- Supplemental pay is any wage paid on top of regular salary or hourly wages: bonuses, commissions, overtime, severance, back pay, awards, and unused-leave payouts. The IRS calls these supplemental wages and taxes them as ordinary income.
- 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. Publication 15 confirms both rates for the year.
- That 22% is a withholding rate, not the amount of tax your employee ultimately owes. It over-withholds for employees in lower tax brackets and under-withholds for high earners, who reconcile the difference on their annual return.
- Supplemental wages still carry Social Security, Medicare, and FUTA. Nondiscretionary bonuses and commissions must also be folded into the regular rate when you calculate overtime, which is one of the most common audit triggers.
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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. Getting them wrong is one of the most common and costly payroll mistakes.
Having run payroll for 300+ global companies and more than 2,000 employees, we see the same three errors repeat: the wrong withholding method, a misclassified bonus, and no paper trail for either. Here is how supplemental pay works and 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 taxes it as ordinary income.
It covers bonuses, commissions, overtime, severance, back pay, retroactive raises, awards, taxable fringe benefits, and payouts for unused leave. These rules apply to W-2 employees, not 1099 contractors, who are paid and taxed under a different set of rules.
The label matters because of tax. The IRS gives employers a way to withhold federal income tax on supplemental wages that is separate from the regular paycheck. The clearest way to see the difference is to line the two up side by side.
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 instead.
| Aspect | Regular pay | Supplemental pay |
|---|---|---|
| Pay cycle | Fixed and recurring | Ad hoc, tied to an event |
| Entitlement | Guaranteed by contract | Often conditional or discretionary |
| Income tax withholding | Based on Form W-4 | Flat 22%, or aggregated with regular wages |
| Examples | Base salary, hourly wages | Bonuses, overtime, commissions, severance |
Both appear 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 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. US federal law does not require it, so it is set by company policy or an agreement, with no standard formula.
It is fully taxable and carries income tax withholding plus Social Security and Medicare. It can also reduce or delay unemployment benefits, depending on the state. Severance is optional; 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. Exempt or nonexempt is an employee classification decision, not a job-title one.
An employee qualifies as exempt only above a salary of $684 a week, about $35,568 a year, with a $107,432 total-compensation threshold for highly compensated employees. Both figures come from the 2019 rule.
A 2024 rule that would have raised them was vacated in court, and on 14 May 2026 the Department of Labor issued a technical amendment formally restoring the 2019 levels.
Several states, including California, New York, and Washington, set a higher salary floor that overrides the federal one. 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.
Say a raise from $50,000 to $61,000 takes effect two monthly cycles late. The $11,000 annual increase works out to about $916.67 a cycle, so you owe roughly $1,833 in retro pay on top of the new salary.
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, such as a surprise holiday or spot bonus that was not promised in advance, stay out of the regular rate.
Nondiscretionary bonuses, promised for hitting targets, attendance, or production and including most sales commissions, must be folded into the regular rate. That changes how you calculate overtime pay for every hour worked in that period.
From our experience, this single distinction creates more back-pay exposure than any other supplemental item, because the error repeats every pay period until someone catches it. 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 and nonqualified options. Cash is not the only thing paid out at the end of employment.
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 PTO, usually at separation.
Federal law does not require private employers to pay out unused leave, but several states require accrued vacation to be paid at separation, often as prorated PTO. 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 and cash equivalents such as gift cards are always taxable, no matter how small the amount, because they do not qualify as a de minimis benefit.
Certain limited employee-achievement awards given as tangible property may still qualify for favorable treatment. See how the IRS treats fringe benefits. When in doubt, treat award pay as taxable. Sometimes, though, the extra pay is 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. The statute of limitations is two years, or three for willful violations. The last type changed under recent tax law.
Are moving-expense reimbursements taxable now?
Yes. For almost all employees, employer-paid moving-expense reimbursements are 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. It also extended the surviving exception beyond active-duty military to 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 the cracks.
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 supplemental wages above $1 million paid to one employee during the year. Both rates held steady because the 2025 tax law made the underlying individual rates permanent.
Flat percentage method: If you pay supplemental wages separately from regular wages, or identify the amount separately, you can withhold at a flat 22%. The condition employers forget: this is only allowed if you withheld income tax from that employee's regular wages in the current or prior year.
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. The two are separate obligations, and it helps to know how payroll tax and income tax differ.
| Tax | Rate (2026) | Notes |
|---|---|---|
| Social Security | 6.2% employee + 6.2% employer | Up to the $184,500 wage base |
| Medicare | 1.45% employee + 1.45% employer | No wage cap |
| Additional Medicare | 0.9% employee | Above $200,000; no employer match |
| FUTA | 6.0% employer | First $7,000 of wages; 0.6% after state credit |
State rules sit on top of the federal ones. Most states with an income tax set their own supplemental rate, and employees who live in one state but work in another bring state tax reciprocity agreements into play.
The table looks simple, but choosing between the two withholding 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.
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% 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 at filing; lower earners get a refund.
We process over $20 million in monthly payroll for more than 2,000 employees, and the cleanest approach we have found is to pick one consistent, compliant method, then tell employees plainly that a bonus withheld at 22% is not the same as a 22% tax.
See exactly how payroll deductions work on a payslip. A few employer duties keep the rest of the process clean.
What do employers need to get right?
Across the payrolls we run, the risk concentrates in four places: withholding, overtime classification, payroll taxes, and record-keeping, all part of sound payroll administration. Five practices cover most of it.
- 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 every other payroll tax.
- 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 keep the audit trail your W-2 filing deadlines depend on.
Handle those five well and supplemental pay becomes routine rather than risky. The moment you pay people in more than one country, global payroll adds currencies and local statutory rules on top. Here is the step-by-step way to run payroll for a global team.
How does Wisemonk help you run payroll at scale?
Wisemonk is an India-native Employer of Record that helps global companies hire, pay, and stay compliant without setting up their own local entity.
We have helped over 300 global companies hire, pay, and manage more than 2,000 employees. Here is what we handle for a distributed workforce:
- Hiring and onboarding: Compliant employment contracts, offer letters, background verification, and structured onboarding from day one.
- Payroll: Accurate monthly payroll processing, tax withholding, payslips, and year-end filings, including bonuses and every other supplemental payment.
- Benefits administration: Statutory and supplementary benefits, insurance, and leave, so you can outsource benefits administration entirely.
- Statutory compliance: Registrations, filings, worker classification, and audit-ready records handled end to end.
- Contractor management: Compliant contracts, invoicing, and on-time contractor payroll alongside your full-time team.
Refer to our blogs for more detail on how each of these works.
Red Hill Technology Solutions has run its India engineering team on Wisemonk for the past year and a half. They handle payroll and benefits end to end, so I can offer my employees good health insurance without having to master the idiosyncrasies of Indian benefits myself. Payroll cutoff reminders arrive every month before I need them, and off-cycle bonus runs have never been a problem. Even equipment purchasing, a real headache for a US company shipping to Indian addresses, is as simple as telling them what I need. Exchange rates are fair and the pricing is transparent.
Deepika Elumalai, our point of contact, ties it all together. Whatever comes up, she pulls in the right people and sees it through. For any US company building a team in India, Wisemonk is an easy recommendation. - Tak Yamamoto, President, Red Hill Technology Solutions, Inc.
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.
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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 someone in a lower bracket may get a refund while a high earner 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 set their own supplemental withholding rules. Some use a flat state supplemental rate, others use the regular wage tables, and a few states have no income tax at all. Check the rule for every state where your employees work.
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