Learn the ins and outs of trading commission-free. Getty Images By the editors of Kiplinger's Personal Finance From Kiplinger's Personal Finance, December 2017 Full-service broker. Merrill Edge customers who enroll in Preferred Rewards (from Merrill’s parent, Bank of America) can qualify for up to 30 free stock trades a month. There’s a catch: You’ll need to maintain at least $50,000 in combined monthly balances at Merrill and BofA. Stashing at least $100,000 with the firm gets you up to 100 free trades a month. Either way, customers also qualify for perks such as cash-back bonuses on credit cards and lower rates on car loans and mortgages. SEE ALSO: 5 Investments Yielding 5% or More Kiplinger's Best List, 2017 Best FAANG-less Stocks 3 Best International Mutual Funds to Play the Global Economic Recovery Best Ways to Make the Most of Rising Interest Rates Best Ways to Get Free Trades at Online Brokers Best Vales in Tech Best Health Savings Account Best Phone Plans for Every Type of User Best Benefits of Amazon Prime Best Ways for Investors to Play Defense Best Rewards Credit Cards The Best Bank for You Best Tax Software for You Best College Majors for Your Career Best College Savings Plan Discount broker. Robinhood, an online-only brokerage launched in 2015, offers commission-free stock trading on its mobile app (available for Apple and Android devices). There’s no minimum deposit to open an account, and placing a trade takes just a few taps and a swipe on your device. The drawbacks: You can trade only stocks and exchange-traded funds through the app, and you won’t get any research or tools. For accounts with less than $25,000, Robinhood also limits day trading—buying and selling the same stock in the same day. Limited-time offers. Fidelity and Schwab provide free trades for up to two years as a bonus for opening a new account. Fidelity dishes out 300 commission-free trades if you deposit between $50,000 and $99,999, and up to 500 free trades if you stash $100,000 or more. At Schwab you get up to 500 free trades with a deposit of $100,000 or more. Both firms earned high scores in Kiplinger’s 2017 survey of online brokers (see We Pick the Best Online Brokers).