An extension to file is not an extension to pay tax.
Kansas automatically honors a federal extension for individual income tax - a copy of federal Form 4868 must be enclosed with the Kansas return when it is filed, but no separate Kansas extension application is needed. At least 90% of the tax due must still be paid by the original due date to avoid penalty.
| Item | Detail |
|---|---|
| Form required | No separate Kansas form; attach a copy of federal Form 4868 to the Kansas return when filed |
| Extension length | Matches the federal extended due date, to October 15, 2026 |
| Payment threshold | At least 90% of the tax due must be paid, postmarked by the original April 15 due date, to avoid penalty; the remaining balance is due by the extended filing date |
| Authority | K.S.A. §79-3221 (as amended for tax years after December 31, 2019, to align with the federal extension) |