What gross paycheck or bonus reaches my target net after included withholding?
Solve for gross pay needed to reach a target net payment using explicit withholding assumptions, year-to-date FICA wages, and the selected deductions. The inverse engine crosses Social Security and Additional Medicare thresholds instead of dividing net pay by one flat tax rate. Federal withholding is either an entered payroll rate or an eligible supplemental method.
tax gross up calculator
Quick answer
Solve for gross pay needed to reach a target net payment using explicit withholding assumptions, year-to-date FICA wages, and the selected deductions. The inverse engine crosses Social Security and Additional Medicare thresholds instead of dividing net pay by one flat tax rate. Federal withholding is either an entered payroll rate or an eligible supplemental method.
Also answers
- net to gross paycheck calculator
- bonus gross up calculator
- gross pay from net pay
- payroll tax gross up
Good fit when
- Explicit paycheck withholding gross-ups
- Eligible supplemental bonus payments
- Threshold-crossing payroll scenarios
Have ready
- Target net payment and tax year
- Employer YTD Social Security, Medicare and supplemental wages
- Federal method and explicit state/local rates
- Income-tax-only, FICA-exempt and after-tax deductions
Result you get
Gross pay required, resulting net, each included withholding component, wage bases and cent-rounding difference.
How this calculation works
- Subtract separately entered income-tax-only, FICA-exempt and after-tax deductions from their appropriate bases.
- Apply 6.2% Social Security only to this employer's remaining selected-year wage-base room, plus 1.45% Medicare without a cap.
- Apply 0.9% Additional Medicare only to the incremental portion above the $200,000 employer threshold.
- Include selected federal, state and local withholding rates; supplemental mode crosses the mandatory 37% breakpoint.
- Use a monotonic numeric inverse and round gross up to cents to meet the target under the stated arithmetic.
Common mistakes and caveats
- 2027 indexed amounts are not yet published. Where needed, the calculator explicitly uses 2026 provisional baselines, not fabricated 2027 amounts.
- This is a withholding gross-up, not a full W-4, final annual-tax or jurisdiction payroll-table calculator.
- State/local withholding is an explicit rate applied to the selected federal income-tax base; differing state/local bases and FICA-exempt wages are blocked.
- Employer payroll taxes, unemployment/disability taxes, multiple-employer reconciliation and unentered benefits or deductions are excluded.
- The highest included marginal rates must leave positive net pay throughout the solver's supported range.
FAQ
Why is a gross-up not just net pay divided by 1 minus the tax rate?
An additional payment can cross the Social Security wage cap, the $200,000 employer Additional Medicare threshold or the $1 million supplemental-wage breakpoint. Different portions then receive different withholding. The solver evaluates the complete piecewise payment calculation repeatedly.
Does filing status change the employer Additional Medicare threshold?
No. Employer withholding begins above $200,000 of this employer's Medicare wages regardless of filing status. Return-level liability uses different thresholds for some statuses and combines relevant income; the gross-up predicts withholding rather than final annual liability.
How do I choose federal withholding for a regular paycheck?
Enter the effective rate from your payroll or W-4 withholding estimate for this payment. This tool does not implement the Publication 15-T tables and does not divide estimated annual income tax by a pay-period count. The entered rate is an explicit assumption.
What is the eligible supplemental-wage mode?
For separately identified supplemental wages when regular-wage income tax was withheld this or the previous calendar year, the supported optional method applies 22% below the annual $1 million breakpoint and 37% above it. The form blocks an unconfirmed eligible-method scenario.
Which deductions reduce Social Security and Medicare wages?
The supported traditional 401(k)-type deduction reduces income-tax wages but not FICA wages. The entered qualified Section 125 benefit deduction reduces both selected income-tax and FICA wages. After-tax deductions reduce take-home only. Other deduction treatments are not assumed.
Is the 2027 Social Security cap official, and will payroll cents match exactly?
No unpublished 2027 cap is claimed: $184,500 is labeled as a 2026 provisional baseline. Gross is rounded upward to a cent using unrounded tax components; actual payroll rounds each component and can differ by several cents.
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