NerdWallet's ratings for brokers and robo-advisors are weighted averages of several categories, including investment selection, customer support, account fees, account minimum, trading costs and more. Our survey of brokers and robo-advisors includes the largest U.S. providers by assets under management, plus notable and/or emerging players in the industry. Factors we consider, depending on the category, include advisory fees, branch access, user-facing technology, customer service and mobile features. The stars represent ratings from poor (one star) to excellent (five stars). Ratings are rounded to the nearest half-star.
Hiring human brokers to make phone calls and sell clients on investing is costly. Because discount brokers avoid this cost, they can pass on the advantage to customers in the form of lower commissions. A simple rule in the financial world is that clients pay the brokers' expenses, so the lower the brokers' expenses, the lower the fees and commissions.