As of today, the Form 1040-X is available to use. See forms availability : Forms
You only need to file an amendment if the changes creates a difference in your total refund and tax due. If the result remains the same, you do not need to submit 1040-X.
Also, be aware that the IRS limits the amount of time you have to file an amended return to claim a refund to:
- Within three years from the original filing deadline, or
- Within two years of paying the tax due for that year, if that date is later.
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