Why it doen't give me an option to file as head of household?

Did you enter a qualifying person as a dependent?

 

See this TurboTax support FAQ for head of household - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualify-head-household-2021/L0NxUtVc2_US_en_US?uid=lfvld5y9

 

See this TurboTax support FAQ for qualifying person - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-filing-status/qualifying-person-head-household/L2TmgztNs_US_en_US?uid=lfvlduwy

There are specific requirements to be able to claim Head of Household.

  

You can qualify for Head of Household if you:  

• Were unmarried as of December 31 this year, and  
• Paid more than half the cost to run your home for the year (rent, mortgage, utilities, etc.) and  
• You supported a qualifying person.  
• If you are legally married as of December 31, and a child lives with you, you can qualify for Head of Household under a slightly different set of rules. Read more  

  

After you answer all the questions about yourself and your dependents at the beginning of your return, we'll let you know if your situation qualifies for Head of Household.  

  

You can also revisit these questions by selecting My Info (online) or Personal Info (software), then selecting Edit next to your name or your dependent's.