A CD investment, or certificate of deposit, is a savings product that pays a guaranteed interest rate in exchange for leaving a lump sum on deposit for a fixed period, usually somewhere between three months and five years. You hand over the money, the bank locks in a rate, and at the end of the term you get your deposit back plus the interest it earned. Deposits are federally insured up to $250,000, which puts CDs among the lowest-risk places to hold money you won’t need in the near term.
How a CD Works
Opening a CD means agreeing to three things: the amount you’re depositing (the principal), how long you’ll leave it (the term), and the interest rate the bank will pay. Standard CDs typically require $500 to $1,000 to open, though many online banks have dropped minimums altogether.
The advertised rate is expressed as an Annual Percentage Yield (APY), which reflects the total interest paid on the account after accounting for how often the bank compounds interest across a 365-day period.1eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD) Compounding frequency does move the needle. A CD compounding daily earns slightly more than one compounding monthly at the same nominal rate, so comparing APYs is the only way to make a fair comparison.
The fixed rate is the whole point. Once you lock in, the rate holds no matter what happens in the broader economy. If market rates drop six months into a two-year CD, you keep earning the original rate. If they climb, you’re stuck earning less until the CD matures, unless you hold a specialty type designed for that scenario.
Types of CDs
The plain fixed-rate CD is by far the most common, but banks have built out several variations to address different tolerances for locking money up.
Bump-Up and Step-Up CDs
A bump-up CD lets you request a rate increase, usually once or twice during the term, if the bank has raised rates on newly issued CDs. You have to watch rates yourself and ask; nothing happens automatically.
A step-up CD works differently. The bank builds a schedule of predetermined rate increases into the contract from day one. The starting rate is usually lower than a comparable fixed-rate CD, and the blended APY accounts for the scheduled bumps across the full term.
No-Penalty CDs
Also called liquid CDs, these let you withdraw your full balance before the term ends without paying an early withdrawal fee. The rates are typically lower than a standard CD of the same length. They sit in the middle ground between a savings account and a traditional CD, useful when you think you might need the money sooner than planned.
Jumbo CDs
Jumbo CDs traditionally require $100,000 or more and sometimes pay slightly higher rates. The premium has shrunk in recent years as online banks have pushed up competition on smaller deposits.
Callable CDs
Callable CDs carry a risk that runs opposite to what most people expect. A callable CD gives the bank, not you, the right to redeem the CD before maturity. If interest rates fall, the bank can call the CD, return your principal plus earned interest, and end the deal, leaving you to reinvest at lower rates.2U.S. Securities and Exchange Commission. High-Yield CDs: Protect Your Money by Checking the Fine Print
The initial rate tends to be higher as compensation for that risk. Read the fine print. A “one-year non-callable” CD does not mature in one year; it means the bank cannot call the CD during the first year, but the actual maturity could be 15 or 20 years out.2U.S. Securities and Exchange Commission. High-Yield CDs: Protect Your Money by Checking the Fine Print
Add-On CDs
Most CDs won’t accept additional deposits after opening. Add-on CDs are the exception, letting you add money during the term at a rate you’ve already locked in.
Brokered CDs vs. Bank CDs
You can also buy CDs through a brokerage firm rather than directly from a bank. The underlying product is still a bank-issued, FDIC-insured CD, but the mechanics differ in a couple of ways that matter.
The biggest difference is how you exit early. At a bank, you pay the bank’s early withdrawal penalty. With a brokered CD, you sell it on the secondary market to another investor. If rates have risen since you bought in, the market value will have fallen and you could get back less than you deposited. If rates have dropped, you might sell at a premium. There is no guarantee of finding a buyer quickly, and you’ll face transaction costs like markdowns or commissions.
The trade-off is convenience. A single brokerage account can hold CDs from dozens of banks, which makes rate shopping and diversification simple. Brokered CDs also come in a broader range of terms and structures than any one bank offers.
How Your Deposit Is Protected
CDs at banks are insured by the Federal Deposit Insurance Corporation (FDIC). The standard maximum deposit insurance amount is $250,000, set under federal law.3Office of the Law Revision Counsel. 12 USC 1821 – Insurance Funds Credit union CDs get the same $250,000 of protection through the National Credit Union Administration’s Share Insurance Fund.4Federal Register. Display of Official Sign; Permanent Increase in Standard Maximum Share Insurance Amount
That $250,000 cap applies to the combined total of your deposits at one institution within the same ownership category. Checking, savings, money market, and CD balances at the same bank all count together. If you hold more than that at one institution, different ownership categories (individual, joint, revocable trust) each get their own $250,000 of coverage, so you can layer protection without moving to another bank. Trust and payable-on-death accounts extend that further, with coverage up to $250,000 per eligible beneficiary and a cap of $1,250,000 for five or more beneficiaries.5FDIC. Financial Institution Employee’s Guide to Deposit Insurance – Trust Accounts
What Happens at Maturity
When your term ends, you get full access to your principal and the interest it earned. Federal rules require the bank to give you notice ahead of time. For CDs that auto-renew and have terms longer than one month, the bank must send notice at least 30 calendar days before maturity. For CDs longer than one year that do not auto-renew, notice must arrive at least 10 days before maturity.6eCFR. 12 CFR 1030.5 – Subsequent Disclosures
After maturity, you typically get a grace period of 7 to 10 days to withdraw the money, change the term, or move it elsewhere.7Office of the Comptroller of the Currency. My Certificate of Deposit (CD) Matured, but I Didn’t Redeem It Do nothing and most CDs auto-renew into a new term of the same length at whatever rate the bank is currently offering, which may be nothing like what you were earning. Put maturity dates on your calendar. Getting swept into an auto-renewal at an inferior rate is one of the most common and most avoidable CD mistakes.
Breaking a CD Early
Take money out before the maturity date and you’ll pay an early withdrawal penalty. Federal law sets a floor: within the first six days after deposit, the penalty is at least seven days’ simple interest. Beyond that, there is no federal cap on what banks can charge.8Office of the Comptroller of the Currency. What Are the Penalties for Withdrawing Money Early From a CD?
In practice, banks set the penalty as some number of months of interest. Short-term CDs (under a year) commonly charge around three months of interest; longer-term CDs might charge six to twelve months. If you break a CD you’ve only held for a short time, the penalty can dip into your principal, meaning you get back less than you put in. The exact formula lives in your account agreement, and it varies enough between banks that you should read it before you fund the account.
How CD Interest Is Taxed
CD interest is ordinary income at the federal level and in most states. The wrinkle: you owe tax in the year the interest is credited to your account, not the year the CD matures. The IRS treats interest as constructively received once it is credited to your account and available for withdrawal.9Internal Revenue Service. Publication 550, Investment Income and Expenses
For CDs longer than one year that don’t pay interest until maturity, the IRS treats the built-in interest as original issue discount (OID). You have to report a portion of that OID as income each year you hold the CD, not just at the end.10Internal Revenue Service. Publication 1212, Guide to Original Issue Discount (OID) So a five-year CD that pays everything at maturity still triggers a tax bill every single year along the way.
Your bank issues a Form 1099-INT for any year in which your CDs earn $10 or more in interest.11Internal Revenue Service. About Form 1099-INT, Interest Income The amount goes on your federal return whether the interest was withdrawn or left inside the CD.
CDs Inside an IRA
Holding a CD inside a traditional or Roth IRA changes the tax picture. In a traditional IRA, you don’t pay annual tax on interest as it accrues; tax is due when you take distributions. In a Roth IRA, qualified distributions come out entirely tax-free (including the interest) once you’re at least 59½ and the account has been open for five years or more.12Internal Revenue Service. Retirement Plans FAQs Regarding IRAs Distributions (Withdrawals)
The catch is a potential double penalty. Break the CD early while you’re under 59½ and you can face the bank’s early withdrawal penalty on the CD plus a 10% additional tax from the IRS on the early IRA distribution.13Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions Some exceptions to the 10% tax apply (disability, certain medical expenses, first-time home purchases up to $10,000), but the bank’s CD penalty is separate and applies regardless.
Building a CD Ladder
Laddering is the most common CD strategy because it resolves the core tension of CD investing: wanting the higher rates that come with longer terms, but still wanting periodic access to your money.
The setup is straightforward. Instead of dropping $10,000 into a single five-year CD, you split it into five $2,000 CDs with staggered terms: one, two, three, four, and five years. When the shortest one matures, you roll it into a new five-year CD. A year later, do the same with the next. After five years, every CD in the ladder is earning a five-year rate, but one matures each year. You always have relatively quick access to a portion of your money without triggering penalties.
CDs vs. Treasury Securities
Treasury bills, notes, and bonds compete for the same conservative dollars as CDs. The differences come down to taxes, liquidity, and how the protection is structured.
Treasury interest is exempt from state and local income taxes under federal law. CD interest is not. In a high-tax state, that gap can mean a Treasury with a lower stated yield actually delivers more after-tax income than a CD with a higher one. In a state with no income tax, the advantage disappears.
Treasuries can be sold on the secondary market at any time, though the price moves with interest rates. Bank CDs stay locked until maturity unless you pay the penalty. CDs are federally insured up to $250,000; Treasuries are backed by the full faith and credit of the U.S. government with no dollar limit.3Office of the Law Revision Counsel. 12 USC 1821 – Insurance Funds
Inside a tax-advantaged account like an IRA, the state-tax advantage of Treasuries goes away, because earnings in those accounts aren’t subject to state income tax anyway. That often tilts the comparison back toward CDs when top CD rates exceed comparable Treasury yields.