How does the 330-day physical presence test work?

Use a consecutive twelve-month window

The measuring period can begin on any day of a month and does not need to match the calendar year. You may compare overlapping twelve-month windows to determine which supports the appropriate exclusion for a tax year. Within the selected period, you need 330 full foreign days, not simply eleven months abroad. A year with 365 days generally leaves 35 days that need not be full foreign days, but travel can consume that allowance. Count actual dates rather than relying on a rough monthly estimate.

Travel days need careful treatment

A full foreign day generally runs from midnight to midnight in a foreign country. Departure and arrival days often fail that requirement. Time over international waters or in international airspace generally is not time in a foreign country. Special travel rules can preserve qualification for certain short transits between foreign locations, so examine the itinerary instead of discarding or accepting every flight day automatically. U.S. territories are not treated as foreign countries for this exclusion. Keep tickets and travel records that show the route and timing.

The test does not replace the other requirements

You must separately establish a foreign tax home during the relevant qualifying period. The test is generally based on physical presence, not why you were abroad; vacation days in a foreign country can count toward presence. But counting those days does not turn passive income into earned income or make U.S. workdays foreign services. Serious events such as war or civil unrest may support a limited waiver only when the IRS conditions and designated-country rules apply. An ordinary personal emergency is not automatically a waiver.

A qualifying window may span two tax years

You can meet the test using a period that starts in one year and ends in the next. The exclusion for a particular return is generally limited by the eligible portion of that tax year and the applicable proration rules; passing the test does not give an unlimited full-year exclusion. The maximum is inflation-adjusted annually. If you need additional time to meet the test, Form 2350 may provide a filing extension when eligible. It generally does not extend the time to pay tax.

Common mistakes

• Counting every day outside U.S. borders as a full day in a foreign country.
• Claiming a full annual exclusion after qualifying for only part of the tax year.

Filing requirements

• Document the exact twelve-month period and full foreign days on Form 2555.
• Review extension options before the return deadline if the qualifying period has not finished.

Potential penalties

• A miscount can invalidate the exclusion and create additional tax, interest and applicable penalties.

Related IRS forms

• Form 2555
• Form 1040
• Form 2350

What to consider next

• Build a daily travel calendar including flights, U.S. visits and foreign stays.
• Confirm the foreign tax home and the eligible portion of each tax year.
• Have Chirino USA review the window, proration and any needed extension.