Straight from the IRS: "...each of us is responsible for filing a tax return when required, and for determining and paying the correct amount of tax. Fortunately, the vast majority of Americans recognize their legal responsibility, and properly report and pay over their tax obligations."
But the are many who do not live up to their obligations.
Below are some of the schemes used to violate tax laws:

Some of the common scams the IRS sees include:

  • The "Dirty Dozen" — 12 Common Scams (IR-2006-25)
  • Employment Tax Schemes (IR-2004-47)
  • Misuse of "Corporation Sole" Laws for Religious Organizations (IR 2004-42)
  • Offering to Help Obtain Tax Benefits — targets have included military families (IR-2003-63)
  • Schemes involving Medical Professionals — FS-2004-115 and FS-2003-12
  • Schemes Promoting Use of Disabled Access Credit (IR-2002-17)
  • Home-Based Business Tax Avoidance Schemes (IR-2002-13)
  • Slavery Reparation Scams (IR-2002-08) and court cases involving such scams (FS-2002-08)
  • Deliberately underreporting or omitting income,
  • Overstating the amount of deductions
  • Keeping two sets of books
  • Making false entries in books and records
  • Claiming personal expenses as business expenses
  • Claiming false deductions
  • Hiding or transferring assets or income

For more information go to: IRS Compliance/Enforcement

Think about it. We all need to pay our fair share. Our taxes fund a myriad of programs that benefit each of us in some way. And, if enough get by without paying, then the rest of us will end up paying more.