A green card is not a green card until it expires — the statute is structured the other way round. A returning permanent resident is not treated as seeking admission, which is the protection most trips never leave. But that protection has a closed list of exceptions, and one of them is a single absence of more than a hundred and eighty days. Crossing it revokes nothing. It changes what you are at the border.
The statute provides that a lawfully admitted permanent resident SHALL NOT BE REGARDED AS SEEKING AN ADMISSION into the United States for purposes of the immigration laws — UNLESS the person falls within one of the listed circumstances. That is the shape worth holding on to: returning home is the default, and the exceptions are a closed list. Most short trips do not engage any of them at all.
One of the listed circumstances is that the person HAS BEEN ABSENT FROM THE UNITED STATES FOR A CONTINUOUS PERIOD IN EXCESS OF 180 DAYS. Cross it and the default protection no longer applies: the returning resident is treated as an applicant for admission. The number is roughly six months, and it is the same rough length as the naturalisation continuity line — but they are different tests, in different statutes, with different consequences, and satisfying one says nothing about the other.
The statutory phrase is a continuous period in excess of one hundred and eighty days. It measures one absence, not the sum of a year's travel. Somebody who spends seven months abroad across four separate trips has not engaged this clause, while somebody who spends one stretch of one hundred and eighty-one days has. The naturalisation physical-presence requirement works the opposite way and counts the total — which is exactly why the two are so often mixed up.
Crossing the line changes the person's POSTURE at the border; it does not by itself cancel permanent residence. Whether residence has been abandoned is a separate, fact-specific question about intent and ties, decided elsewhere and not on this page. What is worth planning around is the change in posture, because it is predictable from a calendar — and because the way to address a long planned absence is to take advice BEFORE leaving, when options still exist, rather than at the airport on the way back.
Two deliberate omissions. This page names the re-entry permit and says nothing more about it: its requirements, its validity and its effect on this analysis were not established from a primary source when this page was verified, and a half-remembered account of the one document that addresses this problem would be worse than none. And it makes no judgement about whether a particular absence abandoned residence — that is a fact-specific determination about intent and ties, made by people with the whole picture in front of them. What this page does is tell you what a calendar predicts, which is the part you can plan around.
We already computed the public version — it is complete and stays free. Keep each trip’s dates in one place and the Square sees the long one coming: Join DesiSquare and the Square remembers your dates, re-runs this when the rules change, and puts a credentialed human one message away.