If you're married at year-end, you've been married all year...

If you're married at year-end, you've been married all year for tax purposes. Credit: Handout

To the IRS, there's no such thing as a little bit married. Even if you're married on Dec. 31, it considers you married all year. But that shouldn't dramatically boost your tax bill.

A single taxpayer who earns $75,000 owes $12,500 in 2013 federal tax, assuming she takes a standard deduction, says Jill Schneider, a Syosset tax attorney. If you and your intended each earn $75,000 and take a standard deduction, and don't marry until 2014, together you'll owe $25,000 in 2013 federal income tax. And you'll owe only $300 more if you get married this year and pay your 2013 federal taxes as a married couple filing jointly with a standard deduction, says Schneider.

The alternative, filing married separately, is usually more expensive because it disqualifies you for some deductions and credits, and the tax rates are higher. Let's say you pay 2013 taxes filing married separately and taking a standard deduction. If one spouse earned the entire $150,000, he or she owes $35,000; the other spouse owes nothing. If each of you earned $75,000, each will owe $13,000.

However, filing separately can sometimes reduce a couple's tax bill -- for example, by letting them claim a big medical deduction or casualty loss against one salary. And it's a good idea if you're worried about your spouse's honesty, says Schneider. "When you file separately, you avoid legal and financial responsibility for each other's debts."

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