can i change from single to head of household

[DoninGA]

If you do not have a qualifying person as a dependent on your tax return you are not eligible for Head of Household.

[AmyC]

Yes, if you have a qualifying dependent. Take a quick quiz,  Dependent or see  Publication 501 - Internal Revenue Service page 11. If you have already filed as a single, you can amend your return to claim the dependent and change filing status. 

Taxpayers can use the Should I file an amended return? to help determine if they should file an amended tax return.

Once your original return is accepted and the finances are settled, you can file an amended return. 

• Save a copy of the original return before doing an amended return. 
• See: 
  • how to file an amended return. - have to scroll down and open for your software type to see current year information.
  • I need to amend my state return.
  • Can I e-file my amended state return?
  • Can I e-file my 1040X to amend my return?
• Track amended return status online. Taxpayers can track the status of their amended tax return in English and Spanish using Where’s My Amended Return?  Amended returns take up to 16 weeks to process and up to three weeks from the date of mailing to show up in the system.
• Mail forms with tracking to ensure your privacy is protected and the documents safely reach their destination.