Deductions & credits

You lose the child tax credit when the child turns 17.   If the child was older than 16 at the end of 2024, you get the $500 credit for other dependents instead.

 

https://www.irs.gov/help/ita/does-my-childdependent-qualify-for-the-child-tax-credit-or-the-credit-f...

 

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