[kristinecfp]

She can only file as Married Filing Jointly or Married Filing Separately (unless they separate - hopefully that won't be an issue yet!).

Both Sweeps and Disney are correct in that it is typically better to file MFJ. One point about MFS that hasn't been brought up yet - if one spouse elects to itemize their deductions, the other one MUST itemize as well. Since medical expenses came up several times in this thread, thought I better point that out. That could be a deal breaker if only one spouse has enough itemized deductions to beat the standard deduction.