Kentucky Bonus Pay Tax Calculator

2026 Kentucky bonus withholding

Kentucky Bonus Pay Tax Calculator

Estimate a Kentucky employee's net bonus with the state's required supplemental-wage aggregation rule, the 2026 3.5% formula, K-4 exemptions, editable local occupational taxes, federal methods, employer costs, and net-to-gross calculations.

Calculate a full Kentucky paycheck Explore TimeTrex payroll

Bonus inputs

Use gross-to-net for a planned bonus or net-to-gross when a take-home amount was promised. This tool is limited to one-time or nonperiodic taxable cash bonuses; use a full paycheck calculation for regular or periodic wages, commissions, and overtime.

Gross bonus amount Enter the taxable bonus to be paid.

Federal withholding method

Payment presentation Federal flat withholding can apply to a separately identified amount when eligible. Kentucky separately requires supplemental wages to be aggregated with current or preceding regular wages, so the federal and Kentucky methods are controlled independently.

Regular wages had federal income tax withheld

The optional 22% federal flat method generally depends on regular wages having had income tax withheld in the current or prior year.

Pay frequency

YTD Social Security wages from this employer Used only for the 2026 $184,500 Social Security wage-base check.

YTD Medicare wages from this employer Used for the employer's $200,000 Additional Medicare withholding threshold.

YTD supplemental wages before bonus Include supplemental wages paid in 2026 by this employer and businesses under common control for the $1 million federal test.

Regular wages for this pay period Used for aggregate withholding comparisons.

Federal W-4 settings

Federal filing status

Use higher W-4 Step 2 checkbox tables

Annual credits from W-4 Step 3

Annual other income from W-4 Step 4(a)

Annual deductions from W-4 Step 4(b)

Extra federal withholding per regular check

Extra federal withholding on this bonus

Actual federal withholding already taken from reference wages Aggregate mode subtracts federal income tax already withheld from the regular and earlier same-period reference wages. Leave blank to model that amount from the W-4 inputs above; if the federal eligibility box is clear, a blank baseline defaults to $0.

Kentucky income-tax withholding settings

Kentucky withholding profile Reciprocity is conditional for Virginia commuters and certain Ohio S-corporation shareholder-employees. A completed K-4 must support the exemption.

Kentucky income-tax withholding applies

Profile presets update this control. Clear it only when a current, properly completed K-4 and the employee's facts support an exemption.

Kentucky-taxable bonus percentage Kentucky residents are generally subject on wages inside and outside Kentucky. For a nonresident, enter the supportable Kentucky-service allocation unless reciprocity applies.

Regular Kentucky-taxable wages used for aggregation Use Kentucky-taxable regular wages for the current period, or the last preceding payroll period in the same year when a separate bonus is aggregated with that period.

Additional Kentucky withholding assigned to this bonus K-4 permits additional withholding per pay period. Enter only the amount the employer assigns to this bonus; do not repeat an amount already withheld from regular pay in the same period.

Kentucky requires aggregation for supplemental wages. The calculator computes 2026 formula withholding on regular Kentucky wages plus the allocated bonus, then subtracts formula withholding on the regular wages alone. The formula annualizes wages, subtracts the $3,360 standard deduction, applies 3.5%, and divides by the pay periods.

Kentucky local occupational tax settings

Local tax preset Kentucky DOR does not administer local occupational taxes. Confirm every city, county, school, or special-district rule for the work location.

Local jurisdiction A label

Local A employee rate Enter a percent, such as 1.25 for 1.25%.

Local A taxable bonus percentage

YTD Local A taxable wages before bonus

Local A annual wage cap Enter 0 when the jurisdiction has no wage cap.

Local jurisdiction B label

Local B employee rate

Local B taxable bonus percentage

YTD Local B taxable wages before bonus

Local B annual wage cap

The Louisville presets use current official W-1 instructions: 1.45% on compensation for work in Louisville/Jefferson County, plus a 0.75% school-board component for residents, for a 2.20% resident rate. Other Kentucky local bases, caps, exemptions, and overlapping jurisdictions vary.

Employer cost estimate settings

YTD Kentucky UI wages before bonus Used only for the employer-side Kentucky unemployment wage-base estimate.

Kentucky UI wage base Kentucky's official UI portal lists a $12,000 taxable wage base for 2026.

Kentucky UI employer rate The 2.70% default is the general statutory new-employer rate. Construction and experience-rated employers can differ; enter the rate on the 2026 notice.

Kentucky UI-taxable bonus percentage This changes employer cost only; Kentucky UI cannot be deducted from employee wages.

YTD FUTA wages before bonus Used only for the employer-side $7,000 FUTA wage-base estimate.

Estimated net FUTA rate Default assumes the full 5.4% state credit. Use the employer's actual net FUTA rate and any applicable credit-reduction treatment.

Estimated net bonus

Flat supplemental method with 2026 Kentucky rules.

Net bonus $0.00 Tax withholding estimate updates as inputs change.

Gross bonus $0.00

Total withheld $0.00

Effective withholding 0.00%

Employer cost estimate $0.00

Withholding line	Amount

Method comparison

Method	Net bonus	Total withheld

What this calculator includes

Federal supplemental methods

Model the optional 22% method, the mandatory 37% rate only above $1 million of calendar-year supplemental wages, and the aggregate method using the 2026 Publication 15-T tables.

Kentucky required aggregation

Apply the 2026 3.5% computer formula and $3,360 standard deduction to combined regular wages and bonus, then subtract the regular-wage result.

State, local, and employer costs separated

Keep Kentucky income tax, up to two editable local occupational taxes, employee FICA, Kentucky UI, and FUTA in their correct employee or employer columns.

This is a 2026 withholding estimate for an ordinary taxable cash bonus paid to a W-2 employee. Pretax benefits, retirement deferrals, wage exclusions, garnishments, prior same-period supplemental payments, multiple employers, successor/common-paymaster rules, reciprocity, resident credits, multistate sourcing, local occupational-tax bases, and payroll-provider rounding can change the actual paycheck. Withholding is not final income-tax liability.

Kentucky bonus withholding FAQ

Does Kentucky have a flat bonus withholding rate?

No. Kentucky's supplemental-wage regulation requires aggregation with regular wages. The 3.5% figure is the 2026 income-tax and formula rate, not a separate optional bonus method.

How does the Kentucky calculation work?

The formula annualizes pay-period wages, subtracts the $3,360 standard deduction, applies 3.5%, and divides by the pay periods. The bonus withholding is the combined result minus the regular-wage result.

What if the bonus is paid on a separate check?

Kentucky still requires aggregation. The employer may combine the supplemental wages with regular wages for the current payroll period or the last preceding payroll period in the same calendar year.

What does the 2026 K-4 change?

K-4 documents one of four exemptions or additional withholding. It has no personal allowance or dependent calculation. An ordinary employee does not need a K-4 on file when neither an exemption nor extra withholding is requested.

Which reciprocal-state employees can be exempt?

Qualifying residents of Illinois, Indiana, Michigan, West Virginia, or Wisconsin may be exempt; Virginia requires daily commuting, and Ohio excludes a 20%-or-greater direct or indirect S-corporation shareholder-employee. A completed K-4 is required.

Are local occupational taxes included?

Only when selected or entered. Kentucky DOR does not administer local occupational taxes. The two editable rows can model overlapping jurisdictions, allocations, and caps; Louisville presets use the official 2.20% resident and 1.45% nonresident rates.

Does Kentucky unemployment tax reduce the bonus?

No. Kentucky UI is employer-paid. The panel uses the 2026 $12,000 wage base and an editable rate; 2.70% is a general new-employer default, while construction and experience-rated employers can differ.

Can this calculator gross up a promised net bonus?

Yes. Net-to-gross mode solves numerically across federal method rules, FICA thresholds, required Kentucky aggregation, local taxes, allocations, and wage caps.

Research sources

Primary-source rules and live pages were checked July 22, 2026. Kentucky's July 9 proposed amendment to 103 KAR 18:070 leaves the supplemental-wage aggregation rule unchanged. Recheck K-4 facts, local rules, the assigned UI rate, and later revisions before production payroll.

IRSPublication 15 (Circular E), 2026

IRSPublication 15-T, 2026

Social Security Administration2026 contribution and benefit base

IRSAdditional Medicare withholding

Kentucky General AssemblyCurrent 103 KAR 18:070 supplemental-wage rule

Kentucky General AssemblyJuly 2026 proposed amendment

Kentucky Department of Revenue2026 withholding tables and computer formula

Kentucky Department of Revenue2026 Form K-4

Kentucky Department of RevenueEmployer withholding instructions, March 2026

Kentucky Department of RevenueReciprocity exemption certificate

Kentucky Department of Revenue2026 employer payroll withholding

Kentucky Office of Unemployment Insurance2026 UI wage base and Schedule A status

Kentucky General AssemblyKRS 341.270 employer UI rates

Kentucky Business One StopLocal business and occupational taxes

Louisville Metro Revenue CommissionW-1 resident and nonresident rates

Move from a bonus estimate to a complete Kentucky paycheck

Estimate regular wages and the full paycheck picture with TimeTrex's free Kentucky Payroll Tax Calculator, or connect approved earnings, time records, and payroll in one workflow.

Calculate a full Kentucky paycheck Explore TimeTrex payroll

Disclaimer: This 2026 Kentucky bonus tax calculator estimates take-home pay and tax withholdings using federal supplemental methods, Kentucky Department of Revenue aggregation rules, and the 3.5% formula rate, but it does not constitute formal legal, financial, or tax advice. Actual paycheck results may vary due to individual Form K-4 exemptions, pre-tax deductions, multi-state allocations, local occupational tax rates, or employer-specific payroll configurations, meaning users should verify all final calculations and official state, local, and federal schedules with a qualified payroll professional before processing actual payroll.

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Disclaimer: The content provided on this webpage is for informational purposes only and is not intended to be a substitute for professional advice. While we strive to ensure the accuracy and timeliness of the information presented here, the details may change over time or vary in different jurisdictions. Therefore, we do not guarantee the completeness, reliability, or absolute accuracy of this information. The information on this page should not be used as a basis for making legal, financial, or any other key decisions. We strongly advise consulting with a qualified professional or expert in the relevant field for specific advice, guidance, or services. By using this webpage, you acknowledge that the information is offered “as is” and that we are not liable for any errors, omissions, or inaccuracies in the content, nor for any actions taken based on the information provided. We shall not be held liable for any direct, indirect, incidental, consequential, or punitive damages arising out of your access to, use of, or reliance on any content on this page.

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Kentucky Bonus Pay Tax Calculator