CD early withdrawal penalties: the real math
A higher CD rate is only useful if you hold to maturity — or if the break-even still works after the penalty clause.
How penalties are written
Typical language: “90 days of interest” on a 12-month CD, or “180 days of interest” on a multi-year CD. Because the penalty is based on interest, a high APY produces a larger absolute penalty than a low APY with the same day count — which surprises people who only compare rates.
Some disclosures use a 360-day year or forfeit more than accrued interest. Never rely on a third-party model without reading the PDF you signed.
Break-even framing
Ask how many months you must hold before the extra yield versus a liquid HYSA exceeds the expected penalty if life changes. If your true horizon is shorter than that break-even, the liquid product often wins even at a lower APY.
RungRate’s penalty tool multiplies principal × APY × (penalty days / 365) and compares to interest accrued over days already held. It is a planning sketch, not a bank payoff quote.
Ladder interaction
CD ladders reduce the chance you must break the entire balance. Only one rung is at risk if you need cash early. That is a structural reason ladders exist beyond yield chasing.
On this wire
General information, not personalized advice.