If you file Form 4868 with the Internal Revenue Service requesting an automatic extension of time to file your federal tax return, you will automatically receive an extension of time to file your Kansas return. A copy of form 4868 must be enclosed with your Kansas income tax return when filed. This is not an extension of time to pay.
To make an extension payment on your Kansas income tax, use the Kansas Payment Voucher (K-40V). Check the box on the voucher for extension payment. The extension payment must be postmarked on or before April 15.
Any balance due remaining after April 15 will accrue interest. To avoid a separate penalty charge, 90% of your tax must be paid by April 15 and the return filed and any remaining balance due paid within the extended due date.
If any due date falls on a Saturday, Sunday, or legal holiday, substitute the next regular workday.