What Is a Certificate of Deposit (CD)? Definition and How CDs Work
Last updated 04/13/2026 by
Ante Mazalin
Edited by
Andrew Latham
Summary:
A certificate of deposit (CD) is a federally insured savings account that pays a fixed interest rate in exchange for leaving a set amount of money on deposit for a defined term — typically ranging from one month to five years.
CDs come in several forms, each suited to a different savings goal or flexibility need.
- Traditional CD: Best for savers who want a guaranteed, predictable return and won’t need access to the funds before the term ends.
- No-penalty CD: Best for savers who want a CD-level rate but need the option to withdraw early without a fee — typically at a lower rate than standard CDs.
- Jumbo CD: Best for depositors with $100,000 or more who want to maximize yield on a large cash position.
- CD ladder: Best for savers who want ongoing liquidity — staggering multiple CDs with different maturity dates so funds free up at regular intervals.
For savers who’ve already funded an emergency fund and want their cash working harder, a CD is one of the few ways to lock in a guaranteed return with no market risk and full federal insurance coverage.
The trade-off is access — once the term starts, pulling money out early almost always triggers a penalty. Understanding exactly how that penalty works, and when a CD makes more sense than a high-yield savings account, is what turns a CD from a marketing product into a useful financial tool.
Compare CD Accounts
Compare certificates of deposit. Discover your best option.
How a Certificate of Deposit Works
When you open a CD, you deposit a fixed sum with a bank or credit union for a specified term. The institution agrees to pay a fixed interest rate — expressed as an annual percentage yield (APY) — for that entire period. At maturity, you receive your principal plus all interest earned.
The core mechanism that makes CDs work is the commitment. You agree not to withdraw the funds during the term; in exchange, the institution offers a higher rate than it would on a flexible account. Most CDs automatically renew at maturity if you don’t act within a short grace period (usually 7–10 days), so it’s worth marking the maturity date on your calendar.
APY vs. Interest Rate on a CD
APY — annual percentage yield — accounts for the effect of compounding over a full year. It’s the number that matters when comparing CDs across institutions, because it reflects what you actually earn, not just the stated rate. A CD with a 4.75% interest rate compounded daily has a slightly higher effective APY than one compounded monthly at the same stated rate.
Types of Certificates of Deposit
Banks and credit unions have expanded the CD product menu well beyond the traditional fixed-term structure. The right type depends on how certain you are about your timeline and how much flexibility you need.
| CD Type | How It Works | Best For |
|---|---|---|
| Traditional CD | Fixed rate, fixed term; early withdrawal penalty if funds accessed before maturity | Savers with a defined timeline and no expected need for the funds |
| No-Penalty CD | Allows early withdrawal without a fee after a short holding period (typically 6–7 days) | Savers who want higher yield than a savings account but aren’t certain about their timeline |
| Jumbo CD | Requires a minimum deposit of $100,000; typically offers a slightly higher rate | Depositors with large cash positions seeking to maximize insured yield |
| Bump-Up CD | Allows you to request a rate increase once or twice if rates rise during the term | Savers opening CDs in a rising-rate environment who expect rates to increase |
| Step-Up CD | Rate increases automatically at preset intervals during the term | Savers who want built-in rate improvement without monitoring the market |
| Brokered CD | Purchased through a brokerage account; can be sold on secondary market before maturity | Investors who want CD-like returns with the ability to exit early without an early withdrawal penalty |
| IRA CD | CD held inside an IRA — contributions follow IRA rules; earnings grow tax-deferred or tax-free | Savers using a CD as the fixed-income component of a retirement account |
CD Rates: What to Expect
CD rates move with the federal funds rate — when the Federal Reserve raises rates, CD yields typically rise; when it cuts rates, CD yields fall. According to the FDIC, the national average for a 12-month CD has ranged between 0.1% and 5.5% in recent years depending on the rate cycle.
Online banks and credit unions consistently offer significantly higher rates than traditional brick-and-mortar banks. The gap can be 1–2 percentage points on identical terms — a meaningful difference on any balance. Comparing CD rates across institutions before opening takes minutes and is one of the highest-return-per-hour financial decisions a saver can make.
Pro Tip: When a CD matures, you typically have a 7–10 day grace period to withdraw, add funds, or change terms before automatic renewal locks you in for another full term — often at a lower rate than you could get by shopping around. Set a calendar reminder 2 weeks before your CD matures so you’re not inadvertently locked into a suboptimal rate for another year.
Early Withdrawal Penalties
The cost of breaking a CD early varies by institution and term length, but the FDIC requires all insured banks to disclose early withdrawal penalties clearly before you open a CD. Common penalty structures:
- Short-term CDs (under 1 year): Typically 90 days of interest
- 1–2 year CDs: Typically 150–180 days of interest
- 3–5 year CDs: Typically 240–365 days of interest
If a CD is broken early enough — before enough interest has accrued — the penalty can eat into principal. On a 5-year CD broken after 3 months, the penalty could exceed all interest earned and reduce your original deposit. Always read the penalty terms before committing.
CD Ladder Strategy
A CD ladder solves the access problem by spreading a sum of money across multiple CDs with staggered maturity dates. As each one matures, you can reinvest at the current long-term rate or use the funds — without ever having all your money locked up at once.
A basic 5-rung ladder splits money equally into 1-year, 2-year, 3-year, 4-year, and 5-year CDs. When the 1-year matures, you reinvest in a new 5-year CD (now the longest rung). Over time, you maintain ongoing access to a portion of your savings every 12 months while still capturing longer-term rates.
How to Open a Certificate of Deposit
Opening a CD takes less than 15 minutes once you’ve chosen an institution. Following this order ensures you don’t lock in at a suboptimal rate.
- Define your timeline and deposit amount. CDs work best for money you genuinely won’t need for the full term. Decide how long you can commit before comparing rates.
- Compare rates across multiple institutions. Use a CD comparison tool to see current APYs from banks and credit unions. Online-only banks and credit unions consistently offer the highest rates.
- Confirm the early withdrawal penalty before applying. Read the penalty terms — especially if you’re considering a longer term. A no-penalty CD may be worth a slightly lower rate if your timeline is uncertain.
- Open the account and fund it. Most CD applications are completed online. You’ll link an external bank account for the initial transfer. Some institutions require the full deposit upfront; others allow funding within a short window after approval.
- Set a maturity date reminder. Mark the maturity date in your calendar with a 2-week lead. If you don’t act during the grace period, most CDs auto-renew at the current rate — which may be lower than what you could get elsewhere.
CD vs. High-Yield Savings Account
Both products offer FDIC insurance and competitive rates relative to standard savings accounts, but they serve different functions depending on whether you need liquidity.
Read our new comparison: HYSA vs. CD: Which Is Better for Your Savings Goal?
| Feature | CD | High-Yield Savings Account |
|---|---|---|
| Rate type | Fixed for the term — guaranteed | Variable — can rise or fall with Fed rate changes |
| Access to funds | Locked until maturity; early withdrawal penalty applies | Fully accessible; no penalty to withdraw |
| Typical APY vs. standard savings | Higher on longer terms; premium for committing funds | Higher than traditional banks; rate not guaranteed |
| FDIC insured | Yes — up to $250,000 per depositor per institution | Yes — up to $250,000 per depositor per institution |
| Best for | Defined-timeline savings: down payment fund, known future expense | Emergency fund, ongoing savings with flexibility |
The decision comes down to certainty: if you know you won’t need the money for 12 or 24 months, a CD typically offers a higher guaranteed rate. If there’s any chance you’ll need access, a high-yield savings account or no-penalty CD is the safer structure.
Key takeaways
- A CD pays a fixed APY in exchange for a commitment not to withdraw funds during the term — early withdrawal almost always triggers a penalty that can reduce or eliminate the interest earned.
- CD rates track the federal funds rate — comparing rates across institutions before opening can yield 1–2% more APY than defaulting to a traditional bank.
- All CDs at FDIC-insured banks are covered up to $250,000 per depositor per institution per ownership category — the same coverage as savings and checking accounts.
- A CD ladder — splitting funds across multiple staggered-term CDs — preserves periodic access to cash while capturing long-term rates.
- No-penalty CDs offer early withdrawal without fees, typically at a slightly lower rate than traditional CDs — the right choice when timeline certainty is low.
- At maturity, CDs typically auto-renew during a 7–10 day grace period if no action is taken — marking the date in advance prevents being locked into a new term at a suboptimal rate.
Frequently Asked Questions
What is a certificate of deposit?
A certificate of deposit (CD) is a savings product offered by banks and credit unions that pays a fixed interest rate in exchange for leaving a set amount of money on deposit for a defined term. Unlike a regular savings account, you commit to leaving the funds untouched — withdrawing early triggers a penalty.
Are CDs safe?
Yes. CDs at FDIC-insured banks and NCUA-insured credit unions are covered up to $250,000 per depositor per institution per ownership category — meaning your principal and accrued interest are protected even if the institution fails. For balances above $250,000, spreading funds across multiple institutions or ownership categories extends coverage.
What happens when a CD matures?
At maturity, most CDs enter a grace period — typically 7–10 days — during which you can withdraw funds, add to the deposit, change the term, or let it renew automatically. If you take no action before the grace period ends, the CD typically auto-renews for the same term at the current prevailing rate, which may be higher or lower than your original rate.
Can you lose money in a CD?
Not through market movement — CDs have no market risk. You can lose a portion of interest (or in extreme cases, a small amount of principal) by withdrawing before the term ends and incurring the early withdrawal penalty. If the penalty exceeds interest earned so far, the penalty is deducted from principal.
What is the difference between APR and APY on a CD?
APR is the simple annual interest rate without compounding. APY accounts for compounding — interest earned on previously earned interest — and represents what you’ll actually earn over a full year. For CDs, always compare APY, not APR, because compounding frequency varies by institution and affects your actual return.
How much does a CD pay on $10,000?
It depends on the APY and term. A $10,000 CD at 4.5% APY for 12 months earns approximately $450 in interest. The same CD held for 24 months (assuming the same rate) earns approximately $920, as compounding adds a small amount in year two. CD calculators can model any combination of deposit amount, rate, and term precisely.
Is a CD better than a savings account?
A CD is better when you’re certain you won’t need the funds before maturity — it typically offers a higher, locked-in rate. A savings account is better for money you may need access to, like an emergency fund. The right answer depends on your liquidity needs and timeline, not just the rate comparison.
Ready to find the highest CD rates available today? Compare CD rates from banks and credit unions on SuperMoney and filter by term length to find the best fit for your timeline.
Table of Contents