A certificate of deposit account works like this: you hand a bank or credit union a set amount of money, agree not to touch it for a set period, and in return the bank pays you a fixed interest rate that’s usually higher than a savings account. When the term ends, you get your original deposit back plus the interest it earned. Pull the money out early and you’ll owe a penalty.
That’s the whole product in one paragraph. The rest is detail worth knowing before you open one.
What You Decide When You Open a CD
Two choices define the account. The first is how much to deposit, called the principal. The second is how long you’re willing to leave it alone, called the term. Once the account is funded, most traditional CDs are closed to further deposits. That’s different from a savings account, where you can add money whenever you like.
Terms run from as short as one month to as long as ten years. One-year through five-year terms are the most common. Shorter terms pay less but free up your money sooner. Longer terms pay more because the bank can count on your funds for longer. Federal rules classify CDs as “time deposits,” meaning the bank is entitled to at least seven days’ notice before you withdraw.
Minimum deposits vary. Some online banks have no minimum. Others require $500 or $1,000. A “jumbo CD” typically starts at $100,000, though some institutions set the bar at $50,000. Jumbo CDs sometimes pay a bit more, but the premium has shrunk as online banks have pushed standard CD rates up.
How the Interest Adds Up
Every CD comes with two numbers: the interest rate and the annual percentage yield (APY). The interest rate is the base figure the bank applies to your balance. The APY folds in compounding and tells you what a full year actually returns. When comparing CDs across banks, the APY is the number that matters because it puts everything on the same footing.
Compounding is why the APY is higher than the stated rate. Each time the bank credits interest to your balance, that credited interest starts earning interest of its own. Daily compounding beats monthly, which beats quarterly. On a small deposit the difference is minor. On a larger deposit over several years, it’s real money.
What It Costs to Break the CD Early
Taking your money out before the term ends triggers an early withdrawal penalty. This is the core tradeoff of a CD and the main reason banks can pay you more than they’d pay in a savings account. The penalty is spelled out in your deposit agreement, and it’s worth reading before you sign.
Federal regulation sets only a minimum floor: if you withdraw within the first six days, the bank must charge at least seven days’ simple interest.1Federal Reserve. Consumer Compliance Handbook – Regulation D Beyond that six-day window, banks set their own penalties. In practice they vary widely. Short-term CDs of a year or less typically carry penalties of 90 days to six months of interest. Longer CDs of three to five years often run 150 days to a full year of interest, and some institutions charge 18 to 24 months on a five-year CD.
If you close the account early enough, the penalty can exceed the interest you’ve earned. When that happens, the bank takes the shortfall out of your principal, so you get back less than you deposited. Before opening any CD, ask yourself honestly whether you might need the money before the term ends. If the answer isn’t a confident no, a shorter term or a no-penalty CD is worth a look.
What Happens When the CD Matures
The maturity date is when your term ends and you can access your money without penalty. Federal rules require the bank to notify you in advance: at least 30 calendar days before maturity, or at least 20 days before the grace period ends if the bank offers a grace period of five or more days.2eCFR. 12 CFR 1030.5 – Subsequent Disclosures The notice tells you the maturity date, the renewal rate, and any changes in terms.
After maturity, you get a grace period, at least five days by federal rule and often seven to ten. During that window you can withdraw your principal and interest, move the funds to another account, or roll into a new CD term of your choosing.
Do nothing and the bank will automatically renew your CD into a new term of the same length at its current rate. That rate might be significantly lower than what you were earning. Once the grace period closes, you’re locked in again, with fresh early withdrawal penalties on the new term. Mark the maturity date on your calendar the day you open the CD, not the day the notice arrives.
Your Money Is Insured
CDs at banks are insured by the Federal Deposit Insurance Corporation (FDIC). CDs at credit unions are covered by the National Credit Union Administration (NCUA). Both agencies insure deposits up to $250,000 per depositor, per institution, per ownership category.3Office of the Law Revision Counsel. 12 U.S.C. 1821 – Insurance Funds4MyCreditUnion.gov. Share Insurance If the bank fails, the government either transfers your deposit to a healthy institution or sends you a check. That backstop is why CDs are treated as one of the safest places to keep cash.
The “per ownership category” language matters. An individual account and a joint account count as separate categories, so a couple can insure more than $250,000 at a single bank by splitting CDs across different ownership structures.
How the Interest Is Taxed
CD interest is taxable as ordinary income. The federal tax code treats interest as gross income, with no lower rate the way long-term capital gains get.5Office of the Law Revision Counsel. 26 U.S. Code 61 – Gross Income Defined
Timing is where people get tripped up. On a CD with a term of one year or less, you report the interest in the year you receive it or become entitled to it. On a CD with a term longer than one year, the IRS treats the interest as “original issue discount,” and you owe tax on a portion each year even though you won’t see the money until maturity.6Internal Revenue Service. Publication 550 – Investment Income and Expenses A three-year CD that pays all its interest at maturity still generates a tax bill every year along the way.
Your bank will send a Form 1099-INT by January 31 each year if you earned at least $10 in interest. Even if you earn less than $10 and get no form, the interest is still reportable.7Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID If your total interest and dividend income exceeds $1,500 for the year, you’ll also need to file Schedule B. One consolation: if you paid an early withdrawal penalty, you can deduct it as an adjustment to income whether or not you itemize. The penalty amount shows up in Box 2 of your 1099-INT.
Variations on the Standard CD
The traditional fixed-rate CD is the most common version, but several variations address specific drawbacks.
No-Penalty CDs
A no-penalty CD lets you withdraw the full balance before maturity without a penalty. You usually have to wait at least seven days after opening the account, and you typically must take the whole balance out at once rather than a partial amount. Rates run slightly lower than a traditional CD of the same term.
Bump-Up and Step-Up CDs
Both address the risk that rates will climb after you’ve locked in. A bump-up CD lets you request a rate increase once or twice during the term if the bank’s current rates have risen. You have to track rates and ask. A step-up CD raises your rate automatically on a schedule the bank sets in advance, often starting from a lower initial rate.
Add-On CDs
An add-on CD lets you make additional deposits during the term while keeping your locked-in rate. Early withdrawal penalties still apply if you pull funds out before maturity.
Brokered CDs
Brokered CDs are bought through a brokerage account rather than directly from a bank. They often carry competitive rates because the broker shops across multiple institutions. If you need your money early, you don’t pay a penalty; instead you sell the CD on a secondary market. If rates have risen since you bought, the market value will have fallen and you could take a loss. A buyer isn’t guaranteed. Brokered CDs are FDIC-insured when the broker meets pass-through requirements, and the balance combines with any other deposits you hold at the same underlying bank for coverage purposes.8FDIC.gov. Your Insured Deposits
Callable CDs
A callable CD pays a higher rate, but the bank can close the account before maturity. If rates drop, the bank will “call” the CD, return your principal and the interest earned so far, and stop paying you the premium rate. You keep what you’ve already earned, but you lose out on the future interest you were counting on. There’s usually an initial non-callable period during which the bank can’t exercise the option.
CD Laddering
A CD ladder splits your deposit across multiple CDs with staggered maturities. Instead of putting $10,000 into a single five-year CD, you open five CDs of $2,000 each with terms of one, two, three, four, and five years. Each time a CD matures, you reinvest it into a new five-year CD.
The setup does two things. It gives you a CD maturing regularly, so a portion of your money is always coming free without penalty. And it captures the higher rates paid on longer terms across most of your balance while keeping some flexibility. If rates rise, each maturing CD gets reinvested at the new higher rate. If rates fall, most of your balance is already locked in at the older, higher rates. A ladder won’t produce the absolute best return in every rate environment, but it reduces the risk of locking everything in at the wrong moment.