Now I am impressed. That was a very well researched post and I did look at your information very carefully. Let's see what I came up with:

Your source to the census page provided this one:
Because nonemployers account for only about 3.4 percent of business receipts, they are not included in most business statistics, for example, most reports from the Economic Census.
So what does this mean in regards to my original point. I shall clarify now. Two thirds of businesses that employ more than one person do not pay corporate taxes. The point you quoted me on refers only to the employer business and do not take into account all of the self employed people. We can ascertain from your post that the businesses that do employ people are the ones making most of the money, yet are also not paying any corporate taxes. I still don't understand at all how this invalidates my conclusion that the corporate taxes don't affect 2/3 of the businesses that are actually making money and supposed to be paying taxes.

Let's keep going shall we? I am really not sure how you got your math so I will explain how I did mine and you can tell me how you differed. I added the amount of receipts from table 2b for Firms with 2,500 employees or more with the amount of receipts for Firms with 1,500 to 2,499 employees and you get a total for receipts of 11,890,208,735. We know the total number of receipts for all business is 22,832,560,524 so by my math large businesses account for 53% of all business in the marketplace. I can't imagine that you came up with 99% for small business. And this is also going by your assumption of anything less than 1500 employees is considered small business. If we assume anything less than 750 is small, then small business only makes up 44% of all business, but still nowhere even close to your number of 99%

Now that the math is correct, it still doesn't invalidate the original point that you were trying to prove incorrect. 2/3 of all businesses with at least 2 employees don't pay ANY corporate taxes and this includes small and large business.