Editorial in today’s Wall Street Journal:  Their Fair Share:

Washington is teeing up "the rich" for a big tax hike next year, as a way to make them "pay their fair share." Well, the latest IRS data have arrived on who paid what share of income taxes in 2006, and it’s going to be hard for the rich to pay any more than they already do. The data show that the 2003 Bush tax cuts caused what may be the biggest increase in tax payments by the rich in American history.

The nearby chart shows that the top 1% of taxpayers, those who earn above $388,806, paid 40% of all income taxes in 2006, the highest share in at least 40 years. …

Aha, we are told: The rich paid more taxes because they made a greater share of the money. That is true. The top 1% earned 22% of all reported income. But they also paid a share of taxes not far from double their share of income. In other words, the tax code is already steeply progressive. …

If Mr. Obama does succeed in raising tax rates on the rich, we’d also wager that the rich share of tax payments would fall. The last time tax rates were as high as the Senator wants them — the Carter years — the rich paid only 19% of all income taxes, half of the 40% share they pay today. Why? Because they either worked less, earned less, or they found ways to shelter income from taxes so it was never reported to the IRS as income.

The way to soak the rich is with low tax rates, and last week’s IRS data provide more powerful validation of that proposition.