...President Bush and House Speaker Dennis Hastert (search) have both said the idea of a national sales tax deserves a serious look. For many, the idea of a world without the Internal Revenue Service is very seductive. "We spend about $400 billion a year complying with the tax code. We spend $200 billion a year just filling out IRS paperwork," said Rep. John Linder (search) , R-Ga., who has proposed a bill that would create a national sales tax. Proponents have spent millions on research and have concluded that a national sales tax can replace the income tax, payroll tax,...