Scottrade: For arguably the most full featured of all the online discount brokers, Scottrade offers a rising rate based on the amount of cash you have in your account. At the low end, Scottrade pays just 0.05% for balances under $5,000. The rate increases to a high of 1.00% for balances of $1 million or greater. Perhaps not the best rates unless you have a lot of cash in your brokerage account, but at least it pays some interest. You can get more details and check the current rates on the Scottrade website.
E*TRADE: Of all the online brokers, E*TRADE is perhaps best known for its cash management features. In addition to stock brokerage services, E*TRADE also offers banking services as E*TRADE bank. With an E*TRADE brokerage account, you get access to an online savings account. Funds can be easily and quickly transferred between accounts. E*TRADE also allows you to set up an automatic savings plan. Currently, E*TRADE’s online savings accounts pays 1.75% interest. The E*TRADE bank also offers online checking and CDs. Because these rates change frequently, you can get current rates and details about E*TRADE’s brokerage services on the E*TRADE website.