In this guide
Where are you liable?
The frustrating answer is: potentially multiple places. Most countries tax their residents on worldwide income. Some tax based on where work is performed. And a handful — notably the US — tax their citizens regardless of where they live or work.
For yacht crew, the key question is tax residency. If you have broken residency in your home country (spent fewer than the threshold number of days there in a tax year and genuinely severed your ties), you may owe little or nothing there. But if you haven't properly established non-residency — or if you have strong ties like a family home you return to — your home country will typically still want a slice of your income.
Tax residency and the 183-day rule
Most countries use a 183-day rule as a starting point: spend more than 183 days in a country in a tax year and you're a tax resident there. For crew who are at sea or in various international locations, this can work in your favour — you may not qualify as a tax resident anywhere, or only in a low-tax jurisdiction.
However, residency rules are more nuanced than the simple day count. The UK, for example, uses a Statutory Residence Test with additional "ties" (property, family, employment) that can make you resident even below 183 days. Similarly, claiming non-residency is a formal process — it doesn't happen automatically just because you left the country.
UK crew: the basics
UK nationals working abroad are taxable in the UK if they remain UK tax residents. Breaking residency properly means:
- Spending fewer than 183 days in the UK in a tax year
- Not having a UK home that you use (or having disposed of it)
- Not having a UK job
- Typically: spending fewer than 90 days in the UK if you have other "ties"
If you break residency, foreign income is not subject to UK tax. If you haven't broken it, UK tax applies to worldwide earnings — including your yacht salary paid in a Cayman or Channel Islands structure.
The Seafarers' Earnings Deduction (SED) is an important provision for UK residents who work aboard ships. It can allow a 100% deduction on qualifying foreign income — but the rules around qualifying (vessel type, days outside UK, employment structure) are specific and contested by HMRC. Get specialist advice if you plan to claim it.
US crew: a different problem
US citizens and permanent residents (green card holders) are taxed by the IRS on worldwide income regardless of where they live. This is unusual globally and creates specific challenges for US crew members living and working abroad.
The Foreign Earned Income Exclusion (FEIE) allows US citizens to exclude a significant portion of foreign-earned income from US tax (the threshold is adjusted annually — it was $126,500 in 2024). To qualify, you need to either pass the Bona Fide Residence Test (genuine residency in a foreign country) or the Physical Presence Test (330+ days outside the US in a 12-month period).
US crew who spend most of their time at sea — and therefore not in any single country — sometimes struggle to meet these tests cleanly. This is an area where professional advice from a CPA who specialises in expat or maritime taxation is particularly important.
Flag state and employer structure
Most superyachts are registered under a flag state such as the Cayman Islands, Isle of Man, British Virgin Islands, or Marshall Islands. These flag states typically have no personal income tax. Your employment contract may be structured through a management company in one of these jurisdictions.
This doesn't mean you owe no tax — it means your employer doesn't withhold tax for you. You remain responsible for declaring income in your country of tax residency (if you have one). The flag state's tax treatment of your salary is separate from your personal tax obligations in your home country.
Some crew mistakenly assume that being paid through an offshore structure means their income is tax-free. Tax authorities don't see it that way. The structure of your contract is one factor; your personal tax residency status is another. Both matter.
Records you must keep
If you ever face a tax query, you'll need to prove where you were and when. Keep:
- Passport stamps and entry/exit records — photograph each relevant page; scan your seafarer's discharge book regularly
- Vessel logs — your position each day is recorded; request copies of relevant log pages from the captain
- Crew agreements and payslips — keep every contract and payment record
- Bank records — where was your salary paid from and into?
- Proof of accommodation — wherever you stayed ashore, keep receipts or records
The discipline of keeping clean records costs nothing and protects you significantly. Tax authorities can investigate years after the fact.
Getting specialist help
Yacht crew tax is a niche — most high street accountants don't understand the intersection of seafarer rules, offshore employment structures, and the practicalities of a crew career. Firms that specialise in maritime or crew tax are the right choice. They understand the Seafarers' Earnings Deduction, the FEIE, and how to structure a proper residency break.
A one-off consultation typically costs £200–500. For crew earning $60,000–$180,000 a year, the potential tax saving (or the avoidance of a nasty unexpected bill) makes that easily worth it.