CD vs High-Yield Savings Calculator \

Rate Lock vs. Rate Flexibility

The core trade-off is certainty versus optionality. A CD guarantees your rate from day one — you know exactly how much interest you will earn. A high-yield savings account lets you withdraw freely but pays a variable rate the bank can change at any time.

In a falling-rate environment, the CD wins because your locked rate stays put while the HYSA rate drifts down. In a rising-rate environment, the HYSA may overtake the CD because new rates apply immediately to your full balance. The formula FV = P(1 + r/n)^nt applies to both products, but r is fixed for the CD and variable for the HYSA.

The calculator lets you model both scenarios. Enter the CD rate you have been offered, then enter the HYSA rate you currently earn, and compare the projected balances at the end of the term you choose.

When Each Option Makes Sense

For short holds under six months, a HYSA usually wins because any CD penalty for early withdrawal would eat into the small interest advantage. For longer horizons of 12 to 18 months, a CD may come out ahead if the locked rate is higher than what the HYSA is likely to maintain.

Early withdrawal penalties vary, but a common structure is three months of interest for a 12-month CD. That means breaking early erases roughly one quarter of your total expected earnings. If liquidity matters — emergency funds, for example — the HYSA avoids that risk entirely. Some savers on personal-finance forums use both products simultaneously: a CD ladder for planned spending targets and a HYSA for reserves that must stay accessible.

Enter your own numbers in the calculator to see the dollar difference for your specific deposit, rate pair, and time frame.

Neither the CD rate nor the HYSA rate shown here is a market quote. Enter the rates you have been offered for your personal comparison.