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Misc > Deductions/Credits > Injured Spouse Information (Form 8379)
If you are married and want to file
Form 8379 with your tax return, enter the Injured Spouse information on the
Injured Spouse Information (Form 8379) screen.
If you've already filed your tax return, you can still file
Form 8379. In that case, download
Form 8379 from the IRS website to fill out and mail in separate from the tax return already filed.