A CD early withdrawal penalty is calculated as principal × annual interest rate × (penalty months ÷ 12). Break a $10,000 CD paying 4.50% with a 6-month interest penalty and the cost is $10,000 × 0.045 × (6 ÷ 12) = $225. The penalty is a fixed number of months of interest tied to your CD's term, not a percentage of your balance, and the bank charges it whether or not you have actually earned that much interest yet. Run your own numbers with our free CD calculator before you break anything.
That one formula answers most of the question, but the details swing the dollars. The number of penalty months rises with the CD term, the rate used is almost always the CD's own stated rate, and on a brand-new long-term CD the penalty can exceed the interest you have earned, which means it bites into your original deposit. Below is the exact math, the typical penalty schedules, a full example of breaking a 5-year CD after 18 months, and a clear rule for when breaking a CD to chase a higher rate actually pays off.
The CD early withdrawal penalty formula
Banks express the early withdrawal penalty (EWP) as a set number of months of interest, not a flat fee or a percentage of your balance. To turn "months of interest" into a dollar figure, use this:
Penalty = Principal × Annual Rate × (Penalty Months ÷ 12)
- Principal is the amount withdrawn early, often your full deposit. Some banks allow a partial withdrawal and penalize only that slice.
- Annual Rate is the CD's stated rate as a decimal. A 4.50% CD uses 0.045. Most banks apply the rate the CD is actually earning, not a separate penalty rate.
- Penalty Months is the bank's disclosed figure: 90 days (3 months), 180 days (6 months), or 365 days (12 months) are the common ones.
Here is what the formula really tells you: the penalty is fixed by your term the day you open the CD. It does not shrink as maturity approaches, and it does not depend on how much interest you have earned so far. Break a 5-year CD with a 365-day penalty after one month or after four years, and the dollar penalty is identical. So timing is everything. The penalty hurts most when you have earned the least.
Typical CD penalty schedules by term
There is no single legal standard for penalty size, so each bank writes its own schedule. The industry has settled into a familiar pattern: longer terms carry steeper penalties because the bank is counting on your money staying put. Here is a representative 2026 schedule, with the dollar cost on a $10,000 CD earning 4.50%.
| CD term | Typical penalty | Penalty months | Penalty on $10,000 at 4.50% |
|---|---|---|---|
| 3 to 11 months | 90 days of interest | 3 | $112.50 |
| 1 year | 90 to 180 days of interest | 3 to 6 | $112.50 to $225.00 |
| 2 to 3 years | 180 days of interest | 6 | $225.00 |
| 4 to 5 years | 365 days of interest | 12 | $450.00 |
| Over 5 years | 365 to 540 days of interest | 12 to 18 | $450.00 to $675.00 |
These are common ranges, not guarantees. Some online banks are gentler (a flat 90 days on every term); a few are harsher (18 months of interest on long CDs). Two things never change: read the penalty in the CD's disclosure box before you sign, and remember that the dollar penalty is locked the moment you open the account.
Worked example: breaking a $10,000 5-year CD after 18 months
Run the full math on a realistic case. You opened a $10,000 5-year CD at 4.50% APY. Eighteen months in, you need the cash. The CD carries a 180-day (6-month) early withdrawal penalty.
Step 1: Find the balance you've built
After 18 months (1.5 years) of compounding at 4.50%, the account is worth about:
$10,000 × (1 + 0.045)1.5 = $10,682.54
So you have earned roughly $682.54 in interest so far.
Step 2: Calculate the penalty
Apply the formula with 6 penalty months:
Penalty = $10,000 × 0.045 × (6 ÷ 12) = $225.00
Step 3: Subtract the penalty
The bank deducts the $225 penalty from your interest:
- Interest earned: $682.54
- Less penalty: −$225.00
- Net interest kept: $457.54
- Cash you walk away with: $10,000 + $457.54 = $10,457.54
Here you still come out ahead, because the interest earned ($682.54) is far larger than the penalty ($225). The penalty stings, but it never touches your original $10,000. That is the usual outcome when you break a CD that has been earning for a while.
When the penalty eats into your principal
The outcome flips when you break a long-term CD early in its life, before it has earned enough interest to absorb the penalty. Open a $25,000 5-year CD at 4.10% with a 365-day (12-month) penalty, then cash out after just 2 months:
- Interest earned in 2 months: about $168
- Penalty (12 months of interest): $25,000 × 0.041 × (12 ÷ 12) = $1,025
- Cash returned: $25,000 + $168 − $1,025 ≈ $24,143
You get back less than your original deposit. The penalty wiped out all your interest and clawed back roughly $857 of principal. This is legal and disclosed, and it is the single biggest trap with long CDs. Federal rules require a minimum penalty of seven days of simple interest if you withdraw within the first six days after deposit, but beyond that, banks are free to design penalties that dip into principal. The lesson is simple: never lock money you might need into a long CD with a 12-month penalty. Keep that cash liquid, and use our emergency fund calculator to size the buffer you should hold outside any CD.
Is it worth breaking a CD? The reinvestment decision rule
Sometimes breaking a CD is the smart move, especially if rates have climbed and you can reinvest meaningfully higher. The question is whether the extra yield on a new CD beats the penalty you pay to escape the old one. The rule:
Break and reinvest only if the extra interest you'll earn over the remaining term is larger than the penalty.
The break-even check
A quick test: divide the penalty by the extra interest the higher rate earns in one year. That gives the number of months it takes to recover the penalty.
Say you hold $10,000 in a 4.50% CD with a 6-month penalty ($225), and a fresh CD now pays 5.50%. The rate gain is 1.00 percentage point, worth about $100 a year on $10,000.
Months to recover the penalty = ($225 ÷ $100) × 12 = 27 months
So breaking only wins if more than 27 months remain before the new CD matures. With less time than that, you pay the penalty but never fully recoup it.
Full worked comparison
Back to the 5-year 4.50% CD, broken at 18 months with a $225 penalty. You have 3.5 years (42 months) of term remaining, and you can reinvest at 5.50%. In the break path, the bank takes the $225 penalty out of your $10,682.54 payout, leaving $10,457.54 to reinvest. Compare both paths over the next 3.5 years:
| Path | Rate for next 3.5 years | Penalty handling | Balance in 3.5 years |
|---|---|---|---|
| Keep the old CD | 4.50% | None | $12,461.82 |
| Break and reinvest | 5.50% | $225 taken from payout | $12,612.84 |
Breaking leaves you with about $151 more after 3.5 years, even after the $225 penalty is deducted up front. Because you have plenty of time left (42 months, well above the 27-month break-even), the higher rate wins. If only 12 months remained instead, the extra yield could not cover the penalty and you would be better off holding to maturity.
Model this yourself in the CD calculator by running the old rate and the new rate over your remaining term, then subtract the penalty from the "break" path before you compare. For a wider view, the savings calculator stacks a high-yield savings account against any CD on the same deposit.
How to estimate your own CD penalty in four steps
You can compute any CD penalty in under a minute once the disclosure is in front of you.
- Find the penalty months. Look in the CD disclosure for language like "90 days of interest" (3 months) or "365 days of interest" (12 months).
- Note your rate and principal. Use the CD's stated annual rate as a decimal and the amount you plan to withdraw.
- Apply the formula. Penalty = Principal × Rate × (Penalty Months ÷ 12).
- Compare to interest earned. If the penalty is bigger than the interest you've earned so far, breaking the CD costs you principal.
A few practical notes. The penalty is charged on the amount withdrawn, so a partial withdrawal (where allowed) carries a smaller penalty. The penalty is not a tax deduction in the everyday sense, but you can subtract it from the taxable interest you report, which softens the blow slightly. And your principal stays protected by federal deposit insurance regardless of the penalty: every dollar at an FDIC-insured bank is covered up to $250,000 per depositor, per bank.
Smarter ways to avoid the penalty entirely
The cleanest way to win the penalty game is to never trigger one. Three tactics do most of the work:
- Build a CD ladder. Splitting your money across CDs that mature at staggered intervals means a portion is always coming due soon, so you rarely need to break one. Our step-by-step guide on how to build a CD ladder shows the exact structure.
- Keep a real emergency fund liquid. Only lock money you are confident you won't touch. Cash you might need belongs in a high-yield savings account, not a CD.
- Match the term to your timeline. If you'll need the money in 14 months, buy a 12-month CD, not a 5-year one with a punishing penalty.
Used this way, the penalty becomes a rare event rather than a routine cost. And when breaking a CD genuinely makes sense, you now have the formula and the break-even rule to prove it in dollars rather than guessing.
Want the answer without the arithmetic? Open the free CD calculator, enter your deposit, rate, and term, and model keeping versus breaking your CD side by side so you can see the net benefit before you call the bank.
Try it yourself
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Open the CD Calculator →Frequently asked questions
- How is a CD early withdrawal penalty calculated?
- A CD early withdrawal penalty equals principal x annual rate x (penalty months / 12). The penalty is a fixed number of months of interest based on your CD's term. For a $10,000 CD at 4.50% with a 6-month penalty, the cost is $10,000 x 0.045 x 0.5 = $225. The dollar amount is locked when you open the CD and does not change as maturity nears.
- How many months of interest is a typical CD penalty?
- Typical CD penalties run about 3 months of interest (90 days) on short terms, 6 months on 1-to-3-year CDs, and 12 months (365 days) on 4-to-5-year CDs. A few banks charge up to 18 months on terms over five years. Always check your CD's disclosure box, since each bank sets its own schedule and there is no single legal standard.
- Can a CD early withdrawal penalty take my principal?
- Yes. If the penalty is larger than the interest you have earned, the bank deducts the shortfall from your original deposit. This happens most on long-term CDs cashed out early, when little interest has accrued. For example, breaking a $25,000 5-year CD with a 12-month penalty after two months could return only about $24,143, less than you deposited.
- Is it worth breaking a CD to get a higher rate?
- Breaking a CD is worth it only when the extra interest from the new, higher rate exceeds the penalty over your remaining term. Divide the penalty by the annual rate gain to find the break-even months. If a $225 penalty buys you $100 more interest per year, you need more than 27 months remaining for breaking to pay off.
- What rate does the bank use to calculate the penalty?
- Most banks calculate the penalty using the CD's own stated interest rate, the rate the account is currently earning. A few institutions apply a separate penalty rate or the rate in effect at withdrawal, but the standard practice is your contract rate. Check the disclosure, because a different rate changes the dollar penalty proportionally.
- How do I calculate a CD penalty without a calculator?
- Multiply your principal by the annual rate, then multiply by the penalty months divided by 12. For a $10,000 CD at 5% with a 6-month penalty: $10,000 x 0.05 = $500 of annual interest, then $500 x (6 / 12) = $250 penalty. A free CD penalty calculator does this instantly and also compares keeping versus breaking the CD.
- Does the CD penalty get smaller as maturity approaches?
- No. The penalty is a fixed number of months of interest set when you open the CD, so it stays the same dollar amount whether you withdraw in month one or month forty-eight. What changes is your earned interest: the longer you wait, the more interest you have to absorb the penalty, so the penalty hurts least near maturity.
- Is a CD early withdrawal penalty tax deductible?
- You can reduce your taxable interest income by the penalty amount. CD interest is reported as ordinary income, and the early withdrawal penalty is reported as an adjustment that lowers the interest you owe tax on. This does not erase the penalty, but it softens the net cost. Confirm the current treatment with a tax professional for your situation.
- What happens if I withdraw a CD within the first week?
- Federal rules require a minimum penalty of seven days of simple interest if you withdraw within the first six days after opening or after a partial withdrawal. Beyond that grace window, the bank's standard penalty schedule applies, which can be 3, 6, or 12 months of interest and may dip into your principal on long-term CDs.
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