The financial industry has ramped up pressure on government officials to scale back the rule, which is set to be implemented in July.

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The rule designed to even the playing field by putting Buffett's taxes on Bosanek's scale isn't called the Bosanek Rule or the Secretaries' Rule.

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The final rule settles on the higher end of the scale, 12%, and uses a 10-year amortization schedule.

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