The Injured Spouse form (Form 8379) can be filed with your return or separately from it. You can access the form in Turbo Tax here:
- Federal Taxes
- Other Tax Situations
- Other Tax Forms
- Miscellaneous Tax Forms
- Report an Injured or Innocent Spouse Claim
You can use a paper version to send to the IRS as well:
https://www.irs.gov/uac/form-8379-injured-spouse-allocation
