Kansas tax filing: file KS state taxes online, Form K-40, 5.2% to 5.58%

Do you have to file a Kansas tax return?

Kansas ties the filing requirement to your Kansas adjusted gross income against the sum of your standard deduction and personal exemption. If your income is below that combined floor, you generally do not have to file. The Kansas Department of Revenue publishes the exact minimums in the front of the K-40 instructions.

Those floors are the standard deduction plus the exemption allowance for each status, which is why the head of household figure sits above the single figure: head of household filers claim an extra $2,320 exemption. Full-year residents file Form K-40. Part-year residents and nonresidents also file the K-40 and attach Schedule S to report which portion of their income was earned in Kansas. Any Kansas-source income, such as wages from a job in the state or rent from Kansas property, can trigger a nonresident return.

File anyway if Kansas tax was withheld from your pay, you made estimated payments, or you qualify for a refundable credit like the Kansas Earned Income Tax Credit or the food sales tax credit, because a return is the only way to get that money back. The rules come from the Kansas Department of Revenue, and the state tax filing pillar compares Kansas with the other states.

What is the Kansas income tax rate for 2025?

For tax year 2025 Kansas uses two brackets. Kansas taxable income up to $23,000 for single filers, or $46,000 for married couples filing jointly, is taxed at 5.20 percent. Income above that threshold is taxed at 5.58 percent. The 2024 special-session reform (Senate Bill 1) collapsed the old three-bracket schedule, which had started at 3.1 percent, into this flatter two-rate structure.

Kansas starts from your federal adjusted gross income, then adds a short list of Kansas additions and subtractions on Schedule S to reach Kansas AGI, subtracts your standard or itemized deduction and your exemption allowance, and applies the two-bracket rate to what is left. A single filer with $50,000 of Kansas taxable income owes about $1,196 on the first $23,000 plus $1,506 on the remaining $27,000, roughly $2,702 before credits. Filers with taxable income over $100,000 use the tax computation worksheet rather than the tax tables. TaxFile runs this math for you and applies the credits below.

Kansas standard deduction and personal exemptions for 2025

The 2024 reform did more than change the rates. It raised the standard deduction and set a new, larger personal exemption, and both together decide how much income escapes Kansas tax before the 5.20 percent rate ever applies.

Head of household filers get an extra $2,320 exemption on top of the $9,160 base, which is why the head of household filing floor is $17,660 rather than $15,340. Filers who are 65 or older or blind add an extra amount to the standard deduction, the same way the federal return works, using the worksheet in the K-40 instructions. Kansas also grants an additional $2,320 exemption for a child born during the tax year, for a stillbirth, and for a qualified disabled veteran. You can itemize on the Kansas return if your Kansas itemized deductions beat the standard deduction, and Kansas itemizing is decoupled from the federal choice, so it is worth checking both.

On the credit side, Kansas offers a refundable Earned Income Tax Credit equal to 17 percent of your federal EITC, a food sales tax credit for lower-income residents and seniors, a Child and Dependent Care Credit set at a percentage of the federal credit, and the Homestead property tax refund for eligible homeowners and renters. TaxFile applies each credit you qualify for.

Social Security and retirement income in Kansas

Kansas made a big change for retirees in 2024: it now exempts all Social Security benefits for every filer, no matter how high your income. Before 2024, Kansas taxed Social Security in full once your federal AGI passed $75,000, one of the harshest cliffs in the country. That cliff is gone.

The distinction that trips people up is that Kansas exempts public and government retirement in full, KPERS, federal civil service, military and railroad, but still taxes private pensions, IRAs and 401(k) withdrawals at the regular rate. So a retired teacher on a KPERS pension may owe no Kansas tax at all, while a retiree living on 401(k) draws still owes on those withdrawals. Interest from U.S. government obligations is also subtracted on Schedule S. TaxFile sorts each retirement source into the right column so you do not exempt something taxable or tax something exempt.

Kansas filing deadline, extension and filing online

Kansas follows the federal April 15 deadline. It does not have its own extension form. If you filed federal Form 4868 for an automatic extension, Kansas honors it automatically, and you enclose a copy of the federal extension when you file the K-40. The extension only pushes the filing date, not the payment date: any Kansas tax you owe is still due April 15, and you pay it with Form K-40V to stop penalty and interest from running. Kansas requires quarterly estimated payments (Form K-40ES) when you expect to owe $500 or more beyond withholding.

TaxFile prepares the federal and Kansas returns together:

• Upload or talk. Drop in your W-2s and 1099s and it reads them, or describe your year and it asks what it needs.
• Federal and Kansas together. One set of documents produces both returns, with the two-bracket rate, the raised deduction and your exemptions applied.
• Credits checked. It applies the Social Security subtraction, exempt public and military retirement, the 17 percent Kansas EITC and the food sales tax credit where they fit.
• Error check, then you approve. Nothing is e-filed until you review and approve every line, through an authorized IRS e-file provider.

Pricing is $39 for a simple return, $89 self-employed, $199 business, plus $19 for each state return. There is no free tier. If your Kansas income comes from contract or freelance work, self-employed tax filing covers Schedule C and Schedule SE, and Schedule C software walks through the business side. If you worked in more than one state during 2025, filing taxes in two states explains how the credit for tax paid to another state keeps you from being taxed twice. TaxFile does not e-file federal extensions or amended returns, and does not handle capital gains on Schedule D, rental income on Schedule E, or cryptocurrency. TaxFile is self-prepared tax software and does not provide personalized tax advice, and no refund amount is guaranteed.