A gross-up offset on your paycheck is a bookkeeping deduction that cancels out extra gross wages your employer added to cover the taxes on a specific payment. You’ll usually see it paired with an inflated earnings line: the earnings go up by the tax cost, the offset removes the same amount, and your net deposit lands exactly at the figure your employer promised. No money is being taken from you. Your employer is covering your tax bill on that payment, and the offset is how payroll balances the entry.
What the Paired Entries Actually Do
When your employer promises a specific after-tax amount, they can’t just pay that number. Every dollar of compensation triggers federal income tax, Social Security, Medicare, and often state or local taxes. Paying the target amount straight would shrink your check below what was promised.
So payroll works backward. They calculate how much extra gross pay is needed so that, after withholding, the net matches the promise. That extra amount gets added to your gross wages, and an offset deduction of the same size gets pulled back out. Taxes are calculated on the inflated gross. The offset removes the non-cash portion. What’s left is the promised amount, deposited to your account.
Here’s what that looks like on a stub. Say your employer promises $1,000 after taxes. Payroll calculates that $1,300 in gross wages will produce $1,000 net. Your stub shows $1,300 in gross pay and a $300 gross-up offset deduction. Taxes come off the $1,300. You deposit $1,000. Your employer effectively spent $1,300 to put $1,000 in your hands, and the IRS treats the employer-paid tax portion as additional taxable wages you have to report.1Internal Revenue Service. Publication 525 (2025), Taxable and Nontaxable Income
Why Your Employer Grossed Up the Payment
Bonuses are the most common trigger. When leadership announces a “$10,000 bonus,” they usually mean $10,000 hitting your account, not $10,000 minus withholding. Grossing up the bonus makes the promise real.
Relocation packages are the second big one. Employer-paid moving reimbursements are generally taxable income for non-military employees.2Internal Revenue Service. Moving Expenses To and From the United States If a company offers $8,000 to help you move, grossing it up means you actually have $8,000 available rather than losing part of it to withholding.
Taxable fringe benefits round out the list. Personal use of a company car, certain awards and prizes, and gift cards all count as taxable compensation, and employers sometimes gross up their value so you’re not paying tax out of pocket on something you didn’t receive as cash. The value of these benefits shows up in Box 1 of your W-2.3Internal Revenue Service. Publication 15-B (2026), Employers Tax Guide to Fringe Benefits
How the Gross-Up Amount Is Calculated
The math is trickier than a flat tax add-on because the extra income needed to cover taxes generates its own tax liability. Payroll systems handle this with a reverse formula:
Gross Amount = Net Amount ÷ (1 – Combined Tax Rate)
The combined tax rate stacks every withholding that applies: federal income tax, Social Security at 6.2%, Medicare at 1.45%, and any state or local income tax.4Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates The employee share of Social Security and Medicare together comes to 7.65% at minimum.
For the federal income tax piece, most employers use the flat 22% supplemental wage rate for bonuses and one-time payments. The IRS allows this rate for supplemental wages up to $1 million per employee per calendar year; anything above that must be withheld at 37%.5Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide
A worked example. Your employer wants you to receive a $5,000 net bonus. Payroll uses a combined rate of 35% (22% federal supplemental, 5.35% state, 7.65% FICA):
$5,000 ÷ (1 – 0.35) = $5,000 ÷ 0.65 = $7,692.31
Your stub shows $7,692.31 in gross wages, roughly $2,692 in tax withholdings, and a gross-up offset of $2,692.31. You deposit $5,000.
Why Your Offset Might Look Different From a Coworker’s
Two wage thresholds change the math partway through the year. The 6.2% Social Security tax only applies to earnings up to an annual cap, which is $184,500 for 2026.6Social Security Administration. 2026 Cost-of-Living Adjustment (COLA) Fact Sheet Once your year-to-date wages pass that line, the 6.2% drops out of the formula and the gross-up shrinks. Going the other direction, an extra 0.9% Medicare tax kicks in once your wages pass $200,000 in a calendar year, which pushes the FICA piece of the formula from 7.65% to 8.55%.7Internal Revenue Service. Questions and Answers for the Additional Medicare Tax Payroll software usually handles both automatically.
What This Means on Your Tax Return
The full grossed-up amount is real taxable income. It shows up in your W-2 wages and flows into your adjusted gross income, even though you never saw the extra cash. For a modest bonus, the AGI bump is too small to matter. For a large relocation package or executive bonus, it can push you past phase-out thresholds for credits and deductions you’d otherwise qualify for, including the Child Tax Credit, education credits, and Roth IRA contribution eligibility.8Internal Revenue Service. Definition of Adjusted Gross Income The gross-up covers your withholding on the payment itself. It doesn’t shield the rest of your return from AGI effects.
There’s a subtler risk worth flagging. When payroll uses the flat 22% supplemental rate but your actual marginal federal rate is 24% or higher, the withholding on the grossed-up payment won’t fully cover your tax liability. You won’t notice until you file and find you owe. This shows up most for dual-income households and for grossed-up payments made late in the year, after your income has climbed. If you receive a large grossed-up payment, checking your withholding afterward is worth a few minutes.9Internal Revenue Service. Tax Withholding for Individuals
A Note for Hourly Employees
If you’re non-exempt, a grossed-up bonus can create an overtime issue that payroll sometimes misses. Under the Fair Labor Standards Act, nondiscretionary bonuses have to be folded into your regular rate of pay for overtime purposes, and the full grossed-up figure counts, not just the net.10U.S. Department of Labor. Fact Sheet 56C: Bonuses Under the Fair Labor Standards Act (FLSA) The bonus gets spread back over the workweeks during which it was earned, raising the regular hourly rate for each of those weeks.11eCFR. 29 CFR 778.209 – Method of Inclusion of Bonus in Regular Rate For any of those weeks in which you worked overtime, you’re owed a half-time premium on the bonus portion. Salaried-exempt employees don’t need to worry about this. Hourly employees who received a grossed-up production bonus or attendance award should confirm their overtime was recalculated.
How to Check Whether Your Offset Looks Right
Start with the deposit. Does the net amount match what your employer told you the payment would be? If yes, the gross-up did its job.
If the net looks short or long, compare the gross-up amount to the net target. Divide one by the other. That ratio should roughly reflect your combined tax rate: something in the neighborhood of 30–40% is typical for a bonus grossed up at the flat supplemental rate plus FICA and a moderate state tax. A gross-up that’s far smaller may mean your Social Security tax has already capped out for the year. A gross-up that seems way off in either direction is worth raising with payroll.
Common errors include using a combined rate that ignores state taxes, missing the Social Security wage cap, or plugging in the wrong federal rate for someone whose year-to-date income has moved. If the gross-up came in too low, your net pay falls short. Too high, and your W-2 overstates your income and you’ve been over-withheld. Either way, corrections get messier once the calendar year closes and tax forms are filed, so it’s worth flagging early.