Drivers for rideshare companies like Lyft or Uber are considered self-employed and required to report income on a Schedule C come tax time. (Depending on how much they earn, they may be required to pay quarterly estimate taxes.)
A forward-thinking Uber driver would do well to reserve a portion of each paycheck received to go toward taxes (whether they're paid quarterly or annually). They can estimate their taxable income based on how much they plan to drive that year (plus any other income) and use that to ballpark their federal tax bracket.
Is it that simple--that they just reserve 15% (or whatever the bracket happens to be) of each paycheck? What other factors should be considered when estimating the percent of each paycheck to save for taxes?