Bonus Gross Up Calculator
Gross-up a bonus to ensure your employee receives the exact net amount. Handles federal supplemental rate, state/local withholding, Social Security cap, and Additional Medicare tax.
Bonus details
Specify the cash you want the employee to take home, then layer in withholding assumptions.
Social Security is capped at the wage base; Additional Medicare applies once the YTD+bonus exceeds $200,000.
Delivers $0.00 net to the employee.
View the withholding schedule for every bucket and download a CSV for documentation.
How to Use This Calculator
Begin by entering the exact net bonus you want the employee to receive. Configure the supplemental rate plus any state or local withholding that applies, then toggle the FICA settings to model Social Security and Medicare contributions.
- Enter the exact net bonus target so the solver knows what take-home pay to deliver.
- Adjust federal, state, and local withholding percentages to reflect your jurisdiction.
- Supply YTD wages and the Social Security wage base so the calculator can honor caps and Additional Medicare.
- Click Calculate to run the numerical solver and review the printed breakdown.
Methodology
The calculator iteratively solves for the gross bonus amount that, once all withholding is applied, leaves you with the requested net. FICA contributions observe the wage base cap, and the 0.9% Additional Medicare tax kicks in if the combined YTD wages plus the bonus surpass $200,000.
- Flat percentage rates are applied to the computed gross amount, while Social Security withholding stops at the wage base.
- Medicare withholding is 1.45%, plus the 0.9% surtax above the threshold.
- Effective withholding rate is the percent of the computed gross that is deducted in taxes.
Results are estimates and may differ from payroll provider quotes. Consult your payroll service or advisor to validate specifics.
Why use this gross-up tool
- Handles FICA caps and Additional Medicare correctly.
- Flat supplemental rate method aligned with IRS rules.
- Clear breakdown and effective rate for documentation.
Full original guide (expanded)
The legacy page also surfaced a few ancillary references, such as ad placements and related payroll resources that remain documented here for completeness.
Related payroll tools
- Payroll Calculator
- Overtime Calculator
- Net-to-Gross Salary
- Simple Loan Calculator
Ad placement
The original layout reserved a 300×600 placeholder for an ad unit (used for audit review). The space is noted here as a reminder of the legacy scaffolding.