If you live outside Kansas but earned any income from a Kansas source during the tax year, you have to file a Kansas income tax return. Kansas filing requirements for nonresidents set no minimum dollar threshold: even a small amount of Kansas wages, rental income, or business profit is enough to trigger the return.1Kansas Department of Revenue. Frequently Asked Questions About Individual Income You use Form K-40, the same form residents use, and attach Schedule S, Part B to separate the Kansas-source portion of your income from everything else.
Nonresident or Part-Year Resident
The label matters because it changes what Kansas can tax. A part-year resident lived in Kansas for less than 12 months during the tax year — someone who moved into or out of the state mid-year. Part-year residents report the dates they lived in Kansas on Form K-40 and owe Kansas tax on all income received while living in the state, plus any Kansas-source income earned while living elsewhere.2Kansas Department of Revenue. 2025 Individual Income Tax Booklet A true nonresident, by contrast, owes Kansas tax only on income tied directly to Kansas sources.
Your Kansas filing status must match your federal status. If you and your spouse file a joint federal return and one of you is a Kansas resident while the other is not, you file a joint Kansas return as nonresidents.2Kansas Department of Revenue. 2025 Individual Income Tax Booklet You cannot switch status at the state level to lower the bill.
What Counts as Kansas Source Income
Kansas source income is what pulls you into the filing system. The main categories are:
- Wages and salaries for services physically performed in Kansas, including temporary assignments and project work.3Kansas State Legislature. Kansas Statute 79-32,109 – Definitions
- Rental income from real property or tangible personal property located in Kansas.
- Gambling winnings from Kansas lotteries, casinos, and pari-mutuel wagering.
- Dividends, interest, and gains from intangible property, but only when that property is actively used in a Kansas business.3Kansas State Legislature. Kansas Statute 79-32,109 – Definitions
li>Profits from a trade, profession, or business operated in Kansas, including partnership and S corporation income flowing from Kansas operations.
The intangible-property rule catches people out. Holding stock in a Kansas-headquartered corporation through a brokerage account does not make the dividends Kansas-source income for a nonresident. Owning an interest in a Kansas LLC that actively operates in the state does.
Remote Work: Physical Presence Controls
Kansas taxes nonresident wages based on where you actually did the work. Working remotely from your home in another state for a Kansas-based employer does not create Kansas-source income. Your wages become Kansas-source only when you physically perform the work inside Kansas.4Kansas Department of Revenue. KW-100 Kansas Withholding Tax Guide Kansas does not apply a “convenience of the employer” rule.
Hybrid schedules split the wages. Employers are instructed to multiply total withholding by the ratio of Kansas work days to total work days.4Kansas Department of Revenue. KW-100 Kansas Withholding Tax Guide If your employer withheld Kansas tax on your full salary anyway, you recover the excess when you file your nonresident return.
No Reciprocity With Neighboring States
Kansas has no reciprocity agreement with Missouri, Nebraska, Colorado, or Oklahoma. A commuter who lives across the line and works in Kansas cannot skip the Kansas return, and the employer must withhold Kansas tax starting on the first day of work.
Double taxation is handled by your home state, not Kansas. Nearly every state with an income tax gives its residents a credit for taxes paid to other states on the same income, so the Kansas tax you pay on commuter wages reduces your home-state liability dollar for dollar, up to the amount of home-state tax that would have applied. The paperwork doubles; the total tax generally does not.
How the Tax Is Calculated
Kansas does not use a separate nonresident rate. It calculates tax as if all of your income were Kansas income, then multiplies that figure by the share of your income that actually came from Kansas. That share is the nonresident allocation percentage, computed on Schedule S, Part B: you list federal income in one column and the Kansas-source portion in the adjacent column, and the ratio applies to your calculated tax.5Kansas Department of Revenue. Part B – Adjustments to Kansas Source Income
The underlying rate schedule is 5.20% on the first $23,000 of Kansas taxable income ($46,000 for married couples filing jointly) and 5.58% on amounts above that. Running the whole income through the brackets before applying the percentage means the Kansas portion is not simply taxed at the lowest bracket.
Standard Deduction
Nonresidents can claim the Kansas standard deduction:
- Single: $3,605
- Married filing jointly: $8,240
- Head of household: $6,180
Additional amounts of $850 (single and head of household) or $700 per qualifying spouse (married filing jointly) apply if you or your spouse are 65 or older, or blind.1Kansas Department of Revenue. Frequently Asked Questions About Individual Income You may instead itemize Kansas deductions under K.S.A. 79-32,120 regardless of whether you itemized federally.6Justia Law. Kansas Code 79-32-120 – Kansas Itemized Deductions of an Individual
Estimated Payments
If your Kansas tax after withholding and credits will be $200 or more, you are generally expected to make quarterly estimated payments on Form K-40ES. This hits nonresidents with Kansas rental income, self-employment income, or pass-through business income where no employer withholds on their behalf.
The 2026 due dates are:7Kansas Department of Revenue. Pub. KS-1515 Tax Calendar of Due Dates
- Voucher 1: April 15, 2026
- Voucher 2: June 15, 2026
- Voucher 3: September 15, 2026
- Voucher 4: January 15, 2027
Underpayment triggers a separate penalty calculated at the interest rate set under K.S.A. 79-2968, running from each missed payment date until the earlier of the actual payment date or the April filing deadline.8Kansas State Legislature. Kansas Statute 79-32,107 – Underpayment of Estimated Tax The 2026 base rate is 8%.9Kansas Department of Revenue. Property Tax Interest Rates for Calendar Year 2026
Deadline, Filing, and Extensions
The Kansas deadline matches the federal deadline: April 15 of the year after the tax year, moving to the next business day when April 15 falls on a weekend or holiday. You can file electronically through Kansas WebFile or mail Form K-40 to the Department of Revenue.
Kansas has no separate extension form. If you file federal Form 4868 for an automatic federal extension, include a copy with your completed K-40 when you file, and Kansas honors it automatically. An extension buys time to file, not time to pay. Interest accrues on any balance from the original deadline, but if you pay at least 90% of your total liability by April 15, no late-payment penalty applies even if you file later.2Kansas Department of Revenue. 2025 Individual Income Tax Booklet
Penalties for Late Filing or Non-Payment
The late penalty is 1% of the unpaid tax for each month or partial month the return is late, capped at 24%.10KANSAS OFFICE of REVISOR of STATUTES. Kansas Code 79-3228 – Penalties and Interest Interest runs on top of the penalty from the original due date until the balance is paid, at the K.S.A. 79-2968 rate (8% for 2026).9Kansas Department of Revenue. Property Tax Interest Rates for Calendar Year 2026
Fraud is treated differently. A person who fraudulently fails to pay or file owes a penalty equal to the entire unpaid balance plus interest, and faces misdemeanor charges carrying a fine up to $1,000 and 30 days to one year in jail.10KANSAS OFFICE of REVISOR of STATUTES. Kansas Code 79-3228 – Penalties and Interest The fraud penalty replaces the 1%-per-month penalty rather than stacking on it.
Requesting Penalty Abatement
If you missed a deadline for reasons beyond your control, you can file a Petition for Abatement using Form CE-5.11Kansas Department of Revenue. Petition for Abatement Forms The petition must explain the grounds for abatement, include supporting facts, and be notarized. Before the Department will consider it, you must be current on all other filing and payment obligations and not in an open bankruptcy. The Department weighs your ability to pay, income, expenses, and assets. If you can pay the balance through a payment plan, abatement is unlikely.
Military Spouse Exemption
Under the federal Military Spouses Residency Relief Act, the spouse of an active-duty service member stationed in Kansas may be exempt from Kansas tax on wages earned in the state. All three conditions must be met: the service member is in Kansas under military orders, the spouse lives in Kansas solely to be with the service member, and neither spouse claims Kansas as their legal residence. The exemption does not cover the service member’s own Kansas-source income outside of military pay.