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Free paycheck withholding adjustment calculator. Line up your paystub federal income tax withholding against a simplified full-year federal model, then read a per-pay gap and—when you add year-to-date withheld—a remaining-year catch-up hint. Explore the payroll and tax calculator hub.
Last updated: April 21, 2026
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Coarse +6% bump in modeled federal tax
Modeled federal / pay (baseline)
$390.19
Annual modeled: $10,145
Annualized gap (add to Step 4c–style)
$-19.81 / pay
Positive = model suggests more federal withholding per pay than you entered
YTD catch-up (remaining year)
Extra ~$2.08 / pay on current path
Target total federal / remaining pay ≈ $412.08 (vs modeled annual $10,145)
Projected year-end at current rate: $10,120
Federal income tax
Not FICA or state
Keeps the adjustment slice aligned with Form W-4 federal withholding conversations.
Per pay delta
Step 4c planning
Positive values point toward extra federal withholding per pay if the simplified model is close to your reality.
Mid-year read
Spread the remainder
Optional YTD federal withheld plus remaining pays estimates how much extra per pay closes the gap to the modeled annual number.
Same coarse +6%
As W-4 planner
Aligns the modeled annual tax with the other calculator when Step 2(c) is checked.
Annualization
Gross × periods
Modeled withholding per pay is the annual estimate divided by your selected pay frequency count.
What we skip
Notes & rules
Detailed mode lists Publication 15-T, credits, and non-wage income not modeled.
$4,500 biweekly gross, married, current federal withholding $320/pay, no YTD entered:
Modeled federal / pay
$387.38
Annualized gap
+$67.38
The page reuses the site’s educational Form W-4 federal income tax path with Steps 3, 4a, 4b, and 4c set to zero, plus an optional Step 2(c) multiple jobs / spouse works bump identical to the Form W-4 withholding calculator. Gross wages are annualized from your pay frequency, taxable income applies the federal standard deduction for the filing status you pick, and simplified ordinary brackets produce an estimated annual federal income tax. Dividing by pay periods yields modeled federal withholding per pay. The annualized gap is that modeled per-pay amount minus the federal income tax withholding per pay you enter. When you also enter year-to-date federal withheld and paychecks remaining in the year, the tool spreads the remaining modeled annual liability across those pays and compares to continuing at your current per-pay withholding.
Stub FIT → model annual tax ÷ pays → gap; + YTD → catch-up per remaining payModel full W-4 steps in the Form W-4 withholding calculator.
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