Some of the largest banks pay the worst savings rates. You could earn hundreds more by moving your money elsewhere. g-stockstudio / Getty Images Close Key Takeaways How Big Banks Keep Their Savings Rates So Low It's common knowledge that banks pay interest on savings accounts. They do so because they want you to deposit your money with them and keep it there, allowing the bank to issue loans with those deposits to earn profits. What's less understood is just how dismal the biggest banks' payouts are. Resear ...