A certificate of deposit (CD) pays a fixed interest rate in exchange for a promise to leave your money alone for a set period. That promise is the catch: if you lock everything into a single five-year CD and then need cash in year two, you may pay a penalty to get out. A CD ladder is a common way to soften that problem. This guide explains what a ladder is, how to build one, and where it falls short.
This article is general information, not personalized financial advice. Rates, terms and penalties differ by bank and credit union, so read the account disclosure before you open any CD.
What a CD is, in plain terms
The Consumer Financial Protection Bureau (CFPB) describes a CD as a type of savings account offered by banks and credit unions. You agree to leave the money in for a term, and you compare offers on three points: the term, the interest rate, and the penalty for taking money out early. Bank CDs are insured by the FDIC and credit union CDs by the NCUA, in both cases up to $250,000 under the standard limits (see the sources at the bottom of this page for the exact rules).
Because a CD locks in its rate when you buy it (Vanguard's wording), the interest you will earn is known up front. That predictability can suit money you do not expect to need soon, kept separate from your everyday emergency fund.
What is a CD ladder?
A CD ladder spreads a fixed amount of money across several CDs with different maturity dates. Instead of one large CD that matures all at once, you hold several smaller ones that mature one after another. Each CD is a "rung." As one rung matures, you either use the cash or reinvest it, often in a new CD at the far end of the ladder.
FINRA (the Financial Industry Regulatory Authority) describes the same idea in its investor education material: divide the total sum you are comfortable locking away equally across multiple CDs with varying maturity dates. Vanguard's educational material gives the same basic definition: a ladder spreads savings across CDs that mature at different times, which gives you regular access to some of your money while it earns fixed interest.
How to build a CD ladder, step by step
- Decide how much money can be locked away. Only use money you are reasonably sure you will not need before the first rung matures. Keep your emergency savings in an account you can reach without penalty, such as a high-yield savings account.
- Pick the number of rungs and the length of the ladder. One design uses one CD each for one, two, three, four and five years; Fidelity's model five-year ladder, for example, has rungs at 1, 2, 3, 4 and 5 years to maturity. A shorter ladder with three rungs works the same way.
- Split the money evenly. Equal rungs keep the plan simple and make each future maturity the same size.
- Compare offers for each term. For each rung, look at the rate, the minimum deposit, and the early-withdrawal penalty. Different institutions may lead for different terms, so you may end up with CDs at more than one bank.
- Open the CDs and write down every maturity date. Put the dates in a calendar with a reminder a few weeks ahead (see the note on grace periods below).
- Roll each maturing rung forward. When the shortest CD matures, you can reinvest it in a new CD at the longest term on your ladder. Over time, every rung becomes a long-term CD, but one of them still matures every year.
A worked example (hypothetical numbers)
The figures below are made up to show the mechanics. They are not current rates and not a prediction.
Suppose you set aside $9,000 and build a three-rung ladder with $3,000 in each CD:
| Rung | Term | Matures |
|---|---|---|
| 1 | 1 year | End of year 1 |
| 2 | 2 years | End of year 2 |
| 3 | 3 years | End of year 3 |
At the end of year 1, rung 1 matures and $3,000 plus its interest becomes available. If you do not need the cash, you open a new three-year CD with it. That new CD matures at the end of year 4. At the end of year 2, rung 2 does the same, and its replacement matures at the end of year 5. At the end of year 3, rung 3 does the same, and its replacement matures at the end of year 6. From then on you hold three-year CDs that mature at the end of years 4, 5 and 6, so money comes free once a year, and every new CD you buy is a three-year CD.
Vanguard's published example follows the same pattern with different amounts: a sum split into a one-year, a two-year and a three-year CD, with each earning interest at the rate offered for its own term.
Why people use CD ladders
- Partial access to cash. A slice of your money comes due on a schedule you know in advance, so you may be less likely to need to break a CD early.
- A fixed return on each rung. Each CD locks in its rate when you buy it. That suits savers who want to know what a balance will be on a certain date.
- Less guesswork about rates. If rates rise, maturing rungs can be reinvested at the higher rates. If rates fall, your older CDs may still pay more than new ones. Schwab describes the same logic for bond ladders in general, and also notes the flip side: if rates fall, you may be reinvesting maturing money at lower yields.
- Insurance planning. Because each CD can sit at a different institution, a ladder can help you keep each balance within the standard $250,000 insurance limit at any one bank. See our guide on what happens if an online bank fails.
What a CD ladder does not fix
A ladder reduces the chance you will need an early withdrawal. It does not remove it.
- Early-withdrawal penalties still apply. Federal rules (Regulation DD) require the account disclosure to state whether a penalty will or may be imposed for early withdrawal and how it is calculated. The SEC's investor bulletin notes that redeeming a CD before it matures may mean paying an early-withdrawal penalty or forfeiting a portion of the interest you earned, so read the exact wording. Penalties differ between institutions.
- Reinvestment risk. If rates drop by the time a rung matures, the new CD may pay less than the one that just ended.
- Minimum deposits. Vanguard notes that most CDs require a minimum deposit, which can make a ladder with many rungs hard to fund with a small balance.
- You can lose track of dates. Vanguard lists forgetting maturity dates among the common pitfalls of a ladder. The same disclosure rules require the bank to say whether a CD renews automatically at maturity and, if it does, whether a grace period applies and how long it lasts. If a CD renews automatically and you do nothing, it may roll into a new term, so read the disclosure for how the renewal works.
- A ladder is not a diversified portfolio. Fidelity cautions that a ladder, depending on what it holds, may not ensure adequate diversification of your overall investments.
- Brokered CDs work differently. CDs bought through a brokerage generally do not carry the same early-withdrawal penalties as CDs bought from a bank. Instead you can generally sell on a secondary market, subject to market conditions, and you may lose some of your original investment if the market price has fallen, according to an SEC investor bulletin.
CD ladder or something else?
A ladder is one of several tools for cash you will not need right away. A high-yield savings account keeps your money accessible, but its rate may change after you open the account (Regulation DD calls such an account a variable-rate account). A single CD gives certainty on one date. U.S. Treasury bills are another way to build maturities in a staggered pattern; our article on a Treasury bill ladder covers that approach. Which one suits you depends on how soon you may need the money, how much it matters to know the rate in advance, and what penalties you can tolerate.
Quick checklist before you open a CD
- Is this money I am unlikely to need before the CD matures?
- Do I know the penalty for early withdrawal and how it is calculated?
- Does the CD renew automatically, and how long is the grace period?
- Are my total deposits at this bank within the $250,000 insurance limit for my ownership category?
- Have I put every maturity date in my calendar?
Bottom line
A CD ladder trades some simplicity for flexibility: instead of locking everything up at once, you stagger the maturities so money becomes available on a schedule. It will not guarantee the best possible return, and it will not protect you from penalties if you break a CD early. Used with a separate emergency fund and a clear calendar of dates, it can be a straightforward way to put idle savings to work. For an overview of how interest builds over time, see compound interest explained simply.
Sources
- CFPB, "What is a certificate of deposit (CD)?" https://www.consumerfinance.gov/ask-cfpb/what-is-a-certificate-of-deposit-cd-en-917/
- CFPB, Regulation DD (Truth in Savings), 12 CFR 1030.4 account disclosures (early-withdrawal penalty statement; automatic renewal and grace period statement). https://www.consumerfinance.gov/rules-policy/regulations/1030/4/
- FDIC, "Understanding Deposit Insurance." https://www.fdic.gov/resources/deposit-insurance/understanding-deposit-insurance
- FDIC, "Are My Deposit Accounts Insured by the FDIC?" (lists CDs among insured deposit products). https://www.fdic.gov/resources/deposit-insurance/financial-products-insured
- FINRA, "Bank Products" (CD ladder description). https://www.finra.org/investors/investing/investment-products/bank-products
- Vanguard, "What is a CD ladder?" https://investor.vanguard.com/investor-resources-education/article/cd-ladder
- Investor.gov (SEC), "Brokered CDs: Investor Bulletin." https://www.investor.gov/introduction-investing/general-resources/news-alerts/alerts-bulletins/investor-bulletins/brokered-cds-investor-bulletin
- CFPB, Regulation DD, 12 CFR 1030.2 definitions (variable-rate account). https://www.consumerfinance.gov/rules-policy/regulations/1030/2/
- Schwab, "Bond Laddering" (ladder and rate-direction rationale). https://www.schwab.com/fixed-income/bond-ladders
- Fidelity, "Understanding Model CD Ladders" (diversification caution). https://www.fidelity.com/bin-public/060_www_fidelity_com/documents/Understanding-Model-CD-Ladders.pdf