You can claim your girlfriend as a dependent if she passes all the following tests:
1.
The person can't be your qualifying child or the
qualifying child of any other taxpayer.
2.
The person must live with you all year as a member of your household
(and your relationship must not violate local law).
3.
The person's gross income for the year must be
less than $4,050.
4.
You must provide more than half of the person's
total support for the year.
5.
The person is a
U.S. citizen, U.S. resident alien, U.S. national.
6.
The person is not a
married person who files a joint return unless that joint return is filed only
to claim a refund of withheld income tax or estimated tax paid.
Your girlfriend is not a qualifying person to allow you to file as Head of Household and you must file as Single.
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