What happens if I owe more than $1,000 when I file?

You may owe an IRS underpayment penalty, unless you qualify for a safe-harbor exception.

Why did my Child Tax Credit show as reduced?

It phases out once your income passes $200,000 (single/HoH) or $400,000 (MFJ) — reduced by $50 per $1,000 over that threshold.

Is this the same as filling out my actual W-4 form?

No — this estimates tax liability vs. expected withholding, but doesn't walk through the W-4 form's own worksheets. Use the IRS's own Tax Withholding Estimator for that.

Does this include Social Security and Medicare withholding?

No — this covers federal income tax only.

What's the difference between the Child Tax Credit and the Credit for Other Dependents?

The CTC ($2,200 for 2026) applies to qualifying children under 17 with a Social Security number; the ODC ($500, nonrefundable) applies to other dependents.

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Finance

W-4 Withholding Calculator

Check whether your expected withholding will leave you a refund or a bill at tax time.

🔒 Runs entirely in your browser — nothing here is ever uploaded

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Last reviewed 2026-08-30

About the W-4 Withholding Calculator

Estimates your full-year federal income tax liability under 2026 brackets and compares it against the federal withholding you expect from your pay stubs, to flag whether you're on track for a refund or likely to owe when you file.

100% Free Runs in Your Browser No Sign-Up Required

How to use it

Select your filing status.
Enter your annual gross wages and any other taxable income.
Enter any deductions beyond the standard deduction — leave at 0 if you'll take the standard deduction.
Enter your expected federal withholding for the year.
Enter the number of qualifying children under 17 and other dependents.
Read your estimated refund or amount owed.

Formula

Taxable income = gross wages + other income − standard deduction (2026: $16,100 single/MFS, $32,200 MFJ, $24,150 HoH) − extra deductions. Tax before credits = 2026 federal bracket schedule for your filing status. Child Tax Credit + Credit for Other Dependents = ($2,200 × qualifying children) + ($500 × other dependents), reduced by $50 per $1,000 over $200,000 (single/HoH) or $400,000 (MFJ). Estimated tax liability = tax before credits − total credit (floored at $0). Estimated refund/owed = expected withholding − estimated tax liability.

Worked example

A single filer with $75,000 in gross wages, no other income, no extra deductions, no dependents, and $8,500 in expected federal withholding: taxable income of $58,900 produces about $7,670 in tax before credits, for an estimated $830 refund.

2026 standard deduction and CTC/ODC phase-out threshold by filing status

2026 standard deduction and CTC/ODC phase-out threshold by filing status
Filing status	Standard deduction	CTC/ODC phase-out starts at
Single / married filing separately	$16,100	$200,000
Married filing jointly	$32,200	$400,000
Head of household	$24,150	$200,000

Interpreting your result

This estimates income tax liability and reconciles it against expected withholding — it does not walk through the IRS Form W-4's own worksheet lines the way the IRS's own Tax Withholding Estimator does. It doesn't include FICA, state/local income tax, self-employment income, or other credits. A large refund means you had more withheld than necessary all year — an interest-free loan to the government, not a bonus. Not tax advice.

Recommendations

• If this tool shows you're on track to owe more than $1,000, consider asking your employer to withhold an additional flat amount per paycheck (Form W-4, Step 4c).
• A consistently large refund year after year means you could increase your paycheck take-home right now by adjusting your W-4.
• The Child Tax Credit and Credit for Other Dependents phase out together — near the $200,000/$400,000 threshold, a raise or bonus can meaningfully reduce both credits at once.

Frequently asked questions

Not really — it means you had more withheld from your paychecks than you actually owed, effectively giving the government an interest-free loan.