Calculate your Certificate of Deposit returns with compound interest, tax considerations, and a detailed year-by-year breakdown.
Amount you plan to deposit (min. $500 at most banks)
Annual Percentage Yield — top rates run 4.5–5.5% in 2025–2026
Daily compounding earns slightly more than annual at the same APR
Additional months (0–11)
CD interest is taxed as ordinary income — leave 0% for tax-advantaged accounts
Short-term 12-month CD at 5.0% APY
2-year CD with competitive 4.75% APY
5-year CD laddering strategy at 4.25%
High-balance jumbo CD at 5.25% APY
The CD ladder approach splits $25,000 into five $5,000 CDs with staggered maturities. Each year one CD matures — giving you cash when you need it while the others keep compounding at higher long-term rates.
A CD grows using compound interest — you earn interest on your principal and on previously earned interest. The standard formula is:
Where is your principal, is the annual rate, is compounding periods per year, and is time in years. A $10,000 CD at 5% compounded daily for 5 years yields ≈ $12,840.
Banks advertise APY (Annual Percentage Yield), which already bakes in the compounding effect. That's the number to compare. APR ignores compounding, so it's always lower than APY. The effective APY formula is:
At 5% APR compounded daily, the APY is actually 5.127%. Doesn't sound like much, but on $100,000 over 5 years it's roughly $650 extra.
In a typical rate environment, longer terms earn higher yields. But in 2025–2026, the yield curve is relatively flat — so a 1-year CD at 4.9% might beat a 5-year CD at 5.1% if you expect rates to stay elevated.
Breaking a CD early costs you interest — typically 3 months' worth for short-term CDs and up to 12–18 months for 5-year CDs. If you think you might need the money, look for no-penalty CDs (usually offered at slightly lower rates) or keep part of your savings in a high-yield savings account.
CD interest is taxed as ordinary income in the year it's earned — even if the CD hasn't matured yet. Your bank will send a Form 1099-INT for any interest over $10. If you're in the 22% bracket and earn $1,000 of CD interest, you owe about $220. Consider holding CDs inside a Roth IRA to shield that income from taxes entirely.
FDIC Protection
CDs at FDIC-insured banks are protected up to $250,000 per depositor, per institution. Credit union CDs (share certificates) have equivalent coverage through the NCUA. Your principal isn't at risk — that's the fundamental advantage of CDs over market investments.
| Compounding | Periods/yr | APY | End Balance |
|---|---|---|---|
| Annually | 1 | 5.000% | $12,762.82 |
| Semi-annually | 2 | 5.063% | $12,800.85 |
| Quarterly | 4 | 5.095% | $12,820.37 |
| Monthly | 12 | 5.116% | $12,833.59 |
| Daily Best | 365 | 5.127% | $12,840.03 |
Daily compounding earns ~$77 more than annual on $10,000 over 5 years at 5% APR — not life-changing, but every dollar counts when you're saving for a goal.
Authoritative sources for CD rates, FDIC coverage, and compound interest education:
💡 2025–2026 Tip: High-yield online bank CDs are running 4.5–5.5% APY — significantly above the national average of ~1.8%. Always shop beyond your primary bank before locking in a rate.