Just found this site and wish I had years ago, if this has been asked before I apologise in advance but I've had a look and can't see it. I'm American and my wife is a British NRA who does possess a SSN, acquired about 15 years when we lived in the States and she worked in a local hospital. About 6 years ago we moved back here when we both retired. She never had many years working there so never got a pension but I'm in receipt of one so we live off mine. I've always done our taxes as married filing jointly even though she generates no income. This year however she's been working and will probably make about £12,000 and so NEXT year (2015) I was thinking of filing married but filing seperately...does the IRS frown on this, and am I even allowed to do it? I've yet to figure out if doing so will be advantageous, but would like to have the option if it is .... Sorry if it sounds like a silly question, and thanks in advance to anyone who could shed a little light on it...