How much does a $10,000 CD earn in a year?

The APY times the deposit: at 4.5 percent APY, $450, for a balance of $10,450 at maturity. Because APY includes compounding by definition, the quoted number is exactly what a 12-month CD delivers, which makes rate shopping a straight comparison.

What is the difference between a CD and a high-yield savings account?

A CD locks the rate and the money for the term; a savings account keeps both flexible. CDs usually pay a little more in exchange for the lock, and their rate cannot fall mid-term the way a savings APY can. If there is any real chance you need the cash, the savings account's penalty-free access usually wins.

What happens if I withdraw a CD early?

You pay the bank's early withdrawal penalty, commonly three to twelve months of interest depending on the term. On a CD held only briefly, the penalty can exceed the interest earned and dip into principal. Some banks sell no-penalty CDs that trade a lower APY for an escape hatch.

Is CD interest taxed before maturity?

Yes. Interest is taxable as ordinary income in the year the bank credits it, reported on a 1099-INT, even on a multi-year CD you cannot touch yet. That timing surprises people on long CDs; holding CDs inside an IRA sidesteps it.

Splitting your money across staggered terms, say 12, 24, and 36 months, so a CD matures regularly. Each maturity gives you a choice: spend, or re-lock at the current long-term rate. It smooths reinvestment risk and keeps part of your money reachable without penalties.

CD Calculator

See what a certificate of deposit earns: enter the deposit, APY, and term to get the ending balance, total interest, and month-by-month growth.

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Balance at maturity

$10,450.00

Interest earned: $450.00
Total return over the term: 4.50%

CD balance by month

Quick answer: With the example inputs this page loads by default, the headline result (Balance at maturity) comes to $10,450.00. See what a certificate of deposit earns: enter the deposit, APY, and term to get the ending balance, total interest, and month-by-month growth. Change any input above and every figure updates instantly in your browser.

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A certificate of deposit locks your money at a fixed APY for a set term, and the math is clean: the deposit grows at the quoted APY, compounded, until maturity. A $10,000 CD at 4.5 percent APY returns $10,450 after 12 months and $12,461.82 after five years. This calculator shows the ending balance, the interest, and the growth month by month.

What this result means

Because APY already includes compounding, comparing CDs is just comparing APYs for the same term; the only other lever is the term itself. The real decision is liquidity: a CD beats a savings account only if you can leave the money untouched, since early withdrawal typically forfeits several months of interest. Compare the quoted CD rate against a high-yield savings APY you can access anytime, and against Treasury yields for the same term, which are exempt from state income tax. This is an estimate, not investment advice.

Assumptions

The deposit grows at the exact monthly rate that reproduces the quoted APY, so a 12-month term earns precisely the APY. Because APY is defined to include compounding (Regulation DD, the Truth in Savings Act), the bank's internal compounding frequency does not change the result.
The APY is fixed for the whole term, the defining feature of a CD, and interest is left in the CD to compound rather than paid out.
No early withdrawal is modeled. Withdrawing before maturity typically forfeits a penalty of several months of interest, set by each bank's disclosure, which can eat into principal on a young CD.
Taxes are not modeled: CD interest is taxable as ordinary income in the year it is credited, even though you cannot spend it until maturity.
FDIC or NCUA insurance covers deposits up to $250,000 per depositor, per institution, per ownership category; amounts above that carry bank risk this calculator does not model.
This is an estimate for educational purposes only, not investment advice.

Key terms

Definitions for the terms this calculator uses, in our finance glossary .

How it works

APY does the heavy lifting. Under the Truth in Savings Act (Regulation DD), a bank’s quoted annual percentage yield must already include the effect of its compounding schedule, so two CDs with the same APY pay the same regardless of whether one compounds daily and the other monthly.

That makes the math one formula: the deposit grows at the exact monthly rate that reproduces the APY, (1 + APY)^(1/12) - 1, for the number of months in the term. Equivalently, the balance at maturity is deposit x (1 + APY)^(months / 12). A 12-month CD therefore earns exactly its APY, and shorter or longer terms scale by the fractional exponent. The same convention drives the site’s high-yield savings calculator, so the two tools are directly comparable.

Worked example

$10,000 at 4.5 percent APY.

12 months: $10,000 x 1.045 = $10,450 ($450 of interest, exactly the APY).
6 months: $10,000 x 1.045^(1/2) = $10,222.52.
60 months: $10,000 x 1.045^5 = $12,461.82, a 24.62 percent total return over the term.

Scope and limitations

A fixed APY held to maturity with interest left to compound. Not modeled: early withdrawal penalties (typically several months of interest, per the bank’s disclosure), interest paid out rather than compounded, variable or bump-up CDs, taxes (CD interest is ordinary income in the year credited), and FDIC/NCUA insurance limits ($250,000 per depositor, per institution, per ownership category). This is an estimate for education, not investment advice.

Sources

Frequently asked questions

How much does a $10,000 CD earn in a year?: The APY times the deposit: at 4.5 percent APY, $450, for a balance of $10,450 at maturity. Because APY includes compounding by definition, the quoted number is exactly what a 12-month CD delivers, which makes rate shopping a straight comparison.
What is the difference between a CD and a high-yield savings account?: A CD locks the rate and the money for the term; a savings account keeps both flexible. CDs usually pay a little more in exchange for the lock, and their rate cannot fall mid-term the way a savings APY can. If there is any real chance you need the cash, the savings account's penalty-free access usually wins.
What happens if I withdraw a CD early?: You pay the bank's early withdrawal penalty, commonly three to twelve months of interest depending on the term. On a CD held only briefly, the penalty can exceed the interest earned and dip into principal. Some banks sell no-penalty CDs that trade a lower APY for an escape hatch.
Is CD interest taxed before maturity?: Yes. Interest is taxable as ordinary income in the year the bank credits it, reported on a 1099-INT, even on a multi-year CD you cannot touch yet. That timing surprises people on long CDs; holding CDs inside an IRA sidesteps it.
What is a CD ladder?: Splitting your money across staggered terms, say 12, 24, and 36 months, so a CD matures regularly. Each maturity gives you a choice: spend, or re-lock at the current long-term rate. It smooths reinvestment risk and keeps part of your money reachable without penalties.

Related calculators

Learn how this works

New to this topic? Our companion guide explains it in plain language: CD or High-Yield Savings? When Locking Your Rate Actually Wins

By Sam Sage Last reviewed July 2026.