CD ladder mechanics — build, space, and reinvest for yield

A certificate of deposit pays a fixed interest rate in exchange for the depositor agreeing not to touch the money for a specified term. The trade is clean: the bank gets funding certainty, the depositor gets rate certainty. The problem is that rate certainty and liquidity are in tension. A five-year CD locks in the highest rate on the menu, but the depositor forfeits the ability to access that cash for sixty months without paying a penalty. A high-yield savings account preserves full liquidity, but the rate floats with every Federal Reserve decision and can drop materially in a cutting cycle. The CD ladder is the structural answer to that tension — a way to capture most of the fixed-rate premium of longer-term CDs while maintaining periodic access to a portion of the principal without penalty.

This guide covers the full mechanics of building a CD ladder: how the rungs work, the two primary spacing strategies and when each is appropriate, a worked dollar example with a $25,000 starting balance, the early withdrawal penalty math that determines when breaking a rung is defensible, the comparison with high-yield savings accounts and Treasury bills, the role of no-penalty and brokered CDs as alternatives within the CD universe, the reinvestment decision at each maturity event, the Federal Deposit Insurance Corporation coverage rules that matter when ladder balances are large, and the tax treatment that determines how much of the yield the depositor actually keeps.

What a CD ladder is and why the structure exists

A CD ladder is a portfolio of certificates of deposit with staggered maturity dates, constructed so that one CD matures at regular intervals — typically every twelve months in a standard ladder, though shorter intervals are possible and sometimes preferable. The depositor divides a target cash balance into equal portions and opens one CD at each of the ladder’s term lengths simultaneously. As each CD matures, the depositor either withdraws the principal (if the cash is needed) or reinvests it into a new CD at the longest term of the ladder, maintaining the staggered structure.

The logic is straightforward. In a normal yield curve — the historical default, where longer-term rates exceed shorter-term rates — a five-year CD pays more than a one-year CD. A depositor who wants the five-year rate but also wants some periodic access to capital faces a binary choice without the ladder: lock everything for five years and accept zero liquidity, or stay in shorter terms and accept the lower rate. The ladder eliminates the binary. By spreading the capital across 1-year, 2-year, 3-year, 4-year, and 5-year CDs, the depositor gets annual access to one-fifth of the principal (the rung that matures each year) while holding four-fifths of the capital in longer-term, higher-yielding positions. Once the ladder is fully seasoned — meaning five years have passed and every original rung has matured and been replaced — every rung is a five-year CD, and the depositor is earning the five-year rate across the entire balance while still having one-fifth of it come due every twelve months.

The idea is not new. Community bankers have been recommending CD ladders to depositors since at least the 1980s, and the strategy predates the modern high-yield savings account by decades. What has changed is the competitive landscape: the existence of online HYSAs paying rates within 50 to 100 basis points of the best CD rates, the availability of Treasury bills as a direct competitor with a state-tax advantage, and the proliferation of brokered CDs that allow the ladder to be managed from a single brokerage account rather than across five separate bank relationships.

How to build a basic five-rung ladder — a worked example with $25,000

Consider a depositor with $25,000 in cash that will not be needed for at least five years but might be needed on an uncertain schedule within that window. The depositor decides to build a standard five-rung annual CD ladder. As of mid-2026, representative CD rates from nationally available online banks and credit unions (sourced from Bankrate and DepositAccounts.com, May 2026) are approximately:

Term	Representative APY (May 2026)	Amount per rung
1-year CD	4.50%	$5,000
2-year CD	4.30%	$5,000
3-year CD	4.15%	$5,000
4-year CD	4.05%	$5,000
5-year CD	4.00%	$5,000

The blended starting yield across the five rungs is the simple average: 4.20 percent. That is lower than the 4.50 percent the depositor would earn by putting the full $25,000 into a one-year CD, and higher than the 4.00 percent from a single five-year CD. The blend sits in the middle by design — the ladder is a structural compromise, not a yield maximizer.

Year 1 maturity. The 1-year CD matures and returns $5,225 (principal plus approximately $225 in interest). The depositor reinvests the full amount into a new 5-year CD at whatever the prevailing 5-year rate is on that date. If the Federal Reserve has begun cutting rates and the 5-year CD rate has dropped to 3.75 percent, the new rung locks in 3.75 percent for five years. The ladder now consists of four original CDs (with 1, 2, 3, and 4 years remaining) plus one new 5-year CD.

Year 2 maturity. The original 2-year CD matures. Same decision: reinvest into a fresh 5-year CD at the then-current rate, or withdraw if the cash is needed. Suppose the depositor needs $3,000 for an unplanned car repair. They take $3,000 from the maturing rung and reinvest the remaining $2,430 (principal plus accrued interest minus the withdrawal) into a 5-year CD. The ladder continues with slightly unequal rung sizes — a common outcome in practice.

Years 3 through 5. The same process repeats. By the end of year five, every original rung has matured and been replaced. The ladder is now a series of five rolling 5-year CDs, each locked at the 5-year rate that prevailed in the year it was opened. The blended rate across the five rungs is the average of five different vintages — a natural hedge against the depositor having locked in at an unusually high or unusually low moment.

The total interest earned over the five-year period depends on the rate path, but in the scenario above (starting rates as shown, with the Fed cutting 75 basis points over the period), the ladder produces approximately $4,800 to $5,100 in cumulative interest on the $25,000 balance, compared with roughly $4,500 to $4,700 from a HYSA that follows the rate down and roughly $5,300 from a single 5-year CD locked at the initial 4.00 percent rate held to maturity. The ladder lands between the two single-product alternatives — more than the HYSA in a cutting cycle, less than the locked 5-year CD, but with annual liquidity access that the locked CD does not offer.

Rung spacing: which intervals and why it matters

The standard five-rung annual ladder — rungs at 1, 2, 3, 4, and 5 years — is the most commonly discussed construction, but it is not the only option and is not always the best fit.

Short-rung ladder: 3-month, 6-month, 1-year, 2-year, 3-year. This construction shortens the total ladder duration from five years to three years and provides a maturity event every few months in the early period. The advantage is more frequent liquidity access — the depositor gets the 3-month rung back within 90 days and the 6-month rung within 180 days, which is useful for a household that may need cash on a shorter horizon. The cost is a lower blended yield, because the two shortest rungs earn less than longer-term CDs. In the mid-2026 rate environment, a 3-month CD yields approximately 4.40 to 4.55 percent — which, in the current inverted-curve environment, is actually close to or above the 5-year rate. This anomaly makes the short-rung ladder particularly attractive when the curve is inverted, because the depositor captures short-term yields that are higher than long-term yields and gets more frequent liquidity.

Standard ladder: 1-year, 2-year, 3-year, 4-year, 5-year. The default construction. Annual maturities, five-year duration. Appropriate for capital the household is confident it will not need for at least twelve months and probably not for several years. The balance between yield capture and liquidity is moderate.

Extended ladder: 1-year through 7-year or 10-year. Some banks and credit unions offer terms longer than five years, and a few brokered CDs are available at seven or ten years. The extended ladder captures slightly more yield on the longest rungs but increases the duration risk — a 10-year CD locked at 4.00 percent looks painful if rates rise to 6.00 percent in year three. Extended ladders are most appropriate for depositors with very long horizons (college savings, structured retirement income) and high confidence that the capital will not be needed ahead of schedule.

Bullet ladder (a related structure). Not a true ladder in the staggered-maturity sense, but worth knowing: a bullet ladder stages the opening dates of several CDs that all mature on the same future target date — a house down payment, a tuition bill, a wedding. Spacing the purchases dollar-cost-averages the rate the depositor locks in, while aligning every maturity to the single moment the cash is actually needed.

The choice of rung spacing is ultimately a question about the household’s liquidity needs and rate-environment expectations. Households that want quarterly access use short rungs. Households that can tolerate annual access and want to maximize fixed-rate capture use the standard ladder. Households with decade-scale horizons consider extended rungs. The emergency fund math guide walks through how to determine what portion of a household’s cash belongs in fully liquid positions versus structures like CD ladders that trade some liquidity for yield.

When the yield curve is inverted — should you still ladder?

Between late 2022 and mid-2026, the US Treasury yield curve has been persistently inverted or nearly flat, with short-term rates exceeding long-term rates for extended stretches. This inversion has affected CD rates directly: in many periods during 2024 and 2025, a 1-year CD paid more than a 5-year CD. The inversion challenges the standard rationale for CD laddering, which assumes that locking longer earns more.

The structural value of a ladder during inversion is not about capturing a long-term yield premium — that premium does not exist when the curve is inverted. Instead, the value shifts to rate-locking insurance. When the yield curve is inverted, it is typically because the market expects the Federal Reserve to cut short-term rates in the near future. The elevated short-term rates are the current moment; the lower long-term rates reflect the market’s view of where rates will settle over the coming years. By locking in even a portion of the current elevated short-term rates for multi-year terms, the depositor is capturing today’s high rates before the expected cuts arrive.

A modified approach during inversion: instead of the standard 1-through-5 spacing, the depositor can weight the ladder toward shorter-to-medium maturities — for example, rungs at 3 months, 6 months, 12 months, 18 months, and 24 months. This captures the elevated short-term rates at their peak (the 3-month and 6-month rungs), locks some of the rate for medium terms (the 12-month and 18-month rungs), and limits long-term duration exposure (the longest rung is only 24 months, not 60). As each short rung matures, the depositor can evaluate whether rates have fallen and whether extending into a longer-term CD at the then-current rate makes sense.

The data supports this approach. According to FDIC rate survey data, the national average 12-month CD rate peaked at approximately 1.86 percent in early 2024 and has remained above 1.70 percent through mid-2026, while the national average 60-month CD rate has remained in the 1.35 to 1.45 percent range — roughly 30 to 40 basis points below the 12-month rate. The top-of-market rates from online banks show the same inversion, with the best 1-year CDs at 4.50 percent and the best 5-year CDs at 4.00 percent in May 2026. A depositor who built a standard 5-year ladder a year ago locked in lower rates on the longest rungs than on the shortest — but those locked rates still look attractive compared with the HYSA rate if the Fed has since begun cutting.

The answer to “should you still ladder when the curve is inverted” is: yes, but modify the spacing. The standard 1-through-5 construction assumes a normal curve and can be suboptimal during inversion. A compressed-spacing ladder that favors the part of the curve where rates are highest captures more of the current yield environment.

Early withdrawal penalties by institution

Breaking a CD before maturity triggers an early withdrawal penalty that reduces or eliminates the interest earned. The penalty structure varies by institution and by term length, but a few patterns are standard across the industry. Based on published penalty schedules from major issuers as of mid-2026:

Institution	CD term	Early withdrawal penalty
Ally Bank	12 months or less	60 days of interest
Ally Bank	13–24 months	90 days of interest
Ally Bank	25–36 months	120 days of interest
Ally Bank	37–60 months	150 days of interest
Marcus (Goldman Sachs)	All terms	270 days of interest (flat)
Discover Bank	Less than 12 months	3 months of interest
Discover Bank	12–60 months	6 months of interest
Discover Bank	60+ months	18 months of interest
Capital One	6–12 months	3 months of interest
Capital One	12–60 months	6 months of interest
Synchrony Bank	12 months or less	90 days of interest
Synchrony Bank	13–48 months	180 days of interest
Synchrony Bank	49+ months	365 days of interest

The penalty is deducted from accrued interest, not from principal — except in cases where the CD has been open for so short a time that accrued interest is less than the penalty amount, in which case the difference is deducted from principal. On a $5,000 CD at 4.50 percent APY, 6 months of interest is approximately $112.50. If the depositor breaks the CD after 8 months, they have accrued roughly $150 in interest; the penalty takes $112.50, leaving the depositor with $37.50 in net interest — a drastically reduced effective yield but not a principal loss.

One often-overlooked tax detail: the early withdrawal penalty is deductible on federal taxes as an adjustment to income (Form 1040 Schedule 1, line 18), regardless of whether the taxpayer itemizes. The deduction partially offsets the cost of the penalty, effectively reducing it by the taxpayer’s marginal rate. A taxpayer in the 24 percent federal bracket who pays a $150 early withdrawal penalty recovers $36 of that cost through the deduction, making the net after-tax penalty $114. It is a small consolation, but it is worth knowing before the depositor assumes the full penalty amount is the true cost.

CD ladder vs HYSA vs Treasury bills — the trade-off matrix

The three instruments compete for the same dollars — safe, short-to-medium-term cash that the household wants to earn a return on without exposure to equity-market risk. The choice depends on the household’s specific combination of liquidity needs, rate-environment expectations, tax bracket, and state of residence. The HYSA vs CD break-even calculator can run the comparison for a specific balance and term, but the structural trade-offs are consistent across scenarios:

Liquidity. The HYSA wins outright. Funds are available within 1 to 2 business days via ACH transfer, with no penalty for withdrawal. Treasury bills are nearly as liquid — they can be sold on the secondary market with T+1 settlement, though the sale price fluctuates with market rates. A CD ladder provides staggered liquidity: one rung matures per interval, and accessing cash between maturities costs the early withdrawal penalty. For a household that might need the cash on short notice and in full, the HYSA is the structurally correct vehicle.

Rate stability. The CD ladder wins. Each rung locks its rate for the full term; the blended rate across all rungs changes only as each rung matures and is reinvested. A HYSA rate can move — and has moved — by 100 basis points or more in a single year as the Fed adjusts policy. Treasury bills lock rates for their term (4 weeks to 52 weeks), but each reinvestment resets to the then-current rate. The ladder provides the most stable yield over a multi-year horizon, which is valuable to households that are planning against a specific future cash need.

After-tax yield. Treasury bills have a structural advantage in states with income taxes, because Treasury interest is exempt from state and local tax while CD and HYSA interest is fully taxable at both federal and state levels. The T-bills vs HYSA vs money market funds guide walks through the full after-tax comparison. For a household in California at the 9.3 percent marginal state rate, the state-tax exemption on Treasury bills is worth roughly 40 to 50 basis points of after-tax yield relative to a CD or HYSA at the same headline rate. For a household in Texas or Florida (no state income tax), the advantage disappears and the comparison is purely on pre-tax yield and liquidity.

FDIC/NCUA insurance. CDs and HYSAs at FDIC-insured banks (or NCUA-insured credit unions) are insured up to $250,000 per depositor per institution per ownership category. Treasury bills are direct obligations of the US government and carry no credit risk. Money market funds are SIPC-protected against broker failure but not against fund losses. For balances under $250,000, all three are effectively risk-free; for larger balances, Treasury bills and multi-bank CD ladders provide broader coverage than a single-bank HYSA.

Operational complexity. The HYSA is the simplest — one account, one rate, no maturity dates to track. A CD ladder requires opening multiple CDs, tracking maturity dates, deciding on reinvestment at each maturity, and potentially managing accounts at multiple banks. Treasury bills require a brokerage or TreasuryDirect account and a modest understanding of auction mechanics — the TreasuryDirect buying guide walks through both step by step. For a household that values simplicity and is not pursuing marginal yield optimization, the HYSA is the right default.

No-penalty CDs and brokered CDs — alternatives within the CD universe

Not all certificates of deposit follow the standard fixed-term, penalty-for-early-withdrawal structure. Two variants are worth understanding because they change the trade-off calculus in specific situations.

No-penalty CDs. Several online banks (Ally, Marcus, CIT Bank) offer CDs that can be redeemed before maturity without any early withdrawal penalty after a brief initial holding period — typically 6 or 7 days. The rate is fixed for the full term, giving the depositor rate certainty without the liquidity sacrifice of a traditional CD. The cost is a lower rate: no-penalty CDs typically yield 20 to 50 basis points less than traditional CDs of the same term at the same bank. In a rate-cutting environment, a no-penalty CD can be a powerful tool — the depositor locks the current rate with no downside if rates rise (they can break the no-penalty CD and reinvest at the higher rate) and keeps the locked rate if rates fall. The asymmetry makes no-penalty CDs particularly attractive at perceived rate peaks.

Brokered CDs. These are CDs issued by banks but sold through brokerage firms — Fidelity, Schwab, Vanguard, and others list brokered CDs from dozens of issuing banks on their platforms. The depositor buys the CD through their brokerage account, and the CD is held in the brokerage account alongside stocks, bonds, and other positions. The key differences from bank-direct CDs: brokered CDs can be sold on the secondary market before maturity (avoiding the early withdrawal penalty, but at a market price that may be above or below par depending on rate movements); the rates are sometimes lower than the best direct-from-bank offers because the brokerage acts as an intermediary; and the FDIC insurance applies to the underlying issuing bank, not to the brokerage, meaning the depositor needs to verify that each CD’s issuing bank is FDIC-insured and that the total holdings at any single issuing bank stay within the $250,000 coverage limit.

Brokered CDs are particularly useful for ladder construction because the depositor can build the entire ladder — five CDs from five different issuing banks at five different terms — within a single brokerage account. There is no need to open five separate bank relationships, track five different online banking logins, or manage five different maturity notification systems. The convenience is real, and for depositors who value operational simplicity, brokered CDs through a major brokerage are often the best way to implement a ladder.

Reinvestment strategy: auto-renew versus manual roll

When a CD matures, the depositor faces a choice: let the bank automatically renew the CD into a new CD of the same term at the bank’s then-current rate (the default setting at most banks), or have the matured funds deposited into a linked checking or savings account for manual redeployment.

Auto-renew is the path of least resistance. The matured CD rolls into a new CD of the same term, and the depositor does not need to take any action. The disadvantage is that the bank’s posted renewal rate may not be the best rate available — the depositor has not shopped the market and may be accepting a rate 25 to 75 basis points below what a competitor is offering. Most banks provide a grace period (typically 7 to 10 days after maturity) during which the depositor can change the auto-renew setting or withdraw the funds without penalty. If the depositor misses the grace period, the funds are locked into the new CD for its full term.

Manual roll requires the depositor to actively move the matured funds — either into a new CD at the same bank (if its rate is competitive), into a CD at a different bank, into a Treasury bill, or into a HYSA. The advantage is rate optimization: the depositor shops the current market and places the funds at the best available rate, which over a multi-year ladder lifecycle can add 25 to 50 basis points of blended yield compared with auto-renewal at a single bank. The disadvantage is that the depositor must track maturity dates and act within the grace period; forgetting a maturity date and missing the window means the funds auto-renew at a potentially suboptimal rate.

The recommended approach for a ladder: set all CDs to “do not auto-renew” and calendar each maturity date with a reminder 7 to 10 days in advance. At each maturity, check the current best CD rates (Bankrate and DepositAccounts.com are the standard rate-tracking aggregators), compare with the current HYSA and Treasury bill yields, and place the funds at the best available option for the longest rung of the ladder. This active management adds perhaps 30 minutes of work per maturity event — five to six hours per year for a five-rung annual ladder — and the yield pickup across a decade of reinvestment events is meaningful.

FDIC and NCUA insurance on CD ladders

Certificates of deposit at FDIC-insured banks are insured up to $250,000 per depositor per insured bank per ownership category. CDs at NCUA-insured credit unions carry equivalent coverage — $250,000 per member per insured credit union per ownership category. The coverage limit applies to the aggregate of all deposits at a single institution, including checking accounts, savings accounts, money market accounts, and CDs combined. A depositor with $200,000 in CDs and $75,000 in a savings account at the same bank has $275,000 in total deposits but only $250,000 of FDIC coverage; the remaining $25,000 is uninsured.

For CD ladders specifically, the insurance rules create two practical considerations.

Spreading across institutions for coverage. A depositor building a $250,000 ladder at a single bank is at the FDIC coverage limit. Any interest accrual pushes the total above $250,000, and the excess is technically uninsured. The prudent approach for larger ladders is to spread the rungs across multiple banks — each bank’s $250,000 coverage applies independently. A $500,000 ladder split across five banks at $100,000 per bank is fully insured at each institution. This multi-bank approach is one of the operational arguments for brokered CDs: the brokerage can place each CD at a different issuing bank and track the per-bank exposure automatically.

Ownership categories increase coverage. The FDIC insures $250,000 per ownership category at each bank. Common ownership categories include single accounts, joint accounts (one $250,000 per co-owner), revocable trust accounts (each unique beneficiary adds $250,000 of coverage up to five beneficiaries), and certain retirement accounts. A married couple with a joint account and two individual accounts at the same bank has three ownership categories and up to $750,000 in aggregate coverage at that single institution. Understanding ownership categories can eliminate the need to open accounts at multiple banks for many households. The FDIC’s Electronic Deposit Insurance Estimator (EDIE), available at fdic.gov, calculates the exact coverage for any combination of accounts and ownership categories.

Credit unions insured by the National Credit Union Administration follow an identical coverage structure: $250,000 per member per credit union per ownership category. The mechanics are the same as FDIC coverage in all material respects; the only difference is the insuring entity.

Tax treatment: ordinary income, 1099-INT, and the state-tax gap

Interest earned on CDs is taxable as ordinary income at the federal level. The interest is reported by the issuing bank on Form 1099-INT for each calendar year in which interest is credited, regardless of whether the depositor has withdrawn the interest or reinvested it. A CD that spans multiple calendar years generates a 1099-INT for each year’s portion of the accrued interest.

For a CD ladder, this means the depositor receives a 1099-INT from each institution where a CD is held, for each calendar year. A five-rung ladder spread across three banks generates three 1099-INT forms per year. The reporting is straightforward, but the volume of tax documents increases with the number of institutions in the ladder — another operational argument for consolidating the ladder through a single brokerage account that issues a single consolidated 1099.

The state-tax treatment of CD interest is where the comparison with Treasury bills and Treasury-only money market funds becomes material. CD interest is fully taxable at the state level in every state that levies an income tax. Treasury bill interest, by contrast, is exempt from state and local income taxes — a structural feature of US Treasury obligations codified in 31 U.S.C. Section 3124. For a household in New York (combined state and local marginal rate of approximately 10 to 12 percent for moderate earners) or California (top marginal state rate of 13.3 percent), the state-tax exemption on Treasury interest can be worth 40 to 70 basis points of after-tax yield. On a $100,000 ladder, that is $400 to $700 per year in additional taxes compared with holding the same balance in Treasury bills.

The practical implication: a CD ladder makes the most sense, on an after-tax basis, for households in low-tax or no-income-tax states (Texas, Florida, Nevada, Washington, Wyoming, South Dakota, Alaska, Tennessee, New Hampshire). For households in high-tax states, Treasury bills or a Treasury-only money market fund should be included in the comparison — the state-tax exemption may more than offset any headline-rate advantage the CD offers. The detailed comparison, with worked calculations for several state-tax scenarios, is in the T-bills vs HYSA vs money market funds guide.

Putting the pieces together — when a CD ladder is the right tool

A CD ladder is not universally the best savings vehicle. It is the right tool in a specific set of circumstances, and the wrong tool in others. The circumstances that favor a ladder:

The depositor has a medium-term horizon (2 to 7 years) with periodic but not continuous liquidity needs. The cash is not the emergency fund’s first tier — which should be in a fully liquid HYSA or money market account — but rather the second or third tier of savings that the household wants to earn a competitive fixed rate on while maintaining some structural access.

The depositor expects interest rates to decline. A CD ladder locks in current rates across multiple rungs. In a falling-rate environment, the locked rungs continue earning their original rates while HYSAs and new CDs drop. The scenarios where that rate-lock value is highest — a clear expectation of Federal Reserve cuts, a multi-year horizon, and cash the household will not need all at once — are the ones that most justify the ladder’s operational overhead.

The depositor is in a low-tax or no-tax state. Without the state-tax disadvantage relative to Treasury bills, the CD’s simplicity and FDIC insurance make it competitive on an after-tax basis.

The depositor values rate predictability over marginal yield. The CD ladder’s blended rate is known in advance (for the existing rungs) and changes only at maturity-and-reinvestment events. A HYSA rate is uncertain from month to month. For a household budgeting against a future cash need — a home down payment in four years, a car purchase in three years, a child’s college expense in five years — the predictability of the ladder’s yield can be more valuable than the HYSA’s slightly higher average rate in some environments.

The circumstances that argue against a ladder: very short horizons (under 12 months), where a HYSA or money market fund provides the same or better yield with full liquidity; very large balances in high-tax states, where Treasury bills’ state-tax exemption dominates; or a rising-rate environment where the depositor would prefer to stay in floating-rate vehicles that follow the Fed up rather than lock in today’s rates.

The CD ladder is a tool, not a philosophy. It belongs in a household’s savings architecture alongside the HYSA, the Treasury bill, and the money market fund — each serving the portion of the household’s cash that matches its structural trade-offs. The full comparison of where dollars earn across all four vehicles provides the framework for allocating cash across the menu.

Sources

• CD rate data and current top offers: Bankrate CD rate tables and DepositAccounts.com CD rates.
• FDIC insurance rules and coverage calculator: FDIC — Deposit Insurance FAQs and EDIE calculator.
• NCUA share insurance: NCUA — Share Insurance Fund.
• Early withdrawal penalty deduction: IRS — Form 1040 Schedule 1, line 18 and IRS Publication 550 — Investment Income and Expenses.
• Treasury interest state-tax exemption: 31 U.S.C. § 3124.
• FDIC national rate data (historical and current): FDIC — Weekly National Rates and Rate Caps.
• Treasury yield curve data: U.S. Department of the Treasury — Interest Rate Statistics.
• Early withdrawal penalty schedules: Published rate and penalty disclosures from Ally Bank, Marcus by Goldman Sachs, Discover Bank, Capital One, and Synchrony Bank.

Rate figures cited in this guide reflect the mid-2026 rate environment and are illustrative of current conditions. Rates change frequently; verify current rates at the linked sources before making any deposit decision. The structural mechanics of the CD ladder — staggered maturities, reinvestment at maturity, FDIC coverage rules, and tax treatment — are stable regardless of the absolute rate level.