When JPMorgan Chase CEO Jamie Dimon testified in the U.S. House today, he presented himself as a champion of free-market capitalism in opposition to an overweening government. His position would be more convincing if his bank weren't such a beneficiary of corporate welfare. JPMorgan receives a government subsidy worth about $14 billion a year, according to research published by the International Monetary Fund. The money helps the bank pay big salaries and bonuses. More important, it distorts markets, fueling crises such as the recent subprime-lending disaster and the sovereign-debt debacle that is now threatening to destroy the euro and sink the global economy. In recent decades, governments and central banks around the world have developed a consistent pattern of behavior when trouble strikes banks that are large or interconnected enough to threaten the broader economy: They step in to ensure that all the bank's creditors, not just depositors, are paid in full. With each new banking crisis, the value of the implicit subsidy grows. JPMorgan's share of the subsidy is $14 billion a year, or about 77% of its net income for the past four quarters. In other words, U.S. taxpayers helped foot the bill for the multibillion-dollar trading loss that is the focus of today's hearing. When Dimon pushes back against capital requirements or the Volcker rule, it's worth remembering that he's pushing for a form of corporate welfare that, left unchecked, could lead to a crisis too big for the government to contain.