The U.S. federal tax code has become increasingly complex over the last 100 years, and with that change has come the need for more people who understand it.
A new graphic from "Face the Facts USA," a non-partisan election research project based at George Washington University, shows that the federal tax law has grown from just 400 pages in 1913, to more than 72,000 pages today.
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To wade through that document, the U.S. employs some 1.2 million tax preparers. Face the Facts points out that that number is higher than the number of firefighters (310,400) and police (765,000) in the country combined.
The project also warns that many Americans fear auditing because they live in a "taxation system so complex they can't hope to understand it."