You approve a $5,000 year-end bonus, but the employee's paycheck is not $3,900—and the difference is not simply “the bonus tax.” The amount withheld depends on how you identify the payment, the employee's regular-wage withholding history, and which payroll taxes apply. A commission, overtime payment, prize, or taxable fringe benefit can create the same problem.
For 2026, the federal flat withholding rate for most separately identified supplemental wages is 22%. That number is useful, but it is also easy to misuse. It is a payroll withholding method, not a promise that the employee's final federal income-tax bill will be 22%. The payment generally remains subject to Social Security, Medicare, and FUTA taxes, and it must fit into your deposit, quarterly reporting, year-end W-2, and bookkeeping processes.
This guide explains how small employers can classify, calculate, record, and reconcile supplemental wages under the 2026 federal rules. State income tax, wage-and-hour, and payroll requirements may differ, so treat the federal workflow as a starting point and confirm local rules with your payroll professional.
What counts as supplemental wages?
Supplemental wages are payments to an employee that are not regular wages. The category is broader than a discretionary holiday bonus. It can include:
- Bonuses and awards
- Sales commissions
- Overtime pay
- Reported tips
- Severance and accumulated sick-leave payments
- Prizes and back pay
- Retroactive pay increases
- Taxable fringe benefits
- Expense reimbursements under a nonaccountable plan
The classification describes the payment, not whether it is taxable. Most supplemental wages are taxable wages for federal income-tax withholding, Social Security, Medicare, and FUTA purposes. A payment that is labeled “gift,” “incentive,” or “reimbursement” does not escape payroll treatment if it is compensation for services or fails an applicable exclusion.
There is one important choice: employers may treat overtime pay and tips as regular wages instead of supplemental wages for federal withholding. That choice affects the withholding calculation, but it does not turn overtime into non-wages or remove the need to calculate the underlying overtime correctly.
Withholding is not the final tax bill
Payroll withholding is an estimate credited to the employee during the year. The employee's final tax depends on the complete tax return, filing status, other income, deductions, credits, and payments. A 22% withholding line can therefore produce either a refund or a balance due later.
The employer's job is to apply the correct payroll method to the payment date and the valid Form W-4 on file. Do not change the federal withholding percentage because an employee says the bonus will push them into a different tax bracket. If the employee wants more withholding, they should submit a new Form W-4 with additional withholding instructions.
The 2026 federal withholding methods
The method depends first on whether the supplemental payment is separately identified from regular wages.
When the payment is combined and not identified
If you pay regular wages and supplemental wages together but do not specify how much is regular and how much is supplemental, calculate federal income-tax withholding as if the entire amount were one regular payroll-period payment.
For example, a salesperson receives $3,000 of regular wages and a $1,200 commission in the same paycheck. If the payroll record presents only $4,200 of wages with no separate identification, use the regular wage withholding procedure for the total $4,200. You cannot retroactively apply the 22% method merely because part of the payment was a commission.
This can be a reasonable operational choice, but the payroll register should still retain the commission amount for compensation analysis, overtime calculations where relevant, and management reporting.
When the payment is separately identified
If the supplemental wages are paid separately—or are included in one payment but the regular and supplemental portions are specified—you have more options for an employee who received federal income-tax withholding from regular wages in the current or immediately preceding calendar year:
- Withhold 22% from the separately identified supplemental wages.
- Use the aggregate method, which adds the supplemental wages to regular wages and calculates withholding as if they were one payment, then subtracts the amount already withheld from the regular wages.
The 22% method is a flat federal income-tax withholding rate. There is no employer-selected alternative percentage for this method. The aggregate method can produce a different result because it uses the employee's Form W-4 information and the regular payroll-period tables.
If you did not withhold federal income tax from the employee's regular wages in the current or immediately preceding calendar year, you generally cannot use the 22% option for the separately identified payment. Use the aggregate method described in the employer guidance instead.
The $1 million threshold
Special treatment applies when an employee's supplemental wages from you exceed $1 million during the calendar year. The excess is subject to mandatory 37% federal income-tax withholding, without regard to the employee's Form W-4. When businesses are under common control, aggregate the relevant payments across those businesses when determining the threshold.
A small employer may not expect to encounter this rule, but a company with multiple related entities, a highly commissioned salesperson, or a large transaction-based award should make the cumulative review explicit. Do not let separate payroll accounts hide the year-to-date total.
Social Security, Medicare, and FUTA still matter
The 22% figure applies only to the optional federal income-tax withholding method for eligible supplemental wages. Regardless of which federal income-tax method you use, supplemental wages are generally subject to the employment taxes that apply to regular wages.
For 2026:
- Social Security tax is 6.2% for the employee and 6.2% for the employer, up to the $184,500 wage base.
- Medicare tax is 1.45% for the employee and 1.45% for the employer, with no wage base limit.
- Additional Medicare Tax is an extra 0.9% withheld from an employee's wages after that employee's wages exceed $200,000 for the year. There is no employer match for this additional tax.
- FUTA is an employer tax, not an employee withholding. Apply the federal unemployment rules and credit limitations to the employee's wages and your state unemployment-tax status.
Consider a separately paid $5,000 bonus for an employee who is below the Social Security wage base and has not crossed the Additional Medicare Tax threshold. Before state tax and voluntary deductions, the employee-side federal income-tax withholding would be $1,100, Social Security would be $310, and Medicare would be $72.50. The net payment would be $3,517.50. The employer would also owe $310 of Social Security and $72.50 of Medicare, plus any applicable FUTA and state payroll taxes.
That example is a cash and payroll calculation, not a determination of the employee's final tax liability. It also illustrates why a “$5,000 bonus” costs the employer more than $5,000 even though the employee receives less than $5,000.
Overtime has two separate questions in 2026
Overtime often gets mixed into the supplemental-wage discussion, but you need to answer two different questions:
- What amount of overtime must you pay? This is a wage-and-hour question. Under the Fair Labor Standards Act, covered nonexempt employees generally receive at least one-and-one-half times their regular rate for hours over 40 in a workweek. Nondiscretionary bonuses and commissions can affect the regular rate, so a bonus that was paid after the original overtime check may require a second overtime calculation.
- How should you withhold federal income tax? For this purpose, you may generally treat overtime as supplemental wages or as regular wages. If you treat it as separately identified supplemental wages and the employee meets the regular-wage withholding condition, the 22% method may be available.
In 2026, also track qualified overtime compensation separately. The new federal deduction is limited to the portion of overtime required under the FLSA that exceeds the employee's regular rate—the “half” portion of time-and-a-half overtime—not automatically every dollar paid for extra hours. The employer still generally withholds Social Security and Medicare on overtime.
The 2026 Form W-2 instructions provide box 12, code TT, for the total amount of qualified overtime compensation. A payroll system that records only one undifferentiated “overtime” total may not have enough information at year-end. Store regular hours, overtime hours, regular rate, premium portion, bonus or commission adjustments, and the amount that qualifies under the federal rule as separate fields or supporting records.
A practical payroll workflow for a bonus or commission
Use the same repeatable process for one-time and recurring supplemental payments.
1. Identify the payment before payroll closes
Write down what the payment represents, who earned it, the service period, the payment date, and whether it is being paid with regular wages. Identify bonuses, commissions, overtime, taxable reimbursements, and fringe benefits separately even when your payroll provider later combines them for a tax calculation.
2. Check the employee's current payroll record
Confirm that a valid Form W-4 is on file. Check whether federal income tax was withheld from regular wages in the current or immediately preceding calendar year. Review year-to-date supplemental wages, including payments from commonly controlled entities when applicable, and check whether the Social Security wage base or $200,000 Additional Medicare threshold has been crossed.
3. Choose and document the withholding method
For a separately identified payment, document whether you used the 22% flat method or the aggregate method and why the employee qualified for that method. If you combine the payment with regular wages, show the components in the payroll detail. Do not leave the method as an unexplained payroll-provider default; a clear note makes a later reconciliation much easier.
4. Calculate employer-side taxes and deposit timing
Compute employee and employer FICA, FUTA where applicable, and state taxes. Then check your federal deposit schedule. The IRS determines whether you are a monthly or semiweekly schedule depositor primarily from the lookback period, not from how often you run payroll. A large bonus can also trigger the $100,000 next-day deposit rule.
Federal tax deposits must be made electronically. Keep the payment confirmation with the payroll register and liability ledger. Form 941 reports the federal income tax withheld and the employee and employer shares of Social Security and Medicare; the deposit and return are separate control points.
5. Reconcile the payment into your books
A simple accounting entry for the $5,000 example might look like this:
Debit Bonus and supplemental wages expense $5,000.00
Debit Employer Social Security expense $310.00
Debit Employer Medicare expense $72.50
Credit Federal income tax withheld payable $1,100.00
Credit Employee Social Security payable $310.00
Credit Employee Medicare payable $72.50
Credit Payroll clearing / net wages payable $3,517.50
Credit Employer Social Security payable $310.00
Credit Employer Medicare payable $72.50Add FUTA, state taxes, retirement contributions, and other deductions when they apply. The exact account names are less important than keeping gross compensation, employee withholdings, employer taxes, and net cash distinct. In a plain-text ledger, tag the entry with the employee or payroll batch, payment date, compensation type, and source payroll report. That makes it possible to trace the bank withdrawal to the payroll register, tax deposit, Form 941, and eventual Form W-2.
Common mistakes to prevent
Treating 22% as a final tax rate
The flat rate is withholding. Do not tell employees that the bonus is “taxed at 22%,” and do not reduce or increase the rate based on a guess about their tax bracket.
Applying 22% when the payment is not eligible
Separately identifying a bonus is not enough. If you did not withhold federal income tax from regular wages in the current or preceding calendar year, use the required aggregate approach. Also switch to the mandatory 37% rule for the portion above the $1 million supplemental-wage threshold.
Forgetting FICA because income-tax withholding was handled
Federal income-tax withholding and employment-tax withholding are separate calculations. A payroll register that shows $1,100 of federal income tax does not prove that Social Security, Medicare, FUTA, and state taxes were handled.
Calling an employee commission a contractor payment
The label on the payment does not change worker classification. If the recipient is your employee, compensation for the employee's services belongs in payroll. Review classification separately before deciding how to report a payment.
Ignoring the second overtime calculation
A nondiscretionary production or sales bonus may increase the regular rate used to calculate overtime. Revisit the affected workweeks before finalizing the bonus payroll, rather than discovering the adjustment during a wage audit or year-end review.
Losing the trail between payroll and accounting
An unexplained lump-sum bank withdrawal is difficult to reconcile months later. Retain the approval, calculation, payroll register, W-4 basis, deposit confirmation, Form 941 support, and W-2 reporting detail together.
A monthly control that takes less than an hour
At each month-end, compare the payroll register to the general ledger and bank activity. For supplemental wages, confirm:
- Gross bonuses, commissions, overtime, tips, and taxable benefits agree to payroll detail.
- Employee withholding liabilities agree to deposits and remain payable only until remitted.
- Employer payroll-tax expense agrees to the payroll reports.
- The year-to-date supplemental-wage total is correct for each employee and related employer.
- Overtime records distinguish the FLSA premium and any bonus-related regular-rate adjustment.
- The cumulative data needed for 2026 W-2 code TT is being retained.
This review turns a one-time bonus into an ordinary, auditable transaction. It also gives you a timely warning when a compensation plan is creating more payroll cost than your pricing or cash forecast assumed.
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