If you were filing as Single and had a qualifying dependent entered on your tax return and indicated that you paid for over one-half of the cost to maintain your home, the TurboTax program would have given you Head of Household filing status.
Did you first enter yiur qualifying related dependent?
TurboTax would have suggested HOH if you qualified.
If you filed and it was accepted then you can amend.
The amend function will be available after March 25.
If you filed, it is like dropping it into the mail - you cannot get it back if accepted by the IRS or state.
Do not rush to amend - no hurry. You have 3 years to amend and amended returns are taking 6 months or longer to be processed so waiting a few weeks will make little difference and amending too soon might just compound the problem.
To amend your 2020 tax return:
-- If accepted you should *wait* until your return has been processed and you receive your refund or conformation that any tax due has been paid. (If you file an amended return while you first return is being processed it can cause extended delays for both returns if two returns are in the system at the same time). In addition, if the IRS makes any change on your original return, you might end up having to amend the amendment – a sticky process that can take a year or more).
-- Then you can start the amend process.
It is suggested that it be mailed certified with return receipt (or other tracking service) to verify that the IRS receives it. That is the only proof of mailing that the IRS will accept.
-- Amended returns can be mailed or e-filed - allow 8-12 weeks - can take up to 16 weeks (4 months) for processing.
See this TurboTax FAQ for help with amending:
You can check the status of your amended return here but allow 3 weeks after filing for it to show up:
https://www.irs.gov/filing/wheres-my-amended-returnThe amend function will be available after March 25.