

Almost nine years ago, Bristol Myers Squibb filed paperwork in Ireland to create a new offshore subsidiary. By moving Bristol Myers’s profits through the subsidiary, the American drugmaker could substantially reduce its U.S. tax bill.
Years later, the Internal Revenue Service got wind of the arrangement, which it condemned as an “abusive” tax shelter. The move by Bristol Myers, the I.R.S. concluded, would cheat the United States out of about $1.4 billion in taxes.
That is a lot of money, even for a large company like Bristol Myers. But the dispute remained secret. The company, which denies wrongdoing, didn’t tell its investors that the U.S. government was claiming more than $1 billion in unpaid taxes. The I.R.S. didn’t make any public filings about it.
And then, ever so briefly last spring, the dispute became public. It was an accident, and almost no one noticed. The episode provided a fleeting glimpse into something that is common but rarely seen up close: how multinational companies, with the help of elite law and accounting firms and with only belated scrutiny from the I.R.S., dodge billions of dollars in taxes.
infrastructure plan that the White House unveiled on Wednesday proposed increasing the minimum overseas tax on multinational corporations, which would reduce the appeal of such arrangements.)
For the three years leading up to 2012, Bristol Myers’s tax rate was about 24 percent. The U.S. corporate income tax rate at the time was 35 percent. (It is now 21 percent.)
The company wanted to pay even less.
In 2012, it turned to PwC, the accounting, consulting and advisory firm, and a major law firm, White & Case, for help getting an elaborate tax-avoidance strategy off the ground. PwC had previously been Bristol Myers’s auditor, but it was dismissed in 2006 after an accounting scandal forced Bristol Myers to pay $150 million to the U.S. government. Now PwC, with a long history of setting up Irish tax shelters for multinational companies, returned to Bristol Myers’s good graces.
sided with the agency after it challenged a similar maneuver by General Electric using an offshore subsidiary called Castle Harbour. The I.R.S. also contested comparable setups by Merck and Dow Chemical.
The Bristol Myers arrangement “appears to be essentially a copycat shelter,” said Karen Burke, a tax law professor at the University of Florida. Since the I.R.S. was already fighting similar high-profile transactions, she said, “Bristol Myers’s behavior seems particularly aggressive and risky.”
The next January, the company announced its 2012 results. Its tax rate had plunged from nearly 25 percent in 2011 to negative 7 percent.
On a call with investors, executives fielded repeated questions about the drop in its tax rate. “Presumably, all drug companies try to optimize their legal entities to take their tax rate as low as they can, yet your rate is markedly lower than any of the other companies,” said Tim Anderson, an analyst at Sanford C. Bernstein & Company. “So I’m wondering why your tax rate might be unique in that regard?”
Charlie Bancroft, the company’s chief financial officer, wouldn’t say.
The more than $1 billion in tax savings came at an opportune moment: Bristol Myers was in the midst of repurchasing $6 billion worth of its own shares, an effort to lift its stock price. By January 2013, it had spent $4.2 billion. The cash freed up by the tax maneuver was enough to cover most of the remainder.