit for the first.
My family stayed home while I sailed, am I still resident there?
In most cases yes, and crew are regularly surprised by it. Residency tests look at where your settled ties are, not simply at how long you were away, and a house and a family left behind are among the strongest ties there are. Time in international waters is generally not presence in any country, so long absences at sea do not build residency somewhere else either. The practical result is that you can owe a resident-basis return at home on worldwide income while owing nothing at all in the country you sailed out of.
Does the flag state get to tax me?
Not usually, and this is the most common misunderstanding in crew files. The flag is a matter of registration. The treaty article that matters allocates crew pay by reference to the enterprise operating the vessel, and operators frequently register ships somewhere they have no establishment at all. A flag state with no operating enterprise and no presence by you generally has no claim on your pay. Where a deduction has nonetheless been taken, the answer is not to accept it as unavoidable but to test the taxing right and, if there is none, to reclaim it where it was taken.
Do I owe tax in the port country where I signed on?
Joining a vessel in a port does not by itself create a liability there. What can create one is an employer or a manning agent established in that country, or a period actually worked ashore there. The distinction matters because payroll systems often deduct on the basis of where the crew member joined rather than on the basis of any taxing right. If the deduction is being taken in a country that has no right to the income, the money is recoverable there, but it is recovered by claim, not by asking the agent to stop.
If two countries both tax me, which one gives the credit?
As a rule the country taxing you as a resident gives relief for the tax the other country was entitled to charge on the same income, not the other way round. Two consequences follow. The first is that the entitlement matters more than the deduction: a credit is given for tax properly charged, so tax deducted without a taxing right is reclaimed at source rather than credited at home. The second is sequence. The primary liability has to be quantified before the credit can be computed, which is why the two returns are prepared together.
Do I owe anything at home if I was at sea all year?
Very possibly. A year spent almost entirely aboard does not remove a home-country filing obligation if you remained resident there, and residency usually survives long absences when the family, the home and the financial ties stay put. What changes is the arithmetic rather than the duty to file. The pay is reported, the treaty allocation is applied, and credit is claimed for tax the other country was entitled to charge. Filing nothing on the basis that you were not in the country is how crew accumulate years that later need a disclosure rather than a return.
Do Canada and the United States share tax information?
Yes, through more than one channel. The treaty has an exchange-of-information article that supports both routine and on-request exchange. Separately, an intergovernmental agreement has Canadian financial institutions identify US-reportable accounts and report them to the CRA, which passes them to the IRS, with the reverse flow for Canadian residents. Most other country pairs use the Common Reporting Standard for the same purpose. See FATCA reporting.
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.
