Maturity value on a certificate of deposit
Maturity value on a certificate of deposit
A CD is a time deposit: you commit a fixed sum for a fixed period, and the bank pays a fixed rate in return. The rate is typically higher than a standard savings account because you have given up access to the money for the term. Withdraw early and you pay a penalty, usually several months of interest.
Enter your deposit, the APY offered, the term in months, and how often interest compounds to see the maturity value and total interest earned.
CDs use standard compound interest:
A = P(1 + r/n)nt
Where P is the deposit, r the annual rate, n the compounding periods per year, and t the term in years. A $10,000 deposit at 4.5% compounded monthly for 12 months matures at about $10,459, earning $459 in interest.
A useful distinction: APY already includes the effect of compounding, while an interest rate does not. When comparing offers, compare APY to APY. A 4.4% rate compounded daily and a 4.5% rate compounded annually are closer than the headline numbers suggest.
On $10,000 at 4.5% for a year, annual compounding earns $450 and daily compounding earns about $460. The difference is roughly $10 — real, but not a reason to choose one bank over another if the APY differs by even a tenth of a percent.
The rate is what matters. Compounding frequency is a second-order effect, and because APY already reflects it, comparing APYs handles the question automatically.
The main drawback of a CD is that your money is locked while rates may change. Laddering addresses this. Instead of one $25,000 five-year CD, you open five $5,000 CDs maturing in one, two, three, four, and five years.
Each year one matures. You either take the cash if you need it, or roll it into a new five-year CD at whatever rate then prevails. After the initial build-out, you hold five-year rates — usually the highest — while having access to a portion of your money every twelve months. It removes most of the timing risk without giving up much yield.
CDs suit money with a known date and no tolerance for loss: a house deposit eighteen months away, a tax bill, a planned purchase. They are federally insured up to the standard limits, which makes them among the safest places to hold cash.
They are a poor fit for an emergency fund, because emergencies do not wait for maturity and the early withdrawal penalty defeats the purpose. A high-yield savings account is better there. They are also unsuitable for long-term growth — over decades, CD returns tend to trail inflation-adjusted returns from diversified investing by a wide margin.
Early withdrawal penalty. Commonly three to twelve months of interest depending on term. Know the figure before you commit.
Automatic renewal. Many CDs roll over into a new term at maturity, sometimes at a worse rate, unless you act within a short grace period. Set a reminder.
Minimum deposit and whether the advertised rate requires a larger balance or a linked account.
Tax treatment. Interest is taxable in the year it is credited, even if you cannot access it, unless the CD sits inside a tax-advantaged account.
The interest rate is the base rate before compounding. APY includes the effect of compounding and therefore reflects what you actually earn over a year. Always compare APY to APY when shopping for a CD.
You pay a penalty, typically three to twelve months of interest depending on the term. On short CDs this can exceed the interest earned, meaning you get back less than you deposited.
Generally no. Emergencies do not wait for maturity, and the early withdrawal penalty undermines the purpose. A high-yield savings account keeps the money accessible while still earning interest.
Splitting your money across CDs with staggered maturities so one matures each year. It lets you capture longer-term rates while keeping part of your money accessible annually, reducing the risk of locking everything in at the wrong time.