Check it out you can now use the online form to find out what your tax filing status is in the US. Just answer the questions and move on. This even works for us living abroad and have non resident alien husbands.
What is My Filing Status?
Your filing status is used to determine your filing requirements, standard deduction, eligibility for certain credits, and your correct tax. If more than one filing status applies to you, this interview will choose the one that will result in the lowest amount of tax.