"Defaulted" means he didn't pay it. "Turned over to government for collections" may well mean that his tax refund is garnished and applied toward his debt. They don't have to give you warning.

If you mean you haven't filed your taxes yet, I hope you applied for an extension.

If you are serious about filing Chapter 13, you should consult a bankruptcy lawyer and form a strategy in consultation with your lawyer.

Are you stating, in your last question, that liens were perfected before you filed for Chapter 7 protection? Against the marital home? And for reasons we don't know you chose not to include those debts in your original Chapter 7 filing?