CD Calculator

A CD pays a fixed annual percentage yield for a fixed term. APY already includes the effect of compounding, which is why it is the only number worth comparing across banks. A CD advertising a 4.40% interest rate compounded daily and one advertising a 4.50% APY are close cousins, but only the APY tells you what you will actually earn.

The maturity value is the deposit multiplied by (1 + periodic rate) raised to the number of compounding periods. Most banks compound daily or monthly and credit interest monthly or quarterly. The practical difference between daily and monthly compounding at the same nominal rate is small — on a $10,000 one-year CD at 4.5% it is roughly a dollar — so do not let compounding frequency override a genuinely better APY.

Interest can either be added to the CD (the default, and what this calculator assumes) or paid out monthly to a linked account. Compounding inside the CD produces more total interest; paying out monthly produces income you can spend or reinvest elsewhere. Retirees using CDs as an income ladder often choose the payout option deliberately.

CDs are covered by FDIC insurance up to $250,000 per depositor, per insured bank, per ownership category, and by NCUA insurance at credit unions on the same terms. That coverage is the reason CDs sit at the safe end of the yield spectrum: the return is modest, but the principal is guaranteed by the federal government.

Term selection is really a bet on the direction of rates. Short terms of 3 to 12 months keep you flexible and let you reprice quickly if rates rise. Long terms of 3 to 5 years lock in today's yield and protect you if rates fall, which is the more common risk after a rate-cutting cycle begins.

A CD ladder resolves the dilemma without requiring a forecast. Split the money into five equal tranches and buy 1-, 2-, 3-, 4-, and 5-year CDs. Each year one matures; you either spend it or roll it into a new 5-year CD. After four years the entire ladder holds 5-year CDs — historically the highest-yielding rung — while still giving you access to one fifth of the money every twelve months.

A barbell is the simpler alternative: half the money in a short CD or high-yield savings for liquidity, half in a long CD for yield. It is easier to manage and captures most of the benefit for smaller balances.

Watch the automatic renewal clause. Most CDs roll into a new CD of the same term at the bank's then-current standard rate unless you act within a grace period, typically 7 to 10 days after maturity. Standard renewal rates are frequently far below the promotional rates the same bank advertises to new money, so set a calendar reminder for every maturity date.

Pulling money out before maturity triggers an early withdrawal penalty, usually expressed in months of interest: commonly 3 months of interest on terms under a year, 6 months on 1-to-3-year terms, and 6 to 12 months on longer terms. If you withdraw very early, the penalty can exceed the interest earned and eat into principal.

No-penalty CDs let you withdraw the full balance after an initial waiting period, typically seven days, with no charge. They usually yield 0.25 to 0.75 percentage points less than a standard CD of similar term, which is a fair price for optionality if there is any real chance you will need the money.

Bump-up and step-up CDs allow one or more rate increases during the term if the bank raises rates on that product. Brokered CDs are bought through a brokerage, often pay slightly more, and can be sold on a secondary market instead of penalized — but the sale price fluctuates with rates, so you can lose principal. Callable CDs pay a premium yield in exchange for the bank's right to redeem early, which it will do precisely when rates fall and you would rather keep the CD.

Jumbo CDs require $100,000 or more and once carried a meaningful yield premium. In today's market the premium over a standard CD is often just a few basis points, so compare the actual APYs rather than assuming a bigger deposit earns more.

A $10,000 deposit in a 12-month CD at 4.50% APY with monthly compounding matures at about $10,450. Total interest earned: roughly $450, or about $37.50 per month.

Interest on a CD is taxable as ordinary income in the year it is credited, even if you cannot access it until maturity. At a 24% federal marginal bracket the tax owed is about $108, leaving roughly $342 after tax — an effective after-tax yield near 3.42%. Add state income tax and the effective yield falls further in most states.

Stretch the same deposit to a 5-year CD at 4.50% APY and it matures near $12,462, earning roughly $2,462 in interest. Break it after 18 months, though, and a typical 6-month interest penalty of about $225 wipes out nearly a third of the interest earned to that point.

For comparison, a Treasury bill at a similar yield is exempt from state and local income tax, which can make it the better after-tax choice for residents of high-tax states like California, New York, or New Jersey. Run both through your own marginal rates before committing; the headline yields can be identical while the take-home differs by 30 basis points or more.

A high-yield savings account is the CD's closest competitor. It stays fully liquid and has no penalty, but the rate is variable and drops within weeks of a Federal Reserve cut. A CD locks the rate for the full term. In a falling-rate environment, the CD is usually the better instrument; in a rising one, the savings account is.

Treasury bills and notes bought directly through TreasuryDirect or via a brokerage carry the full faith and credit of the US government with no deposit limit, and their interest is exempt from state and local tax. For anyone above $250,000 or living in a high-tax state, Treasuries frequently beat CDs on an after-tax basis.

Money market funds hold short-term government and corporate paper, adjust yields daily, and settle in one business day. They are not FDIC insured, though government money market funds are considered very low risk. They pair well with a CD ladder as the liquid sleeve.

Bond funds are a different animal entirely: the share price fluctuates with interest rates, so a fund can post a negative total return in a year when rates rise sharply. CDs held to maturity cannot. If capital preservation over a fixed horizon is the goal, a CD or an individual Treasury held to maturity is a cleaner instrument than a bond fund.