Yes, you can file form 8379 along with your original tax return or you can file it by itself after you are notified of an offset.
If you are filing Form 8379 by itself, it must show both spouses' social security numbers in the same order as they appeared on your income tax return. You, the "injured" spouse, must sign the form.
To get a copy of form 8379:
https://www.irs.gov/pub/irs-pdf/f8379.pdfFor more information:
https://www.irs.gov/uac/seven-facts-about-injured-spouse-relief
