TurboTax will walk you through preparing the 1040X if you filed your original return through TurboTax; see instruction link below.
How do I amend my federal tax return for this year? If it is for a prior year return, see below.
How do I amend my federal tax return for a prior year?
If you did not use TurboTax, you can use the IRS instructions for Form 1040-X. Instructions for Form 1040-X (Print version PDF)
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