Your daughter has made a mistake. If she is a full-time student and is only 21 you CAN claim her as a dependent and SHE needs to amend her return to say that she can be claimed. You can claim her as a dependent and thus file as Head of Household. You should also receive the $1400 stimulus for claiming her as a dependent.
You cannot file as HOH unless you claim a qualifying dependent---and your daughter is that dependent. That box you see is used by divorced or not-married couples who are using a signed agreement that allows one parent to file as HOH while the other one claims the child as a dependent.
Am I Head of Household?
https://ttlc.intuit.com/questions/1894553-do-i-qualify-for-head-of-household
https://ttlc.intuit.com/questions/2900097-what-is-a-qualifying-person-for-head-of-household
If you qualify as Head of Household, when you enter your filing status (single or married filing separately) into MyInfo, and then enter your qualifying dependent, TurboTax will offer HOH as your filing status.
For your daughter:
https://ttlc.intuit.com/community/dependents/help/when-do-i-have-to-answer-yes-to-being-claimed-as-a...
Your daughter can be claimed as a qualifying child---she is under 24, and is a full-time student. The amount of income she earned is irrelevant.
WHO CAN I CLAIM AS A DEPENDENT?
You can claim a child, relative, friend, fiance (etc.) as a dependent on your 2020 taxes as long as they meet the following requirements:
Qualifying child
•They are related to you.
•They cannot be claimed as a dependent by someone else.
•They are a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
•They are not filing a joint return with their spouse.
•They are under the age of 19 (or 24 for full-time students).
- No age limit for permanently and totally disabled children
• They live with you for more than half the year (exceptions apply).
Qualifying relative
•They don't have to be related to you (despite the name).
•They cannot be claimed as a dependent by someone else.
•They are a U.S. citizen, resident alien, national, or a Canadian or Mexican resident.
•They are not filing a joint return with their spouse.
•They lived with you the entire year.
•They made less than $4300 (not counting Social Security)
•You provided more than half of their financial support. More info
When you add someone as a dependent, we'll ask a series of questions to make sure you can claim them.
Related Information:
•Does a dependent have to live with me?
•What does "financially support another person" mean?
•Can I claim a newborn baby?
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
