Payroll Gross-Up Formulas: Paying Net Bonuses & Executive Stipends
A payroll gross-up is an accounting calculation used by employers to increase the gross payment amount of a bonus, relocation allowance, or executive stipend so that the employee takes home the exact desired net amount after all mandatory federal, state, and FICA payroll taxes are withheld.
The Universal Gross-Up Equation
Gross Payment = Desired Net Amount ÷ [1 - (Federal Rate + State Rate + FICA Rate + Local Rate)]
*Note: For standard supplemental wage bonuses in the US, the IRS requires a statutory federal supplemental withholding rate of 22% (or 37% for bonus amounts exceeding $1 million).
Step-by-Step Gross-Up Example
Goal: Award an employee a clean $5,000 net holiday bonus in Georgia.
- Federal Supplemental Tax: 22.0%
- FICA (Social Security 6.2% + Medicare 1.45%): 7.65%
- Georgia State Income Tax: 5.39%
- Total Combined Tax Percentage: 22% + 7.65% + 5.39% = 35.04% (0.3504)
Gross Pay Required = $5,000 ÷ (1 - 0.3504) = $5,000 ÷ 0.6496 = $7,697.04




