NEW YORK (CNNMoney) -- Burger King announced that it has reached a deal to buy Canadian doughnut chain Tim Hortons and base itself in Canada, a controversial transaction that might cut its U.S. tax bill.
The deal could be the latest example of a U.S. company buying a foreign company in order to move its legal home to that of the company it is acquiring, thus allowing it to pay corporate taxes at a lower rate.
Burger King was quick to point out that Canada is where it will have the most outlets once the deal to add Tim Hortons is complete.
Alexandre Behring, executive chairman of Burger King Worldwide, denied that lower tax rates were the motivation behind the deal. He said Burger King already pays a tax rate in the mid- to high-20% range.
"This is largely consistent with Canadian tax rates," he said on a call with stock analysts Tuesday.
But in his prepared remarks he did not say which country would be its home for tax purposes.
Burger King has arranged for $12.5 billion in financing to complete the deal, with $3 billion of that coming from Warren Buffett's Berkshire Hathaway. Berkshire is only providing financing and will have no management role in the combined company.
Public backlash: Mergers with foreign companies aimed at lowering U.S. tax bills -- a known as "inversions" -- have been controversial this year.
Several lawmakers have proposed banning the practice of inversion, and President Obama has denounced the tactic.
At least one other company that bought a foreign rival, drugstore chain Walgreens, will continue to pay corporate taxes as a U.S. company despite its deal to buy European drug store chain Alliance Boots.
Walgreens said it had considered shifting its tax home, but decided the move would not be approved by the Internal Revenue Service. It was also concerned about customer backlash.
On Burger King's Facebook page, there already were calls for consumer boycotts, with thousands of supporters, early Tuesday following the announcement.
"If you attempt to buy Tim Hortons for the purposes of evading US Taxes, I will NEVER step foot in another Burger King again," wrote Gabe Givens, whose Facebook page describes him as a self-employed computer technician.
Another post urged legislation to ban Burger King and other companies that use inversions from U.S. military bases and other government properties.
Top inversion deals: Despite the risk of backlash, several other companies have decided to use mergers to shift their tax home outside of the United States.
Medical device maker Medtronic has announced plans to buy rival Covidien, which is based in Ireland where the tax rate is 12.5%. Chicago drugmaker AbbVie announced a deal with the British company Shire that will slash its effective tax rate in half to 13%. And U.S. drugmaker Pfizer tried to buy British pharmaceutical maker AstraZeneca, but was rebuffed in that effort.
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