I’m getting married in March. Since I will be married when I file my taxes, do I file married?
Nope. For federal income tax purposes, your filing status is determined as of the last day of the tax year (so, in this case, December 31, 2010). If you were single on that day, you file as single (or head of household, if applicable) even if you are married when you file your tax return.
Whether you are considered married is determined by state law; the exception to this rule is single sex marriage which is not recognized by the federal government even if legal in your state.
Congratulations on your upcoming marriage and good luck!
Like any good lawyer, I need to add a disclaimer: unfortunately, it is impossible to offer comprehensive tax info over the internet, no matter how well researched or written. And remember, I love my readers but having me bookmarked on your computer doesn’t make you a client: before relying on any information given on this site, contact a tax professional to discuss your particular situation.