QUOTE(jynxNdragnfly @ Feb 19 2008, 07:35 AM)

didn't help at all LOL i want to know if he leaves it as single and we send it in if there will be a problem or does he have to go and amend everything to married (whether filed separately or together) I just don't want problems.
You can try doing a search, there are so many tax threads might be a bit tiresome to wade through them.
Hard to say if it will cause a problem when filing the I-864 - in theory part of your immigration proof includes a bonafide relationship - whether the tax status he chose will be taken in to consideration or not, I haven't really seen. From a financial point of view it shouldn't matter - they just want proof of his income and the status he filed under should be irrelevant.
If you are concerned about it, which you obviously are, perhaps he should file an amended return for the year. While they may not have a transcript available when you go to file the I-864 - since this is a busy time of year for the IRS, he can at least attach a copy of the 1040x to the transcript he does have, so they know he has filed it. He can then obtain a copy of the amended transcript for the actual interview.