My 20 year old daughter lived with me while she was a full time student. I do not claim her as a dependent. I should be able to still claim head of household but can't.

[DoninGA]

If you are not married and do not have a qualifying person as a dependent then you cannot have Head of Household filing status.  You can only file as Single.

TurboTax support FAQ for Head of Household - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualify-head-household...

[Vanessa A]

Is there a reason you are not claiming her as a dependent?

You cannot claim head of household if you do not have a dependent.  In order to claim Head of Household, you would need to claim her.

To qualify, you have to meet certain criteria. To file as Head of Household, you have to:

• Pay for more than half of the expenses for a qualifying household
• Be considered unmarried on the last day of the tax year
• Have a qualifying child or dependent  

[Mike9241]

your daughter must indicate on her return that she can be claimed as a dependent if you or anyone else is eligible to claim her

you can claim him/her as a qualifying child if all these tests are met
• he/she has the same principal abode as you for more than ½ the tax year. Temporary absences like for school are ignored
• if he/she is not a full-time student, he's under 19 at the end of the tax year. If a full-time student, he's under 24 at the end of the tax year.
• he/she hasn't provided over ½ his own support
• he/she didn't file a joint return unless there was no tax liability but merely filing joint to facilitate refund of taxes withheld or estimates paid

or you can claim him/her as a qualifying relative if all these tests are met
• his/her gross income for 2023 less than $4,700
• you provided over ½ his/her support
• he/she isn't a qualifying child of another taxpayer

support

• Includes amounts spent for food, lodging, clothing, education, medical and dental expenses, recreation, transportation and other necessities