Several factors affect how much you earn from a CD. For starters, banks decide how competitive they want to be. If they have an appetite for new customers, they may nudge rates higher. Economic factors also influence CD rates. As rates rise or fall in financial markets, savings and CD rates tend to move in synchrony, although they might not react immediately (especially when it’s time to pay you more). The length of your CD is critical. In general, you might expect longer-term CDs to pay more because you’re taking more risk—you’re committing to more months or years of unknowns. But the relationship is not always as direct as you might think. For example, if banks think rates might fall in the next several years, long-term CDs might pay rates that are similar to (or lower than) 1-year and 2-year CDs.