How CD interest works
A certificate of deposit (CD) pays compound interest — interest that earns interest. The compounding frequency (daily, monthly, quarterly, or annually) determines how often earned interest gets added to your balance. Most CDs compound daily or monthly.
A = P × (1 + r/n)^(n×t)
P = principal · r = APY as decimal · n = compounding periods/year · t = years
The rate you see advertised is the APY (Annual Percentage Yield), which already accounts for compounding. Two CDs with the same APY but different compounding frequencies produce nearly identical returns — APY is the apples-to-apples number for comparison.
Typical CD rates by term
CD rates depend on the term length, the bank, and the current interest rate environment. These are typical ranges as of 2026 — actual rates vary. Online banks and credit unions usually offer higher APYs than large brick-and-mortar banks.
| Term | Typical APY range |
|---|---|
| 3-month | 3.5% – 5.0% |
| 6-month | 3.8% – 5.2% |
| 1-year | 4.0% – 5.3% |
| 2-year | 3.8% – 4.8% |
| 3-year | 3.7% – 4.6% |
| 5-year | 3.5% – 4.5% |
These are illustrative ranges — check current rates with your bank or a comparison site before investing.
$10,000 CD examples
Value of a $10,000 CD at different rates and terms (monthly compounding):
| Term | 4% APY | 4.5% APY | 5% APY |
|---|---|---|---|
| 3-month | $10,100 | $10,113 | $10,126 |
| 6-month | $10,202 | $10,227 | $10,253 |
| 1-year | $10,407 | $10,459 | $10,512 |
| 2-year | $10,831 | $10,940 | $11,049 |
| 3-year | $11,273 | $11,442 | $11,615 |
| 5-year | $12,210 | $12,518 | $12,834 |
CD vs savings vs money market
CDs are one of several low-risk options for cash. Compare liquidity, APY, and risk before choosing:
| Product | APY | Liquidity | Risk |
|---|---|---|---|
| CD (1-year) | 4.0–5.3% | Locked until maturity | FDIC-insured to $250K |
| High-yield savings | 3.5–5.0% | Withdraw anytime | FDIC-insured; rate can drop |
| Money market account | 3.0–4.5% | Limited withdrawals/month | FDIC-insured; variable rate |
| Treasury bills (3-12 mo) | 4.0–5.2% | Sell on secondary market | Backed by US government |
| Series I savings bonds | Variable, inflation-linked | 12-month lockup; 5yr penalty | US government backed |
CD laddering strategy
A CD ladder splits your cash across CDs with staggered maturity dates, giving you both higher long-term rates and regular access to funds.
Example: $25,000 5-year 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
Each year, one CD matures. Reinvest it in a new 5-year CD (at whatever rate is current) or withdraw the funds. After year 5, you have five 5-year CDs with one maturing each year — earning top-tier rates with annual liquidity.
Laddering hedges interest rate risk. If rates rise, you reinvest at higher rates each year. If rates fall, only one CD's worth of money gets reinvested at the lower rate.
Are CDs taxable?
Yes — CD interest is taxed as ordinary income at your federal marginal tax rate. This is different from long-term capital gains or qualified dividends, which get lower rates.
Interest is reported to the IRS on Form 1099-INT if you earn $10+ in a year. Taxes are owed in the year interest is credited, not when you withdraw. For a long-term CD, you may owe tax on interest you haven't received yet.
Hold CDs inside an IRA to defer taxes, or inside a Roth IRA to grow tax-free. State income taxes may also apply, depending on your state.
Early withdrawal penalties
Breaking a CD before maturity triggers a penalty — typically calculated as a number of months of interest:
| CD term | Typical early-withdrawal penalty |
|---|---|
| Under 1 year | 3 months of interest |
| 1–3 years | 6 months of interest |
| 4+ years | 12 months of interest |
If you withdraw very early — before much interest has accrued — the penalty can dig into your principal. Some banks offer no-penalty CDs that allow one free withdrawal, but they typically pay 0.5–1% lower APY.
When CDs make sense
CDs are a good fit when:
- You have a known future expense — saving for a down payment in 2 years or a wedding in 18 months. A matching CD term locks in the rate and protects against market volatility.
- Rates are high and you expect them to fall — locking in a 5% APY for 3–5 years beats watching savings account rates drop as the Fed cuts.
- You want risk-free income — FDIC insurance covers up to $250K. A 5% CD earns $500 per $10,000 per year, guaranteed.
- You have an emergency fund already — keep 3–6 months of expenses in a liquid savings account, then use CDs for funds you don't need immediate access to.
CDs are a poor fit for long-term retirement savings (where stocks historically beat CDs over decades) or for emergency funds you might need to tap quickly.
Frequently asked questions
What is a CD (certificate of deposit)?
A certificate of deposit (CD) is a bank savings product where you deposit a fixed amount of money for a set term (3 months to 5+ years) and the bank pays you a guaranteed interest rate, higher than most savings accounts. In exchange, you can't access the money until the CD matures without paying an early-withdrawal penalty. CDs at FDIC-insured banks are covered up to $250,000 per depositor, per bank.
How is CD interest calculated?
CDs use compound interest. The formula is A = P × (1 + r/n)^(n×t), where P is the deposit, r is the annual APY as a decimal, n is the compounding frequency per year (daily, monthly, quarterly, annually), and t is the term in years. For example, $10,000 at 5% APY compounded monthly for 1 year = $10,000 × (1 + 0.05/12)^12 ≈ $10,512. The more frequent the compounding, the slightly higher the final balance.
What is APY vs APR?
APY (Annual Percentage Yield) is the effective annual rate you earn after compounding — this is what you see advertised on CDs. APR (Annual Percentage Rate) is the nominal rate before compounding. A 5% APR compounded monthly has an APY of 5.12%. For CDs, always compare APY — it's the apples-to-apples return. Our CD calculator uses APY directly to compute your maturity value.
Are CD earnings taxable?
Yes — CD interest is taxed as ordinary income at your federal marginal rate (10%, 12%, 22%, 24%, 32%, 35%, or 37%). Banks send you a 1099-INT if you earn $10+ in a year. State taxes may also apply. A 5% CD earning $500 in interest costs $110 in tax at the 22% bracket, leaving $390 after-tax ($500 × 0.78). CDs held in IRAs defer taxes; CDs in Roth IRAs grow tax-free. Interest is taxed in the year it's credited, even if not withdrawn.
What happens when a CD matures?
At maturity, you have a grace period (typically 7–10 days) to decide: (1) withdraw the full amount (principal + interest) with no penalty, (2) let the CD automatically renew at the bank's current rate for the same term, (3) move the funds to a new CD or different account. If you do nothing, most banks auto-renew — which may lock you into a lower rate. Set a calendar reminder for your maturity date.
Can I withdraw from a CD early?
Yes, but you'll pay an early-withdrawal penalty. Typical penalties: 3 months of interest for CDs under 1 year, 6 months for 1–3 year CDs, 12 months for 4+ year CDs. Some banks charge a flat fee or a percentage of the deposit. If you withdraw very early, the penalty can exceed the interest earned, dipping into your principal. No-penalty CDs exist but usually offer lower APYs. Always read the CD disclosure before opening.
What is a CD ladder?
A CD ladder splits your savings across multiple CDs with staggered maturity dates. Example with $25,000: put $5,000 each in 1, 2, 3, 4, and 5-year CDs. Each year, one CD matures — you either withdraw the cash or reinvest it in a new 5-year CD. This gives you annual access to funds while earning the higher long-term rates. It reduces the risk of locking in when rates later rise.
Are CDs FDIC insured?
CDs at FDIC-insured banks are covered up to $250,000 per depositor, per bank, per ownership category. This means your principal and accrued interest are fully protected if the bank fails. Credit-union CDs (share certificates) have the same $250,000 insurance through NCUA. Brokered CDs are bought through a brokerage but are still FDIC-insured at the issuing bank. Uninsured products (market-linked CDs, some step-up CDs) may exceed FDIC limits — check carefully.
What is the best CD term?
It depends on the interest rate environment and your timeline. In a rising-rate environment, shorter terms (3–12 months) let you reinvest at higher rates soon. In a falling-rate environment, longer terms (3–5 years) lock in today's higher rates. A CD ladder hedges both ways. If you need the money in 6 months, a 6-month CD is safer than a 5-year CD with a penalty. Never invest in a CD you might need to break early.
How much interest will I earn on a $10,000 CD?
At 5% APY compounded monthly: $10,000 earns about $512 in 1 year, $1,050 in 2 years, $1,618 in 3 years, and $2,834 in 5 years. At 4%: about $408 in 1 year and $2,167 in 5 years. At 3%: about $304 in 1 year and $1,616 in 5 years. Higher APYs plus longer terms plus daily/monthly compounding maximize your return. Use our CD calculator above to model your exact deposit, rate, and term.