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 taxes my pay if my ship sails international waters?
Generally not the one under the ship at the time. Most treaties give shipping its own article, and it usually allocates crew income by reference to the enterprise operating the ship rather than to the waters sailed, so plotting the voyage answers a question the treaty is not asking. What matters is which enterprise operates the vessel and where that enterprise sits, alongside your own residence. Two crew on the same bridge can therefore reach different answers, because their residence differs, while the ship, the route and the flag are identical for both of them.
Do days at sea count as days in a country for residency?
Not in the way a day ashore does. Residency tests generally count physical presence within a country, and time in international waters is not presence in any country, so days at sea usually fall outside the count rather than into one side of it. That produces the position many mariners find themselves in: comparatively few counted days everywhere, and no country with an obvious claim on a day-count basis. The tests then fall back on their other limbs, such as a permanent home, family and economic ties, which are the parts most people have never evidenced.
Does the ship's flag decide where my seafarer income is taxed?
Rarely, though it is the first thing most crew are told. The flag is the state of registration, and registration and operation are frequently separated on purpose in this industry. Where the shipping article applies, it generally looks to the enterprise operating the vessel, which may be resident somewhere the flag never suggests. Manning agents, technical managers and beneficial owners can each sit in a different country again. Establishing which entity actually operates the ship, as opposed to owning, registering or crewing it, is usually the single piece of work the whole position turns on.
My employer, the flag and my pay currency all differ, who taxes me?
Take them in order and keep them apart, because only some of them carry weight. Your residence is the starting point and is decided by domestic law in each country first, then by the treaty tie-breaker if both claim you. The operating enterprise then matters for the shipping article. The flag usually matters less than it seems and the currency of payment almost never matters at all, though it affects how income is converted and reported. The common error is to reason from the most visible fact, which is the flag on the stern.
Am I still resident at home if I am at sea most of the year?
Often yes, and that surprises crew who have counted their days ashore and found them low. Leaving a country is not the same as becoming non-resident of it. Most systems ask about ties as well as presence, so a home kept available, a family remaining there and bank accounts, vehicles and registrations all continue to point at residence even while you are at sea. Severing residence is a deliberate act with its own evidence and, in some countries, its own departure consequences. Drifting out of a country by being away is not usually recognised.
How do I prove my sea time to a tax authority?
With contemporaneous records rather than a reconstruction. The discharge book, signed articles, crew lists, voyage records and port call logs are the documents authorities accept, because they were created at the time and by someone other than you. Pay records help by corroborating the periods but rarely stand alone. Collect them voyage by voyage while you have access to them. Crew who wait until a query arrives frequently find the operator has changed, the manning agent has gone, and the only surviving record of a year at sea is their own recollection of it.
I work remotely from another country for a company back home — who taxes me?
Usually the country you are physically in, because employment income is generally sourced where the work is done, with your residence country taxing it as well if you are resident there and giving credit. Three things follow: your employer may acquire withholding and social security obligations where you sit, a treaty tie-breaker may be needed if both countries call you resident, and a short trip that becomes a long stay can cross a residence threshold nobody was watching. See remote workers and digital nomads.
Which country do I pay tax to first?
Generally the source country — where the income arises — taxes first, often by withholding before you receive it. Your country of residence then taxes the same income and credits what the source country took. That order is why timing matters: a residence-country return filed before the source-country tax is settled has nothing to credit yet. Getting the sequence right is most of the work. See international tax planning.
