How do I Amend a Kansas State Return?

If you need to make changes to a Kansas return that has already been accepted, you'll need to file an amended Kansas return. Whether you're correcting income, deductions, credits, or updating information after a change to your federal return, our software can help you prepare the amendment.

Kansas requires taxpayers to paper file amended individual income tax returns. The Kansas Department of Revenue also requires an explanation of the changes made to the return. 

How Do I Create an Amended Kansas Return?

To generate your amended Kansas return in the software:

1. Select 2025 Amended Return from the navigation menu.
2. Pay for your amended return.
3. Review the Filing an Amended Return page and select Continue.
4. Choose Amend State Return(s).
5. Select Amended State within the white box.
6. Scroll to the bottom of the Kansas return menu and select Amended Return.
7. Answer Yes to the question: "Would you like to mark this return as an amended return?"
8. Complete the remaining applicable sections.

Kansas Form K-40 includes a specific amended return section where taxpayers indicate the reason for amending the return, such as a Kansas-only change, an amended federal return, or an IRS adjustment.

What If I Received a Refund From My Original Kansas Return?

If you received a refund from your originally filed Kansas return, you must enter that amount on your amended return so the amended calculations are accurate.

To enter the refund amount:

1. Navigate to the Amended Return section using the steps above.
2. If you've already started the amendment, select Edit Amended.
3. Select Amended Return from the Kansas return menu.
4. Enter the refund you received in the field labeled "Enter the Original Refund Received."

Kansas Form K-40 specifically requires the overpayment from the original return to be reported when filing an amended return. 

What If I Paid Tax With My Original Kansas Return?

If you made a payment when you filed your original Kansas return, be sure to include that amount on the amended return.

To report the payment:

1. Return to the Amended Return section.
2. Select Edit Amended if necessary.
3. Choose Amended Return from the Kansas menu.
4. Enter the amount paid with the original return in the field labeled "Enter the amount paid, if any, with your original return."

Kansas Form K-40 includes a line for payments remitted with the original return when filing an amendment. 

How Do I File an Amended Kansas Return?

Kansas amended individual income tax returns must be filed by mail. 

To print your amended return:

1. Select Summary/Print from the navigation menu.
2. Choose View Return from the Tax Return Summary page.
3. Review your PDF.
4. Print, sign, and mail the amended return to the appropriate Kansas mailing address.

Only mail:

• The amended Kansas return
• Copies of supporting documents that explain the change (such as W-2s, 1099s, or other relevant records)

You generally do not need to mail a copy of the originally filed return unless the IRS or Kansas specifically requests it. Comparing your original and amended PDFs can help you verify the changes before mailing.

The correct mailing address will appear on the printed amended return and may vary depending on whether you're requesting a refund or submitting a payment.

Important Information About Kansas Amended Returns

When filing an amended Kansas return:

• You must provide an explanation of the changes made to the return. 
• If your federal return was amended using Form 1040-X, Kansas requires a copy of the federal amendment and an explanation of the changes.
• If Schedule S was included with your original Kansas return, it must also be included with the amended return, even if no changes were made to that schedule. 
• If the amendment results in a refund, Kansas generally requires the amended return to be filed within three years of the original filing date (including extensions) or within two years of the date the tax was paid, whichever is later. 

Additional Kansas Resources

For detailed state guidance, see the Kansas State Instructions 2026.pdf.