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If you did not use TurboTax to file your 2020 tax return, it will be easier to file form 8606 alone. You don’t need a form 1040-X. Just make sure to get the 2020 version of form 8606 and it’s instructions, do an Internet search for “IRS form 8606 for 2020“ and you should locate them. Fill out the form to report your nondeductible IRA contribution, sign and date the form, and mail it to the IRS. (You may have to locate the instructions for form 1040 X to find the address where you should mail the form 8606, unless the address is in the instructions to form 8606 itself.). If 2020 was the first year you made a nondeductible IRA contribution, the form should be fairly easy.
Filing an entire amended return is tricky if you did not originally used TurboTax, and you will have to buy the program. You would start by purchasing a copy of TurboTax deluxe for 2020 to download and install on your own computer, from the list for “products for prior tax years“ at the bottom of this page. Next, create an original tax return exactly as you filed it for 2020 including any errors, and omitting the nondeductible contribution. You will then “file“ this return by telling TurboTax you will file by mail and print a copy. This will mark the tax return as “filed“. Then quit the program, restart, and re-open your tax file, and click “amend“ from the options available. You then add the nondeductible contribution. This should generate a form 8606. TurboTax may tell you that you have nothing to amend, because adding the form 8606 doesn’t actually change the tax you owe or claim a refund. At this point, you will print just a copy of form 8606, which you can do from the forms selection menu. Sign and mail the form 8606.
