Currently, we don’t support the filing of amended returns with Column Tax. If you need to file an amended return, you’ll need to download your return from Column Tax and file an amended return separately.
If you need to download a copy of your return, return to Column Tax — you should see a screen showing the status of your return. At the bottom of this screen, you’ll see an option to save a copy of your return in PDF format. From there, you may want to consult with a tax professional on how to file an amended return.