Penalty cliff, remaining-term growth, and after-tax alternative-yield break-evenLive current inputs
Finance & Money
Certificate of Deposit Payoff Calculator
Compare breaking a CD now with holding to maturity using accrued interest, penalty, tax, and alternative yield.
Net cash from breaking CD—
Early-withdrawal penalty—
After-tax value at maturity—
After-tax value after switching now—
Hold-versus-switch advantage—
Break-even after-tax alternative APY—
Interest accrued to date—
Modeled decision—
Early-withdrawal decision boundary
Penalty cliff, remaining-term growth, and after-tax alternative-yield break-even
A boundary curve shows the after-tax alternative APY required to overcome the penalty and lost CD growth under the same entered tax assumption.
Live decision table
After-tax hold-versus-break scorecard
Compare current cash, after-tax maturity values, penalty, and sensitivity to alternative yields on one tax basis.
| Alternative APY | Cash available now | After-tax value at maturity | Difference vs hold | Decision |
|---|
Cash-flow schedule
Annual and monthly cash-flow schedule
How to use
Enter the certificate terms and compare at one date
- Use current account or security documents.
- Keep rates, timing, taxes, and cash flows explicit.
- Change one assumption at a time.
- Compare the result with a practical liquidity need.
Calculation logic
Early liquidity has a penalty and a reinvestment value
Comparing cash today with maturity cash directly is invalid; both paths are carried to the same future date and use the same entered tax assumption.
The live table preserves intermediate values instead of reducing the decision to one headline number.
Calculation method
Value the same cash at the same maturity date under hold and break scenarios
Both choices are measured at the original maturity date and use the same entered tax rate on interest. A numerical solver finds the after-tax outside yield that exactly offsets the withdrawal penalty.
Detailed calculation process and general formulas
I_h=P[(1+APY)^(h/12)-1]Penalty=P·APY·m_p/12Cash_now=P+I_h-Penalty-I_hτV_hold=P+[P(1+APY)^((h+r)/12)-P](1-τ)V_switch=Cash_now+[Cash_now(1+y)^(r/12)-Cash_now](1-τ)Symbols, meanings, and units
- P
- original CD principalcurrency
- h
- months already heldmonths
- r
- months remainingmonths
- m_p
- penalty interest monthsmonths
- τ
- entered tax rate on interestdecimal
- y
- alternative annual yielddecimal/year
The live substitution below follows formula order and reconciles the current result with the decision table and visual.
Decision audit
Check constraints the arithmetic cannot guarantee
- Confirm contractual dates and penalties.
- Stress rates and reinvestment assumptions.
- Separate taxable and protected accounts.
- Preserve emergency liquidity.
Decision anatomy
What moves the break-even yield
The diagnostic cards isolate the drivers most likely to change the decision.
Penalty cliff
—Interest forfeited on early withdrawal.
Hold advantage
—After-tax maturity-value difference under the entered outside yield.
Break-even yield
—After-tax alternative APY needed to match holding.
Decision takeaway: Break a CD for liquidity need, not merely because another headline rate looks higher.
Practical applications
Decisions this calculator is designed to support
Emergency cash need
A depositor may need funds before maturity.
What the result clarifies: The cash-now result makes the actual accessible amount explicit.
Rate-shopping decision
A new CD offers a higher APY but the old CD charges a penalty.
What the result clarifies: The boundary tests whether the rate gain recovers the penalty.
Worked example
Current-input substitution and reconciliation
Important note
Actual penalty formulas, accrued-interest treatment, taxes, market value, and brokered-CD liquidity vary by institution.
Certificate of Deposit Payoff Calculator FAQ
Can the penalty exceed accrued interest?
Some contracts can invade principal; confirm the disclosure.
Why compare at original maturity?
It creates a common date for both choices.
Does the model include new-CD penalties?
No. The alternative path only models its entered yield.