>>
>>Still - 6 out of 10 wrong?
>>Can you imagine a developer (houses or programs) who racked up those kind of numbers staying in business?
>
>I didn't read the full article, so my one question is how many were very minor mistakes. I'd had returns come back for very minor mistakes where we're talking about a few dollars. There are also situations where something comes back as a mistake, and further review indicates it was the IRS that made the minor error....but it took months or even longer to straighten things out.

The full article covers some of that.

When you think more about this it's disgraceful.
With the tax software they use now, arithmetic errors and major logic errors are basically impossible to make, so the errors - the article shows that many were to the detriment of the taxpayer, not the IRS - will be in judging what is or isn't deductible- what income should be reported, etc.
That's hardly rocket science.