10 Month CD Calculator

What a 10 month CD pays

A 10 month CD locks one rate for one fixed stretch, about 304 days, and pays the quoted APY across it. The math is short: the interest is the deposit times the APY times 10 divided by 12, because the APY is a full year figure and the CD holds the money for ten months of it. On 10,000 dollars at 4.40 percent APY, the term earns 366.67 dollars, the balance at maturity is 10,366.67 dollars, and each of the ten months adds 36.67 dollars. The yield over the term is 3.67 percent, which is what 4.40 percent a year comes to when you hold it five sixths of a year.

The calculator does that arithmetic plus the exit math savers need most: the early withdrawal penalty, the net if you close in a given month, and the month where the penalty stops eating the interest. Type in your own deposit, APY and penalty terms and the table updates; a start date turns the term into a real maturity date you can put on a calendar, so March 31 plus 10 months lands on January 31 of the next year.

Where the 4.40 percent example rate comes from

The 4.40 percent APY used in every example on this page is an example rate, not a live quote. It matches the 10 month CD American Express had listed in late October 2026, and it sits in the band where odd term certificates were priced that fall. For context from an official source: the FDIC's national rates table put the 12 month CD national average at 1.76 percent as of October 19, 2026, with the 6 month at 1.39 percent and the 24 month at 1.55 percent. Those national averages cover every bank in the country, including the ones paying near zero, so competitive online offers run well above them; the gap between the 1.76 percent average and a 4.40 percent offer is the market, not a typo.

Check the APY field against whatever your bank prints, because the whole table moves with it. Every figure on this page scales the same way: double the APY and the interest doubles, halve the deposit and every dollar figure halves.

Why a bank sells a 10 month term at all

Odd terms exist because banks manage their own funding calendars, not because 10 months is a magic number for savers. A bank that expects deposits or loan demand to shift around a certain season can offer a certificate that matures right where it wants new pricing, and 7, 10, 11 and 13 month offers show up in promotional lineups for that reason. For the saver, the odd term is a tool: money you need at a specific season, tuition in September, a down payment you expect to use before a year, fits a 10 month certificate better than a 12 month one.

The regulator side treats 10 months as what it calls an off tenor maturity. The FDIC publishes national rates and rate caps only for standard lengths, 1, 3, 6, 12, 24, 36, 48 and 60 months, and its rules say a bank offering an off tenor product uses the next lower on tenor maturity, the 6 month rate here, when it computes the applicable cap. That is why the table in the last section has no 10 month row: the FDIC national rates page explains the rule in its footnotes. In practice the 10 month quote you see usually sits between the 6 and 12 month figures from the same bank, closer to whichever one the bank wants to promote.

Worked example: closing early with a 3 month penalty

Most US account agreements measure the early withdrawal penalty in months of interest on the full deposit, and 3 months is the common size for terms under a year. On 10,000 dollars at 4.40 percent, one month pays 36.67 dollars, so the penalty is 110.00 dollars. Suppose you close in month 5. Interest accrued by then is 183.33 dollars, the penalty takes 110.00, and the account returns 10,073.33 dollars, which is 73.33 dollars of earned interest kept and 293.33 dollars of the term's interest given up against holding to maturity.

Now flip the terms. A 6 month penalty on the same deposit is 220.00 dollars, and closing in month 4 means only 146.67 dollars of interest accrued, so the bank claws back 73.33 dollars of your own deposit and returns 9,926.67 dollars. The penalty size is set by the account agreement, and the exit month is set by you, which is why the calculator asks for both. The message line under the table does the division for you: the penalty is covered once the months accrued reach the penalty months, month 3 on the 3 month case, month 6 on the 6 month case. Before that month, an early exit costs principal; after it, the exit still leaves a gain.

10 months against the neighbors: 6 and 12

The 10 month term competes with two standard lengths, and the trade is liquidity against rate. Take 10,000 dollars at the same 4.40 percent APY on every rung, which is roughly what a flat promotional curve looks like. Six months earns 220.00 dollars and frees the money twice as soon, twelve months earns 528.00 dollars, and ten months earns 366.67 dollars. The 10 month certificate gives up 161.33 dollars against the 12 month run to buy two months of earlier access, and it beats the 6 month run by 146.67 dollars if the money can wait the extra four months. Whether that trade makes sense depends on when you need the money, not on the annualized rate, which is nearly identical across all three.

The other edge case is renewal. At maturity the bank moves the balance into whatever the current offer is, usually with a grace window of about a week to make a change, and the CFPB's certificate of deposit explainer walks through the renewal mechanics. A 10 month CD that matures in September gets repriced at whatever September offers, which can be better or worse than the rate a 12 month CD locked in November. A certificate that matures before you need the money just moves the problem; one that matures after is the one that costs a penalty.

Insurance, taxes and the deposit size

FDIC insurance covers 250,000 dollars per depositor, per bank, per ownership category, and the calculator prints the headroom on whatever deposit you enter. A 10,000 dollar certificate sits 240,000 dollars inside the line; a 300,000 dollar certificate leaves 50,000 dollars exposed at that bank, and splitting it across a second bank restores full coverage. Credit union share certificates carry the same 250,000 dollar limit through NCUA insurance. Insurance attaches to the balance including accrued interest, so a CD left to roll over for years can creep past the line; the FDIC's deposit insurance page has the ownership category rules that decide how the limit applies.

Interest from a CD is taxable income in the year the bank credits it, and a 10 month certificate usually lands all of its interest in one tax year, which makes the paperwork simpler than a multiyear term that reports a slice each year. At a 22 percent federal rate, the 366.67 dollars of interest on the example CD costs about 80.67 dollars in federal tax, leaving roughly 286.00 after tax. The calculator leaves tax out of its table so the quoted figures match the bank's, and state tax applies on top where your state levies it.

How to use this page next to the generic CD calculators

The CD calculator answers the general question, what does any deposit at any rate for any term pay, and it compounds the interest on a schedule you pick. This page answers the questions a 10 month term raises: the exit math, the penalty break even month, the maturity date on a calendar, and the insurance headroom. Use this one to decide whether a specific 10 month offer fits your calendar, and the general one to compare that offer against a 12 or 18 month alternative at a different rate, since those terms sit at different points on a real curve.

Three figures from your own paperwork replace the defaults and make the table exact: the APY on the offer sheet, the penalty in months of interest from the account agreement, and the date you plan to open. Everything else on the page is arithmetic. One habit worth keeping: rerun the numbers in the grace period at maturity, because the renewal rate the bank applies automatically is rarely the best rate it offers that week, and a 10 month CD that you never re-examine at maturity is a rate decision made by default.