A non-domiciled person lives in one country but is legally recognized as having their permanent home in another. The question of what non-domicile means is really a tax question: your domicile, not just where you sleep at night, decides how much of your income a country can tax, how little of your estate is shielded when you die, and which legal system governs who inherits what. In the United States, for example, a non-domiciled individual who dies owning U.S. assets gets an estate tax exemption of only $60,000, compared to roughly $7 million for someone domiciled here.
Domicile Is Not the Same as Residence
Residence is where you live right now. Domicile is the one place you treat as your permanent home, even if you haven’t been there in years. You can rent apartments in three cities and still have a single domicile. Someone working in New York for a decade can remain domiciled in their home country if they genuinely intend to return there permanently.
For U.S. federal estate and gift tax, the IRS treats domicile as the controlling concept rather than physical presence. A person acquires a domicile by living in a place with no definite present intention of leaving. Holding a green card is not conclusive proof that someone intends to be domiciled in the United States.1Internal Revenue Service. Frequently Asked Questions on Estate Taxes
The Three Types of Domicile
Everyone has exactly one domicile at any given time, and it falls into one of three categories.
- Domicile of origin. You acquire this at birth, usually from your parents. It stays with you until you take affirmative steps to replace it, and if you never do, it follows you for life.
- Domicile of choice. You establish this by physically moving to a new place with the genuine intention of staying permanently or indefinitely. Both the move and the intent are required.
- Domicile of dependence. Minors and others who lack legal capacity do not pick their own domicile. A child’s domicile generally follows that of a parent or guardian until the age of majority.
The disputes almost always involve domicile of choice, because intent is invisible and people’s actions do not always line up with what they say.
How Tax Authorities Decide Where You Are Domiciled
No single document settles the question. Courts and tax authorities use a facts-and-circumstances approach, weighing a long list of signals. The ones that tend to carry the most weight:
- How much time you spend in each location. More than 183 days a year in one place is strong evidence, though not conclusive on its own.
- Where your primary home sits. A furnished residence that functions as your main home counts more than a vacation property.
- Where you are registered to vote.
- Where your driver’s license and vehicle registration are held.
- Where you keep your primary bank accounts and other financial ties.
- How your wills, trusts, and powers of attorney describe your residence.
- Where your spouse lives, where your children go to school, and where you belong to religious or community organizations.
For non-U.S. citizens, authorities also look at statements made in visa applications and tax returns, green card status, continuing ties to the former home country, and the location of business interests.1Internal Revenue Service. Frequently Asked Questions on Estate Taxes
Whoever claims a domicile has changed carries the burden of proving it, and the standard is high. In many tax disputes the change has to be shown by clear and convincing evidence, not just a preponderance. Saying you moved is not enough when your license, voter registration, and family remain in the old location.
What Non-Domicile Means for U.S. Income Tax
A non-domiciled nonresident alien is taxed by the United States only on U.S.-source income, not on income earned abroad. The rules split into two categories.
Investment income from U.S. sources, including dividends, interest, rents, and royalties, is subject to a flat 30% withholding tax.2eCFR. 26 CFR 1.871-7 – Taxation of Nonresident Alien Individuals Tax treaties between the United States and many countries can reduce that rate, sometimes to zero for categories like interest. Claiming the reduced rate usually means filing IRS Form W-8BEN with the payer.
Income effectively connected with a U.S. trade or business, such as wages from a U.S. employer or profits from a business operated in the United States, is taxed at the same graduated rates that apply to everyone else. The point is that non-domiciled individuals owe no U.S. tax on income earned entirely outside the country.
What Non-Domicile Means for U.S. Estate and Gift Tax
This is where the status cuts deepest. A U.S.-domiciled person receives a federal estate tax exemption that shelters millions of dollars. In 2026 that exemption reverts to a base of $5 million adjusted for inflation, after the temporary increase enacted in 2017 expires.3Internal Revenue Service. Estate and Gift Tax FAQs A non-domiciled nonresident, in contrast, gets a credit of just $13,000 against estate tax, which shields only the first $60,000 of U.S.-situated assets.4Office of the Law Revision Counsel. 26 USC 2102 – Credits Against Tax Anything above that is taxed at rates reaching 40%.5Office of the Law Revision Counsel. 26 USC 2101 – Tax Imposed
The partial consolation is scope. Only U.S.-situated assets go into a non-domiciled person’s taxable estate, not their worldwide wealth. U.S.-situated assets generally include real property in the United States, tangible personal property physically present here, and shares of stock in U.S. corporations. Assets held abroad fall outside U.S. estate tax. Estate tax treaties with certain countries can narrow which assets count as U.S.-situated or provide a more generous exemption.6Internal Revenue Service. Some Nonresidents With U.S. Assets Must File Estate Tax Returns
Gift tax works differently again. A non-domiciled nonresident who gives away tangible property located in the United States owes gift tax on transfers above the $19,000 annual exclusion per recipient.7Internal Revenue Service. Frequently Asked Questions on Gift Taxes Transfers of intangible property, including stock in U.S. companies, are completely exempt from U.S. gift tax when made by a nonresident non-citizen.8Office of the Law Revision Counsel. 26 USC 2501 – Imposition of Tax That difference matters: gifting U.S. stock during life avoids gift tax entirely, while the same stock sitting in your estate at death would be taxed.
Gifts to a spouse who is not a U.S. citizen use a separate annual exclusion of $194,000 in 2026, rather than the unlimited marital deduction available between two U.S.-citizen spouses.9Internal Revenue Service. Frequently Asked Questions on Gift Taxes for Nonresidents Not Citizens of the United States
What Non-Domicile Means in the United Kingdom and Ireland
The phrase “non-domicile” carries its heaviest everyday weight in the UK and Ireland, where the status directly determines how foreign income is taxed.
United Kingdom
For decades the UK let non-domiciled residents use the remittance basis, paying UK tax on foreign income and gains only when the money was brought into the country. That system is gone. On April 6, 2025, the UK replaced the remittance basis with the four-year Foreign Income and Gains (FIG) regime.10GOV.UK. Reforming the Taxation of Non-UK Domiciled Individuals
Under the new rules, only people who become UK tax residents after at least 10 consecutive years as non-residents qualify. Those who do can claim relief on foreign income and gains for up to four consecutive tax years. The clock starts when UK residency begins, and unused years cannot be carried forward. Claiming the relief costs you your personal tax-free allowances for income tax and capital gains tax.11GOV.UK. Check if You Can Claim the 4-Year Foreign Income and Gains Regime After the four years, worldwide income is taxable in the UK regardless of where you consider your permanent home.
Ireland
Ireland still offers the remittance basis to residents who are not domiciled in the country. An Irish-resident, non-domiciled individual pays tax on Irish-source income but can keep foreign income and gains outside the Irish tax net as long as the money is not brought into Ireland. Unlike the former UK system, Ireland imposes no annual charge for using the remittance basis, and cash accumulated before becoming Irish tax-resident can be brought into Ireland without extra tax.12Revenue Commissioners. Tax and Duty Manual Part 05-01-21A – The Remittance Basis of Assessment
Domicile Also Decides Who Inherits
Tax is only half of what domicile controls. It also determines which country’s laws govern your property when you die. The general rule is that succession of movable property, including bank accounts, investments, and personal belongings, follows the law of the decedent’s domicile at death. Real estate is typically governed by the law of the country where the property sits, regardless of the owner’s domicile.
That split creates real complications. A non-domiciled person living in the United States might find their American brokerage account governed by the inheritance laws of their home country, while their U.S. real estate follows American law. The two systems may have very different rules about spousal shares, forced heirship, and what a will can validly do. Anyone with meaningful assets in more than one country needs estate planning that accounts for both jurisdictions, not just the place they currently live.