Tax evasion in the United States unlawful gains as income when filing annual tax returns (see e.g., "James v. United States") although such income is typically not reported. Suspected lawbreakers, most famously Al Capone, have been successfully prosecuted for tax evasion when there was insufficient evidence to try them for their non-tax related crimes. Reporting illegal income as earned legitimately may be illegal money laundering. In the United States, the IRS estimate of the 2001 tax gap was $345 billion. For 2006, the tax gap is estimated to be $450 billion. A more recent study estimates the 2008 tax gap in the range of $450 to
Tax evasion risk of evasion by the taxpayers. It has been suggested that tax farming may reduce tax evasion in less developed countries. This system may be liable to abuse by the "tax-farmers" seeking to make a profit, if they are not subject to political constraints. Abuses by tax farmers (together with a tax system that exempted the aristocracy) were a primary reason for the French Revolution that toppled Louis XVI. Pre-shipment inspection agencies like Société Générale De Surveillance S. A. and its subsidiary Cotecna are in business to prevent evasion of customs duty through under-invoicing and misdeclaration. However, PSI agencies have