You have until April 15 to file an amended return for 2018 and still receive a refund. The IRS will not pay refunds on amended returns over 3 years old. You can amend 2019 and 2020 for a full refund as well. In order to file an amended return, you must use the software for that year. Amended returns other than this year must be mailed in. I suggest tracking for the safety of your information and proof of mailing. Please follow these steps:
In addition, you may need to file a state return.
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