We promised an employee a net bonus. Is the tax we pay on top also taxable compensation?
Employer-paid employee taxes can themselves be additional taxable wages, so a net bonus usually requires a gross-up computation.
By AE Tax Advisors Team · Updated October 28, 2026
Employer-paid employee taxes can themselves be additional taxable wages, so a net bonus usually requires a gross-up computation. Employer payroll taxes are an additional cost as well. The withholding method used for payroll is not a promise that the employee's final income-tax liability will match the withheld amount.
A specific business-owner situation
An employer promises a $5,000 take-home bonus. Adding a flat estimated tax amount may still leave the employee below the promised net because the added wages also trigger withholding.
Illustrative example, not a client result.
What to establish before filing
- Define exactly which taxes the promise covers.
- Calculate the iterative or formula gross-up.
- Reconcile the payroll result and employer taxes.
Which fact changes the answer?
Wage-base limits and additional withholding requirements can change the calculation by employee. Two people promised the same net amount can cost different gross amounts.
A mistake to avoid
Do not describe supplemental wage withholding as the employee's final tax rate.
Records that support the decision
- Bonus agreement.
- Payroll calculation.
- Employee year-to-date wages.
The decision to document
Approve the total employer cost using payroll's final calculation before promising a net compensation figure.
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Related questions
- Can we give an employee a catalog selection instead of cash and treat it as a tax-free achievement award?
- Can staff at one of my companies get tax-free employee discounts from another company I own?
Sources and editorial context
- IRS Publication 15: employer tax guide
- IRS Publication 15-A: supplemental payroll rules
- IRS Publication 15-B: employee fringe benefits
General educational information prepared with AI assistance. No individual professional review is claimed. Apply the relevant tax-year rules to the actual records. Editorial policy · AI disclosure.