12 Month CD Rates Calculator

What a 12 month CD pays at the rates you are quoted

A 12 month CD locks a deposit for one year and returns it with interest on the same calendar date in the following year. Once the bank quotes an APY, the maturity value is one multiplication: maturity = deposit x (1 + APY). Put $10,000 into a CD quoted at 4.50% APY and the arithmetic is 10,000 x 1.045 = $10,450.00, so the interest is $450.00.

The spread between the top and bottom row is the whole reason to shop. A 4.50% quote against the 1.76% national average is 274 basis points, which is $274.00 on $10,000 and $685.00 on $25,000 for the identical commitment of a year. Nothing about the product changes across those rows except the number the bank chose to print.

Quotes on the same day in late October 2026 ran from 3.50% at a large branch bank to 4.50% on an 11 month special, with 4.25% widely available at $500 minimums. The panel above takes four quotes side by side so the dollar gap is visible before you open a second browser tab.

Why 25 basis points is $25, not $250

A basis point is one hundredth of a percentage point, so 25 basis points is 0.25%. In dollars the move is deposit x 0.0025. On $10,000 that is $25.00 for a year. On $50,000 it is $125.00. On $250,000 it is $625.00. Rate tables quote percentages because that is how the market talks; only the dollar figure pays a bill.

The mistake that shows up most often is a decimal slip: treating 0.25% as 25% and expecting $2,500 on $10,000. The second most common is comparing a 4.50% APY to a 4.40% nominal rate compounded monthly, which resolves to 4.49% APY, so the "10 point" edge shrinks to a single point.

Over a single year the differences look small. Renew the same CD five times at a 25 basis point edge and the same deposit collects $125.00 extra before any compounding on the interest, which is roughly the cost of a modest utility bill. The edge compounds only if you keep rolling it.

The FDIC national average is not the rate you will be offered

The FDIC publishes a national deposit rate every third Monday, weighted by each institution's share of domestic deposits. Because the branch networks hold most of the country's deposits and pay close to nothing, the weighted average sits far below the competitive end of the market. On October 19, 2026 the 12 month national rate was 1.76%, while a 12 month quote of 4.25% to 4.50% was ordinary at online banks and credit unions.

Two readings matter here. First, the average is a benchmark, not an offer: it tells you whether a quote is near the middle of the market or near the top. Second, the Treasury column shows what the same money earns with no bank credit risk at all, which is the number a CD has to beat after tax.

The rate cap column is a supervisory ceiling, not a shopping target. It is the higher of the national rate plus 75 basis points or 120% of the matching Treasury yield plus 75 basis points, and it exists to limit how far a thinly capitalized institution can reach for deposits. A quote far above the cap is a prompt to read the disclosure twice, not a bargain.

The FDIC national rates table is published monthly and is the cleanest single page to check before accepting a renewal rate.

What is inside the quoted APY

An APY is the growth over one year including compounding, defined as APY = (1 + r/n)^n - 1 for a nominal rate r compounded n times. That definition is why APY is the only fair comparison across banks: a 4.50% APY pays $450.00 on $10,000 whether the bank credits interest monthly, quarterly or once at maturity.

Flip the formula and a nominal rate turns into an APY. A 4.40% nominal rate compounded monthly becomes (1 + 0.044/12)^12 - 1 = 4.4898%, which rounds to 4.49% APY. A 4.50% nominal rate compounded quarterly becomes 4.5765% APY. Both look like "about four and a half" in an advertisement and both behave differently at maturity.

The reverse conversion is useful when you want to know what lands in the account each month. A 4.50% APY is 0.3675% a month, so $10,000 credits about $36.75 in the first month and slightly more each month after that. A 4.25% APY credits $34.74. Those two monthly figures, multiplied out and compounded, are exactly the maturity values in the first table.

Federal Truth in Savings rules require the APY in the account disclosure, which makes it the number to write down. If a listing shows only a rate, ask for the APY in writing before you compare it to anything else.

Minimums, jumbo tiers, and the $250,000 insurance line

Minimum deposits for a 12 month CD in late 2026 ranged from $0 at one online bank to $5,000 at a branch institution, and the minimum rarely tracks the rate. A $500 minimum can carry the best quote on the board while a $100,000 jumbo tier at the same bank pays less than the standard certificate.

Jumbo pricing is worth checking rather than assuming. Take a bank posting 3.50% on its standard 12 month CD and 4.00% on the jumbo version at $100,000. The jumbo pays $4,000.00 of interest for the year against $3,500.00 on the standard tier, a $500.00 difference, but the same $100,000 split into two standard CDs at 4.50% elsewhere would earn $4,500.00. The tier label is not a substitute for the APY.

Insurance is the constraint on large balances. FDIC coverage is $250,000 per depositor, per insured bank, per ownership category, so a single $600,000 CD at one bank leaves $350,000 exposed. Split it into three banks at $200,000 each, or hold it as a payable-on-death account naming beneficiaries, which opens a separate ownership category and multiplies the limit. The FDIC deposit insurance page sets out the categories, and the CFPB certificate of deposit explainer covers the disclosure a bank owes you before you sign.

Credit unions price the same product as a share certificate under NCUA insurance, with the same $250,000 limit. A rate comparison that skips credit unions is missing a large part of the competitive market.

A 12 month CD next to a 1 year Treasury bill

The 12 month Treasury yield was 4.54% on October 19, 2026 against a 1.76% national CD rate and a competitive CD quote near 4.50%. On $10,000 the bill pays $454.00 and the CD pays $450.00, which looks like a wash until tax enters the picture.

Treasury interest is exempt from state and local income tax; CD interest is not. For someone in the 22% federal bracket and a 5% state bracket, the $450.00 of CD interest nets $328.50 after $121.50 of tax, while the $454.00 of Treasury interest nets $354.12 after federal tax alone. The bill wins by $25.62 on a $10,000 deposit, and the gap widens with the state rate and the deposit size.

Liquidity cuts the other way. A Treasury bill can be sold in the secondary market before maturity at the day's price, which may be above or below what you paid. A CD cannot be sold; the only exit is the bank's early withdrawal penalty, usually three months of interest on a 12 month term, which on $10,000 at 4.50% is $112.50.

Both are backed by the full faith of the United States in the case of the bill and by federal deposit insurance up to $250,000 in the case of the CD. TreasuryDirect sells bills in $100 increments with no commission, which makes the comparison easy to run at your own deposit size.

The maturity date, the grace period, and the renewal rate

A 12 month CD opened on November 2, 2026 matures on November 2, 2027, a Tuesday, for 365 days of interest. The bank must give you a window at maturity, typically seven to ten days, during which you can move the money or change the terms without penalty. Miss the window and the CD renews automatically at whatever rate the bank is paying that day.

That default is where the money leaks. A $10,000 CD that renews at the 1.76% national average instead of a 4.50% quote earns $176.00 instead of $450.00, a $274.00 loss for one missed email. Banks are not required to remind you at the rate you would prefer, and the renewal disclosure often arrives as a statement insert.

Two habits close the gap. Put the maturity date in a calendar with a reminder three days early, and ask at opening whether the renewal is automatic and at what rate it defaults. If the answer is "the then current rate," treat the maturity date as a decision point rather than a deposit that takes care of itself.

Term length deserves the same scrutiny as rate. An 11 month special at 4.50% can beat a 12 month standard certificate at 4.25%, and the difference in the calendar is four weeks. Compare APY and maturity date together, not the number of months printed in the product name.

A five minute checklist before the money moves

Run these six checks against the disclosure, not the marketing page. Each one has cost real money for someone.

• APY, not rate. Write down the APY and confirm it matches the quote. A 4.40% nominal rate compounded monthly is 4.49% APY, not 4.40%.
• Penalty in months, not dollars. Three months of interest on $10,000 at 4.50% is $112.50; six months is $225.00. Ask which balance the penalty is computed on.
• Minimum and maximum. Confirm the quote applies at your deposit size, and whether a jumbo tier pays more or less than the standard one.
• Maturity date and grace days. Note both, and whether renewal is automatic.
• Insurance headroom. Total all balances at the same bank under the same ownership category against the $250,000 limit.
• Interest payment method. Credited to the CD and compounded, or paid out to a checking account. The first compounds; the second does not.

One more item is worth a sentence: the CD is a contract, and the bank's right to call it, bump it or cap it belongs in the same disclosure. A callable 12 month CD can be redeemed by the bank before maturity, which caps your upside while the headline APY advertises the upside. If the word callable appears, price the CD as a shorter term with an uncertain end date.