Hi - I don't think the comment about statute of limitations is correct. I see that you can electronically file an amended return for the previous 3 years, but beyond that, you need to file a paper amended return. From the IRS Amended Return FAQs:
Can I file my amended return electronically? (updated January 5, 2024)
Yes. If you need to amend your Form 1040, 1040-SR, 1040-NR, or 1040-SS/PR for the current or two prior tax periods, you can amend these forms electronically using available tax software products.
What are some reasons that an amended return cannot be filed electronically? (updated January 5, 2024)
Amended returns must be filed by paper for the following reasons:
- Any amended Form 1040, 1040-SR, 1040-NR or 1040-SS/PR returns older than the current or prior two tax periods cannot be amended electronically. Amended returns for those earlier tax years must be filed by paper.
- If amending a prior year return originally filed on paper during the current processing year, then the amended return must also be filed on paper.
See https://www.irs.gov/filing/amended-return-frequently-asked-questions
Also, Turbotax doesn't support beyond 3 previous versions of TT.
