When mailing a TurboTax amended return (Form 1040-X) for a previous year, include the signed Form 1040-X, any new/updated schedules (e.g., Schedule A, B, C) that changed, and copies of any new tax forms (like W-2s or 1099s) that support the changes; however, you don't need to include the original return with the 1040-X. See this IRS webpage for more information.
To complete a Form 1040-X, you'll need the following information:
- a copy of the original tax return that's being amended
- W-2s
- schedules
- worksheets
- corrected information and calculations
- any forms needed to support corrections
See this tax tips article for more information about filing an amended return with IRS.
If the changes affect a state return, it should also be amended. See this TurboTax help article for more information.
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