Calculating a bonus depends on how it’s structured. Most bonuses fall into one of a few categories: a flat percentage of salary, a commission on sales, a share of a company-wide bonus pool, or a performance-linked payout tied to specific goals. The math ranges from a single multiplication to a multi-step formula, and taxes always take a cut before the money hits your account.
Percentage-of-Salary Bonus
This is the most common structure. Your employer sets a target bonus as a percentage of your annual salary, and the calculation is straightforward:
- Annual salary × bonus percentage = bonus amount
If you earn $100,000 per year and your target bonus is 5%, the math is $100,000 × 0.05 = $5,000. Some companies pay a fixed percentage to every employee at the same level, while others use the percentage as a starting point that gets adjusted up or down based on performance (more on that below).
For employees who started partway through the year, most companies prorate the bonus. If you worked 8 out of 12 months, you’d typically receive 8/12 of the full bonus amount. So that $5,000 bonus becomes $5,000 × (8/12) = $3,333.
Sales Commission Bonus
If your bonus is tied to revenue you brought in, the formula uses your total sales instead of your salary:
- Total sales × commission percentage = bonus amount
An employee who generated $20,000 in sales with a 5% commission rate earns $20,000 × 0.05 = $1,000. Some plans layer in tiers, where the commission rate increases after you pass certain thresholds. In a tiered plan, you might earn 3% on the first $50,000 in sales, 5% on the next $50,000, and 8% on anything beyond $100,000. You calculate each tier separately and add the results together.
Performance-Linked Bonus
Performance bonuses tie your payout to measurable goals, often called KPIs (key performance indicators). These could be individual targets like closing a certain number of deals, team targets like hitting a project deadline, or company-wide goals like reaching a revenue milestone.
The typical formula multiplies your target bonus by a performance factor:
- Target bonus × performance achievement percentage = actual bonus
If your target bonus is $10,000 and your performance review puts you at 120% of your goals, your bonus is $10,000 × 1.20 = $12,000. Hit only 80% of your goals, and the payout drops to $8,000. Many plans set a floor (often around 80% achievement) below which no bonus pays out at all, and a cap (often 150% to 250% of target) to limit the maximum payout regardless of how far you exceed expectations.
Some companies use a “squared” method for the performance multiplier, where your achievement percentage is multiplied by itself. Under this approach, hitting 110% of your goal doesn’t give you a 110% multiplier. Instead it gives you 1.10 × 1.10 = 1.21, or a 121% payout. This method amplifies the reward for high performers and steepens the penalty for underperformance.
Bonus Pool Distribution
Many companies fund a shared bonus pool based on overall financial results, then divide it among eligible employees. Here’s how that typically works in practice:
First, the company determines the total pool. This is often tied to a profitability target. A common structure adds or removes a fixed amount (say, 7 cents) from the pool for every dollar the company finishes above or below its profit goal. If the company beats its target by $1 million, $70,000 gets added to the pool.
Next, each employee’s share is calculated on a prorated basis using their individual target bonus as the weight. If the total of all employees’ target bonuses is $500,000 and your target is $10,000, you represent 2% of the pool. When the pool grows or shrinks, your bonus moves proportionally.
The full formula looks like this:
- (Your target bonus ÷ total of all target bonuses) × adjusted bonus pool = your bonus
How Taxes Reduce Your Bonus
Your bonus is considered supplemental wages by the IRS, which means your employer can withhold federal income tax using one of two methods.
The flat-rate method withholds 22% for federal income tax on bonuses up to $1 million. Bonuses above $1 million are subject to a mandatory 37% withholding on the excess. This is the method most employers use because it’s simple.
The aggregate method combines your bonus with your regular paycheck for that pay period and calculates withholding as if the combined total were your normal pay. This often results in a higher withholding amount because the lump sum temporarily pushes your income into a higher tax bracket for that single paycheck. The extra withholding usually comes back as a larger refund at tax time, but it does mean less cash in your pocket when the bonus arrives.
On top of federal income tax, your bonus is also subject to Social Security tax (6.2% up to the annual wage base), Medicare tax (1.45%, plus an additional 0.9% on high earners), and state income tax if your state has one. To estimate your actual take-home bonus:
- Bonus amount − federal withholding − Social Security − Medicare − state tax = take-home amount
On a $5,000 bonus using the 22% flat rate in a state with a 5% income tax, your deductions would be roughly $1,100 federal, $310 Social Security, $72.50 Medicare, and $250 state, leaving you about $3,267.
Bonuses and Overtime for Hourly Workers
If you’re a non-exempt hourly employee who earns a non-discretionary bonus (one that was promised in advance, such as a productivity bonus or a bonus for completing a project on time), that bonus must be factored into your overtime pay calculation under the Fair Labor Standards Act. Discretionary bonuses, like a surprise holiday gift your employer wasn’t obligated to pay, are excluded.
The Department of Labor provides a clear method. Here’s how it works using their example: an employee earns $10.00 per hour and receives a $50 non-discretionary bonus in a week where they worked 43 hours.
- Step 1: Calculate total compensation. $10.00 × 43 hours = $430, plus the $50 bonus = $480 total.
- Step 2: Find the regular rate. $480 ÷ 43 hours = $11.16 per hour.
- Step 3: Calculate the half-time overtime premium. $11.16 × 0.5 = $5.58. (The straight-time pay for those overtime hours is already included in Step 1, so you only owe the extra half-time premium.)
- Step 4: Multiply by overtime hours. $5.58 × 3 overtime hours = $16.74 in additional overtime pay.
- Step 5: Total due: $480 + $16.74 = $496.74.
Without the bonus, the employee’s overtime would have been calculated on a $10.00 regular rate. The bonus bumps the regular rate to $11.16, which increases the overtime premium. If you receive a quarterly or annual non-discretionary bonus, your employer is required to retroactively recalculate overtime for the weeks covered by that bonus period.