CD Basics Explained
A Certificate of Deposit (CD) is a type of federally insured savings account offered by banks and credit unions. Unlike traditional savings accounts, you agree to keep your deposit locked in the bank for a set period (varying from 1 month to 5 years) in exchange for a guaranteed, fixed interest rate that is usually higher than standard savings rates.
How CD Compounding Works
When you open a CD, your interest rate is locked for the entire term. Interest typically compounds daily or monthly and is added to your CD balance. When the CD reaches its maturity date, you can withdraw your principal and interest or roll the balance into a new CD term.
Pros and Cons of CDs
CDs offer guaranteed, stable returns and are protected by federal FDIC insurance, making them incredibly safe. However, they lack liquidity; because your funds are locked for the term, you cannot access your cash in an emergency without paying a penalty.
Early Withdrawal Penalty Rules
If you withdraw your money from a CD before its maturity date, you will face an early withdrawal penalty. Lenders usually calculate this penalty as a set number of months of interest (e.g., 3 months of interest for a 1-year CD). This penalty can sometimes eat into your original principal.
Worked CD Yield Example
Suppose you invest $10,000 in a 3-year CD with a 4.75% interest rate compounded monthly.
The maturity value is calculated using the compound interest formula: A = P * (1 + r/n)^(n*t).
Here, P = $10,000, interest rate r = 0.0475, compounding frequency n = 12, and term t = 3.
Plunging in the values: A = 10,000 * (1 + 0.0475/12)^36 = $11,527.78.
You will earn a guaranteed $1,527.78 in interest over the 3-year term.
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