Child tax credit.

The Child Tax Credit is a tax credit you can claim for each qualifying dependent child on your return. You can get up to $2,000 for each child under age 17 if your modified adjusted gross income (AGI) is less than:

• $400,000 if you're Married Filing Jointly or a Qualifying Surviving Spouse, or
• $200,000 for all other filing statuses

If your AGI is higher than that, the amount of Child Tax Credit you're eligible for is reduced by $50 for each $1,000 your modified AGI is above the income threshold. For example, if you're Married Filing Jointly making $401,000, you’re eligible for a total credit of $1,950. 

https://turbotax.intuit.com/tax-tips/family/7-requirements-for-the-child-tax-credit/L3wpfbpwQ 

The credit will directly reduce your tax due.  The credit can reduce your tax bill on a dollar-for-dollar basis.

@Mm285599Thanks for the question!!