W-4 Withholding Estimator
See how life changes may affect your tax withholding and take-home pay.
Your Current Paycheck
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Life Change
Current paycheck
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Estimated new paycheck
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Annual impact
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Rough directional estimate only. Your actual impact depends on total household income, credits, deductions, and how you fill out the specific W-4 form. Use the official IRS Tax Withholding Estimator for a precise calculation. The old “allowances” system (claim 0 or 1) was replaced in 2020.
How the Current W-4 Works
The W-4 (Employee’s Withholding Certificate) tells your employer how much federal tax to withhold. The 2020 redesign replaced the old “allowances” system with dollar amounts and checkboxes. Key fields include:
- Filing status — Single, Married, or Head of Household
- Multiple jobs — Adjusts if you or your spouse work multiple jobs
- Dependents — Child tax credit and dependent amounts
- Other income / deductions — Side income, extra deductions
- Extra withholding — Request additional tax be withheld
When Should You Update Your W-4?
- Getting married or divorced
- Having a baby
- Starting a second job or side gig
- Getting a significant raise
- Buying a home (mortgage interest deduction)
- Any major income change
You can change your W-4 as often as you want — there is no limit. Submit a new form to HR and changes typically take effect within 1-2 pay cycles. For a detailed look at how withholding affects your pay, try our paycheck calculator.