The Walgreen Co. drugstore chain started nearly a century ago in Dixon, Ill., before moving its corporate headquarters to Chicago and eventually to Deerfield, Ill.

Next stop? Could be Bern, Switzerland.

A group of shareholders reportedly is pressuring the giant retail chain for a move. The reason: lower taxes. Much lower taxes.

If Walgreen changes its legal domicile to Switzerland, where it recently acquired a stake in European drugstore chain Alliance Boots, the company could save big bucks on its corporate income-tax bill. The effective U.S. income-tax rate for Walgreen, according to analysts at Swiss Bank UBS: 37 percent. For Alliance Boots: about 20 percent.

We hope Walgreen doesn’t relocate. Would company executives be smart to do so in order to best serve their shareholders? Hmm. We’d rather not say. So we’ll respond to that question with another, broader but similarly urgent question:

How many companies have to turn refugee before Congress and the White House stop their bipartisan talking — but only talking — about the need to reform the federal tax code in general, and the corporate income tax in particular?

Nearly 30 years after the last significant reform, the U.S. tax code is a mess. Both political parties agree that corporate income-tax rates, among the highest in the world, need to be reduced. Practically every other advanced country has taken the step. That has left the U.S. as a conspicuous outlier, with a relatively competitive business-tax burden overall — except for the excessive income-tax rate.

President Barack Obama has said repeatedly that he supports business-tax reform in principle. In his State of the Union address in January, the president said both parties should work together to overhaul a tax regime “riddled with wasteful, complicated loopholes that punish businesses investing here, and reward companies that keep profits abroad.”

In February, House Ways and Means Chairman Dave Camp, R-Mich., proposed a plan for comprehensive tax reform that included slashing the corporate tax rate to 25 percent.

Yet House and Senate leaders won’t take up controversial tax reform in an election year. They simply won’t budge. If only the same could be said for corporate America. As more companies relocate their headquarters for tax purposes, shareholder pressure mounts for others to do the same.

We’ve seen a series of transactions by drugmakers structured to take advantage of Ireland’s low corporate tax rates: Horizon follows Actavis and Perrigo to the Emerald Isle. Horizon estimates that the company’s tax rate will drop into the low-20s percentage range or less, down from the high-30s percentage range in the United States.

But this isn’t just a gambit for pharmaceutical companies. Shareholders of insurance industry behemoth Aon Corp. in March 2012 approved that company’s HQ move to London from Chicago — a move that, yes, lowered Aon’s tax burden.

Walgreen differs from Aon, Horizon and other business-to-business companies because it deals directly with the public. The drugstore chain wants to avoid provoking a backlash from its customers if it is perceived as shirking its responsibilities to the United States. Not long ago, computer giant Apple endured a spate of criticism amid reports about its efforts to reduce its U.S. corporate taxes.

The Financial Times, which reported on the Walgreen discussion about a headquarters move, noted that the retailer is concerned about “political risks.” That’s understandable, and paradoxical:

If Walgreen moves its headquarters for tax reasons, some of the loudest howls of criticism will come from the very politicians who haven’t fixed our corporate tax code. Remember, you can lead a long life without hearing a president or a member of Congress utter these two sentences: We have only ourselves to blame. If we had offered more than lip service, this wouldn’t have happened.

But if “political risk” truly is what’s keeping an Illinois business icon from relocating, Congress and the president had better not wait until after the November election to plan serious tax reforms.