Designing a bonus scheme in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
Bonuses are entirely discretionary under federal law unless a written agreement or established policy makes them contractually binding — how you design and document a scheme determines both your legal exposure and how motivating the incentive actually is.
Decide what behavior the bonus should drive
Before you set a number, define what you are paying for. The most common structures are:
- Performance-based bonuses tied to individual targets (sales quota, project delivery, customer satisfaction scores)
- Profit-sharing or company-wide bonuses paid when the business hits a revenue or margin threshold
- Retention or signing bonuses designed to attract or keep specific employees
- Spot bonuses awarded at a manager's discretion for exceptional one-off contributions
Each type sends a different signal. A profit-sharing pool builds collective accountability; individual performance bonuses reward personal output. Many companies layer both, but complexity has a cost — employees stop trusting a scheme they cannot model themselves.
Discretionary vs. non-discretionary: the legal distinction that matters
The Fair Labor Standards Act draws a sharp line here, and it affects overtime calculations.
A discretionary bonus is one where you retain full control over whether to pay it and how much to pay. Because you make both decisions at or near the time of payment, it is excluded from the regular rate of pay used to calculate overtime for non-exempt employees.
A non-discretionary bonus is one that employees expect based on a formula, a policy document, or consistent prior practice — even if nothing was signed. Once a bonus is non-discretionary, its value must be factored into the regular rate of pay before calculating any overtime owed during the period it covers. Getting this wrong is a common source of wage-and-hour liability.
A practical rule: if your bonus plan document tells employees "you will earn X if Y happens," it is almost certainly non-discretionary regardless of what you call it.
Tax treatment for employers and employees
Bonuses are taxable compensation. For employees, the IRS treats them as supplemental wages. Employers can withhold federal income tax using either a flat supplemental rate or the aggregate method (adding the bonus to regular wages and withholding at the employee's marginal rate). FICA applies in full: Social Security at 6.2% on wages up to the annual wage base, Medicare at 1.45% with no cap, and the 0.9% Additional Medicare Tax on high earners above the relevant threshold. Employers match Social Security and Medicare.
State tax treatment varies. Texas, Florida, Washington and a handful of other states levy no state income tax. If you operate in California, New York or other high-tax states, budget for withholding at the applicable state rate on top of federal obligations.
Bonuses are generally deductible as ordinary business expenses in the tax year they are paid (for cash-basis employers) or, for accrual-basis employers, when the liability is fixed and determinable and payment is made within 2.5 months of the tax year-end.
Plan design: terms to put in writing
Even if your bonus is discretionary, a written plan reduces disputes. At minimum, address:
- Eligibility — who qualifies (full-time only, tenure threshold, active employment on payment date)
- Measurement period — calendar year, fiscal year, quarterly
- Metrics and targets — specific, measurable criteria; avoid vague language like "at management's satisfaction"
- Payment timing — when bonuses will be paid after the period closes
- Proration rules — how mid-year hires or departures are handled
- Clawback provisions — whether bonuses must be repaid if an employee leaves within a set period or if figures are later restated
The active-employment-on-payment-date clause is particularly important. Several states scrutinize policies that forfeit earned but unpaid bonuses when an employee resigns or is terminated. Courts in Massachusetts and California, for example, have found that a bonus tied to specific performance metrics can constitute earned wages that cannot simply be withheld because the employee left before a payment date. Review your plan with employment counsel in each state where you have employees.
Avoiding common mistakes
Inconsistent application. If you pay spot bonuses more frequently to one demographic group, you create disparate-impact risk. Document your criteria and decisions.
Promising before you write. Verbal commitments — "we take care of people at year-end" — can create implied contractual obligations. Stay general until the plan document is final.
Ignoring state wage payment laws. Some states require bonuses to be paid within a specific timeframe once earned. Late payment can trigger penalties.
Benchmarking in isolation. A well-designed scheme at the wrong total compensation level will not retain people. Use salary survey data to confirm your base-plus-target-bonus package is competitive for your market and role.
If you are managing employees across multiple states or countries, payroll complexity compounds quickly — the way Mellow runs payroll across six countries on one platform can reduce the administrative overhead of multi-jurisdiction bonus payments.
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