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If you file a joint return as a qualifying spouse, and your spouse owed back child support, the government may try to reduce your refund by what is owed. 

My sincere condolences for your loss.

You can include a "Request for Injured Spouse" Form 8379 with your return. 

You can get to that form by:

1. Click on "Search" (magnifying glass) at the top right of your screen and
2. Type "injured spouse" in the search bar.  
3. Next click on "Jump to injured spouse" 

Click here for "How Do I File Form 8379, Injured Spouse?"

Click here for additional information on requests for innocent spouse status.