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Buffett posed a hypothetical situation in which Berkshire Hathaway, which does not currently pay a dividend, paid $1 billion in dividends next year.
Through his 31 percent ownership of the company, Buffett said he would receive an additional $310 million in income that would reduce his tax rate from about 30 percent to 3 percent, while his office secretary would still have a tax rate of about 30 percent.
"The 3 percent overall federal tax rate I would pay -- if a Berkshire dividend were to be tax free -- seems a bit light," Buffett wrote.