How much do we owe IRS ?

An US Internal Revenue Service (IRS) study last year concluded that government collected only 86% of the tax it was owed in 2001. The tax gap (between what taxpayers owe and what they pay) in 2001 was $345 billion. This translate to $2,680 unpaid taxes per US household. Of that, "$197 billion came from underreporting on individual income tax returns and $88 billion from underreporting by corporations and the self-employed. The rest came from those not filing or not paying the proper amount".