Calculate your Certificate of Deposit earnings, compare terms, build a CD ladder, and see how CDs stack up against high-yield savings accounts.
| Rung | Term | Deposit | APY | Interest | Final Value | Matures |
|---|
A Certificate of Deposit is a savings product offered by banks and credit unions that pays a fixed interest rate in exchange for leaving your money deposited for a specified period — called the term. Unlike a regular savings account where your rate can change at any time, a CD locks in your rate from the moment you open it until it matures. That rate guarantee is the CD's core value proposition: certainty in an uncertain interest rate environment.
CDs are among the safest investments available. Deposits at FDIC-insured banks are protected up to $250,000 per depositor, per institution, per ownership category. At NCUA-insured credit unions, the same protection applies. This makes CDs essentially risk-free for amounts within those limits — you will get back exactly what you put in, plus interest, guaranteed.
The trade-off for this safety and rate certainty is liquidity. Once you open a CD, your money is locked up for the term. Most CDs charge an early withdrawal penalty — typically 3 to 6 months of interest for shorter terms, and 6 to 12 months for longer terms — if you need to access your funds before maturity. This is why understanding your time horizon before choosing a CD is critical. A CD that matures exactly when you need the money is a perfect financial instrument; one that matures a year too late is a costly mistake.
CD interest is calculated using compound interest: A = P(1 + r/n)^(nt), where A is the final balance, P is the principal, r is the annual interest rate as a decimal, n is the number of compounding periods per year, and t is the time in years. The more frequently interest compounds, the more you earn — though the difference between daily and monthly compounding is usually small in practice.
Most banks advertise CDs using the Annual Percentage Yield (APY), which already accounts for compounding. APY is the standardized number for comparing CDs across institutions — always compare APYs, not nominal rates. A CD with a 4.95% nominal rate compounding daily has a slightly higher APY than one with a 5.00% nominal rate compounding annually.
| CD Term | Typical APY Range | Best For | Early Withdrawal Penalty |
|---|---|---|---|
| 3 months | 4.50–5.25% | Very short-term parking | 1–3 months interest |
| 6 months | 4.75–5.40% | Short-term savings goals | 3 months interest |
| 12 months | 4.50–5.25% | Most popular term | 3–6 months interest |
| 18 months | 4.25–5.00% | Medium-term certainty | 6 months interest |
| 24 months | 4.00–4.75% | 2-year planning horizon | 6 months interest |
| 36 months | 3.75–4.50% | Rate lock in declining env. | 6–9 months interest |
| 60 months | 3.50–4.25% | Long-term rate certainty | 12 months interest |
A CD ladder is a strategy that solves the CD's biggest drawback — illiquidity — while still capturing most of the rate advantage over a savings account. Instead of depositing all your money into a single CD, you split it equally across multiple CDs with staggered maturity dates. As each CD matures, you reinvest it into the longest term on your ladder, maintaining a rolling cycle of maturing CDs.
For example, a 5-rung CD ladder with $25,000 would divide it into five $5,000 CDs maturing at 1, 2, 3, 4, and 5 years. After year 1, the first CD matures — giving you access to $5,000 plus interest — and you reinvest it in a new 5-year CD. After year 2, the second matures, and so on. Once fully established, you have a CD maturing every 12 months, giving you annual liquidity while always holding 5-year CD rates.
Both CDs and high-yield savings accounts (HYSAs) are FDIC-insured, low-risk options for cash savings. The choice comes down to three factors: rate, flexibility, and time horizon. CDs typically offer higher rates than HYSAs in exchange for locking up your money. HYSAs offer full liquidity — you can withdraw anytime — but their rates can change at any time without notice.
In a rising rate environment, HYSAs have an edge because their rates increase as the Federal Reserve raises rates, while CD rates are locked in at the time of opening and cannot increase. In a falling rate environment, CDs win because you've locked in the higher rate before it dropped. A HYSA rate that's 4.75% today may fall to 3.50% in 12 months if the Fed cuts rates — that reduction happens automatically and without your consent. A 12-month CD opened today at 4.75% stays at exactly 4.75% until its maturity date, regardless of what the Federal Reserve does to benchmark rates in the meantime. That rate certainty is worth paying for when rates are high and expected to decline.
The best CD for you depends on three things: when you need the money, how much you're depositing, and whether you think interest rates will rise or fall during the term. Getting these three factors right is more important than finding the absolute highest rate — a 5-year CD at 4.50% is a terrible choice if you need the money in 18 months.
For emergency funds you might need any time, CDs are generally the wrong choice — keep emergency money in a HYSA or money market account. For planned near-term expenses (a car purchase in 12 months, a vacation in 6 months, a home down payment in 2 years), a CD with a matching term is ideal. For longer-term savings with no specific end date, a CD ladder provides the best combination of rate and flexibility. For retirement savings, CDs can play a role in the fixed-income portion of your portfolio, though they typically underperform bonds over long periods.
Many banks offer "jumbo CDs" for deposits of $100,000 or more, sometimes paying a slightly higher rate than standard CDs. The rate premium varies — at some banks it's 0.10–0.25% higher; at others it's negligible. Always compare jumbo CD rates against standard CDs before assuming the higher minimum earns meaningfully more. Online banks often offer standard CD rates that exceed the jumbo rates at traditional brick-and-mortar banks. Before assuming a jumbo CD at your local bank is the best deal, compare it against the standard CD offerings at online institutions — you may find a higher rate with a lower minimum deposit requirement, keeping more cash available for other uses and still earning maximum yield on your deposit.
| Goal / Situation | Recommended Approach | Why |
|---|---|---|
| Emergency fund | High-Yield Savings Account | Full liquidity, no penalty |
| Saving for specific date | Single CD matching that date | Lock rate, predictable outcome |
| General cash savings | CD ladder (3–5 rungs) | Balance rate + liquidity |
| Uncertain timeline | No-penalty CD or HYSA | Flexibility without sacrifice |
| Rates expected to fall | Longer-term CD | Lock in today's high rates |
| Rates expected to rise | Short-term CD or HYSA | Reinvest at higher rates soon |