it's not so much how much it is off but that it's off at all. If the numbers don't add up then they don't add up. If there's any kind of difference then it has to be found and accounted for and it becomes a needle in a haystack search to account for the difference. Think about trying to find $0.05 spread across hundreds of thousands of transactions due to rounding issues.
Every single publicly listed company, every single one of them, is off when it comes to calculating their taxes by way more than just a dollar. And I don't mean clever accounting tricks or tax avoidance schemes, I just mean in terms of actual mistakes being made.
