February 1st, 2016.-
Permanent residents are free to travel outside the United States, and temporary or brief travel usually does not affect your permanent resident status. A general guide used is whether you have been absent from the United States for more than a year.
If you plan on being absent from the United States for longer than a year, it is advisable to first apply for a reentry permit on Form I-131. Obtaining a reentry permit prior to leaving the United States allows a permanent or conditional permanent resident to apply for admission into the United States during the permit’s validity without the need to obtain a returning resident visa from a U.S. Embassy or Consulate abroad. Please note that it does not guarantee entry into the United States upon your return as you must first be determined to be admissible; however, it will assist you in establishing your intention to permanently reside in the United States.
If you remain outside of the United States for more than 2 years, any reentry permit granted before your departure from the United States will have expired. In this case, it is advisable to consider applying for a returning resident visa (SB-1) at the nearest U.S. Embassy or Consulate. An SB-1 applicant will be required to establish eligibility for an immigrant visa and will need a medical exam. There is an exception to this process for the spouse or child of either a member of the U.S. Armed Forces or civilian employee of the U.S. Government stationed abroad on official orders. If the application for Returning Resident Status is approved by the consular officer, the Consular Section will send you more detailed information on how to proceed with applying for the visa. For more information on obtaining a returning resident visa, see the Department of State’s webpage on returning resident visas.
Additionally, absences from the United States of six months or more may disrupt the continuous residency required for naturalization. If your absence is one year or longer and you wish to preserve your continuous residency in the United States for naturalization purposes, you may file an Application to Preserve Residence for Naturalization Purposes on Form N-470.