1: The number of pages of instruction for the first 1040 tax form in 1913. Today, the form itself is one page shorter - but comes with 92 pages of instruction. $3,000: The income threshold for filing taxes in 1913 (that's $65,000 in today's dollars, adjusted for inflation). The top tax rate was 7 percent and applied only to those who made more than $500,000 a year (almost $11 million in today's inflation-adjusted dollars). 358,000: The number of returns filed in 1913 out of a population of 97 million. In 2006, a total of 135 million returns were filed out of a population of 300 million.
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