Your low income is the reason. And you cannot get CTC for the 17 year old. The tax law changed.
The rules for getting the child tax credit on a 2021 tax return and now on a 2022 return are very different. For 2021 you could get $3600 for a child under 6 or $3000 for a child between 6 and 17 even if you had no income/did not work. That is NOT the way it will work for your 2022 tax return. The “old” rules are back. The maximum amount of the child tax credit is now $2000 per child; the refundable “additional child tax credit” amount is $1500. In order to get that credit, you have to have income from working. The credit is calculated based on the amount you earned above $2500 multiplied by 15%, up to the full $1500 per child. If your child is older than 16 at the end of 2022, you do not get the CTC. But you may still get the non-refundable $500 credit for other dependents instead.
https://ttlc.intuit.com/questions/1900923-what-is-the-child-tax-credit
https://www.irs.gov/help/ita/does-my-childdependent-qualify-for-the-child-tax-credit-or-the-credit-f...
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