TurboTax online can only prepare the current season. When you go to amend a 2018 online tax return, you will be prompted to download a free copy of TurboTax to install on your desktop. You will also need to download your 2018 tax data file. After opening the data file in the 2018 program you will select amend from the list of things you can do on the first page. Follow the instructions carefully. Robert has previously posted an instruction on how to manually insert the IRC 1341 credit. Even using TurboTax software, amended returns can’t be e-filed, so you will still expect at the end to print, sign, and mail the 1040 X and new schedule 3.
