Expatriation Exit Tax & Day-Counting: Form 8854 for Covered Expatriates

The US exit tax applies only to covered expatriates, people who renounce US citizenship or end long-term green card status and trip one of three tests (net worth, average tax liability, or failure to certify five years of tax compliance). If you are covered, IRC 877A treats you as having sold everything you own at fair market value the day before you expatriate, and taxes the net unrealized gain above an inflation-adjusted exclusion. Day-counting matters because the rules that pull you into this regime, especially the 8-of-15-year green card test, turn on how many tax years you were a US person, not on a single calendar date.

Who the exit tax applies to

Two groups can be hit: US citizens who formally renounce, and long-term residents (LTRs) who give up a green card or are treated as having abandoned it under a tax treaty. An LTR is a lawful permanent resident in at least 8 of the last 15 tax years ending with the year of expatriation. Crucially, those years don't have to be consecutive, and a year counts even if you held the green card for only part of it. That single quirk catches more people than any other.

Expatriation itself is not automatically taxable. The exit tax only bites if you are a covered expatriate. You become covered if you meet any one of three tests below. Citizens who renounce a second citizenship they held from birth, or who expatriated before age 18½, can sometimes escape coverage even if they hit a threshold, but most people are tested on the three core criteria.

The 8-of-15-year green card trap

Green card holders rarely think of themselves as exit-tax candidates, but the LTR definition is unforgiving. Because a partial year of permanent residence counts as a full year, someone who held a green card from, say, late December of year one through early January of year eight can hit 8 tax years while having been physically present for far less than eight calendar years. This is where careful day and year tracking becomes a planning tool rather than an afterthought.

• Count tax years, not 365-day blocks. Any year in which you were a lawful permanent resident for any part of the year is a counted year.
• Years in which a tax treaty made you a resident of the other country (and you claimed treaty benefits as a non-US resident) generally do not count toward the 8, but claiming that treaty position can itself be treated as expatriation.
• Abandoning the green card one year too late can flip you from a clean exit into a covered expatriate with a mark-to-market bill.
• The 15-year window ends with the year of expatriation and looks backward, so timing an abandonment near a year boundary can change the count.

How the mark-to-market tax works

If you are a covered expatriate, IRC 877A imposes a deemed sale: you are treated as having sold all of your property at fair market value on the day before your expatriation date. The net gain, gains minus losses across the deemed sale, is reduced by a sizable inflation-adjusted exclusion amount (well into the high six figures, and indexed upward each year), and the remainder is taxed as if you had actually sold. You can elect to defer tax on specific assets, but deferral requires adequate security (often a bond) and a waiver of treaty benefits, and interest accrues until you pay.

Some asset classes sit outside the deemed-sale rule and follow their own regimes. Deferred compensation (like pensions and certain retirement accounts) and specified tax-deferred accounts (such as IRAs) are handled separately, often via withholding or a deemed distribution, and interests in non-grantor trusts are subject to a special 30% withholding on future distributions rather than a one-time deemed sale.

Form 8854 and the timing that matters

Expatriation has two moving parts: the expatriating act and the tax filing. For citizens, the act is renouncing before a consular officer (or another qualifying act); for LTRs, it is abandoning the green card or filing a treaty position as a non-resident. But for tax purposes you are not finished until you file Form 8854 with your final return. That form makes the compliance certification, reports your net worth, and computes any 877A liability. Filing it is also what closes the loop on the certification test: even a non-covered expatriate generally must file Form 8854 to confirm they are not covered, and skipping it can leave you treated as a covered expatriate by default.

The expatriation date sets the year of your final return and the valuation date for the deemed sale. The portion of the year before that date is taxed as a US resident; after, generally as a nonresident. That split makes the calendar genuinely consequential, see how a partial year is handled in our dual-status year guide. Getting the date and the year count right is the whole game, which is why methodical record-keeping with a day counter beats reconstructing it later.

Planning before you expatriate

Because all three tests look backward over multiple years, the meaningful planning happens before the expatriating act, sometimes years before. The levers are mostly about managing your year count, your net worth on a single date, and your compliance record.

• Track LTR years precisely. Know exactly which tax years you held permanent residence, and consider whether surrendering before hitting 8 years avoids coverage entirely.
• Clean up compliance first. File any missing returns, report foreign accounts, and resolve issues so you can truthfully certify five clean years, this is the cheapest way to dodge coverage.
• Mind the net-worth snapshot. Net worth is tested on the expatriation date, so the valuation date and your asset mix on that day matter.
• Coordinate with treaty positions. A treaty tie-breaker claim can be an expatriating act for LTRs, review our tie-breaker primer before claiming one.
• Keep proof. Consular records, abandonment dates, and a contemporaneous presence log all support your timeline if questioned.

The throughline is that expatriation is a tax-year event built on a long lookback. Whether you owe nothing or face a mark-to-market bill on your worldwide assets often comes down to a year count and a single date, exactly the kind of thing worth tracking deliberately rather than guessing at the end. If you are still inside the US residency system, our substantial presence calculator and SPT guide help you understand the residency you are leaving.