You’re in luck! The IRS has provisions for an “Innocent Spouse”.
You Are NOT Responsible for the Misdeeds of Your Spouse… If You Know What Steps to Take.
“Innocent Spouse Relief provides you relief from additional tax you owe if your spouse or former spouse failed to report income, reported income improperly or claimed improper deductions or credits.” – IRS Topic 205
Under certain circumstances, you may be resolved of any misdeeds of a spouse or former spouse involving income tax fraud.
Most married couples file their tax returns jointly. There are certainly benefits to this, but if there were certain “errors” or “mistakes” on your joint return and it was your (present or former) spouse’s fault, you could be in luck. There are provisions in the Tax code that will let you out of a tax burden that was not your fault. But, it will need to be proven.
To ensure yourself the best possible outcome, it is best to take action as soon as you realize there is a problem.