The Internal Revenue Service has announced that it has now passed the one billion mark for individual tax returns processed through its electronic filing (or e-filing) program.

FORBES: One Billion Served: IRS Hits Milestone

Intuit had also temporarily derailed a free file program in California and killed a simple online filing system in Virginia.

FORBES: The Tax Complexity Lobby

"Without the incentives, I probably wouldn't have purchased a brand new vehicle, " Callahan, who runs a science outreach program at the University of Utah, told CNN after filing her iReport.

CNN: 'Cash for clunkers' buyers agree: Credit came at perfect time

Other arguments against I-File: States that have used free filing systems have had a relatively low usage rate--a federally run program could make auditing easier (and more likely) and it wouldn't necessarily encourage taxpayers to take all deductions possible.

FORBES: Magazine Article