Deductions & credits

 You got a letter 6419 that showed how much you received from July to December and you had to enter that amount.   The other part of the CTC that you are eligible to receive on your 2021 tax return ends up on line 28.   If you did not have enough tax withheld from your income throughout the year, then it is possible you owe tax to the IRS.   That credit you see on line 28 is being applied to the amount you would otherwise owe.   Have you entered ALL of your 2021 income and all of the tax you had withheld from your W-2's yet?   If you have not entered the tax withheld from box 2 of your W-2's, or entered any estimated tax paid during 2021, your calculations are not accurate yet.

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