We first look at the number of District taxpayers who have paid self-employment taxes. The data show that the total number of people who pay self-employment taxes has increased in the District from 35,000 in 2006 to nearly 49,000 in 2014. This is a very steep increase (36 percent overall and nearly 4.5 percent annualized) even when compared to the relatively rapid increase in the District’s population and tax filers (tax filers grew at about 2 percent per year during the same period). But data show that the rapid increase in the number of filers who paid self-employment taxes occurred before 2010. In fact, since 2010, the share of tax filers who pay self-employment taxes has been stable at about 14 percent.