A tax gross-up clause is a contract provision that requires the payer to increase a payment enough to cover the recipient’s taxes on it, so the recipient walks away with a specific after-tax amount. Because the extra money used to pay those taxes is itself taxable, the clause has to cover taxes on taxes until the arithmetic settles on a final figure. These provisions show up in executive compensation, employee relocation packages, fringe-benefit arrangements, and cross-border loan agreements, and the math tends to surprise people the first time they run it.
What the Clause Actually Does
Under federal law, nearly every transfer of value counts as gross income to the person who receives it.1Office of the Law Revision Counsel. 26 USC 61 – Gross Income Defined When a company pays an employee’s tax bill, the IRS treats that payment as more taxable income. A gross-up clause accounts for this cascade. The payer covers the original tax hit, then the tax on that tax payment, then the tax on that additional amount, until the numbers converge on a gross figure that leaves the recipient whole.
Without the clause, a recipient expecting a $50,000 relocation benefit might pocket only around $35,000 after federal, state, and payroll taxes. The clause shifts the entire tax burden to the payer and turns a net obligation into a gross payment large enough to satisfy the recipient and every taxing authority at once.
The Gross-Up Formula
The core equation is short:
Gross Payment = Net Payment ÷ (1 − Combined Tax Rate)
Start with the net amount the recipient should keep. Add every applicable tax rate: federal income tax, state income tax, Social Security, Medicare, and any local taxes. Convert the total to a decimal, subtract from 1, and divide.
Suppose you want an employee to net $10,000 and the combined rate is 30%. Divide $10,000 by (1 − 0.30): $10,000 ÷ 0.70 = $14,285.71. The $4,285.71 in taxes equals exactly 30% of $14,285.71, leaving $10,000 in the employee’s hands. The formula collapses the tax-on-tax cascade into a single step.
Costs grow quickly at higher rates. At a 45% combined rate, that same $10,000 net requires a gross payment of $18,181.82. At 50%, the gross doubles to $20,000. Large executive relocations and parachute payments can produce gross-up costs approaching or exceeding the underlying benefit, which is why these provisions get so much attention during contract negotiations.
The Rates You Need to Plug In
Every tax that touches the payment has to appear in the combined rate. Miss one and the recipient still ends up short.
Federal Income Tax
For 2026, federal income tax rates range from 10% to 37%, with the top bracket starting at $640,600 for single filers and $768,700 for married couples filing jointly.2Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 For gross-up purposes, the more practical number is often the supplemental wage withholding rate: a flat 22% on supplemental wages up to $1 million in a calendar year, and a mandatory 37% on the portion above $1 million.3Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide Bonuses, relocation reimbursements, severance, and gross-up payments themselves all count as supplemental wages.
Social Security and Medicare
The employee share of Social Security tax is 6.2% on wages up to $184,500 in 2026.4Social Security Administration. Contribution and Benefit Base Once year-to-date wages clear that cap, the 6.2% drops out of the calculation. Medicare tax is 1.45% on all wages with no ceiling.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
An additional 0.9% Medicare surtax applies to wages exceeding $200,000 for single filers or $250,000 for joint filers.5Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax If the gross-up pushes the recipient past those thresholds, the Medicare component in the formula is 2.35% rather than 1.45%. Skipping that step is a common mistake on executive-level gross-ups.
State and Local Taxes
State supplemental withholding rates run from about 1.5% to over 11%, and a handful of states impose no income tax at all. Some cities and counties add a local tax on top. These rates change often enough that they need to be verified for the year of the payment.
Contractor Gross-Ups Are More Expensive
A gross-up paid to an independent contractor costs more than the same net paid to an employee, because contractors owe both halves of Social Security and Medicare through the self-employment tax. The combined rate is 15.3%: 12.4% for Social Security up to the $184,500 wage base, plus 2.9% for Medicare on all net earnings.6Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The 0.9% Additional Medicare Tax kicks in at the same filing-status thresholds.
No one withholds from a contractor’s check, so the entire grossed-up amount is reported in Box 1 of Form 1099-NEC as nonemployee compensation.7Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC The contractor then pays estimated taxes quarterly. Because the contractor’s real liability depends on total income, deductions, and retirement contributions, gross-up clauses with contractors need to state which taxes the payer is covering; payers typically estimate using the flat supplemental and self-employment rates rather than modeling the contractor’s whole return.
Where These Clauses Appear
Employee Relocations
Since the Tax Cuts and Jobs Act took effect in 2018, employer-paid moving expenses are taxable to most employees. The narrow exception covers active-duty members of the U.S. Armed Forces moving under a permanent change-of-station order.8Internal Revenue Service. IRS: 2018 Employer Reimbursements for Employees’ 2017 Moves A moving van, temporary housing, or closing costs paid by the employer all count as income. Gross-up clauses in relocation packages keep the employee from subsidizing a move the company asked for.
Non-Cash Fringe Benefits
Benefits like personal use of a company car, a gym membership, or employer-provided housing are taxed at fair market value, meaning what the employee would have paid a third party in an open-market transaction, not what the benefit cost the employer.9Internal Revenue Service. Publication 15-B (2026), Employer’s Tax Guide to Fringe Benefits If the employer also picks up the employee’s share of Social Security and Medicare without deducting it from pay, those payments become additional wages requiring their own withholding. A gross-up clause formalizes that arrangement.
Golden Parachute Payments
Large payouts triggered by a change in corporate control can carry a 20% federal excise tax on the executive on top of ordinary income tax.10Office of the Law Revision Counsel. 26 USC 4999 – Golden Parachute Payments Some employment agreements gross up that excise tax, though the practice has thinned as shareholders resist the cost.
Cross-Border Interest Payments
International loan agreements routinely gross up withholding tax on interest. When a borrower in one country pays interest to a lender in another, local law may require the borrower to withhold a percentage and remit it to the tax authority. A gross-up clause requires the borrower to pay enough extra so the lender receives the full contractual rate regardless of withholding, shifting the risk of changing treaties or local rates to the borrower.
A Note on Commercial Leases
“Gross-up” is also a term of art in commercial real estate, but it isn’t a tax mechanism. When a multi-tenant building is partially vacant, the landlord adjusts variable operating costs to reflect what they would be at higher occupancy so existing tenants don’t overpay their share. Same label and same underlying logic (adjust the number so the intended allocation holds), different subject matter.
Section 280G Makes Parachute Gross-Ups Especially Costly
Grossing up a golden parachute payment is among the most expensive commitments a company can make, and it carries a hidden cost. The 20% excise tax lands on the executive, and separately, the company loses its deduction for every dollar of the excess parachute payment.11Office of the Law Revision Counsel. 26 USC 280G – Golden Parachute Payments When the company then grosses up the excise tax, the gross-up itself is additional compensation that may also be nondeductible. On a $5 million excess parachute payment, a full gross-up can cost the company several million dollars beyond the payment itself.
Section 409A Sets a Hard Deadline
Gross-up payments tied to deferred compensation must comply with Section 409A, and the penalties for missing the timing rules fall on the recipient. A violation triggers a 20% additional tax on the recipient plus interest at the federal underpayment rate plus one percentage point, calculated back to the year the compensation was first deferred.12Office of the Law Revision Counsel. 26 USC 409A – Inclusion in Gross Income of Deferred Compensation Under Nonqualified Deferred Compensation Plans
The gross-up payment has to be made by the end of the recipient’s tax year following the year in which the recipient pays the underlying taxes.13eCFR. 26 CFR 1.409A-3 – Permissible Payments If an executive pays taxes on an April 2026 return, the company has until December 31, 2027, to deliver the gross-up. Missing the deadline creates a substantial tax penalty for the person the clause was meant to protect.
Paying and Reporting the Gross-Up
For employees, the grossed-up amount runs through payroll. The full gross figure appears as taxable wages on the W-2, the employer withholds federal income tax, Social Security, Medicare, and any state or local tax, and the employee’s paycheck reflects only the intended net. Most payroll systems automate the division once someone enters the target net and the applicable rates.
Withheld taxes are reported on Form 941, the quarterly federal tax return.14Internal Revenue Service. About Form 941 For independent contractors, the full grossed-up amount goes in Box 1 of Form 1099-NEC with no withholding, and the contractor handles estimated payments.7Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC
Pay stubs should break out the grossed-up amount, each tax withheld, and the resulting net. Auditors look for a clean trail connecting the contract clause to the calculation to the payment, and the IRS requires employers to keep employment tax records for at least four years after the tax is due or paid, whichever is later.15Internal Revenue Service. How Long Should I Keep Records
Penalties If the Calculation Is Wrong
When an employer under-withholds because the gross-up was computed incorrectly, the IRS imposes a failure-to-deposit penalty that escalates with time:16Internal Revenue Service. Failure to Deposit Penalty
- 1 to 5 days late: 2% of the unpaid deposit
- 6 to 15 days late: 5% of the unpaid deposit
- More than 15 days late: 10% of the unpaid deposit
- More than 10 days after a first IRS notice: 15% of the unpaid deposit
Interest accrues on top of the penalty until the balance is paid. On a large executive gross-up where the shortfall runs into six figures, those percentages add up quickly. The contract itself may also require the employer to make the recipient whole for the shortfall, which triggers a second round of gross-up math on the corrective payment. Getting the rates and thresholds right the first time is cheaper than fixing them later.