CD Calculator

The Certificate of Deposit (CD) Calculator can help determine accumulated interest earnings on CDs over time. Included are considerations for tax and inflation for more accurate results.

Initial Deposit
Interest Rate
Deposit Length
Marginal Tax Rate
Inflation Rate


End Balance$5,788.13
After Inflation Adjustment$5,296.95
Total Principal$5,000.00
Total Interest$788.13
Balance Accumulation Graph

RelatedInvestment Calculator | Interest Calculator

What is a Certificate of Deposit?

A certificate of deposit is an agreement to deposit money for a fixed period that will pay interest. Common term lengths range from three months to five years. The lengthier the term, the higher the exposure to interest rate risk. Generally, the larger the initial deposit, or the longer the investment period, the higher the interest rate. As a type of investment, CDs fall on the low-risk, low-return end of the spectrum. Historically, interest rates of CDs tend to be higher than rates of savings accounts and money markets, but lower than the historical average return rate of equities. There are also different types of CDs with varying rates of interest, or rates linked to indexes of various kinds, but the calculator can only do calculations based on fixed rate CDs.

The gains from CDs are taxable as income in the US unless they are in accounts that are tax-deferred or tax-free, such as an IRA or Roth IRA. For more information about or to do calculations involving a traditional IRA or Roth IRA, please visit the IRA Calculator or Roth IRA Calculator.

CDs are called "certificates of deposit" because before electronic transfers were invented, buyers of CDs were issued certificates in exchange for their deposits as a way for financial institutions to keep track of buyers of their CDs. Receiving actual certificates for making deposits is no longer practiced today, as transactions are done electronically.


One of the defining characteristics of CDs in the US is that they are protected by the Federal Deposit Insurance Corporation (FDIC). CDs that originate from FDIC-insured banks are insured for up to $250,000, meaning that if banks fail, up to $250,000 of each depositors' funds is guaranteed to be safe. Anyone who wishes to deposit more than the $250,000 limit and wants all of it to be FDIC-insured can simply buy CDs from other FDIC-insured banks. Due to this insurance, there are few lower risk investments. Similarly, credit unions are covered by insurance from the National Credit Union Administration (NCUA insurance), which provides essentially the same insurance coverage on deposits as the FDIC.

Where and How to Purchase CDs

CDs are typically offered by many financial institutions (including the largest banks) as fixed income investments. Different banks offer different interest rates on CDs, so it is important to first shop around and compare maturity periods of CDs, especially their annual percentage yields (APY). This ultimately determines how much interest is received. The process of buying CDs is straightforward; an initial deposit will be required, along with the desired term. CDs tend to have various minimum deposit requirements. Brokers can also charge fees for CDs purchased through them.

"Buying" a CD is effectively lending money to the seller of the CD. Financial institutions use the funds from sold CDs to re-lend (and profit from the difference), hold in their reserves, spend for their operations, or take care of other miscellaneous expenses. Along with the federal funds rate, all of these factors play a part in determining the interest rates that each financial institution will pay on their CDs.

History of CDs

Although they weren't called CDs then, a financial concept similar to that of a modern CD was first used by European banks in the 1600s. These banks gave a receipt to account holders for the funds they deposited, which they lent to merchants. However, to ensure that account holders did not withdraw their funds while they were lent out, the banks began to pay interest for the use of their money for a designated period of time. This sort of financial transaction is essentially how a modern CD operates.

A major turning point for CDs happened in the early twentieth century after the stock market crash of 1929, which was partly due to unregulated banks that didn't have reserve requirements. In response, the FDIC was established to regulate banks and give investors (such as CD holders) assurance that the government would protect their assets up to a limit.

Historically, rates of CD yields have varied greatly. During the high-inflation years of the late 1970s and 1980s, CDs had return rates of almost 20%. On the other hand, CD rates have dropped to as low as standard savings rates during certain years. CD rates have declined since 1984, a time when they once exceeded 10% APY. In late 2007, just before the economy spiraled downward, they were at 4%. In comparison, the average one-year CD yield is around 0.4% in 2017. In the US, the Federal Reserve, which controls federal funds rate, calibrates them accordingly based on the economic climate.

How to Use CDs

CDs are effective financial instruments when it comes to protecting savings, building short term wealth, and ensuring returns without risk. With these key benefits in mind, it is possible to capitalize on CDs by using them to:

As the maturity date for a CD approaches, CD owners have options of what to do next. In most cases, if nothing is done, after maturity date the funds will likely be reinvested into another similar CD. If not, it is possible for buyers to notify the sellers to transfer the funds into a checking or savings account, or reinvest into a different CD.

Withdrawing from a CD

Funds that are invested in CDs are meant to be tied up for the life of the certificate, and any early withdrawals are normally subject to a penalty (except liquid CDs). The severity of the penalty depends on the length of the CD and the issuing institution. As an aside, in certain rising interest rate environments, it can be financially beneficial to pay the early withdrawal penalty in order to reinvest the proceeds into new higher yielding CDs.

CD Ladder

While longer-term CDs offer higher returns, an obvious drawback to them is that the funds are locked up for longer. A CD ladder is a common strategy employed by investors that attempts to circumvent this drawback by using multiple CDs. Instead of renewing just one CD with a specific amount, the CD is split up into multiple amounts for multiple CDs in a set up that allows them to mature at staggered intervals. For example, instead of investing all funds into a 3-year CD, the funds are used to invest in 3 different CDs at the same time with terms of 1, 2, and 3 years. As one matures, making principal and earnings available, proceeds can be optionally reinvested into a new CD or withdrawal. CD laddering can be beneficial when more flexibility is required, by giving a person access to previously-invested funds at more frequent intervals, or the ability to purchase new CDs at higher rates if interest rates go up.


It is important to make the distinction between annual percentage yield (APY) and annual percentage rate (APR). Banks tend to use APR for debt-related accounts such as mortgages, credit cards, and car loans, whereas APY is often related to interest-accruing accounts such as CDs and money market investments. APY denotes the amount of interest earned with compound interest accounted for in an entire year, while APR is the annualized representation of monthly interest rate. APY is typically the more accurate representation of effective net gains or losses, and CDs are often advertised in APY rates.

Compounding Frequency

The calculator contains options for different compounding frequencies. As a rule of thumb, the more frequently compounding occurs, the greater the return. To understand the differences between compounding frequencies or to do calculations involving them, please use our Compound Interest Calculator.

Types of CDs

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