Kansas Income Tax Filing Deadlines by Tax Year The majority of deadlines listed here are for Tax Year 2024. Some apply to upcoming Tax Years and some are IRS or Federal deadlines. Deadline Type Description April 15, 2025 Income Tax Return Prepare and eFile an IRS (Due Date April 15, 2025) and Kansas State Income Tax Return (Due Date April 15, 2025) until October 15, 2025. - eFileIT April 15, 2025 Income Tax Extension Kansas Income Tax Extension Details. October 15, 2025 Income Tax Return after the April 15, 2025 Kansas Tax Extension Last day to eFile a 2024 Kansas State Income Tax Return for Tax Extension Filers and late eFilers. You can only eFile (to file by paper see below) Kansas Income Tax Return together with an IRS Tax Return. eFileIT October 15, 2025via mail-in Forms. Forms incl. Mailing Address are listed below. Income Tax Return after the April 15, 2025 Kansas Tax Extension Deadline for taxpayers who got an KS Tax Extension to file their Kansas Income Tax Return by mail-in Forms - the Forms incl. mailing addresses are listed below - is Oct. 15, 2025. (Optionally, the eFileIT deadline is Oct. 15, 2025). Instructions on how to only - without the IRS return - prepare and file a Kansas State Income Tax Return on eFile.com. Complete and Mail In Now Tax Amendment for all Tax Years Detailed Instructions on how to prepare and mail in an Kansas State Income Tax Return Amendment. 2024, 2025, etc. Other State Tax Returns Extensions Amendment Deadlines Select respective State Tax Return Deadlines. 2024, 2025, etc. IRS Federal Income Tax Returns, Amendment, Extension Deadlines 2024, 2025 Tax Year Income Tax Return Deadlines. April 15, 2028 2024 Kansas Income Tax Return Refund The last day to file and claim your 2024 Kansas Income Tax Return. This deadline does not apply if you owe 2024 Income Taxes. TurboTax® is a registered trademark of Intuit, Inc. H&R Block® is a registered trademark of HRB Innovations, Inc.