I am assuming you mean, your mother claimed you as a dependent on her return. When you say half of the year, does that means you lived with her for half of the year? Depending on who provided OVER ...
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I am assuming you mean, your mother claimed you as a dependent on her return. When you say half of the year, does that means you lived with her for half of the year? Depending on who provided OVER half of your support for the year determines who can claim you. It is not done per half of year it is calculated for the entire year.
So, if you graduated from College in May and moved out in June and fully supported yourself from that point on, it is very likely she cannot claim you as a dependent and she would need to amend her return to remove you.
If however, YOU did NOT provide over half of your own support for the year, then you can change your return by going to the personal info section, and selecting edit, then selecting that someone else can and will claim you on their return this year.
To claim someone as a Qualifying Relative, they must be:
Your child ( including step children, adoptive children and foster children) or a descendent of them
Your sibling (including half siblings) or a child of your sibling or a sibling-in-law
Your parent or grandparents, including step parents and in laws
Any other person that lived with you for the entire tax year
Not a qualifying child of another taxpayer
Someone that you provided over half of their support for during the tax year
Has less than $5,200 in income (not counting social security)
The following criteria must be met to claim someone as a qualifying child:
Your child (including adopted and foster children), your sibling, or a descendent of any of them.
Age 18 or younger at the end of the tax year OR under 24 (and younger than you and your spouse) if they are a full-time student or any age if they are totally and permanently disabled
Lived with you for more than 6 months during the tax year
They did not provide more than half of their own support (social security does not count)
They did not file a joint return, unless it was to claim a refund