CD Ladders: How They Work and Why People Build Them
A CD ladder spreads savings across certificates that mature at different times, so some money comes due every year. Here is how to build one, with a worked example.
A certificate of deposit (CD) pays a fixed rate for a fixed term, in exchange for locking up your money. Longer terms often pay more, but tie up the money longer. A CD ladder is a way to get some of the longer-term rate without committing all your savings for years.
How a ladder works
Instead of putting everything into one CD, you split it across several with staggered maturities. As each one matures, you either use the money or reinvest it in a new long-term CD at the far end of the ladder.
A hypothetical $25,000 split into five rungs of $5,000:
| Rung | Term | Hypothetical APY | First-year interest |
|---|---|---|---|
| 1 | 1 year | 4.0% | $200 |
| 2 | 2 years | 4.1% | $205 |
| 3 | 3 years | 4.2% | $210 |
| 4 | 4 years | 4.3% | $215 |
| 5 | 5 years | 4.4% | $220 |
| Total | $1,050 |
Show the numbers behind this chart
| Hypothetical APY | |
|---|---|
| 1-year | 4.0% |
| 2-year | 4.1% |
| 3-year | 4.2% |
| 4-year | 4.3% |
| 5-year | 4.4% |
After year one, the 1-year CD matures. You reinvest it in a new 5-year CD. Now every rung is a 5-year CD, but one matures every year. From then on, you have access to a fifth of the money each year while most of it earns the longer-term rate.
Why people build ladders
- Regular access. Some money becomes available every year without paying early withdrawal penalties.
- Rate averaging. You don't have to guess the perfect time to lock in. If rates rise, maturing rungs get reinvested at higher rates. If they fall, the longer rungs keep their higher rates for a while.
- Predictability. Each rung's rate and maturity value are known in advance.
Trade-offs
- Early withdrawal penalties. Taking money out before a CD matures usually costs some interest. The size of the penalty varies by bank and term.
- Inflation risk. A fixed rate can fall behind inflation over a multi-year term; see our article on inflation and real returns.
- Inverted rate curves. Sometimes shorter CDs pay more than longer ones. A ladder still provides structure, but the longer-term premium may not exist.
- Taxes. CD interest is generally taxable as ordinary income in the year it's earned, even if you don't withdraw it, unless the CDs are held in a tax-advantaged account.
Variations
- Shorter ladders using 3-, 6-, 9-, and 12-month CDs for money you'll need within a year or two.
- Treasury ladders using Treasury bills or notes, which are backed by the U.S. government and whose interest is generally exempt from state income tax.
- Brokered CDs bought through a brokerage account, which can be sold before maturity on a secondary market, at a price that may be higher or lower than what you paid.
Deposit insurance
CDs at banks are generally covered by FDIC insurance and CDs at credit unions by NCUA insurance, up to applicable limits per depositor, per institution, per ownership category. If your ladder is large, spreading it across institutions or ownership categories can keep everything within the limits.
The takeaway
A CD ladder gives you a known rate on most of your money while keeping some of it available every year. It suits money you want to keep safe and won't need all at once, and it removes the pressure of trying to time interest rates.
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