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Most paycheck math runs one direction — start with a gross amount and work out what's left after taxes. But sometimes a company needs to run that logic backward: it has promised an employee a specific NET (take-home) amount — a $5,000 relocation payment, say, or a guaranteed $10,000 signing bonus — and needs to figure out what GROSS amount to actually pay so that, after tax withholding, the employee receives exactly that promised net figure. Simply issuing the promised number as the gross amount would shortchange the employee once taxes are withheld. "Grossing up" a payment is the standard term for this reverse calculation, and it comes up most often for one-time payments where a company wants to guarantee the employee's actual take-home amount rather than the pre-tax figure — signing bonuses, relocation assistance, and certain fringe benefits are the most common cases.
How it works
Enter the desired net pay and the applicable tax rate. The tool computes gross pay as desired net pay divided by (1 minus the tax rate) — this is the correct reverse of the standard net-pay formula (net = gross × (1 − tax rate)), solved algebraically for gross. Dividing by (1 − rate) rather than simply adding the tax rate back to the net figure is what makes the gross-up mathematically exact: after the resulting gross amount is taxed at the given rate, the leftover net amount matches the original target exactly.
- Enter desired net (take-home) pay.
- Enter tax rate (%).
- Click Calculate to see your results.
Examples
A guaranteed net bonus
To deliver exactly $5,000 net at a 22% tax rate, the required gross bonus is $5,000 ÷ (1 − 0.22) = $5,000 ÷ 0.78 = $6,410.26 — withholding 22% of that gross amount ($1,410.26) leaves exactly $5,000 net.
A relocation payment at a higher combined rate
To deliver $8,000 net at a combined 32% tax rate (federal supplemental plus state), the required gross payment is $8,000 ÷ 0.68 ≈ $11,764.71.
A smaller net amount at a lower rate
To deliver $1,500 net at a 15% tax rate, the required gross amount is $1,500 ÷ 0.85 ≈ $1,764.71.
Who should use it
- Calculating a signing bonus that nets a specific take-home amount.
- Grossing up a relocation payment or other one-time benefit.
- Budgeting the true cost to the employer of a promised net payment.
Industry applications
- Payroll and HR
- Compensation and benefits
Advantages
- Solves the reverse gross-up problem directly and correctly.
- Shows the exact tax amount withheld alongside the gross figure.
- Works for any tax rate and target net amount.
Limitations
- Single flat-rate model — real payroll may use bracket-based or flat supplemental rates depending on payment type.
Common mistakes to avoid
- Simply adding the tax percentage to the net amount (net × 1.22) instead of dividing by (1 − rate) — these give different, incorrect results.
- Using your regular marginal income tax rate instead of the flat supplemental rate that often applies specifically to bonus payments.
- Forgetting to include applicable state supplemental withholding alongside the federal rate when grossing up.
Best practices
- Confirm which tax rate actually applies to the specific payment type (bonus flat rate vs. regular payroll withholding) before grossing up.
- Combine federal and state supplemental rates into a single combined rate before running the calculation, since both usually apply together.
- Document the gross-up calculation clearly for payroll and accounting records, since a grossed-up payment often needs special handling at tax time.
Tips
- For flat-rate US bonus taxation, the federal supplemental rate is commonly 22% — check current IRS guidance for the exact applicable rate.
- Add your state's supplemental withholding rate to the federal rate for a more accurate combined gross-up.