Updated · Built and checked by the PlinzoTools team, formulas tested against published sources
Calculate the gross amount needed so that, after tax, an employee nets a specific target amount.
Sometimes an employer wants to guarantee an employee receives a specific net amount after taxes -- a relocation bonus of exactly $5,000 take-home, for example -- rather than a gross amount that nets an unpredictable lower figure after withholding. "Grossing up" solves this by working backward: starting from the desired net amount, it calculates the larger gross amount that, after the effective tax rate is withheld, leaves exactly that net.
Enter your desired net (take-home) amount and the effective tax rate that will be withheld (combining federal, state, and FICA as one blended percentage -- the Paycheck Calculator or Bonus Tax Calculator can help estimate this rate).
Gross Needed = Desired Net ÷ (1 − Effective Tax Rate)
This is the inverse of a normal net-pay calculation (net = gross × (1 − rate)), solved for gross instead.
Commonly used by HR and payroll departments for relocation bonuses, signing bonuses, or any one-time payment where the company wants to guarantee a specific take-home amount rather than a gross figure.
The most common mistake in a gross-up is multiplying the target net by one plus the tax rate. Suppose you want an employee to take home exactly $5,000 and the blended rate is 30%. Multiplying gives $6,500, but 30% of $6,500 is $1,950 in tax, leaving only $4,550. The correct answer divides by 0.70 and gives $7,142.86: tax of $2,142.86 leaves exactly $5,000. The gap between the two methods grows as the tax rate rises, so getting the formula right matters most on larger payments.
The result is only as good as the rate you enter. A blended rate should include every tax that will actually be withheld from that specific payment:
Add these percentages together to get one combined figure. If you are unsure, run a comparable past payment through the Bonus Tax Calculator or the Paycheck Calculator and read the total withheld as a share of gross.
This tool assumes a single flat rate applies to the whole gross amount. In practice, a large gross-up can push the payment into a higher bracket, and the extra tax that is itself grossed up may change the effective rate slightly. The employer-side payroll tax on the larger gross amount is also a real cost that is not part of the employee's take-home figure, so a budget for a gross-up should account for it separately. Grossed-up amounts are also generally treated as taxable wages, so the gross-up payment itself is taxed, which is exactly why the formula divides instead of adding.
For payroll treatment of a specific benefit, confirm with your payroll provider or a tax professional, since some reimbursements are handled under special rules.
Because tax is calculated on the gross amount, not the net amount -- if you simply added a flat percentage to the net, the resulting gross would still net less than intended after tax is withheld from it. Dividing by (1 minus rate) correctly accounts for this.
Divide your total tax withheld by your gross pay for a recent similar payment, or use the Paycheck Calculator to estimate it from your salary and filing details.
The formula divides by one minus the rate, so the rate must stay below 100%. Real blended rates for wage payments are far lower, but if you enter something extreme the gross needed becomes very large, which is a sign the rate is not realistic.
No. The employer typically also owes its own share of payroll taxes on the grossed-up wage, so the total cost to the company is higher than the gross figure shown here.
Usually not. Grossing up is meant for payments that will be taxed. A properly documented, non-taxable reimbursement does not need it, but ask your payroll provider which category applies.
Reference: Internal Revenue Service