Gross-up payroll calculations determine the gross pay needed to provide an employee with a specified net pay amount when the employer covers the employee’s taxes.
In a standard payroll calculation, taxes and other deductions are subtracted from gross pay to determine net pay. A gross-up calculation works in the opposite direction: it starts with the intended net pay and determines the gross pay required.
Why Is a Gross-Up Calculation Necessary?
Taxes paid by an employer on an employee’s behalf generally constitute additional wages. The taxes on those additional wages must also be considered, so simply adding an estimated tax amount to the intended net pay may not produce the correct result.
What Factors Matter for Expatriate Payroll?
Relevant factors include the employer’s compensation and tax-payment policies, salary and benefits, the states where the employee works and resides, and applicable taxes and deductions. The calculation reflects the employer’s agreed responsibilities and should be coordinated with payroll reporting and the employee’s individual income tax return.
Monthly payroll withholding does not necessarily equal the final annual tax liability determined on the individual income tax return. Additional review or reconciliation may be needed, depending on the employer’s policies and the return results.
How We Can Help
We support gross-up payroll calculations, monthly payroll processing, and payroll tax filings for expatriate employees. We confirm the scope of our services after reviewing your needs and the employer’s policies.
This answer provides general information. The treatment of a particular arrangement depends on the employer’s policies and the employee’s circumstances.
Reference: IRS Publication 15 — Employer’s Tax Guide
Information reviewed: October 13, 2026
