Kansas Bonus Pay Tax Calculator

2026 Kansas bonus withholding

Kansas Bonus Pay Tax Calculator

Estimate a Kansas employee's net bonus with the state's federal-method pairing rule, 5% separately stated payment method, Kansas aggregate tables, K-4 allowances, multistate credit planning, annual wage caps, employer costs, and net-to-gross calculations.

Calculate a full Kansas 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 For an employee not marked federal exempt, Kansas follows the resolved federal base method: a valid federal percentage method pairs with 5% Kansas withholding, while a federal aggregate calculation pairs with Kansas aggregate/difference treatment. The federal-exemption control below explains the separate low/high partition and review warning for a mandatory portion above $1 million.

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

Employee has a valid federal income-tax withholding exemption

Use only with valid current federal exemption documentation. Below the federal $1 million supplemental-wage threshold, KW-100 makes the payment exempt from both federal and Kansas income-tax withholding. Mandatory excess portions still use 37% federal and, when Kansas withholding otherwise applies, this estimator uses 5% Kansas on that same high portion; verify this rare hybrid with KDOR or payroll. FICA and employer taxes remain.

Kansas withholding settings

Kansas withholding profile Profiles are deterministic planning starting points; Custom preserves manual state. Confirm Kansas residency, work location, K-4, K-4C, and other-state withholding records before payroll.

Kansas income-tax withholding applies

A valid exempt K-4 requires both no Kansas income-tax liability for the prior year and an expectation of no Kansas income-tax liability for the current year. Wages outside Kansas that are not subject to Kansas withholding can also clear this control.

Kansas method pairing Automatic and not independently elective. Federal percentage withholding pairs with Kansas 5%; federal aggregate withholding pairs with the Kansas table difference.

K-4 allowance rate Used by the Kansas table path. Missing K-4 treatment uses Single and zero allowances. K-4 line D directs head-of-household filers to use the Single rate and enter 2 allowances.

Total K-4 allowances Single: first allowance $9,160 annually. Joint: first two total $18,320. Each additional allowance is $2,320 annually.

Kansas withholding allocation percentage KDOR guidance applies a supportable Kansas-source percentage to the computed withholding amount, not to wages before the table.

Regular wages for the Kansas comparison period Used only when the resolved federal method is aggregate. Use wages from the same comparison payroll period.

Regular Kansas withholding baseline Calculated mode applies the same allocation to regular and combined table amounts. Actual mode treats the entered paystub amount as already allocated.

Actual Kansas withholding on regular wages Used only in Actual mode. Enter the state amount already withheld from the regular wages in the comparison period.

Other-state withholding credit for this payment For a Kansas resident working outside Kansas, enter supportable withholding required by the other state. It reduces Kansas base withholding, not below zero.

Additional Kansas withholding on this payment K-4 line 5 is per paycheck. This amount is added once after allocation and other-state credit; it is not inserted into both aggregate baselines.

Round Kansas percentage-method amounts to whole dollars

KW-100 permits whole-dollar rounding. Default is exact cents; enable this to reproduce rounded payroll examples.

Kansas follows the resolved federal base method for an ordinary non-exempt employee. A separately stated bonus using valid federal percentage withholding uses 5% of gross for Kansas. A federal aggregate calculation uses the Kansas percentage table on regular and combined wages and subtracts the regular baseline. The federal 37% overlay does not silently switch those ordinary Kansas methods. For a documented federal exemption, the low portion is exempt from both taxes; any mandatory portion above $1 million is modeled separately at 37% federal and, when Kansas withholding otherwise applies, 5% Kansas with an explicit review warning because KW-100 does not state the hybrid calculation. Allocation is applied to computed Kansas withholding, other-state credit cannot reduce the base below zero, and K-4 additional withholding is added once.

Employer cost estimate settings

Kansas UI employer status Reimbursing employers repay eligible benefit charges rather than using this contribution-rate estimate. Enter actual costs outside this calculator.

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

Kansas UI wage base KDOL lists a $15,100 taxable wage base for 2026.

Kansas UI employer rate 2026 contribution rates range from 0% through 6.95%. The default is the 1.75% new nonconstruction rate; new construction is 5.55%.

Kansas UI-taxable bonus percentage This changes employer cost only. K.S.A. 44-710 prohibits deducting employer Kansas UI contributions 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 against the 6.0% gross FUTA rate. Final 2026 credit-reduction status is determined later.

Estimated net bonus

Flat supplemental method with 2026 Kansas 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

Paired federal and Kansas methods

Model the federal 22%/37% percentage path with Kansas 5%, or federal aggregate withholding with the Kansas combined-minus-regular table method. Compare mode keeps each pair together.

K-4 and multistate controls

Use Single or Joint allowance rates, total allowances, calculated or actual regular withholding, allocation after the table, other-state credit, optional whole-dollar rounding, and one fixed additional amount.

Employee and employer costs separated

Test Social Security, Additional Medicare, employer-only Kansas UI, and FUTA against separate inputs. Kansas city and county income taxes are not added.

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 or common-paymaster rules, residency facts, multistate sourcing, actual other-state withholding, UI account status, and payroll-provider rounding can change the paycheck. Withholding is not final income-tax liability.

Kansas bonus withholding FAQ

Does Kansas have a flat bonus withholding rate?

Yes, when a supplemental payment is stated separately and federal withholding is computed as a percentage. KW-100 directs 5% Kansas withholding on the gross payment and gives a $1,000 bonus example with $50 withheld.

When does Kansas use aggregate withholding?

When regular and supplemental wages are combined and federal withholding uses the tables, Kansas follows the same approach. This estimator calculates Kansas withholding on combined wages and subtracts the regular-period baseline.

Does the federal 37% excess rate switch Kansas to aggregate?

No. For an employee not marked federal exempt, this calculator follows the selected or required base federal method for the full Kansas bonus; the 37% overlay changes federal withholding only. The narrow federal-exemption hybrid is described separately below.

What if the employee is exempt from federal income-tax withholding?

Below the federal $1 million supplemental-wage threshold, KW-100 also makes the payment exempt from Kansas income-tax withholding. If a mandatory excess portion remains, this estimator applies 37% federal and, when Kansas withholding otherwise applies, 5% Kansas only to that high portion. KW-100 does not expressly resolve that rare hybrid, so verify it with KDOR or the payroll provider. FICA and employer taxes still apply.

How are K-4 allowances used?

The annual allowance amount is divided by the number of pay periods before the Kansas table is applied. Single begins with $9,160; Joint's first two total $18,320; additional allowances are $2,320 each.

How should head-of-household filing be entered?

K-4 line D directs a head-of-household filer to select the Single allowance rate and enter 2 allowances. This calculator follows that instruction through those two controls.

When can an employee claim K-4 exempt?

The current Form K-4 requires both no Kansas income-tax liability for the prior year and an expectation of no Kansas income-tax liability for the current year. Both conditions must be supported; this is not an either-or test.

Can Kansas withholding be rounded?

KW-100 permits percentage-method withholding to be rounded to the nearest whole dollar. This calculator defaults to cents and provides an optional rounding control.

Are Kansas local income taxes included?

No employee city or county income-tax control is added. K.S.A. 12-140 and the K.S.A. 19-101a limitation bar city and county income taxes in this context. Business or occupational license taxes are outside this employee bonus estimator.

Does Kansas unemployment tax reduce the bonus?

No. Kansas UI is an employer cost, and K.S.A. 44-710 prohibits deducting employer contributions from employee wages. The 2026 wage base is $15,100 and the assigned rate is editable.

Can this calculator gross up a promised net bonus?

Yes. Net-to-gross mode solves across the paired federal and Kansas methods, Social Security cap, Additional Medicare threshold, allocation, credit, and fixed additional withholding.

Research sources

Primary-source rules and destinations were checked July 24, 2026. KDOR's current KW-100 PDF is Rev. 10-24; its table rates remain supported for 2026 by the current rate materials and Notice 25-06. Recheck forms, assigned UI rate, and later agency revisions before production payroll.

Kansas Department of RevenueKW-100 Kansas Withholding Tax Guide landing page

Kansas Department of RevenueKW-100 Kansas Withholding Tax Guide, Rev. 10-24

Kansas Department of RevenueKansas withholding tax rates, Rev. 07/24

Kansas Department of RevenueNotice 25-06

Kansas Department of RevenueForm K-4 Employee's Withholding Allowance Certificate

Kansas Department of RevenueForm K-4C Nonresident Employee Certificate

Kansas Department of RevenueFrequently Asked Questions About Withholding

Kansas Office of Revisor of StatutesK.S.A. 79-3296

Kansas LegislatureK.S.A. 79-32,110

Kansas LegislatureK.S.A. 12-140

Kansas LegislatureK.S.A. 19-101a

Kansas LegislatureK.S.A. 44-703

Kansas LegislatureK.S.A. 44-710

Kansas Department of LaborEmployer Services

Kansas Department of Labor2026 Kansas unemployment tax rate notice

Internal Revenue ServicePublication 15 (Circular E), 2026

Internal Revenue ServicePublication 15-T, 2026

Social Security AdministrationContribution and Benefit Base

TimeTrexKansas Payroll Tax Calculator

TimeTrexTimeTrex Payroll

Move from a bonus estimate to a complete Kansas paycheck

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

Calculate a full Kansas paycheck Explore TimeTrex payroll

Disclaimer: This 2026 Kansas bonus pay calculator provides tax withholding estimates for one-time or nonperiodic supplemental wages paid to W-2 employees and is intended solely for informational and educational purposes. Actual net bonus amounts and employer tax liabilities may vary depending on federal supplemental withholding methods (22% flat vs. aggregate), Form K-4 allowance claims, multistate tax sourcing, employer-specific Kansas Department of Labor (KDOL) unemployment rates, and payroll system settings. This tool does not constitute official tax, legal, or accounting advice; employers and employees should consult a qualified tax professional or refer to official guidance from the IRS and the Kansas Department of Revenue (KDOR) before processing 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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Kansas Bonus Pay Tax Calculator