What Does "Considered Unmarried" Mean for Head of Household?
Married on paper, unmarried for tax purposes
Federal filing status usually tracks your legal marital status on December 31. But the tax code carves out one important exception: a person who is still legally married can be "considered unmarried" and file as head of household, which comes with a larger standard deduction and wider brackets than married filing separately. This page explains that test. For the basics of the five statuses, see our overview of filing status and why it matters.
This rule matters most for people who are separated but not yet divorced — often a parent who has been living apart from a spouse and supporting kids on their own.
The five conditions
IRS Publication 501 sets out the test. To be considered unmarried for head of household purposes for a given tax year, all of the following must be true:
- You file a separate return from your spouse — not a joint one.
- You paid more than half the cost of keeping up your home for the year. "Cost of keeping up a home" includes rent or mortgage interest, property taxes, utilities, repairs, and food eaten in the home; it does not include things like clothing, education, or vacations.
- Your spouse did not live in your home at any time during the last six months of the tax year. A spouse who is only temporarily away — for work, medical care, military service, or school — still counts as living in the home, so a temporary absence doesn't satisfy this condition.
- Your home was the main home of your child, stepchild, or eligible foster child for more than half the year.
- You must be able to claim the child as a dependent — with an exception: if the only reason you can't claim the child is that you released the claim to the noncustodial parent under the divorced-or-separated-parents rules, you can still meet this test.
Miss any one condition and you're back to the married statuses — usually married filing separately, if you and your spouse aren't filing together.
Why the six-month rule trips people up
The last-six-months condition is strict about the calendar. If your spouse moved out in August, they lived in the home during the last six months of the year, and you're not considered unmarried for that year — even if the separation is permanent. On the other hand, a legal separation under a state decree of divorce or separate maintenance can make you unmarried for filing purposes under a different rule, without needing this test at all. Publication 501 covers both paths.
What head of household changes
The payoff for meeting the test is the head of household standard deduction and bracket schedule, which sit between single and married filing jointly. Because tax brackets apply to your taxable income after the standard deduction, a bigger deduction and wider brackets can both lower the bill compared with filing separately. The filing-status chapter of Publication 17 walks through the comparison in detail.
Check your situation before you file
Because this test hinges on dates, dollars, and dependency rules all at once, the safest move is to run your facts through the IRS's What Is My Filing Status? interactive assistant. It asks about your marriage, your home, and your children for the specific year and tells you which status the rules support — useful to have settled before you sit down to file.