What this line means
Your tax liability after subtracting other nonrefundable credits. This is the maximum amount of child tax credit and credit for other dependents you can use to directly offset your taxes. You start with your tax from Form 1040 line 18, subtract credits from Schedule 3 line 1, and the result is the cap for the credits on Schedule 8812. Any credit amount above this limit flows to the additional child tax credit calculation.
Does this apply to you?
- You are calculating how much of your child tax credit and credit for other dependents can offset your tax
- You need to determine whether any excess credit qualifies for the refundable additional child tax credit
Easy to overlook
Other nonrefundable credits reduce the room for the CTC If you claim the foreign tax credit, education credits, or other nonrefundable credits on Schedule 3, those reduce your tax liability first. The remaining tax liability is the cap for Schedule 8812 credits. Filers with large foreign tax credits may find their CTC is limited even though their income qualifies for the full amount. 1 IRS Schedule 8812 instructions — tax liability limit computation
A low tax liability does not mean you lose the CTC entirely The nonrefundable portion is limited to your tax, but the excess child tax credit can become refundable through the additional child tax credit on lines 15-24. Low-income filers with little tax liability still benefit because up to $1,700 per child can be refunded. 2 IRC Section 24(b) — nonrefundable credit limitation
Watch out for this
Using total tax from line 24 instead of tax before credits from line 18. Line 14a starts with the tax on line 18, not the total tax after all additions on line 24. Using line 24 includes self-employment tax and other amounts that should not be part of this calculation.
Footnotes
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IRS Schedule 8812 Instructions, Tax Liability Limit. https://www.irs.gov/instructions/i1040s8 ↩
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IRC Section 24(b), Nonrefundable Credit Limitation. https://www.law.cornell.edu/uscode/text/26/24 ↩