Sometimes it’s not a good idea to be at the top of a list. And now that Japan has announced a five-percentage point reduction in its corporate tax rate, the United States will have the dubious honor of imposing the developed world’s highest corporate tax rate. Here’s an excerpt from the report in the New York Times.

Japan will cut its corporate income tax rate by 5 percentage points in a bid to shore up its sluggish economy, Prime Minister Naoto Kan said here Monday evening. Companies have urged the government to lower the country’s effective corporate tax rate — which now stands at 40 percent, around the same rate as that in the United States — to stimulate investment in Japan and to encourage businesses to create more jobs. Lowering the corporate tax burden by 5 percentage points could increase Japan’s gross domestic product by 2.6 percentage points, or 14.4 trillion yen ($172 billion), over the next three years, according to estimates by Japan’s Trade Ministry. … In a survey of nearly 23,000 companies published this month by the credit research firm Teikoku Data Bank, more than 44 percent of respondents cited lower corporate taxes as a prerequisite to stronger economic growth in Japan. … A 5 percentage-point tax rate cut is unlikely to do much to solve Japan’s woes, however. An effective corporate tax rate of 35 percent would still be higher than South Korea’s 24 percent or Germany’s 29 percent, for example. … Meanwhile, the government is trying to offset lost tax revenue with tax increases elsewhere, which could blunt the effect of reduced corporate tax burdens.

I suspect the Japanese government’s estimate of $172 billion of additional output is overly generous. After all, the corporate tax rate in Japan will still be very high (the government originally was considering a bigger cut). And foolish Japanese politicians will probably raise taxes elsewhere. But there will be some additional growth since the corporate tax rate is an especially damaging way to collect revenue.

But I’m not losing sleep about Japan’s economic future. I hope they do well, of course, but my bigger concern is the American economy. The U.S. corporate tax rate of nearly 40 percent (including state corporate burdens) already is far too high, particularly since America adds to the competitive disadvantage of U.S.-domiciled firms by being one of the few nations to impose an extra layer of tax on foreign-source income. Japan’s proposed rate reduction, however, means the high tax rate in America will be an even bigger hindrance to job creation.

It’s also worth noting that the average corporate tax rate in Europe has now dropped to less than 24 percent, so even welfare states have figured out that a high tax burden on business doesn’t make sense in a competitive global economy.

Sometimes you can fall farther behind if you stand still and everyone else moves forward. That’s a good description of what’s happening in the battle for a pro-growth corporate tax system. By doing nothing, America’s self-destructive corporate tax system is becoming, well, even more destructive.