CDs and money market accounts (MMAs) both have the same end goal, which is to save and stack money over time. Both are taxable, protected by the Federal Deposit Insurance Corporation (FDIC), and require an initial deposit of at least $1000. There are some key differences that divide the two. MMAs feature a tiered interest rate, while the interest rate of CDs remains fixed. Despite being fixed, the interest rates on a CD are typically higher than what you’d find in an MMA. The balance requirements of CDs are higher, too, which is why you’ll find better interest rates.