Can we amend tax return documents after finalizing it? I have not sent them to IRS. I try to amend it, but I was not allowed to do it for now.

[DoninGA]

You do NOT amend at tax return that has not been filed.  You just add, change or delete any of the information before filing.

To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state. 

This will take you back to the 2025 online tax return where you can make any changes.

[hase-coichi]

Thank you for your advice. I tried that way just after I finished the process, but I found out I wasn't allowed to do it. But now it looks like working. Thanks again!