How Much Are Bonuses Taxed in Oklahoma: 22% and 4.5% Rates

Bonuses paid to Oklahoma employees in 2026 are typically withheld at a combined rate of about 34%: a flat 22% for federal income tax, 4.5% for Oklahoma income tax, and 7.65% for Social Security and Medicare. That is the amount your employer holds back from the check. Your actual tax bill is settled when you file your returns, and it can come out higher or lower than what was withheld.

The Federal 22% Flat Rate

The IRS classifies bonuses as “supplemental wages,” alongside commissions, overtime, and severance. When a bonus is paid separately from a regular paycheck, employers withhold a flat 22% for federal income tax regardless of your W-4 or your usual bracket.¹ P.L. 119-21 made this rate permanent by extending the individual tax rates from the 2017 Tax Cuts and Jobs Act.

If your supplemental wages for the year cross $1 million, everything above that threshold is withheld at 37%, the top individual rate.¹ W-4 elections do not override this.

The Oklahoma 4.5% Rate

Oklahoma’s top individual income tax rate dropped from 4.75% to 4.5% for tax year 2026 under HB 2764, which also collapsed six brackets into three.² The state’s supplemental wage withholding rate tracks that top rate, so 4.5% comes off your bonus for Oklahoma income tax.³

The 4.5% bracket starts at $7,200 of taxable income for a single filer and $14,401 for married couples filing jointly.² Since most bonus recipients already earn well above those thresholds from salary alone, the full bonus is normally withheld at 4.5%. Oklahoma law allows further 0.25% reductions in coming years if state revenue conditions are met.

Social Security and Medicare

Every bonus dollar is subject to FICA, no matter how income tax is handled.¹ For 2026:

Social Security: 6.2% on wages up to $184,500⁴
Medicare: 1.45% on all wages, no cap¹
Additional Medicare: an extra 0.9% once wages exceed $200,000 (single) or $250,000 (married filing jointly)⁵

Two wrinkles matter. First, once your year-to-date wages with an employer pass $184,500, the 6.2% Social Security piece stops for the rest of the year, so a late-year bonus can be withheld at a lower combined rate.⁴ Second, employers start withholding the Additional Medicare Tax at $200,000 regardless of your filing status. If you file jointly and your real threshold is $250,000, you claim the credit back when you file.⁶

A $5,000 Bonus, Worked Out

For an Oklahoma employee receiving a $5,000 bonus mid-year, before hitting the Social Security wage base:

Federal income tax at 22%: $1,100
Oklahoma income tax at 4.5%: $225
Social Security at 6.2%: $310
Medicare at 1.45%: $72.50
Total withheld: $1,707.50
Take-home: about $3,292.50

That is a combined withholding rate of roughly 34.15%. It moves if you have already crossed the Social Security wage base, if the Additional Medicare Tax kicks in, or if your employer uses the aggregate method described below.

Why Two Bonus Checks Can Be Withheld Differently

Employers pick between two federal withholding methods, and the choice changes what comes out of the check.

Flat Percentage Method

When the bonus is paid on a separate check, the employer can apply the 22% federal rate straight to the bonus without touching your regular payroll math.¹ This is the common approach and the one behind the 34% figure above.

Aggregate Method

When the bonus is bundled into a regular paycheck, the employer treats the combined amount as one payment and runs it through the standard withholding tables, as if you earned that inflated total every pay period.¹ The result is often higher withholding, because that one paycheck looks like it belongs to a higher bracket. Any over-withholding comes back at tax time.

You do not usually get to pick the method. Either way, withholding is a prepayment, not the final tax.

Non-Cash Bonuses Count Too

A bonus does not have to be cash. Trips, merchandise, gift cards, and similar property are taxed on their fair market value, meaning what the item or experience would cost on the open market rather than what your employer paid.⁷

A narrow “de minimis” exception covers items too small and infrequent to track, such as a holiday ham, occasional event tickets, or branded swag.⁸ There is no fixed dollar cutoff. Cash and gift cards are never de minimis, no matter how small the amount.

Avoiding a Surprise Bill

A big bonus can leave you underpaid for the year even after withholding, and both taxing authorities charge a penalty when that happens.

Federal Safe Harbor

You avoid the federal underpayment penalty if your total withholding hits one of two marks: at least 90% of your current-year tax, or at least 100% of last year’s tax (110% if your prior-year adjusted gross income was over $150,000).⁹ If a bonus is going to blow past those numbers, you can raise withholding on later paychecks or send a quarterly estimated payment on Form 1040-ES.¹⁰

Oklahoma Estimated Tax

Oklahoma requires estimated payments when you expect to owe more than $500 beyond your withholding and that withholding will fall short of either 70% of the current year’s liability or 100% of the prior year’s. The underpayment penalty is interest at 20% per year on the shortfall. No penalty applies if your total state tax comes in under $1,000.¹¹

What You Actually Owe Versus What Was Withheld

Everything held back from the bonus is a prepayment. Your employer reports the wages and the taxes in Boxes 1, 2, 4, and 6 of your W-2.¹² When you file federal Form 1040 and Oklahoma Form 511, your real liability is calculated on your total annual income, deductions, and credits.

If your effective rate ends up lower than the 22% federal flat rate, the difference comes back as a refund. If the bonus pushed you into a higher bracket, you pay the shortfall. The withholding method your employer used affects when the money moves, not the final tax.

1
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
2
Oklahoma Legislature. Summary of 2025 Tax Legislation
3
Oklahoma Tax Commission. 2026 Oklahoma Income Tax Withholding Tables
4
Social Security Administration. Contribution and Benefit Base
5
Internal Revenue Service. Topic No. 560, Additional Medicare Tax
6
Internal Revenue Service. Questions and Answers for the Additional Medicare Tax
7
Internal Revenue Service. Publication 525, Taxable and Nontaxable Income
8
Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits (2026)
9
Internal Revenue Service. Estimated Tax
10
Internal Revenue Service. Large Gains, Lump Sum Distributions, Etc.
11
Oklahoma Tax Commission. Individuals – Pay Taxes
12
Internal Revenue Service. General Instructions for Forms W-2 and W-3 (2026)