The first year in a new country is where most expat tax mistakes happen. Not through ignorance of the big rules, but through underestimating how complex the interaction between two tax systems can be — and how quickly an innocent oversight becomes an expensive problem.
Tax residency is the foundation of everything. Where you are tax resident determines which country has the right to tax your worldwide income, which rules govern your investments, and which reporting obligations you carry. It is not simply a matter of where you live — it is a legal status with significant financial consequences, and establishing it correctly in year one sets the terms of your financial life for years to come.
How Tax Residency Actually Works
Tax residency is determined differently in almost every country. Some jurisdictions use a simple day count — spend more than 183 days in the country in a calendar year and you are resident for tax purposes. Others use a combination of factors: where your permanent home is, where your family lives, where your economic ties are strongest.
The United Kingdom uses a Statutory Residence Test that considers not just days spent in the UK but ties — family ties, accommodation ties, work ties and day ties. A British national who has moved to Dubai but still has a home available in the UK may find they remain UK tax resident even if they spend fewer than 90 days there. This surprises many people.
Dual Tax Treaties
Most countries have bilateral tax treaties with each other — agreements that determine which country has the right to tax specific types of income when a person has connections to both. These treaties are designed to prevent double taxation, but they do not eliminate it in every case, and they do not apply automatically. You need to understand the treaty between your home country and your new country of residence, and claim the relief that applies to your situation.
Dividends, interest, pension income and employment income are all typically treated differently under these treaties. The wrong assumption about which country has taxing rights on a pension, for example, can result in being taxed in both jurisdictions — a costly and often avoidable outcome.
The Australian and American Problem
Two nationalities carry particularly complex tax obligations regardless of where they live. Australian citizens moving abroad need to understand when they cease to be Australian tax residents — which is not automatic and requires formal steps — and what happens to their superannuation in the interim.
American citizens are taxed by the United States on their worldwide income regardless of where they live. This applies even to Americans who have not lived in the US for decades. The Foreign Account Tax Compliance Act — FATCA — requires foreign banks to report accounts held by US persons to the IRS. Many foreign banks now decline to open accounts for US citizens for this reason. This is a structural problem that requires planning, not improvisation.
What Records to Keep
In year one, keep a record of every day you spend in each country — entry and exit dates, not just approximate periods. Keep records of where your accommodation was, who paid for it, and who you lived with. Keep records of employment contracts, salary payments and where work was performed.
In the event of a tax authority challenge — which is more common than people expect — contemporaneous records are far more valuable than reconstructed ones. A travel diary maintained at the time is worth more than a spreadsheet assembled afterwards.
The TCG Approach
We do not file tax returns — that is the job of a qualified tax accountant in your jurisdiction. What we do is map the tax landscape so that your financial plan is structured correctly from the beginning. We identify which rules apply to you, which treaties are relevant, and where the risks lie. Our advisers have worked with clients across the UK, Mauritius, Malaysia, the Middle East and beyond. We understand the terrain. Contact us at enquiries@tcg-ltd.com to arrange a complimentary initial conversation.