Kentucky Bonus Tax Calculator
Estimate take-home pay on your bonus in Kentucky. Federal 22% + Kentucky 3.5% + FICA. On a $10,000 bonus with $80,000 year-to-date wages, net take-home is about $6,685.
By Sammy S. · Founder · AuthorUpdated for 2026
Bonus details
Results update live on the right
Used for the Social Security wage base and Additional Medicare Tax
33.1% effective
Take-home bonus
$3,343
of $5,000 gross
Full tax breakdown
Kentucky bonus tax rates at a glance
Supplemental withholding rates used on bonuses in 2026
How bonuses are taxed in Kentucky
Federal supplemental method + state withholding
Federal + FICA on bonuses
Bonuses are supplemental wages under IRS Publication 15. When your employer uses the flat-rate percentage method, they typically withhold 22% federal (37% on amounts over $1M per employer per year), plus Social Security at 6.2% up to the 2026 wage base of $184,500, and Medicare at 1.45% (plus 0.9% Additional Medicare Tax above the applicable threshold).
No separate supplemental table; educational estimate uses the state’s flat PIT ≈3.5%.
Kentucky state tax on bonuses
Kentucky withholds about 3.5% on supplemental wages in our model — roughly $350 state tax on a $10,000 bonus with $80,000 year-to-date wages.
Vignette: $10,000 bonus
Total withholding ≈ $3,315 — net take-home ≈ $6,685 (33.15% effective).
Bonus take-home ladder in Kentucky
Engine-sourced estimates with $80,000 YTD wages (flat supplemental method)
| Gross bonus | State tax | Total withheld | Net take-home |
|---|---|---|---|
| $5,000 | $175 | $1,657.50 | $3,342.50 |
| $10,000 | $350 | $3,315 | $6,685 |
| $25,000 | $875 | $8,287.50 | $16,712.50 |
| $50,000 | $1,750 | $16,575 | $33,425 |
Withholding is not your final tax bill
22% federal is an estimate — plan for the gap
Flat supplemental withholding is not your final tax liability. If your marginal federal bracket is above 22%, a large bonus can leave a shortfall at filing. If your bracket is below 22%, you may over-withhold and get a refund. Kentucky state withholding at 3.5% is also an estimate against your full-year state liability.
Employers may use the aggregate method instead of the flat rate — combining the bonus with regular wages. Confirm with payroll which method applies.
Rankings and state comparisons
Kentucky ranks #35 for state supplemental withholding on bonuses
See how Kentucky compares to all 50 states and DC in our Kentucky bonus tax by state profile — includes peer states, bonus ladder, and corridor compares.
Compare bonus tax by state
How Kentucky compares to high-tax and no-tax states
All jurisdictions use federal 22% + FICA — only the state supplemental rate differs.
Browse every state calculator
The take-home bonus above comes from the bonus amount, year-to-date earnings, and state you enter—not a third-party feed. We apply the IRS flat-rate supplemental withholding method (22% federal), FICA taxes with the Social Security wage base and Additional Medicare threshold, and your state's supplemental withholding rate when selected. Below are the formulas, the order we follow, and worked examples you can check by hand.
Formulas
| Line | Formula |
|---|---|
| Federal supplemental withholding | Bonus × 22% when bonus is $1,000,000 or less |
| Federal withholding over $1M | ($1,000,000 × 22%) + ((bonus − $1,000,000) × 37%) |
| Social Security | Lesser of (bonus, remaining wage base) × 6.2% |
| Remaining Social Security wage base | Max(0, wage base − year-to-date earnings before bonus) |
| Medicare | Bonus × 1.45% |
| Additional Medicare | Wages over $200,000 × 0.9% (applied to the portion of the bonus above the threshold) |
| State supplemental withholding | Bonus × state supplemental rate (0% in no-income-tax states) |
| Additional withholding | Flat dollar amount you enter (per W-4 extra withholding election) |
| Total withholding | Federal + Social Security + Medicare + Additional Medicare + state + extra withholding |
| Net bonus (take-home) | Gross bonus − total withholding |
| Effective withholding rate | Total withholding ÷ gross bonus |
Order of operations
Apply federal supplemental withholding
22% flat rate on the full bonus (or split 22% / 37% above $1M)
This is withholding on your paycheck—not your final tax bill. The IRS allows employers to withhold supplemental wages at a flat 22% when paid separately from regular wages. Bonuses over $1 million in a calendar year from one employer use 37% on the excess.
Calculate Social Security tax
6.2% on bonus wages up to the annual wage base
Social Security applies only to wages not yet subject to the cap. If your year-to-date earnings already reached the wage base ($184,500 in 2026), no Social Security is withheld on this bonus.
Calculate Medicare tax
1.45% on the full bonus amount
Unlike Social Security, Medicare has no wage cap. Every dollar of the bonus pays the 1.45% employee Medicare tax.
Add Additional Medicare if over $200,000 YTD
0.9% on the portion of the bonus that pushes total wages over $200,000
If year-to-date earnings plus the bonus exceed $200,000, the wages above that threshold pay an extra 0.9% Medicare surtax on the employee side only.
Apply state supplemental withholding
Bonus × state supplemental rate
Each state sets its own supplemental withholding rate. We use published flat supplemental rates—not your actual state income tax bracket. Local taxes (e.g. NYC) are not included unless noted on the page.
Add any extra withholding
Flat dollar amount from your W-4 election
If you elected additional federal withholding on Form W-4, enter that amount to see it deducted from your take-home.
Calculate net bonus
Gross bonus − all withholding
Your actual tax when you file may differ. You might receive a refund or owe more depending on your total income, deductions, and credits for the year.
Worked example
$10,000 bonus, $50,000 year-to-date earnings, no state selected, 2026
$10,000 × 22% = $2,200 federal withholding
$620 Social Security (6.2%) + $145 Medicare (1.45%) = $765 FICA
$10,000 − $2,965 total withholding = $7,035 take-home (29.65% effective rate)
| Line item | Amount |
|---|---|
| Gross bonus | $10,000 |
| Year-to-date earnings (before bonus) | $50,000 |
| Federal supplemental withholding (22%) | $2,200 |
| Social Security (6.2%) | $620 |
| Medicare (1.45%) | $145 |
| Additional Medicare (0.9%) | $0 |
| State withholding | $0 |
| Total withholding | $2,965 |
| Net bonus (take-home) | $7,035 |
| Effective withholding rate | 29.65% |
$10,000 × 10.23% = $1,023 California withholding. Total withholding $3,988 → take-home $6,012.
With $178,400 YTD earnings, only $6,100 of headroom remains under the $184,500 wage base. Social Security on a $10,000 bonus = $6,100 × 6.2% = $378.20 (not the full $620).
A $1,500,000 bonus from one employer: 22% on the first $1M ($220,000) + 37% on the remaining $500,000 ($185,000) = $405,000 federal withholding before FICA and state.
2026 rates and limits we use
| Parameter | What we use |
|---|---|
| Federal supplemental rate (under $1M) | 22.0% |
| Federal supplemental rate (over $1M) | 37.0% |
| Social Security wage base (2026) | $184,500 |
| Social Security rate | 6.20% |
| Medicare rate | 1.45% |
| Additional Medicare rate | 0.90% |
| Additional Medicare threshold | $200,000 |
| California supplemental rate (example) | 10.23% |
| Texas supplemental rate | 0% (no state income tax) |
What we do not model on this page
We use the flat-rate supplemental withholding method only—not the aggregate method (combining bonus with regular wages on one check). We do not model local city taxes, state disability insurance, or employer-specific withholding choices. State rates are supplemental withholding estimates, not your final state tax liability. Filing status does not change federal supplemental withholding on this page. Your actual tax is reconciled when you file Form 1040.
Official references
Primary sources for bonus withholding rules
Disclaimer: Estimates for planning purposes only. Not tax, legal, or payroll advice. Actual withholding depends on your employer's payroll system, additional income, deductions, filing status, and method (flat vs aggregate). Consult a qualified tax professional for guidance specific to your Kentucky situation.
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