What Is a Certificate of Deposit (CD)? Pros and Cons

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A certificate of deposit (CD) is a time deposit at a bank or credit union. You deposit a fixed sum for a set term, the institution pays interest at a rate agreed when you open the account, and you get the principal plus interest back on the maturity date. In exchange for that rate you give up access to the money: taking it out before maturity usually triggers an early withdrawal penalty. Credit unions offer the same product under the name share certificate.

A CD sits between a savings account and a bond. Like a savings account, it is a deposit, and it is covered by federal deposit insurance up to the legal limit at an insured institution. Like a bond, it has a fixed term, usually a fixed rate, and a defined payoff date. Terms commonly run from three months to 10 years.

How a certificate of deposit works

Opening a CD works like opening any deposit account, usually funded with a single deposit. Four elements define the contract.

1. Principal. The amount you deposit at opening. Most CDs accept a single deposit; you cannot keep adding money the way you can with a savings account.
2. Term. The length of time you agree to leave the funds in place. The term ends on the maturity date, when you can withdraw without penalty.
3. Interest rate. Usually fixed for the full term. The rate is quoted alongside the annual percentage yield (APY), which reflects compounding.
4. Account terms. The bank or credit union sets the early withdrawal penalty, how often interest compounds and is credited, what happens at maturity (often automatic renewal), and the length of any grace period.

Interest is typically credited to the CD balance at regular intervals and compounds, often daily or monthly, though the schedule depends on the institution. Some CDs let you have interest paid out to a checking or savings account instead. Paid-out interest does not compound inside the CD, so the yield is slightly lower than the quoted APY assumes.

APY and the maturity value formula

The nominal rate and the APY are not the same number. The nominal rate is the stated annual rate before compounding. The APY is the effective annual return once interest earns interest:

APY = (1 + r / n)^n − 1

where r is the nominal annual rate as a decimal and n is the number of compounding periods per year.

The value of a CD at maturity, assuming interest stays in the account and compounds, is:

Maturity value = P × (1 + r / n)^(n × t)

where P is the principal and t is the term in years.

Loans are usually quoted as an annual percentage rate (APR), which treats compounding and fees differently. Compare CDs by APY, which puts different compounding schedules on the same footing.

Example of a certificate of deposit

Hypothetical example, not any institution’s terms. You deposit $10,000 in a 2-year CD with a nominal rate of 4.00%, compounded daily (365 periods per year). Interest stays in the account.

• APY = (1 + 0.04 / 365)^365 − 1 ≈ 4.08%
• Maturity value = $10,000 × (1 + 0.04 / 365)^(365 × 2) ≈ $10,832.81
• Total interest ≈ $832.81

If the same CD compounded only annually, the maturity value would be $10,000 × 1.04² = $10,816.00. The difference of about $17 is the effect of compounding frequency alone. With a fixed rate, you know the $10,832.81 figure on day one. It does not change if market rates move during the two years, in either direction.

Types of CDs

• Fixed-rate CD. The rate is set for the entire term. This is the default product and the one the formulas above describe.
• Variable-rate CD. The rate is tied to an index and can move up or down during the term.
• Bump-up CD. Lets you raise your rate to the institution’s current rate for your term, typically once, if rates rise. The rate cannot fall.
• No-penalty (liquid) CD. Allows withdrawal before maturity without a penalty, usually after an initial waiting period. These tend to pay less than standard CDs of similar length.
• Jumbo CD. Requires a large minimum deposit, commonly $50,000 or $100,000. A higher minimum does not guarantee a higher rate.
• Brokered CD. Bought through a brokerage account rather than directly from a bank. The brokerage buys CDs issued by banks and offers them to customers. Brokered CDs can often be sold before maturity on a secondary market instead of being broken with a penalty, but the sale price depends on current rates and can be below what you paid.
• Callable CD. The issuer can redeem the CD before maturity, typically when rates have fallen, which ends your higher rate early. Callable CDs may offer a higher rate to compensate.
• Negotiable CD. A large-denomination CD, often $100,000 or more, that can be traded among investors. It is mainly an institutional product.
• Yankee CD. Issued in the U.S. by a branch of a foreign bank and denominated in dollars.
• IRA CD. A CD held inside an individual retirement account, so its interest follows IRA tax rules rather than being taxed each year.

Variable-rate and bump-up CDs protect against rising rates but often start below the best fixed-rate CDs of the same term, so weigh that cost against the rate increase you expect.

Choosing a CD term

Start with when you will need the money. For a dated goal, such as a down payment, tuition or a car purchase, choose a term that matures shortly before that date so the funds are penalty-free when you need them. If the money has no set purpose and you are confident you will not touch it, a longer term may earn a higher rate.

The rate outlook also matters, because a fixed rate is a bet on the direction of rates:

• If rates are expected to rise, short and medium terms keep you from locking in a rate that new CDs will soon beat. A high-yield savings account, a variable-rate CD or a bump-up CD are alternatives.
• If rates are expected to fall, a longer term locks in the current rate for years after new CD rates have dropped.

Rate forecasts are often wrong, which is one reason many savers spread money across several maturities (see CD ladders below). Shorter CDs sometimes pay more than longer ones, so compare APYs across terms.

How much you need to open a CD

Each institution sets its own minimum opening deposit. Some CDs can be opened with as little as $100 or even no minimum, while others require $500, $1,000 or more. A bank may apply one minimum to all its CDs or set different minimums by term.

Some institutions pay a higher APY on larger balances through rate tiers, but a modest deposit at a competitive institution can beat a large one at a bank with low rates.

Are CDs safe?

For principal protection, CDs at insured institutions are among the safest places to hold cash. Two separate protections apply.

The issuer’s obligation. The bank or credit union is contractually bound to pay the principal and the agreed interest at maturity, under the terms of the deposit agreement.

Federal deposit insurance. The Federal Deposit Insurance Corporation (FDIC) insures deposits at member banks, and the National Credit Union Administration (NCUA) insures deposits at federally insured credit unions, up to $250,000 per depositor, per insured institution, per ownership category. Ownership categories include single, joint, certain retirement and trust accounts, so one person can have more than $250,000 insured at one institution. CDs are insured together with your other deposits there, such as checking and savings, so the limit applies to the combined total in each category.

Insurance applies only at an FDIC- or NCUA-insured institution. Confirm that status directly with the FDIC or NCUA before opening an account, especially with an online bank or unfamiliar brand, which may be a trade name of a chartered bank. For brokered CDs, coverage comes from the issuing bank and counts toward your limit there.

Can you lose money on a CD?

With a standard CD held to maturity at an insured institution, within insurance limits, you get back your principal plus the stated interest. Losses can still happen in specific situations:

• Early withdrawal penalties can exceed the interest earned so far and reduce principal (see the worked example below).
• Balances above the insurance limit are exposed if the institution fails.
• Brokered CDs sold before maturity trade at market prices. If rates have risen since purchase, the CD may sell for less than face value.
• Inflation erodes purchasing power. A CD paying less than the inflation rate loses real value even though the dollar balance grows.
• Opportunity cost is not a loss of principal, but money locked at a fixed rate cannot capture higher rates that become available later.

Early withdrawal penalties

Most CDs let you withdraw before maturity in exchange for an early withdrawal penalty (EWP). The penalty formula is set in the deposit agreement, so you can evaluate it before you commit.

The most common structure charges a number of months of interest, with longer terms carrying larger penalties. A hypothetical schedule might charge three months’ interest on terms up to 12 months, six months’ interest on terms up to three years, and 12 months’ interest on longer terms. Every bank and credit union sets its own schedule. Some use a flat percentage of the amount withdrawn instead, which can outweigh the interest earned, depending on the APY and how long the money has been in the account.

Some institutions allow a partial withdrawal with the penalty applied only to the amount taken out. Others require closing the whole CD. Banks may waive the penalty in certain circumstances, such as the death or legal incompetence of the owner, but that depends on the agreement.

Worked example

Hypothetical example, not any institution’s terms. Take the $10,000, 2-year, 4.00% CD from earlier, with a penalty of six months’ simple interest. You close it after four months.

• Interest earned after four months ≈ $10,000 × 0.04 × 4/12 ≈ $133
• Penalty ≈ $10,000 × 0.04 × 6/12 = $200
• Payout ≈ $10,000 + $133 − $200 = $9,933

Because the penalty is larger than the interest earned, it takes about $67 from principal, assuming the agreement allows that, as many do. After 18 months roughly $600 of interest has accrued, so the same $200 penalty leaves a positive return. If there is any chance you will need the money early, the penalty formula matters as much as the rate.

What happens at maturity

Before the maturity date, the institution must notify you and explain your options. You typically have three:

1. Renew or roll over the funds into a new CD, usually one with the same or a similar term, at whatever rate the institution offers on that day.
2. Transfer the proceeds to a savings, checking or money market account at the same institution.
3. Withdraw the proceeds to an external bank account or by check.

Most CDs include a grace period after maturity, often several days to a couple of weeks, during which you can withdraw or change terms without penalty. If you do nothing, many CDs renew automatically into a new term. Once the grace period ends, the new CD’s early withdrawal penalty applies.

Automatic renewal uses the institution’s standard rate for that term, which can be well below rates available elsewhere, so compare rates before the grace period ends.

Adding money to a CD

Most CDs do not accept additional deposits during the term. To put more money into CDs, you open another one. Some institutions allow added deposits during the grace period at renewal, and a few offer “add-on” CDs that accept deposits during the term, usually with limits.

CD ladders

A CD ladder spreads money across several CDs with staggered maturities. The aim is regular access to part of your cash while most of the balance earns longer-term rates.

Hypothetical example. You have $25,000 to put in CDs and build a five-rung ladder:

• $5,000 in a 1-year CD
• $5,000 in a 2-year CD
• $5,000 in a 3-year CD
• $5,000 in a 4-year CD
• $5,000 in a 5-year CD

When the 1-year CD matures, you move its proceeds into a new 5-year CD. A year later the original 2-year CD matures, and its proceeds also go into a 5-year CD. After five years, you hold five 5-year CDs, one maturing every 12 months.

The ladder addresses two problems of a single CD. Liquidity: about one-fifth of the money becomes available each year without a penalty. Rate timing: you reinvest at a series of rates instead of betting everything on one moment. If rates rise, each maturing rung renews higher; if they fall, the rungs in place keep their older rates until they mature. A ladder does not make every dollar available on demand, and it does not maximize return if rates move in one direction for a long time.

Variations include shorter rungs (for example, 3-month steps up to 12 months) for money you may need sooner, and “barbell” approaches that split money between very short and very long terms.

How CD rates are set

Each institution sets its own CD rates, but the Federal Reserve’s policy rate drives the general level. The Federal Open Market Committee (FOMC) sets a target range for the federal funds rate, the rate banks charge each other for overnight loans of reserves, at meetings held eight times a year. When the target range rises, rates on loans and deposits, including CDs, generally move up; when it falls, they generally move down.

Within that environment, a bank’s CD rates also reflect:

• Its funding needs. A bank that wants more deposits may pay above-market rates, sometimes through promotional or “special” CDs with unusual terms.
• Competition and cost structure. Online banks without branch networks often pay more than large branch-based banks.
• The term. Expectations about future rates shape how much more, or less, a long CD pays than a short one.
• Deposit size. Some banks pay tiered rates by balance.

How CD interest is taxed

In the U.S., CD interest is taxable as ordinary income at federal and, in most cases, state level. It is taxable in the year it is credited to your account or made available to you, not when you withdraw it or when the CD matures. On a multi-year CD that compounds, you owe tax each year on that year’s interest even though the money stays in the CD.

Institutions report interest on Form 1099-INT, generally when it totals $10 or more for the year, but all interest is reportable regardless. If you pay an early withdrawal penalty, the penalty amount appears on the 1099-INT and can generally be deducted as an adjustment to income.

CDs held inside an IRA follow the account’s rules instead: interest grows tax-deferred in a traditional IRA, or potentially tax-free in a Roth IRA, subject to the usual IRA conditions.

CDs vs. savings, money market accounts and bonds

A savings or money market account suits an emergency fund and money you may need at short notice, because the rate can change at any time but the cash stays available. A CD suits money with a known horizon, where a guaranteed rate is worth the restriction.

Do not confuse a money market account (a bank deposit) with a money market fund (an investment product sold by brokerages and fund companies), which is not FDIC-insured.

Bonds resemble CDs in having a term and a fixed rate, but a bond is a security issued by a government or corporation, not a bank deposit, so it carries no deposit insurance and its value can fall with credit problems or rising rates. U.S. Treasury securities and savings bonds are backed by the federal government, and their interest is exempt from state and local income tax, which can matter for savers in high-tax states.

Compared with stocks, CDs offer stability but less long-run growth. Indexes such as the S&P 500 can fall sharply in a given year but have historically returned more, so CDs usually serve short horizons or the conservative part of a portfolio.

Pros and cons of a certificate of deposit

Pros

• Predictable return. A fixed rate means you know the maturity value on the day you open the CD.
• Principal protection. Federal deposit insurance applies within the limits described above.
• Potentially higher rates than standard savings accounts.
• Built-in discipline. The penalty discourages dipping into money set aside for a specific goal.
• Simple to compare. APY, term, minimum and penalty cover most of what distinguishes one CD from another.

Cons

• Limited access. Early withdrawal costs a penalty that can reach into principal.
• Rate lock risk. A fixed rate stays put if market rates rise.
• Inflation risk. Returns can trail inflation, especially after tax.
• Lower long-run growth than stocks and many bond investments.
• Wide rate dispersion. Many institutions pay low CD rates, and automatic renewal can lock you into them.

FAQs

The Bottom Line

CDs suit savers with money set aside for a known date who want a guaranteed rate and insured principal. Match the term to when you need the funds, check the penalty formula as closely as the APY, and consider a ladder if rate timing is uncertain. Compare rates before the grace period ends, because automatic renewal can lock you into a low rate.