It should work according to this Intuit TurboTax Article @ https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/e-file-1040x-amend-return/L9t...
Can I e-file my federal Form 1040-X amended return?
by TurboTax • 5758
Updated January 14, 2026 9:34 AM
Generally, you can e-file your amended 2025, 2024, or 2023 federal return via TurboTax if your original return was also e-filed in TurboTax...
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2024 Turbotax Windows desktop application does allow e-file of an amended 2024 tax return. Select continue on the E-Filing is closed for the season page.
However, it is rejected by the IRS after transmittal with "IND-689-01 - The year of the 'PrimarySignatureDt' in the Return Header must be equal to the processing year."
I'm not sure why, but Turbotax requires the use of a signature date of 01/01/2025 through 12/31/2025 on the Correct Your Signature Date page. The return can not be transmitted return if not.
I strongly suspect that is what is causing the rejection of the amended 2024 tax return being e-filed in 2026.
I attempted to report this as a coding error since the above article posted by Turbotax this year indicates it is supported. I was told that it is not supported and that mailing is the only way to file an amended 2024 return. I asked repeatedly how I could identify a possible coding error. They suggested the Intuit community.
It may be poor training of the support team. It may be intentional to limit e-filing to a single year. Either way it is a shame that it does not work!
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