State Taxes When You Move Abroad: Cutting Ties That Count

The problem: states have their own rules

Nothing in federal law makes a state release you when you move abroad. Each state defines residency for itself, most build the definition around domicile — your permanent home in intent, not just in fact — and several will presume you are still theirs until you demonstrate otherwise. A state that still considers you resident can tax your worldwide income, and state law generally offers neither a foreign earned income exclusion nor a credit for UK tax. The federal machinery that protects expats simply does not exist at state level.

The result is a trap with a specific shape: an American in London, fully compliant federally and in the UK, still receiving — or worse, ignoring — resident tax filings expected by the state they left three years ago.

Domicile versus residence

The two ideas do different work. Residence is where you currently live — physical, factual, often defined by day counts. Domicile is the state you regard as your permanent home: the place to which, in the law's traditional phrase, you intend to return. You acquire a domicile of choice by actually settling somewhere new and intending to remain; until both parts are shown, your old domicile persists — however long you have been away.

That persistence is the engine of most expat state problems. A posting abroad, even a long one, framed as temporary — "we'll probably come back to California eventually" — leaves domicile untouched, and with it, in domicile-based states, resident taxation. States decide these questions on the whole picture of your ties: home, family location, driving licence, voter registration, vehicle registrations, bank and professional relationships, where you return for holidays, even club memberships and where your belongings are stored.

The sticky states

Some states have a reputation among practitioners for holding on harder than others — California, Virginia, South Carolina and New Mexico are the ones most commonly cited as difficult to leave. The common thread is an emphasis on domicile and continuing ties over simple presence: a departure that looks temporary, or a file still full of in-state connections, invites the conclusion that nothing really changed.

California deserves its particular billing: it looks at where your closest connections are, and temporary or transitory absences do not end residency (a statutory safe harbour exists for certain long employment-related absences, with conditions). Virginia is explicit that domiciliary residents remain taxable until domicile moves, wherever they live.

None of this makes leaving impossible — it makes leaving an evidenced act rather than an assumed one. And states with no income tax, or those that determine residency mainly by presence, rarely present any of these issues.

What a clean departure looks like

Because domicile is proven by conduct, the practical theme is consistency: make the departure look like what it is — permanent — in every record a state could examine. In concept:

• End or transform the housing tie. A home kept empty and available reads very differently from one sold or let on a long lease.
• Move the administrative ties. Licences, registrations, voter rolls, vehicle and professional registrations tell a story; pointing them all at your new country tells the right one.
• Close the loop on filings. A part-year or final resident return in the year of departure, where the state provides for one, marks the boundary; silently stopping does not.
• Keep the evidence. Tenancy agreements, shipping invoices, school enrolments abroad — the mundane paperwork of a real move is exactly what residency disputes are decided on.

Where this fits in the bigger move

State residency is one leg of a three-legged departure: federal obligations continue wherever you live, UK residence starts under the UK's statutory tests, and the state question sits between them with its own logic. The cases that go wrong are almost always the unexamined ones. If you left a demanding state — or are about to — have the position reviewed once, properly, and put the evidence file together while the facts are fresh.