Child Tax Credit

Pursuant to the Act, the child tax credit is increased to $2,000 per eligible child for 2018 through 2025.

The income level at which the credit phase-out begins is increased to $400,000 for taxpayers filing married filing jointly and $200,000 for all others. The credit continues to phase out at a rate of $50 for every $1,000 that AGI exceeds the threshold amounts.

The refundability of the credit was also modified so that the earned income threshold is reduced to $2,500.

The credit of $1,000 per eligible child.

A qualifying child for purposes of the child tax credit is a child who is your son, daughter, stepchild, foster child, brother, sister, stepbrother, stepsister, or a descendant of any of them (for example, your grandchild, niece, or nephew) and
was under age 17 at the end of the current year,
Did not provide over half of his or her own support for the current year,
Lived with you for more than half of the current year
Is claimed as a dependent on your return,
Does not file a joint return for the year
Was a U.S. citizen, a U.S. national, or a U.S. resident alien.

Only those families that make less than $110,000 annually are eligible for the full credit. Families making between $110,00 and $130,000 receive a reduced credit (specifically $50 per $1,000 made over $110,000). Individuals who are unmarried must have earned under $75,000 to qualify for this credit. Taxpayers who are married but filing separate returns must have made no more than $55,000.

They must not have reached the age of 17 by the end of the tax year.
Children may be your blood children, grandchildren, step children, and / or adopted children. Foster children also fall under this category as long as they have lived in your home for the entire year in question.
Qualifying children must be citizens or residents of the United States who can be claimed as dependents by the taxpayer.

If the Child Tax Credit is larger than your tax liability, the unused part of the Child Tax Credit can be refundable as an additional Child Tax Credit.
The portion that is available for a refund depends on the number of children you have, your total earned income, and, sometimes, the amount of taxes you have paid over the year to Social Security and Medicare.
Use Form 8812 to claim the Additional child Tax Credit.