QUOTE(Mononoke28 @ Mar 11 2008, 03:59 PM)

So the cutoff date is a year after departure? I have an older aunt who went back to Colombia and after 6 months she decided not to come back, yet my cousins (her children) were wondering if she could come back within a year of having left and then file an I-131 when she leaves next time.
The cut-off date for using just the permanent resident card to re-enter is one-year. However, technically, the date you decide you no longer intend to come back is supposed to be the date you lose your permanent resident status and are no longer entitled to returning resident status. You can also formally declare that you intend to abandon permanent resident status by giving a consular officer
Form I-407, or by simply applying for a non-immigrant visa to return to the U.S.
Practically, however, upon return the burden of proof upon return is on the immigration service to determine that you abandoned your U.S. residence, and thus your status as a permanent resident. There are two cut-off dates involved here, but these have nothing to do with the general requirement that, at all times since departure, you intended and actually maintained your permanent residence in the U.S. in order to be entitled to returning resident status:
1) Abroad less than 6 months---not to be treated as an applicant for admission or inspected for any grounds of inadmissibility upon return claiming status as a returning resident.
2) Abroad more than 6 months but less than 1 year---treated as an applicant for admission and may be inspected for admissibility and denied admission if found to be inadmissible upon return claiming status as a returning resident.
3) Abroad more than 6 months---same as #2, but additionally requires a re-entry permit or returning resident (SB-1) immigrant visa in order to be re-admitted as a returning resident.