Kansas State Tax Extension
Kansas Personal Tax ExtensionForm K-40V
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File Your Tax Return Now →Kansas Personal Income Tax Extension – Federal Extension Required
Kansas mirrors the federal extension system. Taxpayers who obtain a federal extension by filing IRS Form 4868 automatically receive a six-month extension to file their Kansas personal income tax return – pushing the deadline from April 15, 2026, to October 15, 2026. No separate Kansas extension application is required. Payment, however, remains due April 15.
Include Your Federal Extension When You File
Kansas requires a copy of IRS Form 4868 to be attached to your state return when you file. Missing it can cause processing issues even with a valid extension on record.
Pay Any Balance by April 15, 2026
Kansas extends the filing deadline, not the payment deadline. Any Kansas income tax owed must be paid by April 15 to avoid penalties and interest.
Using Form K-40V
Form K-40V (Individual Income Tax Payment Voucher) is used when mailing a payment. If paying online through the Kansas Department of Revenue’s portal, the form is not required separately.
Late Filing and Payment Penalties
Kansas imposes a 1% monthly penalty on unpaid tax for both failure to file and failure to pay, each capped at 24%. Both penalties can run simultaneously, so timely filing and payment are especially important.
Best Practices
- ✓File IRS Form 4868 by April 15 – Kansas’s extension depends on it.
- ✓Pay any Kansas balance by April 15, 2026, using ksrevenue.org or Form K-40V by mail.
- ✓Attach a copy of Form 4868 when you file your Kansas return by October 15.
- ✓Use the Kansas Department of Revenue’s online portal at ksrevenue.org for ACH payments.
Kansas’s extension is automatic with a federal extension in hand. Pay by April 15, attach your Form 4868 at filing, and submit your Kansas return by October 15, 2026.
Quick Reference Table
| Item | Details |
|---|---|
| State Abbreviation | KS |
| Extension Status | Federal Required |
| Return Due Date | April 15, 2026 |
| Extended Due Date | October 15, 2026 |
| Online Payment | Kansas | Online Tax Extension Payment |
| Payment Voucher | Form K-40V | Individual Income Tax Payment Voucher |
| State Payment Agency | Kansas Department of Revenue |
| Failure to File Penalty | 1% of unpaid tax per month, up to 24% |
| Failure to Pay Penalty | 1% of unpaid tax per month, up to 24% |
Extended? Your Kansas Return Deadline Is Coming Up.
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File My Return Securely →Kansas Extension Payment Options
Any Kansas income tax owed is due by April 15, 2026. Two online payment options are available through the Kansas Department of Revenue.
Pay Online – No Fee
Go to ksrevenue.org and use the Customer Service Center for a direct ACH transaction from your bank account. No fee.
Pay by Credit Card
Visit ksrevenue.org/eservices.html for a list of authorized third-party vendors. A convenience fee applies.
Mailing Address with Payment
Kansas Department of Revenue
P.O. Box 750260
Topeka, KS 66699-0260
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