- Supplemental pay is any wage paid on top of an employee's regular salary or hourly wages: bonuses, commissions, overtime, severance, back pay, awards, and payouts for unused leave.
- For 2026 the IRS lets employers withhold federal income tax on supplemental wages at a flat 22%, and requires 37% on the portion above $1 million paid to one employee in a calendar year.
- That 22% is a withholding rate, not the final tax owed. It can over-withhold for lower earners and under-withhold for high earners, who reconcile it when they file.
- Supplemental wages still carry Social Security, Medicare, and FUTA, and nondiscretionary bonuses must be folded into the regular rate when you calculate overtime.
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How much of a $10,000 bonus does your employee actually keep? Less than most people expect, once federal withholding takes its share.
Supplemental pay, the bonuses, overtime, and other extras that sit on top of an employee's regular compensation, follows its own IRS withholding rules, and getting them wrong is one of the most common and costly payroll mistakes. Here is how supplemental pay works and exactly how it is taxed in 2026.
What counts as supplemental pay?
Supplemental pay is any compensation you pay an employee on top of their regular salary or hourly wages. The IRS calls it supplemental wages and includes bonuses, commissions, overtime, severance, back pay, retroactive raises, awards, taxable fringe benefits, and payouts for unused leave. It applies to W-2 employees, not 1099 contractors, who are paid and taxed under a different set of rules.
The reason the label matters is tax. Supplemental wages are ordinary taxable income, but the IRS gives employers their own way to withhold federal income tax on them, separate from the regular paycheck. (Read: how independent contractors are paid and taxed, which works very differently.) The clearest way to see the point is to line supplemental pay up against regular pay.
How is supplemental pay different from regular pay?
The differences come down to timing, entitlement, and withholding. Regular pay is the fixed, recurring amount an employee is guaranteed under their employment contract. Supplemental pay is extra, paid for a specific reason, and can be withheld at a flat rate rather than through the employee's Form W-4.
| Aspect | Regular pay | Supplemental pay |
|---|---|---|
| Pay cycle | Fixed and recurring each period | Ad hoc, tied to an event or milestone |
| Entitlement | Guaranteed under the employment contract | Often conditional or discretionary |
| Federal income tax withholding | Based on the employee's Form W-4 | Flat 22% option, or aggregated with regular wages |
| Examples | Base salary, hourly wages | Bonuses, overtime, commissions, severance |
Both show up on the same payslip, and both carry Social Security and Medicare. Those categories cover a lot of ground, so here are the specific types you will actually run into.
What are the main types of supplemental pay?
The most common types are severance, overtime, retroactive pay, bonuses and commissions, equity, unused-leave payouts, awards, back pay, and taxable moving-expense reimbursements.
Each carries its own tax or labor rule, and a few hide traps. Start with the one that shows up during layoffs.
How does severance pay work?
Severance pay is money you pay an employee on termination, usually during layoffs or restructuring, and it is not required by US federal law. Severance is set by company policy or an agreement, with no standard formula. It is fully taxable, carries income tax withholding plus Social Security and Medicare, and can reduce or delay unemployment benefits depending on the state. Severance is optional, but the next type is a legal requirement.
What counts as overtime pay?
Overtime pay is the premium nonexempt employees earn for working more than 40 hours in a workweek, at no less than 1.5 times their regular rate, under the Fair Labor Standards Act. As of 2026, employees generally qualify as exempt only above a salary of $684 per week, about $35,568 a year, with a $107,432 threshold for highly compensated employees. A 2024 rule that would have raised those figures was struck down in court, so the 2019 levels still apply. Overtime is a floor set by law; retroactive pay, by contrast, fixes a past mistake.
When do you owe retroactive pay?
You owe retroactive pay when a raise, promotion, or rate change is applied late, and you have to pay the difference for the periods already worked. For example, a raise from $50,000 to $61,000 adds $11,000 a year, about $916.67 per monthly cycle. If it took effect two cycles late, you owe roughly $1,833 in retro pay. (See how this fits the wider set of payroll components) Bonuses and commissions are more familiar, but their classification hides an overtime trap.
Are bonuses and commissions supplemental pay?
Yes. Bonuses and commissions are supplemental pay, and whether they are discretionary or nondiscretionary changes your overtime math. Discretionary bonuses (a surprise holiday or spot bonus, not promised in advance) stay out of the regular rate for overtime.
Nondiscretionary bonuses (promised for hitting targets, attendance, or production, including most sales commissions) must be folded into the regular rate, which raises the overtime you owe. Equity is another form of reward, taxed on a different timeline.
How is equity compensation taxed?
Equity compensation gives employees an ownership stake, and it is taxed based on the type of award. The usual forms are stock options, restricted stock units (RSUs), and performance shares, typically vesting over three to five years.
RSUs are generally taxed as ordinary income at vesting, while option gains can be taxed at sale, with different rules for incentive versus nonqualified options. Cash is not the only thing paid out at the end of employment. Unused leave often is too.
Do payouts for unused leave count as supplemental pay?
Yes. A payout for unused vacation or sick time is supplemental pay when an employee cashes out accrued balances, often at separation. Federal law does not require private employers to pay out unused sick leave, though many do by policy or state law. Recognition programs can also put money in an employee's pocket.
Are awards and recognition pay taxable?
Most awards and recognition pay are taxable supplemental wages. Cash awards and cash-equivalents like gift cards are almost always taxable, while certain limited employee-achievement awards may qualify for favorable treatment. (See how the IRS treats fringe benefits) When in doubt, treat award pay as taxable. Sometimes the extra pay is not a reward at all, but money an employee was already owed.
What is back pay?
Back pay is wages an employee was owed but never received, often from underpayment, unpaid overtime, minimum-wage violations, or wrongful termination.
Under the FLSA, employees can recover back pay and, in many cases, an equal amount in liquidated damages, with a two-year statute of limitations (three years for willful violations). The last type changed under recent tax law and catches many employers off guard.
Are moving-expense reimbursements taxable now?
Yes. For almost all employees, employer-paid moving-expense reimbursements are now taxable supplemental wages. The 2017 Tax Cuts and Jobs Act suspended their tax-free treatment, and the 2025 tax law (P.L. 119-21) made that repeal permanent, while extending the surviving exception beyond active-duty military to include members of the intelligence community.
If you reimburse relocation for a civilian employee, report it as wages and withhold on it. Knowing the types is half the job. The other half is withholding the right amount.
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From bonuses to overtime, we help growing companies run accurate, compliant payroll so nothing slips through. Talk to our team about taking it off your plate.
How is supplemental pay taxed in 2026?
Supplemental wages are taxed as ordinary income, and the IRS gives employers two ways to withhold federal income tax: the flat percentage method and the aggregate method.
For 2026, IRS Publication 15 keeps the flat rate at 22%, with a mandatory 37% rate on any supplemental wages above $1 million paid to one employee during the year.
Flat percentage method: If you pay supplemental wages separately from regular wages (or identify the amount separately), you can withhold at a flat 22%. One condition employers forget: this method is only allowed if you withheld income tax from the employee's regular wages in the current or prior year. The 22% rate held steady into 2026 because the 2025 tax law made the underlying individual tax rates permanent.
Aggregate method: If you combine supplemental wages with regular wages in one paycheck without identifying them separately, you withhold on the whole amount as if it were regular pay, using the employee's Form W-4.
The $1 million rule: Once an employee's supplemental wages cross $1 million in a calendar year, the excess must be withheld at 37%, and that rate cannot be avoided with the aggregate method.
On top of federal income tax, supplemental wages carry the same employer payroll taxes as regular wages.
| Tax | Rate (2026) | Notes |
|---|---|---|
| Social Security | 6.2% employee + 6.2% employer | Applies up to the $184,500 wage base for 2026 |
| Medicare | 1.45% employee + 1.45% employer | No wage cap |
| Additional Medicare | 0.9% employee | On wages above $200,000; employer withholds but does not match |
| FUTA | 6.0% employer | On the first $7,000 of wages; usually 0.6% after the state credit |
The withholding table looks simple, but choosing between the two methods is where employers most often overpay or underpay.
Flat rate or aggregate: which method withholds more?
It depends on the employee's tax bracket, because withholding is not the final tax. Take a $1,000 bonus. The flat method withholds $220 (22%).
If the employee's W-4 would otherwise drive a 24% rate, the aggregate method takes $240, so the flat method withholds less. For an employee in the 12% bracket, the flat 22% method over-withholds, and they get the difference back at filing.
This is the point most guides miss: the 22% flat rate is a withholding figure, not the tax your employee owes. High earners can end up under-withheld and face a bill; lower earners get a refund.
From what we have seen, the cleanest approach is to pick one consistent, compliant method and tell employees plainly that a bonus withheld at 22% is not the same as a 22% tax. (See exactly how payroll deductions work) A few employer duties keep the rest of the process clean.
What do employers need to get right?
Employers need to nail withholding, overtime classification, payroll taxes, and record-keeping as part of sound payroll administration. Five practices cover most of the risk.
- Pick the right withholding method: Decide between flat 22% and aggregate, apply the $1 million rule, and remember the flat method requires income tax to have been withheld from regular wages.
- Classify bonuses correctly: Nondiscretionary bonuses and commissions go into the regular rate for overtime; discretionary ones do not. This is a common audit trigger.
- Withhold FICA and pay FUTA: Supplemental wages carry Social Security, Medicare, the 0.9% Additional Medicare Tax over $200,000, and FUTA, exactly like regular wages.
- Automate the calculation: Manual math invites errors on rates and thresholds; an automated payroll system applies the right method every run.
- Keep records and communicate: Document every supplemental payment, tell employees how withholding works so a large gross bonus is not a surprise, and let your payroll software keep the audit trail.
Handle those five well and supplemental pay becomes routine rather than risky. The moment you pay people in more than one country, though, the practical steps to run payroll for a team get a lot more complex, which is where a partner helps.
How does Wisemonk help you run payroll at scale?
Wisemonk is an India-native Employer of Record that helps companies hire, pay, and stay compliant without setting up their own local entity. We handle payroll, tax withholding, statutory benefits, and worker classification end to end, which is the same machinery behind getting supplemental pay right for a distributed workforce.
Here is what that looks like in practice for two teams we work with.
"The Wisemonk team played a key role in helping us hire for specialized B2B SaaS marketing skills. We built the team within four months, hiring experienced professionals across SEO, digital marketing, product marketing, and GTM roles. They are a great partner providing integrated EOR and recruitment services, and I would recommend them to any B2B SaaS vendor." - Saurabh Sharma, CMO at OneReach.ai.
"I highly recommend Wisemonk. They helped us connect with exceptional engineers and researchers who are important contributors to our team. They were easy to work with, transparent throughout, and instrumental in helping us build a strong product team." - Krishna Ramachandran, Co-founder at Onform.
India is where we are strongest today. Employment, payroll, and compliance for your Indian hires are what we do best, and we are planning our expansion into markets such as the US and the UK.
Ready to take payroll off your plate?
We are here to make payroll and compliance simple. Let us handle withholding, statutory benefits, and every supplemental payment so you can focus on building your team.
Frequently asked questions
What is supplemental pay?
Supplemental pay is compensation paid on top of an employee's regular salary or hourly wages, such as bonuses, commissions, overtime, severance, back pay, and payouts for unused leave. The IRS calls it supplemental wages and applies specific withholding rules to it.
How is supplemental pay taxed in 2026?
In 2026, employers can withhold federal income tax on supplemental pay at a flat 22%, and must withhold 37% on any amount above $1 million paid to one employee in the year. Supplemental pay is also subject to Social Security, Medicare, and FUTA taxes.
Is the 22% supplemental rate the tax my employee actually pays?
No. The 22% is a withholding rate, not the final tax owed. Employees reconcile it when they file their return, so lower earners may get a refund and higher earners may owe more.
Are bonuses considered supplemental pay?
Yes, bonuses are supplemental pay. Whether a bonus is discretionary or nondiscretionary matters for overtime: nondiscretionary bonuses and commissions must be included in the regular rate of pay when calculating overtime, while discretionary bonuses are not.
Is severance pay required by law?
No, US federal law does not require severance pay. It is set by employer policy or an employment agreement. When paid, severance is taxable and subject to income tax withholding along with Social Security and Medicare.
Are moving-expense reimbursements taxable?
Yes. For almost all employees, employer-paid moving-expense reimbursements are taxable supplemental wages. The 2025 tax law made the repeal of tax-free treatment permanent, leaving an exception only for active-duty military and the intelligence community.
Do employers withhold state income tax on supplemental pay?
Usually, yes. Most states with an income tax have their own supplemental withholding rules, some a flat state supplemental rate and others the regular wage tables, while a few states have no income tax at all. Check the rate for each state where your employees work in addition to the federal rules.
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