Anyone that is a Lawful Permanent Resident (LPR) and is outside of the U.S. for 180 days or more within any 12 month period (not necessarily calendar year) creates a rebuttable presumption of abandonment of residency. That presumption can be rebutted by evidence to the contrary such as filing U.S. taxes, maintaining a home in the U.S. and paying that mortgage or rent, maintaining a U.S. drivers license, U.S. bank accounts with significant movement, etc.
Someone that has been outside of the U.S. for more than 1 year without first having an approved re-entry permit has abandoned their residency and only in very few exceptions (such as serious illness) can they get it back.
Here is an official link:
So the idea would be that you should spend 181 days or more in the U.S. out of every 12 months. So it would be fine to spend 2 months and maybe a day or two in the U.S., then 2 months outside, then come back for 2 months to the U.S., etc. As long as you have just a little more time in the U.S., that should be fine. If you need to spend more time outside, you should file for an I-131 Re-Entry Permit which will let you stay outside of the U.S. for up to 2 years without losing your U.S. Lawful Permanent Residency. Here is a link:
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I think you may have misunderstood? I am a UK citizen and my fiance is a USA citizen, I would be staying in the USA for 2 months at a time and coming home to the UK for a month at a time.
Eventually maybe. What i want to know right now is it possible for me to do what i asked for the next year or two till i make a final decision.
I just want to be able to go using my UK passport and my ESTA visa, stay for two months, come home to the UK for a month and then return to the USA for anther two months.
Technically, you can do that. However, the more you do that, the harder it will become and you may need to eventually be able to respond to the following questions or they may not let you in:
1) Why are you coming back so soon?
2) Why you couldn't do what you needed to do during the last trip?
3) How will you be supporting yourself for this additional time since you are not allowed to work?
4) What STRONG ties do you have to your home country to ensure that you will go back?
5) What preparations have you made to go back?
If they are not satisfied with that, they could deny you entry into the U.S. So you have to be prepared. Also, here is a link that I can give you of things that you can have with you to prove non-immigrant intent and strong ties to your country. Here is the link:
Once you are married to the U.S. Citizen, it will become much harder. Why? Because apart from every non-U.S. Citizen automatically be assumed to be a potential immigrant (which is why you have to prove that you are not), once a person is married to a U.S. Citizen, they automatically assume that they want to enter on a Visa Waiver or B-2 just because they do not want to wait stuck outside the 9 months or more processing time to apply for an immigrant visa. So again, it will be much harder, but if you have strong proof of non-immigrant intent and strong ties to your home, then technically it is possible.
It is a dangerous situation with risks, but if you are eventually denied, you can apply for a B-2 and try again, or you can have your spouse finally apply for you to get an immigrant visa, then get your Residency, and then do as I originally explained and get a Re-Entry Permit to come in and out with almost no issues like you would have now with the questioning and proof. I was just trying to make it easier on you.