To calculate a CD early withdrawal penalty, multiply the amount you’re withdrawing by your CD’s daily interest rate, then multiply that by the number of penalty days spelled out in your deposit agreement. Most banks charge somewhere between 90 days and 365 days of simple interest, scaled to the length of the CD term. The formula is the same at almost every bank; only the inputs change.
What You Need From Your Deposit Agreement
Your CD’s deposit agreement, sometimes called the Truth in Savings disclosure, has every number you need. Federal rules require the bank to state upfront how the penalty is calculated and when it applies.1eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD)
Pull four things before you do the math:
- Your principal balance, meaning the amount currently in the CD before any pending interest is credited.
- The nominal annual interest rate, not the APY. The penalty uses simple interest, so the compounding baked into the APY would overstate it.
- The penalty period, expressed as a number of days or months of interest. Look for a line in the agreement worded like “the fee imposed will equal ___ days of interest.”
- Whether the bank calculates penalty days or penalty months. Almost all use days.
The Three-Step Calculation
The idea behind the formula is simple. The bank charges you the interest your money would have earned over the penalty period, and it does that whether or not you’ve actually earned that much yet.
Step 1: Find the Daily Interest Rate
Divide the nominal annual rate by 365, or by 366 in a leap year. For a 4% CD:
0.04 ÷ 365 = 0.00010959
Keep the full decimal. Rounding early will throw off the result.
Step 2: Multiply by the Penalty Days
Take the daily rate and multiply by the number of penalty days in your agreement. Using a 180-day penalty:
0.00010959 × 180 = 0.019726
That figure is the share of your withdrawal the bank will keep.
Step 3: Apply It to Your Withdrawal Amount
Multiply that factor by the dollars you’re pulling out. On a $10,000 withdrawal:
0.019726 × $10,000 = $197.26
On the same CD, a 90-day penalty would cost about $98.63, and a 365-day penalty would run close to $400.
If Your Bank Uses Months Instead of Days
Some agreements state the penalty in months. Divide the annual rate by 12 and multiply by the penalty months. For 4% and a six-month penalty on $10,000:
(0.04 ÷ 12) × 6 × $10,000 = $200.00
The small gap between $197.26 and $200.00 comes from the fact that six calendar months are not exactly 180 days. Use whichever version your agreement specifies.
Typical Penalty Periods by Term Length
Banks tie the penalty period to the length of the CD. Every institution sets its own schedule, but a common pattern looks like this:
- CDs of 12 months or less: 90 days of simple interest.
- CDs longer than 12 months but shorter than 48 months: 180 days of simple interest.
- CDs of 48 months or more: 365 days of simple interest.
Your bank’s schedule may not match these ranges, so run the calculation with the number in your own agreement.
When the Penalty Is Bigger Than the Interest You’ve Earned
Break a CD early enough and the penalty can outrun the interest the account has earned so far. When that happens, the bank takes the shortfall out of your principal, and you get back less than you deposited.2Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID
Say you opened a $10,000 CD two months ago and have earned $66 in interest, but the penalty comes to $197. The bank keeps the $66 of interest and pulls the remaining $131 from your principal. You walk away with $9,869.
Partial withdrawals can change the math. Some banks let you take out part of the balance and charge the penalty only on that piece. Others require you to close the CD entirely if the withdrawal would drop the balance below a minimum, and in that case the penalty applies to the full amount. Check your agreement for a minimum balance rule before requesting a partial withdrawal.
When the Penalty Doesn’t Apply
Federal regulations recognize two situations where a time deposit can be withdrawn early without a penalty: the death of an account owner, and a court determination that the owner is legally incompetent.3eCFR. 12 CFR 204.2 – Definitions Anything else is up to the bank. Some institutions waive the penalty on IRA CDs when the owner takes a required minimum distribution, but that’s a bank policy rather than a federal rule. If you’re dealing with a hardship, it’s worth calling to ask; the bank has discretion to reduce or forgive the charge even when it doesn’t have to.
There’s also the maturity grace period. When a CD reaches its maturity date, the bank must disclose whether it offers a grace period for withdrawals or term changes, and any grace period on an automatically renewing CD has to run at least five calendar days.4eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD) – Section 1030.4(b)(6)(iv)5eCFR. 12 CFR 1030.5 – Subsequent Disclosures Withdraw during that window and no penalty applies. Miss it and the CD rolls into a fresh term with a new penalty schedule attached.
Recovering Part of the Cost at Tax Time
The penalty is deductible on your federal return, and you don’t have to itemize to claim it. The forfeited amount counts as an adjustment to gross income, which lowers your taxable income whether you take the standard deduction or not.6Office of the Law Revision Counsel. 26 USC 62 – Adjusted Gross Income Defined
Your bank reports the penalty in Box 2 of Form 1099-INT for the year of the withdrawal. Box 1 shows the full interest earned; the bank does not net the two figures, so you report each one separately.2Internal Revenue Service. Instructions for Forms 1099-INT and 1099-OID Enter the penalty on Schedule 1 (Form 1040), Line 18, “Penalty on early withdrawal of savings.”7Internal Revenue Service. 2025 Schedule 1 (Form 1040) – Additional Income and Adjustments to Income The Schedule 1 total then feeds Line 10 of Form 1040, reducing adjusted gross income before other deductions or credits are applied.8Internal Revenue Service. Penalty on Early Withdrawal of Savings On the $197.26 penalty above, someone in the 24% bracket would save roughly $46 in federal tax. Not a full offset, but automatic once you enter the number.