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@asha-styles-86 

 

for the years that you filed JOINT, you are liable for any unpaid taxes from those years (unless you filed "injured spouse")

 

for the years you filed SINGLE, you are not liable for HIS taxes for those years. 

 

I suspect the IRS will not care about your divorce papers.  It would be up to you to get any money back from your ex that the IRS withheld.