Earlier quoted context omitted.
My point is that "The IRS already knows what taxes you owe." is patently false in the vast majority of cases. In 2012 (the last year for which I have a breakdown: https://www.irs.gov/pub/irs-soi/12rswinbulreturnfilings.pdf ), of the 239 million returns filed, about 143 million are individual returns. Of the 143 million individual returns, about 13% or 18.6 million use 1040EZ ( http://www.freeby50.com/2012/12/what-per…
Great analysis. One thing to add though - some of these people have to also file state returns. Which in TurboTax pretty much automatic, but without it it'd be separate return which has to be filed separately - which means same work as for Federal, so people would still need something like TurboTax - unless also each state that has income tax makes their own system too.
I support most systems that would take the burden and aggravation off the American public. I also worry that it would make it even more opaque than it is today. (I don't believe we'd have the current rate of taxation nor spending if we hadn't instituted a payroll withholding scheme and Americans had to actually save and write a check to the government each year.)