2026 Child Tax Credit — Phase-Out Thresholds, ACTC, and OBBBA Changes
Complete practitioner guide to the 2026 Child Tax Credit — $2,200 per child (OBBBA), ACTC refundability up to $1,700, phase-out at $400,000 MFJ, and One Big Beautiful Bill Act provisions. Updated for 2026.
2026 Child Tax Credit — What Practitioners Need to Know
The Child Tax Credit for 2026 remains at $2,200 per qualifying child (OBBBA) under age 17, with the Additional Child Tax Credit (ACTC) refundable portion at $1,700 per child per Rev. Proc. 2025-32. The credit phases out at $400,000 for married filing jointly and $200,000 for all other filers — a $50 reduction for each $1,000 (or fraction thereof) of income above the threshold.
The One Big Beautiful Bill Act (OBBBA) made the TCJA CTC provisions permanent, avoiding the cliff that would have reduced the credit to $1,000 per child in 2026. Practitioners should confirm client eligibility annually as the qualifying child definition, SSN requirements, and phase-out thresholds are subject to change.
Eligibility Rules and Qualifying Child Definition
A qualifying child for the CTC must meet all of the following tests under IRC §24: (1) Age test — under age 17 at end of tax year; (2) Relationship test — child, stepchild, foster child, sibling, or descendant; (3) Dependent test — must be claimed as a dependent; (4) Residency test — must have lived with the taxpayer for more than half the year; (5) SSN requirement — must have a valid SSN issued before the return due date (including extensions).
The SSN requirement is strictly enforced. An ITIN does not qualify for the CTC — only a Social Security Number issued by the Social Security Administration. Children born during the year qualify if they meet all other tests. Adopted children qualify if the adoption is final or the child has been placed with the taxpayer by an authorized agency.
ACTC Calculation and Refundability
The Additional Child Tax Credit (ACTC) is the refundable portion of the CTC. For 2026, the ACTC is limited to 15% of earned income above $2,500, up to $1,700 per qualifying child. This means a family with $20,000 of earned income and two qualifying children could receive up to $2,625 in refundable ACTC [(($20,000 - $2,500) × 15%) = $2,625, capped at $3,400 (2 × $1,700)].
Families with three or more qualifying children may use an alternative calculation: the excess of Social Security taxes paid over the EITC amount, if that produces a larger ACTC. Use Schedule 8812 to calculate both the CTC and ACTC. The IRS has strict due diligence requirements for practitioners claiming refundable credits under IRC §6695(g) — Form 8867 must be completed for every return claiming the CTC/ACTC.
Client: Single parent, 2 qualifying children (ages 8 and 11), earned income $35,000, no other income. Files as Head of Household.
CTC Calculation: Potential CTC: 2 × $2,000 = $4,000. Phase-out threshold for HOH: $200,000 — not applicable. Tax liability before credits: approximately $1,800 (after standard deduction of $22,500 for HOH 2026).
Result: CTC reduces tax liability to $0 (uses $1,800 of the $4,000 credit). Remaining $2,200 of unused CTC is potentially refundable as ACTC. ACTC calculation: ($35,000 - $2,500) × 15% = $4,875, capped at $3,400 (2 × $1,700). Actual ACTC: $2,200 (limited to unused CTC). Total refund from credits: $2,200.
Practitioner Note: Complete Form 8867 (due diligence checklist) and retain documentation of qualifying child status. The IRS audits ACTC claims at elevated rates — documentation is essential.
Client Conversation Script for Tax Professionals
Use this framework when discussing this topic with clients. Adapt language to the client's financial sophistication level.
On Eligibility: "Your children qualify for the Child Tax Credit — that's $2,200 per child (OBBBA). Since your tax liability is less than the full credit amount, you'll also receive the Additional Child Tax Credit as a refund."
On SSN Requirement: "I need to confirm that each child has a valid Social Security Number — not an ITIN. The credit is not available for children with ITINs."
On Documentation: "I'm required by law to complete a due diligence checklist for this credit. I'll need to verify that each child lived with you for more than half the year and meets the other qualifying child tests."
Frequently Asked Questions
$2,200 per qualifying child (OBBBA) under age 17. The refundable Additional Child Tax Credit (ACTC) is up to $1,700 per child. These amounts are per Rev. Proc. 2025-32 and reflect the OBBBA permanent extension of TCJA CTC provisions.
The CTC phases out at $400,000 for married filing jointly and $200,000 for all other filing statuses. The credit is reduced by $50 for each $1,000 (or fraction thereof) of modified AGI above the threshold.
No. The child must have a valid Social Security Number issued by the Social Security Administration before the return due date (including extensions). An Individual Taxpayer Identification Number (ITIN) does not qualify for the CTC or ACTC.
Under IRC §6695(g), paid preparers must complete Form 8867 (Paid Preparer's Due Diligence Checklist) for every return claiming the CTC/ACTC, EITC, AOTC, or Head of Household filing status. Failure to complete Form 8867 results in a $600 penalty per return (2026 amount, adjusted for inflation).
The ACTC equals 15% of earned income above $2,500, up to $1,700 per qualifying child. Families with 3+ qualifying children may use an alternative calculation. Use Schedule 8812 to calculate. The ACTC is limited to the unused portion of the CTC after reducing tax liability to zero.
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
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