CD vs High-Yield Savings (HYSA) Calculator
Compare a fixed-rate certificate of deposit with a high-yield savings account whose rate can fall — including rate-cut scenarios, monthly deposits, and what you'd net if you broke the CD early.
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Fixed CD
- Liquidity
- —
- Rate risk
- None until maturity
- Extra deposits
- Go to savings
Floating HYSA
- Liquidity
- Instant access
- Average APY
- —
- Extra deposits
- Any time
Balance Divergence (initial deposit)
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Month-by-Month Comparison
Initial deposit only (monthly deposits earn the same in both strategies). "If broken" is the CD balance after the early withdrawal penalty.
| Month | CD Balance | HYSA APY | HYSA Balance | CD Advantage | CD If Broken | Status |
|---|
Reinvestment Risk: Why Locking a Rate Can Pay
A high-yield savings rate is variable — banks usually cut it soon after the Federal Reserve lowers interest rates. A CD locks today's rate for the whole term, so if rates fall, the CD keeps paying the higher rate. If rates rise instead, the savings account catches up and the CD falls behind.
The Barbell: Split Your Cash
You don't have to choose one. A common approach keeps an emergency fund — often 3 to 6 months of essential expenses — in a high-yield savings account for instant access, and puts money you won't need soon into CDs, often laddered so one matures every few months.
How this comparison works
The CD grows at its fixed APY for the full term. The savings account starts at its current APY and, depending on the rate path you pick, declines steadily each month (never below zero). Both balances compound monthly using the APY. Monthly deposits go into savings in both strategies — a CD can't accept new money — so they don't change which option wins on your initial deposit.
The early withdrawal penalty is modeled as the chosen number of days of simple interest at the CD rate on the deposit. Banks' exact penalty rules differ, and some can take principal if you break a CD very early.
By Suhaib Hassan · Formula verified 27 Sep 2026 · How CalculatePilot verifies formulas →
Frequently asked questions
Is a CD or a high-yield savings account better?
A CD usually wins if you won't need the money before it matures and rates fall or stay flat. A high-yield savings account wins if you may need the money, or if rates rise during the term. Many savers use both.
What happens if I withdraw from a CD early?
You pay an early withdrawal penalty, commonly a set number of days or months of interest. If you break the CD early enough, the penalty can exceed the interest earned and reduce your principal.
Do high-yield savings account rates change?
Yes. HYSA rates are variable and banks can change them at any time, typically following moves in the Federal Reserve's policy rate.
Are CDs and high-yield savings accounts insured?
At FDIC-insured banks, both are covered up to $250,000 per depositor, per bank, per ownership category. Credit union accounts have equivalent NCUA coverage.
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