Physical Presence Test

The physical presence test is one of the two tests a US citizen or resident can use to qualify for the foreign earned income exclusion, the other being the bona fide residence test. Under Internal Revenue Code section 911(d)(1)(B), a person meets it if they are physically present in a foreign country or countries for at least 330 full days during any period of 12 consecutive months. The person must also have a tax home in a foreign country, but the distinctive feature of this test is the day count: it does not ask whether the person intends to live abroad or has established roots, only whether they were physically there for enough days.

That mechanical quality is the reason people choose it. Someone who moves abroad partway through a year, or whose situation is too new or too temporary to clearly establish residency, can still qualify by counting days. The 330 days need not be consecutive and need not fall in a single country, so long as they are all spent in foreign countries within the same 12-month window.

A "full day" is stricter than a calendar day, and this is where day counts go wrong. A full day means a continuous period of 24 hours beginning at midnight and ending at the next midnight, spent entirely within a foreign country. The day you fly out of the United States and the day you fly back generally do not count, because part of each is spent in the United States or in transit. Time spent traveling over international waters does not count toward any foreign country, so a long flight or a sea voyage between two foreign points can cost a day. The upshot is that 330 full days is not the same as 330 days abroad on a calendar, and travelers who cut it close often find they are short once the partial days are removed.

The 12-month window is flexible, and choosing it well is the whole game. The period can start on any day of any month; it does not have to be a calendar year. A taxpayer picks the 12 consecutive months that contain the most days abroad, which lets someone who arrived in, say, March qualify by running the window from a date in one year to a date in the next. Because only 330 of the 365 days need to be foreign full days, the test tolerates up to 35 days back in the United States within the window, which covers ordinary home visits.

Proration links the test back to the exclusion. Qualifying under the physical presence test rarely lines up neatly with a single tax year, so the foreign earned income exclusion is prorated. The maximum exclusion for the year is multiplied by the number of qualifying days that fall within that tax year divided by the total days in the year. A person whose qualifying 12-month window overlaps a given calendar year for, say, 250 days can exclude only that fraction of the annual maximum on that year's return, with the balance of the window falling into the adjacent year's proration.

The physical presence test and the bona fide residence test answer different questions. The bona fide residence test under section 911(d)(1)(A) asks whether the person is a genuine resident of a foreign country for an uninterrupted period that includes an entire tax year, which is a facts-and-circumstances judgment about intent, ties, and permanence. The physical presence test asks only for a day count. A newcomer abroad usually leans on the physical presence test in the early years and may switch to the bona fide residence test once genuine residency is established, since the latter does not cap US visits at 35 days.

The process is: identify a tax home in a foreign country, choose a 12-month window, count the full days spent in foreign countries within it, and if the count reaches 330, use it to qualify for the foreign earned income exclusion, prorated to each tax year the window touches.

A hypothetical example of the day count and proration. Sofia moves to Mexico on March 15 and stays, returning to the United States only for a two-week visit that summer. She chooses a 12-month window running from March 16 of the move year to March 15 of the next year. Within it she spends 350 full days in Mexico and 15 days in the United States, comfortably clearing the 330- day requirement even after removing her arrival and departure days. Her window overlaps the move year for the days from March 16 through December 31, which is 291 days. The maximum foreign earned income exclusion for that year, $132,900, is prorated: she can exclude 291/365 of it on the move-year return, roughly 80 percent of the annual maximum. The remaining days of the window fall in the following year and are prorated on that year's return.

The physical presence test is one route to a benefit, so the comparison that matters is against the bona fide residence test.

Where the physical presence test is the better route

• It is mechanical. Meeting it is a matter of counting days, not persuading the Internal Revenue Service that you are a genuine resident.
• It works from the first eligible 12-month window, so a person who moved abroad partway through a year can qualify without waiting for a full tax year of residency.
• The 12-month window can be positioned to capture the most days abroad, which gives flexibility a calendar-year test would not.

Where it is the harder route

• It caps US presence at 35 days within the window, so anyone who spends more time in the United States fails it, however clearly they live abroad.
• Full-day counting is unforgiving: arrival and departure days and travel over international waters do not count, and a miscount can disqualify a whole year.
• Because it rarely aligns with a tax year, the exclusion is prorated, which splits the benefit across two returns and requires careful tracking.
• It does not by itself establish foreign residency, so it does not carry the broader treaty and residency advantages the bona fide residence test can.