This year more than three-fourths of all individual tax returns will be filed electronically, and a growing number will come from people who used tax-preparation software. As modern and efficient as this is, the law has not caught up. Taxpayers who employ an accountant or other preparer have some protection from daunting penalties if the IRS finds mistakes. Software users who prepare their returns without help have little or no protection.
The most famous software fiasco had a very atypical ending. During the confirmation hearings of Treasury Secretary Timothy Geithner three years ago, we learned that he failed to pay self-employment tax on income from the International Monetary Fund. Mr. Geithner partially blamed the oversight on the TurboTax software he had used, claiming it wasn't formatted "in a way that caught" his embarrassing mistake....