TurboTax is correct. You are able to claim your 18 year old as a dependent so you are able to file as Head of Household.
However, for tax year 2022, your 18 year old does not qualify for the Child Tax Credit. In tax year 2021, the American Rescue Plan raised the minimum Child Tax Credit to $3,000 per qualifying children ages 6 through 17.
You may qualify for the $500 Credit for Other Dependents. The credit allows taxpayers a credit for certain dependents that don't qualify for the Child Tax Credit, such as qualifying children age 17 or older, adult dependents, and dependents who have an Individual Taxpayer Identification Number (ITIN).
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