The year 1913 marked the first time a Big Oil subsidy was written into the tax code. The Revenue Act of 1913 allowed oil companies to write off 5 percent of the costs from oil and gas wells beginning March 1 of that year. (For reference, see pages 172-174 of the Act.) A century later, oil companies can now deduct three times this rate, at 15 percent, although the very largest companies no longer qualify. The percentage depletion subsidy also increases when prices are high, at the same time that oil companies enjoy greater profit. It can even eliminate all federal taxes for independent producers.

A Center for American Progress report estimated that closing this tax break would save $11.2 billion over 10 years.

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