How it works
A CD early-withdrawal penalty is almost universally quoted in months of interest — commonly three to six months on short terms and twelve or more on long ones — charged as simple interest on principal regardless of how long the CD has run. The calculator applies that standard structure: monthly interest equals deposit times APY divided by twelve, the penalty is that figure times the penalty months, and net proceeds are principal plus interest earned minus the penalty. On the defaults — $25,000 at 4.3%, twenty-four-month term, four-month penalty, broken at month ten — earned interest totals about $896 while the penalty removes $358, keeping roughly $538 of the earnings and all of the principal. The strategic column answers the real question: does breaking beat holding? Proceeds reinvested at an alternative rate compound over the remaining term against what the untouched CD would reach at maturity; here, moving to a 4% savings account trails the original CD by several hundred dollars, quantifying exactly when patience pays. Two rules of thumb emerge from the math. Never break for a rate improvement smaller than the penalty drag — the bar is usually half a percentage point or more — and never break for emergencies that a properly sized emergency fund should have absorbed, because penalties punish precisely the liquidity CDs were never meant to provide.
Formula
Penalty = deposit × (APY ÷ 12) × penalty months | Net = principal + interest earned − penalty
Tips
- Read the truth-in-savings disclosure — penalty months are stated there before you buy.
- Never break for rate gains smaller than the penalty's annualized drag (often 0.5%+).
- Ask about partial withdrawals — some banks penalize only the amount withdrawn.
- At maturity use the grace window (usually 7–10 days) to exit penalty-free.
- No-penalty CDs exist for money that might need earlier access — pay slightly less yield for optionality.
Frequently asked questions
- How is a CD early withdrawal penalty calculated?
- Almost always as months of simple interest on principal: deposit × APY ÷ 12 × penalty months. A $25,000 CD at 4.3% with a four-month penalty costs about $358 whether closed at month two or month twenty-two — the fee does not shrink as the term progresses, which surprises many savers.
- What is the typical penalty on a 12-month CD?
- Three to six months of interest is standard, varying by institution. On $25,000 at 4.3%, three months runs about $269. Long-term CDs escalate — five-year products frequently charge twelve months of interest, roughly $1,075 on the same balance, making short-CD breaks proportionally cheaper.
- Can a CD early withdrawal penalty exceed interest earned?
- Yes — close a long-term CD early enough and the penalty wipes out every cent of accrued interest and can even dip toward principal. A twelve-month-penalty product closed at month one forfeits roughly eleven times the interest earned. The calculator's percentage output flags this zone explicitly.
- When does breaking a CD make sense?
- When new rates exceed your old rate by more than the penalty's amortized drag — roughly, when the yield gap times remaining months beats the fixed penalty — or for genuine emergencies exceeding other liquidity. For small gaps the math almost always favors holding; verify with the hold-versus-break comparison above.
- Do CD penalties apply at maturity?
- No. At maturity the CD enters a grace window, typically seven to ten days, during which funds move freely without penalty. Miss it and the bank automatically renews at current rates, restarting both the term and its penalty clock — calendar the maturity date rather than trusting renewal notices.