Only the top 3%?

From the WSJ: Kevin A. Hassett and Alan D. Viard: The Small Business Tax Hike and the 97% Fallacy

...the president and his supporters have repeatedly asserted that the expiration of these cuts will have little impact, because they affect only a tiny fraction of the wealthiest Americans, people who "can afford it."
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The impact is far more severe than Mrs. Pelosi and Mr. Biden suggest. In fact, the sound bite about 3% of small businesses, which has been picked up by numerous pundits, is one of the more misleading statements in the long history of economic propaganda.

The 3% figure, which is computed from IRS data, is based on simply counting the number of returns with any pass-through business income. So, if somebody makes a little money selling products on eBay and reports that income on Schedule C of their tax return, they are counted as a small business. The fact that there are millions of people in the lower tax brackets with small amounts of business income may be interesting for some purposes, but it is irrelevant for the assessment of the economic impact of the tax hikes.

The numbers are clear. According to IRS data, fully 48% of the net income of sole proprietorships, partnerships, and S corporations reported on tax returns went to households with incomes above $200,000 in 2007. That's the number to look at, not the 3%. Would Mrs. Pelosi and Mr. Biden deny that the more successful firms owned by individuals in the top income-tax bracket are disproportionately responsible for investment and job creation?
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... will the higher rates actually cause a significant reduction in business activity?

Economic research supports a large impact. A pair of papers by economists Robert Carroll, Douglas Holtz-Eakin, Harvey Rosen and Mark Rider that were published in 1998 and 2000 by the National Bureau of Economic Research analyzed tax return data and uncovered high responsiveness of sole proprietors' business activity to tax rates. Their estimates imply that increasing the top rate to 40.8% from 35% (an official rate of 39.6% plus another 1.2 percentage points from the restoration of a stealth provision that phases out deductions), as in Mr. Obama's plan, would reduce gross receipts by more than 7% for sole proprietors subject to the higher rate.