[twblalock]

Unless using TurboTax actually saves people money. I wouldn't expect the IRS to have enough information to be able to predict in advance the deductions people might be able to take -- stuff like business expenses, mortgage interest, charitable donations, state taxes, etc.

Tax evasion and overstating deductions are common partly because the IRS doesn't have access to the information necessary to verify everything -- that's the same information the IRS would need in order to pre-fill tax forms accurately for the 1/3 of taxpayers who itemize their deductions. 1/3 of American taxpayers a pretty big market for TurboTax and similar services to thrive in.