Exit Tax and Leaving a Country: Your Complete Cross-Border Planning Guide

What Is Exit Tax and Why It Matters When You Leave

Exit tax—sometimes called departure tax or emigration tax—is a one-time tax liability that arises when you permanently leave a country. Unlike regular annual income tax, exit tax targets the unrealised gains on your assets at the moment you change tax residency. If you own investment property, a business stake, or a substantial investment portfolio and you're planning to move, exit tax could represent a significant, unexpected bill.

The mechanics differ sharply by jurisdiction. The United States applies exit tax only to high-net-worth individuals and certain long-term residents. The UK has historically taxed gains on departure for non-UK-domiciled persons under specific conditions. The UAE, by contrast, has no personal income tax and therefore no exit tax. Understanding which rules apply to you requires clarity on your current residency, destination country, and asset base—which is precisely why early planning is essential.

How Exit Tax Works in the United States

The US charge is the mark-to-market regime of IRC section 877A. It reaches US citizens who have renounced their citizenship and long-term residents who have ended their US resident status for federal tax purposes - and within those two groups, only those who are covered expatriates.

Who is subject:

US citizens who renounce citizenship
Long-term residents who end that status - green card holders who held lawful permanent resident status in at least 8 of the last 15 tax years ending with the year the status ends. Below that count the expatriation rules do not apply at all
Within those groups, a person is a covered expatriate if any one of three tests is met - any one is enough:
The net worth test. In the IRS’s words, "Your net worth is $2 million or more on the date of your expatriation or termination of residency." This figure is not indexed: $2 million has been the threshold since the 2004 amendments, so there is no current-year amount to look up for this test.
The income test. "Your average annual net income tax for the 5 years ending before the date of expatriation or termination of residency is more than a specified amount that is adjusted for inflation." It is an average over those years, not any single year’s liability, and the amount is indexed to the year of expatriation: more than $206,000 for a 2025 expatriation, more than $211,000 for a 2026 one. Amounts for 2027 had not been published when this was written.
The certification test. "You fail to certify on Form 8854 that you have complied with all U.S. federal tax obligations for the 5 years preceding the date of your expatriation or termination of residency." This one turns on filing history rather than money, and the IRS is explicit that where the five years are not satisfied the individual "will be subject to the IRC 877 and 877A expatriation tax provisions even if the individual does not meet the monetary thresholds".

How it is calculated:

A covered expatriate’s property is treated as sold at fair market value "on the day before the expatriation date" - not on the last day of residency, and the distinction matters because it places the deemed gain inside the period when the person was still a US person. Gain is measured against original cost basis and reduced by an exclusion amount, which is indexed and is set by the year of expatriation: $890,000 for 2025 and $910,000 for 2026 (the statutory base is $600,000, adjusted for inflation since 2008). Only gain above that exclusion is taken into account, and where the total gain exceeds it the exclusion has to be allocated pro rata across the gain properties rather than applied to a single asset.

Four classes of asset sit outside the deemed sale and have their own treatment: eligible deferred compensation items, ineligible deferred compensation items, specified tax-deferred accounts, and interests in non-grantor trusts.

Key procedural requirement:

You must file Form 8854, the Initial and Annual Expatriation Statement, for the year you expatriate. It carries the balance sheet and the exit-tax calculation, and it is where the certification is made. It is attached to your income tax return for the year that includes your expatriation date and filed by that return’s due date, including extensions.

United Kingdom Exit Tax Rules and Domicile Considerations

The UK does not have a formal "exit tax" in the American sense, but it does impose departure charges under its non-resident capital gains tax rules and through the concept of "domicile."

Non-resident capital gains tax (NRCGT):

If you are a UK resident and sell UK residential property after you become non-resident, you may owe capital gains tax in the UK on the gain, even though you no longer live there. The HMRC guidance on residential property gains explains the scope and rates.

Domicile and deemed disposal:

British citizens and individuals with a long history of UK residency may have a UK domicile for tax purposes, even after moving abroad. If you are domiciled in the UK, HMRC may treat certain asset sales as UK-source income and tax them accordingly. The rules around domicile are complex and depend on factors like your parents' domicile, length of residence, and where you intend to spend your final years.

Practical steps:

Notify HMRC of your departure using SA302 declaration
File a final self-assessment return for the tax year in which you leave
Consider the timing of asset sales in relation to your residency change date

UAE Tax Position: A Simpler but Context-Dependent Picture

The United Arab Emirates has no personal income tax and therefore no exit tax on individuals. However, this simplicity masks important nuances for expats planning departure.

What expatriates should know:

No UAE personal income tax on salary, investment gains, or property sales
No exit or departure tax
However, you remain subject to your country of citizenship or new residency country's tax obligations

Documentation on departure:

While the UAE Federal Tax Authority does not impose personal income tax, it is prudent to:

Obtain a final residency status confirmation from the UAE General Directorate of Residency and Foreigners Affairs (GDRFA)
Ensure all employment and salary certificates are in order for your next country's tax authorities
Document your UAE departure date for your new country's residency commencement date

Timing matters for your home country:

If you are a UK resident moving to the UAE, for instance, your change of residency out of the UK on a specific date determines when you cease to be a UK tax resident. Similarly, US citizens working in the UAE must still file US tax returns and may claim the Foreign Earned Income Exclusion—exiting the UAE changes nothing about US filing obligations.

Critical Pre-Departure Planning Steps

1. Establish Your Residency Status and Timing

Tax residency is not determined by citizenship. It is usually defined by the number of days you physically spend in a country during a tax year, or by where you maintain permanent accommodation and centre of vital interests. Before you move:

Calculate your residency status in both the country you are leaving and the country you are entering
Confirm the exact date you will become non-resident in your departure country
Understand whether your new destination has a tie-breaker rule (e.g., treaty provisions that resolve dual residency)

2. Identify and Value Your Taxable Assets

Exit tax and departure charges apply to gains, so you must know your asset base and cost basis:

Investment properties and real estate
Shares in private companies or substantial shareholdings
Securities and mutual funds
Pension pots and retirement accounts (which may have special rules)
Intellectual property or business goodwill
Collectibles and high-value personal property (less commonly taxed)

Obtain professional valuations before your departure date. This is not optional if you expect the IRS or HMRC to scrutinise your exit-tax filing.

3. Review Tax Treaties and Exclusions

Most countries with exit tax have exclusions or reliefs:

The US exclusion on gains, set by your year of expatriation - $890,000 for 2025, $910,000 for 2026
UK non-resident capital gains tax applies only to UK property, not worldwide assets
Treaty provisions that may allow deferral or relief

A mistake here can cost tens of thousands of pounds, dollars, or dirhams.

4. Structure Asset Disposals Strategically

If you have substantial unrealised gains and you know you are leaving:

Consider selling high-gain assets before your residency change date, if you remain a resident (you may be able to spread the tax over multiple years or claim different rates)
Alternatively, hold appreciated assets until after departure—depending on your new country's rules, you may escape exit tax but assume a new cost basis in your destination country
Document the strategy clearly for your tax filing

5. File Exit-Tax Paperwork Meticulously

If you are a US expatriate:

File Form 8854 and Schedule D (or Form 8949) in your final year
Attach a detailed statement calculating the mark-to-market value of each major asset
Ensure your expatriation date is unambiguous

If you are a UK resident departing:

File your final self-assessment return declaring your departure date
Disclose any UK property holdings and anticipated disposal plans
Consider professional valuation of any UK real estate

Common Pitfalls and How to Avoid Them

Underestimating the scope of exit tax: Many people assume exit tax applies only to their home country. In reality, both the US and UK can claim exit tax, and you may be subject to both if you are a dual citizen. Plan accordingly.

Confusing residency with citizenship: You can be a US citizen and a UK resident, or vice versa. Each has its own tax rules. Do not assume your passport determines your tax obligations.

Missing the filing deadline: If you owe exit tax and miss the deadline, penalties and interest compound quickly. In the US, Form 8854 must be filed by the deadline of your final tax return (including extensions).

Forgetting about pension funds: Retirement accounts (IRAs, pensions, ISAs) may have special exit-tax treatment or may trigger unexpected taxes on departure. Do not overlook them.

Failing to document asset valuations: The IRS and HMRC will challenge valuations that lack professional support. Obtain appraisals or broker statements on your departure date.

The Role of Professional Guidance

Cross-border exit tax is inherently complex because it sits at the intersection of multiple jurisdictions' laws. Even small errors in interpreting residency, calculating gains, or determining which assets are in scope can result in years of compliance headaches or significant overpayment.

At Next Tax Source, every exit-tax plan and filing is reviewed and signed by our licensed reviewer — an IRS Enrolled Agent (US) who is also ACCA-qualified (UK) — or an FTA-registered tax agent (UAE). We help business owners, founders, and expats:

Map their exit-tax exposure early
Time asset sales and residency changes strategically
Prepare Form 8854, self-assessment returns, and supporting documentation
Navigate dual-residency and treaty issues

Key Takeaways

Exit tax is real and significant for high-net-worth individuals leaving the US or UK. In the US it applies to unrealised gains on your property as at the day before your expatriation date, and only if you are a covered expatriate on one of the three tests.
Timing is critical. Your residency change date, asset valuations, and any property sales must be coordinated carefully.
Professional valuation is essential. Do not guess the fair market value of your assets on departure day.
Plan early. Last-minute exit-tax planning often leaves strategies off the table that could have saved tens of thousands of pounds or dollars.
Consider all jurisdictions. If you are a dual citizen or have lived in multiple countries, you may face multiple exit-tax regimes.

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Ready to Plan Your Cross-Border Move?

If you are a business owner, founder, or expat planning to relocate internationally, exit tax and residency change are too important to handle alone. Book a consultation with one of our licensed tax professionals to map your exposure and develop a compliant, tax-efficient exit strategy. We serve clients in the USA, UK, and UAE—and we understand the unique pressures of moving your life and your business across borders.

View our pricing and service options to find the right engagement level for your situation.

Frequently asked questions

Do I owe US exit tax if I am a permanent resident (green card holder) moving abroad?+

Only if you were a long-term resident, you end that resident status, and you meet one of the three covered-expatriate tests under section 877A. You are a long-term resident if you held lawful permanent resident status in at least 8 of the last 15 tax years ending with the year you stop being treated as one - leaving out years in which you were treated as a treaty resident of another country and did not waive the treaty benefits. Note that is counted in *tax years*, so a single day of green card status makes a whole year count. Below that count you are not a long-term resident at all, so the expatriation rules and Form 8854 do not apply to you. Have the count and the tests confirmed before you leave.

If I move from the UK to the UAE, will I owe UK exit tax?+

The UK does not impose a formal exit tax, but if you own UK residential property, you may owe UK capital gains tax when you sell it as a non-resident. You should also notify HMRC of your departure and file a final self-assessment return for the year you leave.

What is the difference between residency and domicile for UK tax purposes?+

Residency depends on your physical presence (days spent in the UK in a given year). Domicile is a deeper concept based on where you are deemed to have a permanent home and centre of vital interests. A person can be non-resident but still domiciled in the UK for tax purposes, which affects capital gains tax and inheritance tax on certain assets.

Do I have to sell my assets before I leave the country to avoid exit tax?+

No. In the US the charge is computed on a mark-to-market basis as at the day before your expatriation date, whether or not you sell anything. Strategic timing of sales before and after departure can still change your overall position, in the US and in the country you are moving to, and that is worth modelling in advance.

What if I have retirement accounts (401k, IRA, pension) when I expatriate?+

They are not treated like ordinary investment accounts. For US purposes a specified tax-deferred account - an IRA, for example - is one of the four classes of asset carved out of the deemed sale: instead of being marked to market, you are treated as receiving "a distribution of your entire interest in the account on the day before your expatriation date". Deferred compensation items are also outside the deemed sale and are handled by withholding at source or by immediate inclusion, depending on whether they qualify as eligible. Non-US pensions bring their own treaty and reporting questions on top. Professional review is essential here, because the mechanics differ by account type rather than following one rule.