It is the most common shape of a modern business: a company incorporated in Delaware for its investors, a founder who grew up in London and still has a flat there, and a plan to spend most of the year in Dubai because the personal tax is zero. Three flags, one person — and three tax authorities who each believe they have a claim. The question "where do I pay tax?" has no single answer, because each country answers a different question.

Three systems, three logics

The United States is the outlier: it taxes its citizens and green-card holders on worldwide income wherever they live. Moving to Dubai does not end a US filing obligation — it never does, until citizenship does. The United Kingdom taxes by residence, decided largely by a day-counting Statutory Residence Test and your ties to the country. The UAE, for individuals, taxes personal income at zero — but that only helps if the country you left agrees you have genuinely left.

You don't choose where you pay tax. You arrange your facts, and the rules choose for you.

The company has its own residence

A founder's residence is only half the story. A Delaware company is a US taxpayer regardless of where its owner sits. But if that owner runs the business day-to-day from a London desk, the company can acquire a UK taxable presence — a permanent establishment — and the UK can tax the profits attributable to that activity. Where decisions are made, where contracts are signed, and where people work all matter. The map of your business is drawn by your behaviour, not your letterhead.

Treaties decide the ties

When two countries both claim you, a tax treaty's tie-breaker rules usually decide which one wins — looking at where your permanent home is, where your personal and economic ties are strongest, and where you habitually live. One critical fact for this triangle: the US and the UAE have no income tax treaty, while the US–UK and UK–UAE treaties do exist. That absence changes the analysis for any American in Dubai, and it is exactly the kind of detail that turns a confident plan into an expensive surprise.

What a founder should actually do

  • Map the facts before the structure. Residency days, where work happens, who owns what — these decide the outcome, so get them on paper first.
  • Mind the company's footprint, not just your own. A permanent establishment can appear without anyone intending it.
  • Don't assume a move ends an obligation. Especially for US persons — the filing follows the passport.
  • Get a residency certificate where it matters. The UAE issues tax residency certificates that prove your position to other countries.

The good news: handled deliberately, the US–UK–UAE triangle is not a trap but an advantage — few firms understand all three at once. Handled casually, it is the most expensive guess a founder can make. If your life touches more than one of these countries, that is precisely the conversation our cross-border desk exists for.