What makes oil & gas rotational workers different from an ordinary filing?
Rotational work is a day-count problem by design: an equal-time rotation puts a worker in a host country for roughly half the year, which is exactly where residency tests and treaty employment articles turn. 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.
Does an equal-time rotation make me resident in the host country?
It puts you exactly where the question becomes hard. Residency tests in most countries turn on presence, and an equal-time rotation is designed to place a worker in the host country for something close to half the year, which is where those tests sit. Some years you will be over the line and some under, on a pattern that is not in your control. Where both countries claim you, the treaty tie-breaker settles it by looking at permanent home, centre of vital interests and habitual abode rather than by counting again. We work out the count first and then, if it is close, the tie-breaker.
Why does my home country give no credit for host country tax?
Usually because the credit was never claimed in the form the home country wanted, or because that country does not accept the other had the right to tax the income. A credit is not automatic on the strength of a payslip deduction. It normally has to be claimed on the home return, supported by evidence of what was assessed rather than what was withheld, and limited to the home-country tax on the same income. Where the host country taxed earnings the treaty did not give it, the answer is a refund claim there rather than a credit at home. Which of the two applies is the first thing to establish.
Do travel days count as days in the host country?
Each country decides that for itself, which is why your travel days are counted by one and not the other. Some treat any part of a day of physical presence as a day; some exclude days in transit; some look at whether you were working. Because rotations put you near the line, a handful of disputed travel days can change the residency answer and the treaty position with it. The practical response is to keep a record that will survive either definition: dates in and out, flight references and the purpose of each movement, so that whichever test is applied the same underlying log answers it.
Can I be treated as resident in two countries at once?
Yes, and rotational workers commonly are. Each country applies its own domestic test, and nothing stops both tests being met in the same year. That is not the end of the matter. Where a treaty applies it contains a tie-breaker that assigns you to one country for treaty purposes, working through permanent home, centre of vital interests, habitual abode and finally nationality. The outcome decides which country taxes your worldwide income and which is limited to income arising there. Dual residence is a starting position to be resolved, not a liability to be paid twice.
Which return should I file first when both countries want one?
Normally the one whose tax the other will be giving relief for. Relief in the residence country is calculated from the liability assessed in the source country, so preparing the residence return first means the figure it relies on is still an estimate. Where filing dates do not allow that order, the second return is filed and then amended once the first is assessed. The sequence matters more than most people expect, because a credit claimed against an estimate frequently comes back queried. We set the order at the start of the engagement and tell you which return is waiting on which.
What records should I keep for my rotation through the year?
A day log, kept as the year runs rather than rebuilt afterwards. Record the date you left, the date you arrived, the country you were in, and whether the day was work, travel or leave, with the flight or crew change reference beside it. Keep your rosters and the itineraries that support them. Payslips alone are not enough, because they show what was deducted rather than where you were. When a residency question turns on a small number of days, the difference between a contemporaneous log and a reconstruction is whether the position can be defended at all.
Do I have to file in both countries?
Frequently yes, and the two filings do different jobs. The country where the income arises taxes it at source; the country where you are resident taxes your worldwide income and then gives credit for the tax already paid. Filing only one side is what leaves relief unclaimed — the credit has to be asked for on a return. We prepare both sides so the numbers agree. See dual filing.
Is double taxation legal?
Yes. Nothing prevents two countries from taxing the same income under their own domestic law — each is exercising its own jurisdiction. What treaties and credit systems do is relieve the outcome rather than prohibit the charge, and relief is generally something you must claim on a return or a form, not something applied automatically. Miss the claim and the double charge stands. Double taxation explains the mechanism.
