How to calculate bonus from salary
When a plan is written as a percentage of salary, the core math is usually simple. The part that trips people up is not the multiplication. It is deciding which salary figure is eligible, whether proration applies, whether a multiplier changes the target, and whether the result is gross or net.
Use this guide when
- The offer or plan says “X% bonus” or “Y% incentive.”
- You need to know which salary number to start from.
- You want a clean method before using the calculator.
Basic formula
That is the clean starting point. Then ask whether your plan adds any of the following: company multiplier, performance factor, proration, threshold, or cap.
Step-by-step method
Worked examples
| Eligible salary | Bonus % | Target bonus | Adjustment | Final estimate |
|---|---|---|---|---|
| $70,000 | 10% | $7,000 | None | $7,000 |
| $90,000 | 12% | $10,800 | Company factor 0.9 | $9,720 |
| $100,000 | 15% | $15,000 | 75% proration | $11,250 |
Common mistakes
FAQ
What is the basic formula for bonus from salary?
The basic formula is eligible salary multiplied by bonus percentage. Real-world plans may then add proration, company multiplier, performance factor, or cap logic.
Which salary number should I use?
Use the salary figure the plan actually references. In many cases that is base salary, but some plans use eligible earnings or target compensation.
Why does the gross result differ from the paycheck?
Because payroll withholding, taxes, benefits deductions, and employer-specific processing can change what lands in the payslip.
Official-source note for payroll questions
This guide estimates gross bonus amounts only. In U.S.-style payroll scenarios, IRS guidance on supplemental wages can affect withholding, so net pay may differ from the headline bonus amount.