Under IRC 6013(d)(3), the tax liability resulting from a joint tax return is “joint and several”. This means that the IRS can look to
collect 100% of the tax due from either spouse. The joint and several liability of a joint tax return does not end when the couple
divorces. This means, if a joint tax return is filed and tax is still owed when after the divorce, both people are still responsible for
that tax. Or, if the joint tax return is audited after the divorce and money is owed, both people will still be jointly and severally
liable for the payment. This is where innocent spouse comes in.
Under IRC 6015, the IRS can grant innocent spouse to a requesting spouse if the requesting spouse meets one of three tests.
If granted, the requesting spouse will be relieved of paying a portion or all of the tax owed.