Formulas and 2026 figures checked & updated: July 2026
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How to Use the HYSA vs CD Calculator
- Enter your deposit and the two quoted APYs.
- Enter the CD term and when you expect to need the money.
- Enter the bank's early-withdrawal penalty.
- Compare balances and rerun with a lower future HYSA rate.
What This Calculator Does
This tool compares liquidity against a locked rate. A CD may offer more predictable interest, while an HYSA normally permits withdrawals without a CD early-withdrawal penalty.
The result is especially sensitive to whether you hold the CD to maturity and whether the HYSA rate changes.
Formula
Balance = Deposit × (1 + APY)^(Months ÷ 12); early CD penalty = Deposit × CD rate × penalty months ÷ 12Both accounts use their stated APY for the entered holding period. The HYSA rate is assumed constant even though it can change. If withdrawal occurs before the CD term, the specified simple-interest penalty is subtracted, but never below principal in this model. Bank-specific penalties and compounding conventions vary.
Examples
One-year comparison
Compare $20,000 in a 3.75% HYSA with a 4.40% 12-month CD.
Holding to maturity avoids the entered CD penalty; an earlier withdrawal applies it.
Related Calculators
Try another tool to complete the picture
Methodology
Both accounts use their stated APY for the entered holding period. The HYSA rate is assumed constant even though it can change. If withdrawal occurs before the CD term, the specified simple-interest penalty is subtracted, but never below principal in this model. Bank-specific penalties and compounding conventions vary.
Frequently Asked Questions
Is HYSA APY fixed?+
Usually not. Banks can change savings rates at any time. The calculator holds it constant only to make the scenario measurable.
Can a CD penalty reduce principal?+
Some bank disclosures allow penalties that can exceed interest earned, potentially reducing principal. This calculator conservatively floors the modeled CD value at the original deposit; verify the actual disclosure.
Are both accounts FDIC insured?+
Eligible deposit accounts at an FDIC-insured bank are generally insured within legal ownership-category limits. Confirm the institution and your aggregate deposits rather than relying on the product label alone.
Is the HYSA vs CD Calculator exact?+
The arithmetic follows the formula shown on this page, but the result is an estimate because real-world rates, fees, taxes, timing, and provider rules can differ. Use the actual figures from your lender, plan, or agency before making a decision.
Does this calculator store my financial information?+
No. The calculation runs in your browser. Saved results remain in local browser storage and are not submitted as an application or professional financial record.
Can I save my results?+
Yes. Use “Save results” to store a snapshot. Without an account it remains in this browser. If you log in, saved scenarios sync securely to your SmartRates account so they are available on your other devices.
How do I share my calculation?+
Click “Share” in the toolbar to copy a link (or open your device’s share sheet). The link encodes your exact inputs, so whoever opens it sees the calculator pre-filled with the same numbers and the same result.
Can I email my calculator results?+
Yes. Click “Email results” to open your default email application with the current inputs, results, and calculator link already included. Review the message and choose the recipient before sending.
Can I export or print my results as a PDF?+
Yes. Click “Export PDF” to open a clean, printable summary of your inputs and results that you can save as a PDF or print. It includes a timestamp and a link back to the calculator.
How accurate are the calculator results?+
The arithmetic follows the formula and assumptions documented on this page. The result is still an estimate because actual rates, fees, taxes, timing conventions, eligibility rules, and provider calculations can differ. Use figures from your official quote, statement, contract, or tax form before making a financial decision.
Which inputs have the biggest effect on the result?+
Rate, time, starting balance, recurring payments or contributions, and fees usually have the largest effects. Change one input at a time to create a conservative, expected, and optimistic scenario instead of relying on a single forecast.
Are taxes, fees, and inflation included?+
Only when they appear as an input or are explicitly described in the methodology. Do not assume an omitted cost is zero. Review the formula and methodology sections to see exactly what is included before comparing the result with an outside quote.
Can this calculator predict future rates or returns?+
No. A calculator projects the assumptions entered; it cannot predict market returns, inflation, variable interest rates, tax-law changes, or provider decisions. Rerun the calculation with several assumptions to understand the range of possible outcomes.
Why might my lender, bank, broker, or tax software show a different result?+
Professional systems may use daily timing, transaction dates, compounding conventions, rounding rules, account-specific fees, credits, eligibility details, or regulations that a general-purpose calculator cannot know. A small difference can be rounding; a large difference usually means an assumption or included cost is different.
Disclaimer: Calculations are for informational purposes only and do not constitute professional financial advice. Please consult with a certified professional before making financial decisions.