Everything you need to know about Form K-40

What is Form K-40?

Form K-40 is the Kansas Individual Income Tax Return — the primary state filing for Kansas residents, nonresidents who earned Kansas-source income, and part-year residents who lived in Kansas for part of the tax year. It's filed annually with the Kansas Department of Revenue.

Who should file Form K-40?

You file K-40 if you were a Kansas resident at any point in the tax year and meet Kansas's filing thresholds, or if you're a nonresident who earned wages, business income, rental income, or other taxable income sourced from Kansas. Filing status, age, and gross income determine whether you must file.

What you'll need to complete it?

Have your federal Form 1040 ready since K-40 starts from federal adjusted gross income. You'll also need W-2s and 1099s, documentation for Kansas-specific additions and subtractions (like U.S. government interest, retirement contributions, or qualified Section 529 contributions), and records for any credits you claim — the Food Sales Tax Credit, Earned Income Credit, Child and Dependent Care Credit, and others.

When and how to file?

Form K-40 is due April 15, or the next business day if it falls on a weekend or holiday. File electronically through Kansas WebFile or a tax preparer, or mail the completed return to the Kansas Department of Revenue using the address printed in the K-40 instructions. Keep a signed copy and all supporting schedules for your records.