How much interest can a $40,000 three-year CD earn at current rates?

Locking $40,000 into a three-year certificate of deposit could produce thousands of dollars in interest, but the choice comes with a trade-off: the money would remain committed until 2029.

The article says the highest three-year CD rate available this September is 4.50%, although some banks offer less. At that rate, a $40,000 deposit would grow to $45,646.64 at maturity, assuming the account remains untouched and avoids penalties. A 4.40% rate would produce $5,515.73 in interest, while a 4.35% rate would produce $5,450.36.

A fixed-rate CD can shield the principal from market movements and provide a predictable return. But inflation, possible interest-rate increases, rising debt balances and the loss of access to the money may make the commitment unsuitable for some savers. An early-withdrawal penalty could also be especially expensive on a deposit of this size.

Rates have increased in recent months. The top three-year rate stood at 4.15% in July, which would have generated $5,189.53 by maturity, while rates in June 2025 often topped out around 4.00%. The article advises savers to compare banks before making a long-term deposit.