Free child tax credit calculator
Enter your number of qualifying children and income — this child tax credit calculator applies the 2024 $2,000-per-child credit, the phase-out above $200k/$400k, and the $1,700 refundable ACTC limit, updated live, as you type.
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Estimated only. Actual withholding depends on your W-4 elections, filing status, and local laws. Consult your payroll provider for exact figures.
Results are estimates. Consult a professional.
How the child tax credit calculator works
The child tax credit (CTC) provides up to $2,000 per qualifying child under age 17, directly reducing the federal income tax you owe. It is one of the largest tax breaks available to families. A portion — the Additional Child Tax Credit (ACTC) — is refundable, meaning you can receive up to $1,700 per child back as a refund even if you owe no tax.
The credit phases out at higher incomes. For every $1,000 (or fraction thereof) of income above the threshold, the available credit is reduced by $50. This phase-out can eliminate the credit entirely at high incomes.
Worked example: two children, partial phase-out
Morgan and Chris file jointly with 2 qualifying children under 17. Their MAGI is $425,000, which is $25,000 above the MFJ phase-out threshold of $400,000. Full CTC = $2,000 × 2 = $4,000.
Credit amount by income and number of children (2024)
The table below shows the total available child tax credit at selected income levels for 1, 2, and 3 qualifying children. Credits are shown for single/HOH and MFJ filers. The $1,700 ACTC cap per child applies for lower-income filers where the credit exceeds their tax liability.
| MAGI | 1 child (single) | 2 children (single) | 3 children (single) | 1 child (MFJ) | 2 children (MFJ) | 3 children (MFJ) |
|---|---|---|---|---|---|---|
| $100,000 | $2,000 | $4,000 | $6,000 | $2,000 | $4,000 | $6,000 |
| $200,000 | $2,000 | $4,000 | $6,000 | $2,000 | $4,000 | $6,000 |
| $210,000 | $1,500 | $3,500 | $5,500 | $2,000 | $4,000 | $6,000 |
| $300,000 | $0 | $0 | $0 | $2,000 | $4,000 | $6,000 |
| $415,000 | — | — | — | $1,500 | $3,500 | $5,500 |
| $520,000 | — | — | — | $0 | $0 | $0 |
Phase-out: $200,000 (single/HOH), $400,000 (MFJ). Reduction: $50 per $1,000 of MAGI above threshold. Source: IRS Rev. Proc. 2023-34.
Tips for maximizing the child tax credit
Several common situations affect how much of the credit you can actually use. These tips help you claim the full benefit you are entitled to.
- Confirm the SSN requirement — Each qualifying child must have a valid Social Security Number (SSN) issued before your return's due date (including extensions). An ITIN does not qualify a child for the $2,000 CTC, though it may qualify for the $500 Credit for Other Dependents.
- Verify age as of December 31 — A child who turns 17 at any point during the year does not qualify for the CTC for that year, even if they were 16 for most of it. Age is determined on December 31 of the tax year.
- ACTC can produce a refund even with no tax liability — If your CTC exceeds what you owe in tax, the refundable ACTC portion (up to $1,700 per child) can come back as a refund. You need at least $2,500 in earned income to begin qualifying for any ACTC.
- Reduce MAGI to preserve the credit — Pre-tax retirement contributions (401(k), IRA), HSA contributions, and self-employed health insurance deductions all lower MAGI. If you are near $200,000 (single) or $400,000 (MFJ), these can protect the full $2,000 per child.
- Split-custody families: check the custodial parent rule — The CTC generally goes to the custodial parent (the one the child lives with more nights). A non-custodial parent can claim the credit only if the custodial parent signs Form 8332 releasing the exemption.
Accuracy and limitations
This calculator applies the 2024 child tax credit rules: $2,000 per qualifying child, the statutory phase-out thresholds, and the $1,700 ACTC per-child cap. It computes the phase-out reduction using the $50-per-$1,000 rule and estimates the refundable ACTC using 15% of earned income above $2,500.
The calculator does not verify qualifying-child status (residency test, relationship test, age test, SSN requirement), model the interaction with the Credit for Other Dependents ($500 non-refundable credit for dependents who do not qualify for the CTC), or account for the net investment income tax. The credit is claimed on Schedule 8812 (Form 1040). This is a planning tool — not tax advice. Confirm eligibility with IRS Publication 972 or a tax professional.
Child tax credit terms defined
About this child tax credit calculator
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