You can't fix it after you've already e-filed. However, the IRS should reject your return (they definitely check to see if your SS#s are correct). Once rejected, simply log back into your return and make the correction (and refile).
If by some chance your return gets accepted, you will have to amend your return using Form 1040-X (not available until about mid-February).
Form 1040X can't be e-filed per IRS regulations.
After you finish amending in TurboTax, we'll guide you through printing and mailing your 1040X along with any required attachments.
Three weeks after mailing your amendment, you can start tracking it at Where's My Amended Return? on IRS.gov.
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