Agree that some unsecured income tax debts can be discharged in bankruptcy if a timely non-fraudulent return was filed. (usually taxes that were due more than 3 yrs. before bk filing). However; if there were years where no returns were filed, there is nothing that can be discharged in bk for those years. (full amt. due unless a compromise can be reached)
I would talk to an attorney if at all possible or at least the IRS to see what can be worked out in the way of a payment plan.

