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I am sorry to learn about this situation. The IRS does provide "innocent spouse relief" (see: https://www.irs.gov/taxtopics/tc205.html), but I highly recommend that you retain a local attorney to assist you with this matter (appearing and defending yourself in tax court is not as daunting as most general civil cases, but it is quite important to do so aggressively from the beginning). You can find local attorneys using the State and local Bar Association directories, or private directories such as www.AVVO.com; www.FindLaw.com; or www.Martindale.com (I personally find www.AVVO.com to be the most user friendly).