note that if one itemizes both must or if one uses the standard deduction both must use it. if there's a disparity in income then MFS is usually worse. we can't see your calculations or returns but for example, if one has $70K in taxable income and the other has $20K then MFS is about $13K total in taxes while joint is only about $11K. MFS usually only makes sense if incomes are about equal or the one with the lower income has high medical expenses. MFS and you lose certain credits and deductions but perhaps these don't apply in your situation. also, note your filing status is married filing separately not single or head of household. if you live in a community property state, then the rules about reporting separate incomes can be complicated. You should always consult a tax professional in that case.
