CD Calculator

See exactly what a fixed-rate certificate of deposit will be worth when it matures.

How the CD Calculator works

The CD Calculator projects the maturity value and total interest of a Certificate of Deposit by applying the standard compound interest formula A = P(1 + r/n)^nt, where A is the ending balance, P is your initial deposit (principal), r is the stated annual interest rate as a decimal, n is the number of compounding periods per year, and t is the term in years. The tool isolates interest as Interest = A − P so you can see exactly what the bank pays you for locking up your cash.

Internally, this cd interest calculator handles four common compounding cadences used by US banks and credit unions: daily (n = 365), monthly (n = 12), quarterly (n = 4), and annual (n = 1). When the input is APY (annual percentage yield) rather than the nominal rate, the calculator converts it back to the periodic rate using r = n × ((1 + APY)^1/n − 1) so the math reflects what you actually earn, not just the headline number on the rate sheet.

The step-by-step flow is:

1. Read principal (P), APY or nominal rate (r), term in months, and compounding frequency.
2. Convert the term to years (t = months / 12) and rate to a decimal (5.25% becomes 0.0525).
3. Raise (1 + r/n) to the power of n × t to find the growth factor.
4. Multiply by P to get the maturity value A.
5. Subtract P from A to display total interest earned.
6. Optionally apply an early-withdrawal penalty, usually expressed as X months of simple interest, computed as Penalty = P × r × (penalty_months / 12).

Edge cases the cd return calculator accounts for: terms shorter than one compounding cycle (uses fractional exponents), promotional “blended APY” CDs where the rate steps up after a set date, and add-on CDs that allow additional deposits during the term. For jumbo cd calculator scenarios (typically $100,000 or more), the math is identical, but rounding becomes meaningful: a 0.05% APY difference on a $250,000 jumbo deposit over five years equals about $625, which is why the calculator displays interest to the cent.

Results assume the rate is fixed and that interest is left to compound, not withdrawn monthly as a check. If you elect monthly interest disbursement, your effective return drops because you forfeit compounding on the paid-out interest. The calculator can toggle this behavior to show both outcomes side by side.

Example calculation

Below are three worked scenarios that demonstrate how the cd calculator apy logic plays out across different deposit sizes, terms, and compounding frequencies. Each uses real rate tiers commonly seen on US bank rate sheets in 2025-2026.

Scenario 1: $5,000, 12-month CD at 4.75% APY, compounded daily

With P = $5,000, r = 0.04750, n = 365, t = 1, the maturity value is 5000 × (1 + 0.04750/365)³⁶⁵ = $5,243.41. Interest earned: $243.41. Because compounding is daily, the effective return matches the posted APY almost exactly.

Scenario 2: $25,000 jumbo CD, 36 months at 4.40% APY, compounded monthly

P = $25,000, r = 0.044, n = 12, t = 3. A = 25000 × (1 + 0.044/12)³⁶ = $28,524.06. Interest earned: $3,524.06. If you withdrew early after 18 months and the penalty was 6 months of simple interest, the penalty would be 25000 × 0.044 × 0.5 = $550, leaving you with approximately $26,659 instead of the projected midpoint balance.

Scenario 3: $10,000 high yield CD compared across compounding frequencies (5.00% APY, 5-year term)

Compounding	Periods (n)	Maturity value	Interest earned
Annual	1	$12,762.82	$2,762.82
Quarterly	4	$12,820.37	$2,820.37
Monthly	12	$12,833.59	$2,833.59
Daily	365	$12,840.03	$2,840.03

The table shows the gap between annual and daily compounding on the same nominal 5% rate is only about $77 over five years on a $10,000 deposit. This is why APY, not compounding frequency, is the more important comparison metric: APY already standardizes for compounding. A 5.00% APY daily-compounded CD and a 5.00% APY annually-compounded CD return identical dollars; only the nominal rate differs.

For a cd ladder calculator example: splitting $20,000 into four $5,000 rungs at 1, 2, 3, and 4 year terms (at 4.5%, 4.6%, 4.7%, and 4.8% APY respectively) yields roughly $3,920 in combined interest while giving you access to $5,000 every 12 months for reinvestment or spending, versus locking everything for four years at 4.8% and earning about $4,228 but losing liquidity.

Tips for using the CD Calculator

• Always input APY, not the nominal rate, when the calculator offers both. APY already bakes in compounding frequency, so two CDs at 4.85% APY return identical dollars regardless of whether one compounds daily and the other monthly.
• Match the CD term to a real funding date on your calendar. If you need the cash for a 28-month home purchase, a 24-month CD with a 4-month reinvestment in a savings account beats a 36-month CD where you eat an early-withdrawal penalty.
• Run the early withdrawal penalty calculator before committing. A 5-year CD with a 12-month interest penalty is functionally a 4-year CD if rates fall, since you can break it and still keep most of the gain.
• For jumbo CDs above the FDIC $250,000 per-depositor limit, split the deposit across two banks or two ownership categories. The cd value calculator math is identical, but uninsured dollars carry real bank-failure risk.
• Compare brokered CDs separately. They trade on a secondary market like bonds, so the cd yield calculator must account for potential capital loss if you sell before maturity when rates have risen.
• Use a cd ladder calculator with rungs at 6, 12, 18, and 24 months instead of the classic 1-2-3-4-5 year ladder when you expect rates to stay volatile. Shorter rungs reinvest faster and capture rate increases sooner.
• Account for taxes on the interest. CD interest is taxed as ordinary income at the federal level the year it is credited, even if the CD has not matured. A 5% APY drops to about 3.6% net at a 28% marginal bracket.
• Watch for callable CDs in the fine print. If the issuer can call the CD after 12 months, your high yield cd calculator projection out to year 5 is worthless if rates drop and they redeem early.
• Recheck the rate sheet within seven days of funding. Many banks honor the posted rate only at deposit, not at application, and a 0.25% APY swing on a $50,000 5-year CD is roughly $625 in lost interest.

A short history of the certificate of deposit

The CD as Americans know it was created by First National City Bank of New York (now Citibank) in 1961 when it introduced the negotiable certificate of deposit to attract corporate cash that had been migrating to Treasury bills. Before 1961, banks were capped on the interest they could pay on time deposits by Federal Reserve Regulation Q, so they invented a transferable instrument with a guaranteed term to compete.

Regulation Q caps on consumer CDs were not fully phased out until 1986. That deregulation triggered the rate wars of the late 1980s and early 1990s, when consumer CDs routinely paid 8% to 10% APY. Since the 2008 financial crisis, CD rates collapsed below 1% for nearly a decade, then surged back above 5% APY in 2023-2024 as the Federal Reserve raised the federal funds rate to fight inflation. Understanding this cycle is why a cd rate calculator matters: rates are not static, and locking in a 5-year term at a peak can outperform stocks during the next downturn.

Regional and account-type variations to know

In the United States, CDs are federally insured by the FDIC up to $250,000 per depositor, per insured bank, per ownership category. Credit unions offer the equivalent product called a share certificate, insured by the NCUA on identical terms. The cd account calculator math is the same, but the labels differ.

In the United Kingdom, the closest equivalent is a fixed-rate bond or fixed-rate savings account, protected by the FSCS up to £85,000. In Canada, the product is called a Guaranteed Investment Certificate (GIC), insured by CDIC up to CAD $100,000 per category. Both follow the same compound interest formula, but UK fixed bonds often pay interest annually on the anniversary rather than compounding throughout the term, which materially changes the cd interest rates calculator output. Always confirm whether interest is compounded or paid as simple interest on the anniversary before relying on a projection.

Common misconceptions about CD returns

The most common misconception is that a CD compounded daily always beats one compounded monthly. False. If both are quoted at the same APY, they return identical dollars; only the nominal rate differs. APY is the apples-to-apples number.

The second misconception is that CDs are risk-free. They carry no credit risk up to the FDIC limit, but they carry significant reinvestment risk (rates may be lower when the CD matures) and inflation risk (a 4.5% CD loses purchasing power if inflation runs at 5%). Real return is APY minus inflation, not the headline APY.

Third, many savers believe early-withdrawal penalties can wipe out the principal. They cannot at federally insured banks; by regulation the penalty is capped at accrued interest plus, in rare cases, a small principal reduction disclosed in the deposit agreement. The cd early withdrawal penalty calculator should always show the worst case before you commit.

Advanced use cases: laddering, barbelling, and bullets

A CD ladder divides one lump sum across multiple maturities (commonly 1, 2, 3, 4, and 5 years) so one rung matures each year and is reinvested at the longest term. This averages your rate over time and produces a predictable annual liquidity event.

A barbell strategy splits the money between very short CDs (3-6 months) and very long CDs (5 years), skipping the middle. It works when the yield curve is flat or inverted and short-term rates are unusually high.

A bullet strategy stacks multiple CDs that all mature on the same future date, useful for funding a known expense like a college tuition payment or a home down payment. Use the savings goal calculator together with the cd maturity calculator to size the rungs so the combined maturity hits your target dollar amount on the right date.

For high-net-worth savers, CDARS (Certificate of Deposit Account Registry Service) spreads a single multi-million dollar deposit across a network of banks in $250,000 chunks so the entire balance stays FDIC insured. The jumbo cd calculator math is unchanged; only the custody arrangement differs.

Mistakes that quietly cost CD savers thousands

The biggest, most common mistake is automatic rollover. Most banks renew a matured CD into a new CD of the same term at whatever the current rate is, often well below the best available rate. Set a calendar reminder 14 days before maturity to shop the market.

Second is choosing a CD over a high-yield savings account when rates are inverted. In 2024-2025 many online savings accounts paid more than 1-year CDs with full liquidity. The cd return rate calculator only makes sense versus the genuine alternative, not against a checking account paying 0.01%.

Third is ignoring the tax drag. CD interest is taxed annually as ordinary income, even on multi-year CDs where you have not received the cash. A 5% APY CD held in a taxable account at a 32% marginal rate has a true after-tax yield of about 3.4%. Holding the CD in an IRA eliminates this drag; see the Roth IRA calculator for comparison.

Fourth is failing to reinvest the interest when interest is paid as a monthly check rather than compounded. This is essentially a self-imposed simple interest CD and forfeits the geometric growth the cd compound interest calculator projects.

CDs versus the main alternatives

Direct answer: a CD beats a high-yield savings account when its APY premium over the savings rate exceeds the value of liquidity for your time horizon, and it beats a Treasury bill when its after-state-tax yield is higher than the T-bill yield (T-bill interest is exempt from state income tax).

Vehicle	Typical APY (2026)	Liquidity	FDIC/Treasury backed	State tax
High-yield savings	4.00% - 4.75%	Same day	FDIC	Taxed
1-year CD	4.50% - 5.10%	Locked, penalty applies	FDIC	Taxed
1-year Treasury bill	4.40% - 4.90%	Sell on secondary market	US Treasury	Exempt
I bond (12 mo+)	Variable, inflation-linked	Lock for 12 mo	US Treasury	Exempt
Money market fund	4.20% - 5.00%	Same day	Not insured (SIPC custody)	Taxed

For comparison projections beyond cash equivalents, model stock-style returns with the investment calculator and inflation-adjusted growth with the inflation calculator to see how a CD-only allocation performs over multi-decade horizons.

The math behind APY, APR, and compounding frequency

APY (annual percentage yield) is the true return after compounding: APY = (1 + r/n)ⁿ − 1. APR (annual percentage rate) is the simple nominal rate. For a CD paying 4.89% nominal compounded daily, APY = (1 + 0.0489/365)³⁶⁵ − 1 = 5.01%.

The relationship works in both directions. If a bank advertises 5.00% APY and compounds monthly, the nominal rate is r = 12 × ((1.05)^1/12 − 1) = 4.8889%. This is why every cd interest rate calculator should accept APY input directly: it eliminates rounding errors and matches the disclosure on the rate sheet.

For a deeper walkthrough of compound interest beyond CDs, see what is compound interest and the standalone compound interest calculator. For doubling-time estimates without a calculator, use the Rule of 72 calculator: a 5% APY CD doubles your money in approximately 72 ÷ 5 = 14.4 years.

What a $10,000 CD earns by term

The table below shows the maturity value and interest for a $10,000 certificate of deposit at a 4.50% APY, compounded daily (n = 365). Each figure is computed with the standard formula A = P(1 + r/n)^nt, so you can see how locking in for longer multiplies your interest. Your bank's posted APY may differ, so treat these as a worked example.

Term	Maturity value	Interest earned
6 months	$10,227.54	$227.54
1 year	$10,460.25	$460.25
2 years	$10,941.68	$941.68
3 years	$11,445.27	$1,445.27
5 years	$12,523.05	$2,523.05

To run these numbers for your own deposit, term, or your bank's exact APY, enter them into the CD Calculator above and it will recompute the maturity value and interest to the cent.

Related on this site

compound interest calculator · high-yield savings calculator · APY calculator · long-term investment calculator · savings goal calculator · Rule of 72 calculator · inflation impact calculator · Roth IRA calculator · what is compound interest · how to calculate CD interest

For a related deep dive, see FDIC deposit insurance coverage rules.

CD Calculator — frequently asked questions

Early withdrawal?

Cashing out a CD early usually triggers a penalty of several months of interest.

FDIC insured?

Bank CDs are typically insured up to the federal limit per depositor.

What is a CD ladder?

Splitting money across CDs of staggered terms so one matures regularly.

How do I calculate CD interest by hand?

Use the formula A = P(1 + r/n)^nt, then subtract the principal P to isolate interest. Convert the rate to a decimal (5% becomes 0.05), pick n based on compounding (12 for monthly, 365 for daily), and use t in years. Example: $8,000 at 4.75% APY compounded monthly for 24 months = 8000 × (1 + 0.0475/12)²⁴ = $8,793.86, so interest earned is $793.86. The cd calculator above automates this exact calculation.

How is CD interest calculated when compounded daily?

When compounded daily, the bank computes interest each calendar day using r/365 of the nominal rate on the current balance, then adds it to the balance for the next day. Over a full year this produces an APY slightly higher than the nominal rate: a 4.90% nominal rate becomes about 5.02% APY. Most US online banks compound daily and credit the accrued interest monthly. The cd calculator compounded daily setting reproduces this method to the cent.

What is APY on a CD?

APY (annual percentage yield) is the total percentage return you earn on a CD over one year after all compounding is included. It is the apples-to-apples number for comparing CDs because two products with identical APYs return identical dollars regardless of compounding frequency. By federal Truth in Savings law, US banks must disclose APY on every CD offer, which is why the cd calculator apy field is the most reliable input.

How do I calculate the early withdrawal penalty on a CD?

Most US banks charge a penalty equal to a fixed number of months of simple interest on the withdrawn amount. The formula is Penalty = P × r × (penalty_months / 12). Example: breaking a $15,000 CD at 4.6% with a 6-month penalty costs 15000 × 0.046 × 0.5 = $345. If you have not yet earned that much interest, some banks dip into principal to collect the full penalty, so the cd early withdrawal penalty calculator should always show the worst case.

How is a CD ladder calculated?

A CD ladder is calculated by dividing a lump sum into equal rungs and projecting each at its own term and rate. For a $20,000 ladder split into four $5,000 rungs at 1, 2, 3, and 4 year terms, you run the compound interest formula on each rung separately, then sum the maturity values. The cd ladder calculator above does this for you and shows the blended weighted-average APY plus the cash flow available each anniversary.

How do I calculate CD maturity value?

CD maturity value equals the principal grown by compound interest over the full term: A = P(1 + r/n)^nt. For a $12,500 deposit at 4.30% APY compounded monthly for 30 months, A = 12500 × (1 + 0.043/12)³⁰ = $13,915.45. The cd maturity calculator handles the exponent and rounding so you do not need a financial calculator. Always confirm whether the rate input is APY or nominal before computing.

What is the difference between a CD and a savings account?

A CD locks your money for a fixed term in exchange for a guaranteed rate, while a savings account allows withdrawals anytime but the rate can change daily. CDs typically pay 0.25% to 1.00% more APY than savings for terms over six months, but breaking a CD early triggers a penalty. Use the cd calculator to project earnings then compare against the <a href="/savings-calculator/">savings calculator</a> at current rates to see the dollar difference.

Are CDs worth it in 2026?

CDs are worth it in 2026 when the locked-in APY exceeds your inflation expectation by at least 1% and you have no need for the cash during the term. With 1-year CDs paying 4.50% to 5.10% APY and core inflation near 2.5%, real returns of 2% to 2.5% are positive. CDs are not the best choice for money you might need on short notice or for long-horizon growth goals where the <a href="/investment-calculator/">investment calculator</a> shows stocks historically outperforming.

How much will a $50,000 CD earn?

A $50,000 CD at 5.00% APY compounded daily earns $2,562 in one year, $5,253 over two years, and $13,814 over five years. Math: A = 50000 &times; (1 + 0.05/365)^{365 &times; 5} = $63,814.08. The cd interest calculator lets you swap the rate to match your bank's actual offer; even a 0.25% APY difference adds roughly $640 to a $50,000 deposit over five years.

Do CDs pay interest monthly?

Most CDs compound interest internally each day or month, but only credit (post) the accrued interest to your balance once per month. By default the interest stays in the CD and continues to compound to maturity. Some banks let you elect a monthly check or transfer to a checking account; this disbursement option converts the CD into a simple-interest product and reduces your effective return, which the cd interest calculator monthly setting can show.

What is a jumbo CD?

A jumbo CD is a certificate of deposit with a minimum balance of typically $100,000, sometimes $50,000 at credit unions. Jumbo CDs historically paid a small premium over standard CDs, often 0.05% to 0.20% APY, but the spread has narrowed since 2020 as online banks raised standard CD rates. The jumbo cd calculator math is identical to a standard CD, but FDIC insurance becomes a real consideration because $250,000 is the per-depositor cap at each bank.

How do high yield CDs differ from regular CDs?

High yield CDs are simply CDs whose APY ranks in the top 10 to 20 nationally, usually offered by online banks and credit unions with low overhead rather than national branch banks. There is no separate product category; the math, FDIC coverage, and tax treatment are identical. Use the high yield cd calculator to compare a 5.10% APY online CD against a 1.50% APY branch CD: on $10,000 over three years that gap is $1,143 in extra interest.

Is CD interest taxable?

Yes, CD interest is taxable as ordinary income at the federal level in the year it is credited to your account, even if the CD has not yet matured. The bank issues a Form 1099-INT each January reporting the prior year's interest. State tax also applies in most states. Holding the CD inside an IRA or 401(k) defers this tax; the after-tax yield in a taxable account is APY &times; (1 &minus; marginal_tax_rate).

How do I calculate CD interest compounded monthly?

For monthly compounding, set n = 12 in the formula A = P(1 + r/n)^nt. A $7,500 deposit at 4.40% APY for 18 months: A = 7500 &times; (1 + 0.044/12)¹⁸ = $8,011.30, so interest is $511.30. If the bank quotes APY rather than nominal rate, the cd calculator compounded monthly setting automatically backs out the nominal rate first so the result matches your bank statement to the cent.

What happens if I withdraw a CD early?

If you withdraw before maturity, the bank applies an early-withdrawal penalty defined in your deposit agreement, typically 3 to 12 months of interest depending on the term length. Federal regulations require a minimum 7-day penalty on terms under 90 days. The penalty is deducted from interest first and from principal only if interest is insufficient. Run the cd early withdrawal penalty calculator before signing to see if the worst-case break cost is acceptable.

How do I calculate a 6-month CD at 4.5% APY?

A 6-month CD uses A = P(1 + r/n)^nt with t = 0.5 years. For $5,000 at 4.50% APY compounded daily (n = 365): A = 5000 × (1 + 0.045/365)^(365 × 0.5) = $5,113.77, so interest is $113.77. On $10,000 the same term pays $227.54. Enter your deposit, 4.5 as the APY, and a 6-month term in the calculator above to confirm.

How much does a $1,000 CD earn in a year at 5%?

A $1,000 CD at 5.00% APY earns about $51 in one year. With daily compounding (n = 365): A = 1000 × (1 + 0.05/365)^365 = $1,051.27, so interest is $51.27. Because the rate is quoted as APY, the result is roughly the same whether the bank compounds daily or monthly. Swap in your own deposit to scale the figure.

How do I calculate a 3-month (90-day) CD?

A 90-day CD is calculated as A = P(1 + r/n)^nt with t = 0.25 years (90 ÷ 365 ≈ 0.2466 is also used). For $10,000 at 5.00% APY compounded daily: A = 10000 × (1 + 0.05/365)^(365 × 0.25) = $10,125.78, so interest is $125.78. Short terms earn little, so always compare against a no-penalty CD or high-yield savings before locking up cash.

What will a $100,000 jumbo CD earn at 5.25% APY?

A $100,000 jumbo CD at 5.25% APY earns about $5,390 in one year. Math: A = 100000 × (1 + 0.0525/365)^365 = $105,389.86 with daily compounding. The formula is identical to a standard CD, but $100,000 sits within the $250,000 FDIC per-depositor limit at one bank. Enter your jumbo deposit and posted APY above to project any term.

How do I calculate a 5-year (60-month) CD?

A 60-month CD uses t = 5 years in A = P(1 + r/n)^nt. For $25,000 at 4.00% APY compounded daily: A = 25000 × (1 + 0.04/365)^(365 × 5) = $30,534.73, so interest is $5,534.73. A $10,000 deposit at 4.50% APY over the same five years grows to $12,523.05. Set the term to 5 years in the calculator to test your own rate.

How do I calculate CD interest compounded quarterly?

For quarterly compounding, set n = 4 in A = P(1 + r/n)^nt. A $20,000 deposit at 4.50% nominal for 3 years: A = 20000 × (1 + 0.045/4)^(4 × 3) = $22,873.49, so interest is $2,873.49. Quarterly compounding produces slightly less than daily at the same nominal rate, but if the bank quotes APY the dollar result is the same regardless of frequency.

How do I calculate CD interest compounded annually?

Annual compounding sets n = 1, so the formula simplifies to A = P(1 + r)^t. A $10,000 CD at 5.00% for 5 years: A = 10000 × (1.05)^5 = $12,762.82, giving $2,762.82 in interest. This is the highest nominal-rate scenario for a given APY because less frequent compounding requires a higher posted rate to reach the same yield. Choose Annually in the compounding dropdown above.

Does this work for a Navy Federal CD?

Yes. CD math is standardized, so this calculator works for any Navy Federal certificate (or any bank or credit union). Just enter the deposit, the term, and Navy Federal's posted APY for that certificate, and choose the matching compounding frequency. Note credit unions often call the rate a 'dividend rate' and the yield an APY; use the APY for the most accurate projection. We never display any institution's live rates.

Can I use this for an Ally or Marcus high-yield CD?

Yes. The compound interest formula is the same at every online bank, so this calculator works for Ally, Marcus, Discover, Synchrony, Capital One, and similar high-yield issuers. Look up the current APY on that bank's rate sheet, enter it with your deposit and term, and the tool returns maturity value and interest. We do not pull any bank's live rates, so always confirm today's posted APY.

How do I calculate CD interest in Excel?

In Excel, use the FV function: =FV(rate/n, n*t, 0, -P). For a $5,000 CD at 4.50% APY compounded monthly for 2 years, enter =FV(0.045/12, 12*2, 0, -5000), which returns $5,469.95 — about $469.95 in interest. Use a negative principal so the result is positive. You can also type the raw formula =5000*(1+0.045/12)^(12*2). The calculator above does this automatically.

How do I calculate CAGR in Google Sheets?

In Google Sheets, CAGR = (Ending ÷ Beginning)^(1 ÷ years) − 1. Enter =(B2/A2)^(1/C2)-1 where B2 is ending value, A2 is starting value, and C2 is years, then format as a percentage. For a CD that grew $10,000 to $12,000 over 3 years: (12000/10000)^(1/3) − 1 = 6.27%. CAGR is the smoothed annual growth rate, useful for comparing a CD's return to other investments.

What is the difference between a CD and a money market account?

A CD locks your money at a fixed APY for a set term, while a money market account (MMA) keeps it liquid with a variable rate and often check-writing or a debit card. CDs usually pay a higher fixed rate for terms over six months, but MMAs let you withdraw anytime. Both are FDIC insured to $250,000. Choose a CD when you won't need the cash and want rate certainty.

Should I choose a CD or a Treasury bill?

Choose a CD when its after-state-tax APY beats the T-bill yield; choose a T-bill when you value state-tax exemption or secondary-market liquidity. Treasury bill interest is exempt from state and local income tax but taxable federally, which can make a 4.7% T-bill beat a 5.0% CD in a high-tax state. CDs are FDIC insured; T-bills are backed by the US Treasury. Compare after-tax yields, not headline rates.

What is a no-penalty CD and is the math different?

A no-penalty CD lets you withdraw your full balance plus accrued interest before maturity without a penalty, usually after a brief initial lock of about seven days. The maturity math is identical: A = P(1 + r/n)^nt. The only difference is flexibility — no-penalty CDs typically pay a slightly lower APY than standard CDs in exchange. Enter the posted no-penalty APY above to project the worst case if you never withdraw early.

What is a bump-up (step-up) CD?

A bump-up CD lets you raise your rate once (or on a schedule) if the bank's offered APY rises during your term; a step-up CD increases on preset dates automatically. Because the rate changes mid-term, model each rate period separately with A = P(1 + r/n)^nt and chain the balances. These CDs start with a lower APY than a fixed CD, so the bump only pays off if rates climb enough to overtake it.

How much monthly interest does a CD pay if I take payouts?

If you elect monthly interest payouts, the bank pays roughly P × APY ÷ 12 each month as simple interest instead of compounding it. A $10,000 CD at 4.00% APY pays about $33.33 a month ($10,000 × 0.04 ÷ 12). Taking the interest out lowers your total return versus leaving it to compound, because you forfeit growth on the paid-out amounts. Use this only if you need the income stream.

Guides & articles

• How to calculate CD interest: APY, the formula, and what banks rarely tell you
• How to Build a CD Ladder: Strategy, Steps, and a $25,000 Example
• How Is a CD Early Withdrawal Penalty Calculated? Formula, Tiers, and Worked Examples

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