It's 16 for the Child Tax credit, not 17.
You can still claim your child, as a dependent. What you can't claim is the Child tax credit. This comes as a big surprise to many parents the year their child turns 17. A child over age 16 no longer qualifies for the Child Tax credit (CTC). Although a child can still be a student dependent through age 23, and a qualifying child for EIC, the Child Tax Credit expires the year they turn 17 and you no longer get the $2000 CTC. Instead you will get the non-refundable (up to) $500 Other Dependent Credit.
: The initial amount of the CTC is $2,000 for each qualifying child. The credit amount begins to phase out where adjusted gross income (AGI) income exceeds $200,000 ($400,000 in the case of a joint return).
To be a qualifying child for the 2024 tax year, your dependent generally must:
You qualify for the full amount of the 2024 Child Tax Credit for each qualifying child if you meet all eligibility factors and your annual income is not more than $200,000 ($400,000 if filing a joint return).
To qualify for the $2,000 Child Tax Credit, your child must meet all of these requirements:
If your child was age 17 at the end of the tax year, he/she is not eligible for the $2,000 Child Tax Credit, but may instead be eligible for the $500 Credit for Other Dependents.
It's 16 for the Child Tax credit, not 17.
You can still claim your child, as a dependent. What you can't claim is the Child tax credit. This comes as a big surprise to many parents the year their child turns 17. A child over age 16 no longer qualifies for the Child Tax credit (CTC). Although a child can still be a student dependent through age 23, and a qualifying child for EIC, the Child Tax Credit expires the year they turn 17 and you no longer get the $2000 CTC. Instead you will get the non-refundable (up to) $500 Other Dependent Credit.
You do not select the Child Tax credit (CTC). If you are entitled to it, TurboTax (TT) will automatically give it to you.
There are 7 possible reasons; you aren’t getting the Child Tax credit (CTC). It’s usually #4:
To get a 'second opinion' on-line direct from IRS, try https://www.irs.gov/uac/is-my-child-a-qualifying-child-for-the-child-tax-credit
https://www.irs.gov/uac/Ten-Facts-about-the-Child-Tax-Credit