Kansas Income Tax Calculator - Estimate Your KS State Tax
Enter your federal adjusted gross income, filing status, and tax year into the Kansas income tax calculator to see Kansas taxable income and state tax at the flat Kansas rate after the standard or itemized deduction.
Kansas Income Tax Calculator
Results
What Is the Kansas Income Tax Calculator?
The Kansas income tax calculator estimates the state income tax you owe to Kansas for tax years 2024 through 2027. You enter your federal adjusted gross income, your filing status, and the tax year, and the tool applies the flat Kansas rate to your Kansas taxable income after deductions. Kansas is a flat-tax state, so every dollar of taxable income is taxed at the same rate rather than across graduated brackets.
- • Estimate a K-40 balance due: Run your numbers before filing Form K-40 so you know whether to expect a refund or a payment.
- • Compare tax years: See how the scheduled rate phase-down from 5.05% in 2024 to 4.55% in 2027 changes your bill.
- • Decide standard vs itemized: Check whether itemizing your federal Schedule A deductions lowers your Kansas tax.
- • Model a Social Security subtraction: Confirm how much the Kansas Social Security exemption removes from your taxable base.
Kansas rebuilt its individual income tax around a single flat rate starting with tax year 2023. That means the marginal rate and the effective rate move together, which makes planning simpler than in bracket-based states.
This calculator focuses on the state portion only. Your federal liability is a separate calculation, and because Kansas starts from your federal AGI, the two returns are linked.
Because Kansas builds its tax base from your federal return, start with the federal income tax calculator to estimate the federal side first.
How the Kansas Income Tax Calculator Works
The calculator follows the same path the Kansas Department of Revenue uses on Form K-40: start with federal adjusted gross income, subtract Kansas-only items, subtract a deduction, then multiply by the flat rate.
- Federal AGI: Your adjusted gross income from IRS Form 1040, line 11.
- Social Security Subtraction: Kansas-taxed Social Security benefits you remove from the base; Kansas does not tax them.
- Standard / Itemized Deduction: The larger of the Kansas standard deduction or your federal Schedule A total.
- Flat Rate: 5.05% (2024), 4.90% (2025), 4.70% (2026), or 4.55% (2027).
Kansas starts from federal AGI because the state form is built on top of your federal return. Most federal income stays in the Kansas base, but a few state subtractions come out first.
After subtractions and the deduction, the remaining Kansas taxable income is multiplied by the flat rate for the year you selected. The result is your Kansas income tax before any credits.
Single filer, 2025, $60,000 AGI
Federal AGI $60,000, single, tax year 2025, no Social Security subtraction, standard deduction $15,000.
Kansas taxable income = 60,000 - 0 - 15,000 = 45,000. Tax = 45,000 x 4.90% = 2,205.
Kansas income tax = $2,205.
The effective rate on total AGI is about 3.68%, lower than the 4.90% flat rate because the standard deduction removes the first $15,000.
Married filing jointly, 2026, $120,000 AGI
Federal AGI $120,000, married filing jointly, tax year 2026, standard deduction $31,500.
Kansas taxable income = 120,000 - 31,500 = 88,500. Tax = 88,500 x 4.70% = 4,159.50.
Kansas income tax = $4,159.50.
The larger joint standard deduction pushes more income out of the base than a single filer would see at the same AGI.
According to IRS Publication 17 - Your Federal Income Tax, Federal adjusted gross income from Form 1040 is the base Kansas uses before state subtractions and deductions.
According to IRS Form 1040 - Adjusted Gross Income, Federal AGI from IRS Form 1040, line 11 is the starting input for the Kansas calculation.
If you need to find your starting number, the AGI calculator walks through the line-by-line adjustments that produce federal AGI.
Key Concepts Explained
Four ideas drive every Kansas result. Understanding them helps you read the output and spot when to itemize or claim a subtraction.
Flat tax rate
Kansas applies one rate to all taxable income. The rate is 5.05% in 2024, 4.90% in 2025, 4.70% in 2026, and 4.55% in 2027, scheduled by state law.
Federal AGI as the base
Kansas taxable income begins with your federal AGI. Federal adjustments you already made flow into the Kansas calculation, so the two returns stay connected.
Standard vs itemized deduction
Kansas uses the federal standard deduction amounts and also lets you itemize using federal Schedule A. You take whichever is larger.
Social Security subtraction
Kansas exempts Social Security benefits from state tax. Subtract any federally taxed benefits to keep them out of your Kansas base.
These concepts explain why two filers with the same AGI can owe different Kansas tax: filing status changes the standard deduction, and itemizing or a Social Security subtraction changes the base.
Kansas is one of several flat-tax states; compare your result with the Colorado income tax calculator to see how a neighboring flat rate differs.
How to Use This Calculator
Follow these steps to get a reliable estimate. Have your federal return or a draft AGI handy before you start.
- 1 Enter federal AGI: Type your adjusted gross income from Form 1040, line 11. This is the starting point for Kansas.
- 2 Pick filing status: Choose single, married filing jointly, head of household, or married filing separately. This sets your standard deduction.
- 3 Select tax year: Choose 2024 through 2027 to apply the correct flat rate for that year.
- 4 Add the Social Security subtraction: If your federal AGI includes taxed Social Security, enter that amount so Kansas removes it from the base.
- 5 Choose standard or itemized: Use the standard deduction, or switch to itemized and enter your Schedule A total to compare.
- 6 Read the results: The tool shows Kansas taxable income, the flat rate, your tax, and the effective rate as you change inputs.
A single W-2 earner with $60,000 AGI and no Social Security income selects 2025, leaves the subtraction at 0, and uses the standard deduction. The calculator returns $45,000 of Kansas taxable income and $2,205 of tax, which matches the worked example above.
For a regional comparison, the Arkansas income tax calculator shows how a bordering state with different brackets handles the same income.
Benefits of Using This Calculator
Beyond a single number, the calculator helps you make specific decisions before you file.
- • Plan withholding and payments: Estimate your K-40 balance early so you can adjust withholding or set aside money for a payment.
- • Compare tax years: See how the phase-down from 5.05% to 4.55% affects your bill across 2024 through 2027.
- • Test the itemizing choice: Toggle itemized vs standard to learn which deduction lowers your Kansas tax.
- • Value the Social Security subtraction: Quantify how much the Kansas Social Security exemption saves a retired filer.
- • Model life changes: Run 'what if' scenarios for a raise, marriage, or a second income before they happen.
Because the flat rate is the same for everyone, the biggest levers on your bill are the deduction choice and any subtractions, which the calculator makes easy to test.
Once you know your tax, pair it with the annual income calculator to see what your take-home pay looks like across the year.
Factors That Affect Your Results
Several inputs shift your Kansas tax. Knowing them helps you enter realistic numbers and avoid surprises at filing time.
Filing status
Married filing jointly and head of household receive larger standard deductions than single or married filing separately, lowering taxable income.
Itemized deductions
If your Schedule A total beats the standard amount, itemizing removes more income from the Kansas base.
Social Security subtraction
Retirees with taxed Social Security benefits can subtract them entirely, which can drop taxable income by several thousand dollars.
Tax year
The flat rate falls from 5.05% in 2024 to 4.55% in 2027, so the same income owes less in later years.
Other state subtractions
Kansas allows additional subtractions beyond Social Security; this calculator models the most common one, so unusual items may change your real bill.
- • This tool estimates individual income tax before credits. Kansas tax credits you qualify for are not included and could lower the final amount.
- • Standard deduction amounts are indexed for inflation; 2026 and 2027 figures are based on current law and may adjust slightly before those returns are due.
Treat the output as an estimate for planning, not as a substitute for the official Form K-40 prepared from your actual documents.
As published by Kansas Legislature - Session Laws, Kansas statute provides the standard deduction and Social Security subtraction used to derive Kansas taxable income.
Social Security treatment varies by state; the Illinois tax calculator shows a flat-tax state that also exempts retirement income differently.
Frequently Asked Questions
Q: What is the Kansas state income tax rate?
A: Kansas uses a single flat individual income tax rate. For tax years 2024 through 2027 the rate phases down: 5.05% in 2024, 4.90% in 2025, 4.70% in 2026, and 4.55% in 2027. Every dollar of Kansas taxable income is taxed at the same rate; there are no progressive brackets for individuals.
Q: Does Kansas tax Social Security benefits?
A: No. Kansas does not tax Social Security retirement benefits. If your federal AGI includes Social Security that was taxed on your federal return, you subtract that amount on the Kansas return, so it is removed from your Kansas tax base before the flat rate is applied.
Q: What is the Kansas standard deduction for 2025?
A: Kansas conforms to the federal standard deduction. For tax year 2025 the amounts are $15,000 for single and married filing separately, $30,000 for married filing jointly, and $22,500 for head of household. If your federal Schedule A itemized deductions are larger, you can itemize instead.
Q: How is Kansas taxable income calculated from federal AGI?
A: Kansas starts with your federal adjusted gross income, subtracts Kansas-only items such as the Social Security subtraction, then subtracts the larger of your Kansas standard deduction or your itemized deductions. The remaining amount is Kansas taxable income, which is multiplied by the flat rate for your tax year.
Q: Does Kansas have a local or city income tax?
A: No. Kansas has no local, city, or county income tax on wages or salaries. Only the state flat rate applies to your Kansas taxable income, so the number from this calculator is your full Kansas income tax.
Q: When is the Kansas K-40 due and what rate applies in 2026?
A: The Kansas individual income tax return, Form K-40, is generally due April 15, the same as the federal return. For tax year 2026 the Kansas flat rate is 4.70%, applied to your Kansas taxable income after deductions.