Bond Ladders and CD Ladders: Practical Income Flooring for Retirement

Most retirees have a spending gap.

Social Security and any pension cover part of annual expenses. The rest has to come from somewhere — and the question is whether that "somewhere" behaves predictably or depends on what the market is doing the day you need money.

A bond or CD ladder solves that problem. It is a portfolio of individual fixed-income securities with staggered maturity dates — one maturing each year, each delivering a predictable cash payment timed to cover the spending gap. No guessing what the market will do. No selling equities in a down year. Just calendar-driven income.

The Core Mechanics

A ladder divides a fixed capital amount across multiple securities, each maturing in a successive year. A five-rung annual ladder splits $100,000 into five $20,000 positions maturing in years 1 through 5. When the year-1 rung matures, the proceeds are spent to cover the annual spending gap and the ladder is extended by purchasing a new 5-year instrument at the long end — rolling the ladder forward by one year.

The key property is that no rung is ever more than its own maturity away from liquidity. You are never forced to sell at market prices; you wait for par. And the rolling structure means only one-fifth of the portfolio reinvests at any given year's interest rates — dramatically reducing the impact of rate changes compared to a single long-term bond.

Treasury Ladder vs. CD Ladder

Both instruments solve the same problem. The choice between them hinges on three practical factors: state taxes, liquidity, and where you live.

Treasury interest is exempt from state and local income tax. In California, New York, New Jersey, or any other high-income-tax state, that exemption materially improves after-tax yield. A Treasury yielding 4.0% in a state with 9% income tax has an after-tax equivalent of 4.0%; a CD at the same nominal rate yields roughly 3.64% after state tax. The spread compounds across a multi-year ladder and across the full portfolio.

CDs offer FDIC insurance — $250,000 per depositor, per institution, per account ownership category. A large CD ladder must be spread across multiple banks to stay within coverage limits. Brokered CDs purchased through a brokerage account count per issuer, making multi-bank diversification straightforward at a single custodian.

Liquidity differs. Treasuries trade on a secondary market and can be sold before maturity — though the price will reflect current rates and may differ from par. CDs purchased directly from a bank carry early withdrawal penalties, typically 90–180 days of interest. Brokered CDs trade on secondary markets like Treasuries. For a well-planned ladder where maturities match spending needs, early withdrawal should rarely be necessary.

In April 2026, competitive rates are approximately 3.9–4.15% across the 1-to-5-year range for both instrument types, with CDs offering a slight nominal premium in some terms.

Sizing the Ladder: The Spending Gap Method

The most common sizing mistake is building a ladder to cover total annual spending. That over-allocates to fixed income and leaves too little in equities for long-term growth.

The correct approach is to floor only the spending gap — the portion of annual expenses not already covered by guaranteed income sources. Social Security, pensions, and annuity income already behave like ladder rungs: they arrive on schedule regardless of markets. The ladder only needs to cover what those sources do not.

Step 1 — Calculate the annual spending gap: Total annual spending minus Social Security, pension, and any other fixed income equals the annual floor amount.

Step 2 — Decide on ladder length: Most practitioners target 3–10 years. A 3-year short ladder ensures you never need to sell equities during a downturn that lasts up to 3 years. A 10-year ladder provides deeper protection but locks more capital at fixed rates and increases inflation exposure.

Step 3 — Size the capital allocation: For a simple equal-rung ladder, multiply the annual gap by the number of years. For a present-value approach — more accurate for longer ladders — discount each future rung by the applicable yield at that maturity. Longer rungs cost less capital today because the purchase price is discounted.

Step 4 — Include projected RMDs: Required minimum distributions will fund spending whether you plan for them or not. Subtracting projected RMD amounts from the annual spending gap further reduces how much ladder capital is needed — and avoids double-counting income.

Where to Hold the Ladder

Account location affects after-tax yield and interacts with RMDs.

Taxable brokerage account: Interest is taxable annually. Treasuries avoid state tax. Holding rungs here funds spending directly without triggering IRA withdrawals or RMDs. Best for the shortest rungs (years 1–3) where immediacy and simplicity matter.

Traditional IRA or 401(k): Interest compounds tax-deferred with no annual tax drag. The state-tax exemption on Treasuries disappears inside an IRA — all IRA withdrawals are ordinary income regardless of the underlying instrument. IRA-held ladders are subject to RMD rules; rungs maturing inside an IRA satisfy RMDs automatically if the maturity amount equals or exceeds the RMD.

Roth IRA: Interest grows and distributes entirely tax-free. Roth-held ladders remove the assets from future RMD calculations. Best for longer rungs (years 5–10+) where tax-free compounding on interest provides the greatest benefit.

Coordination with the Broader Portfolio

A ladder is not a standalone investment — it is the fixed, predictable layer of a two-part retirement income structure. The ladder floors the spending gap; the remaining portfolio stays in equities and grows for inflation protection and long-term spending.

The critical property of this structure is sequence-of-returns insulation. In a severe market downturn in years 2–4 of retirement — historically one of the most damaging periods for a portfolio — a retiree with a funded ladder does not sell equities. They spend the maturing rungs. The equity portfolio stays intact and recovers. Without the ladder, the same retiree sells equities at depressed prices to fund living costs, permanently reducing the portfolio's recovery potential.

This makes the ladder most valuable not at its interest yield but at its option value — the protection it provides against being forced to liquidate growth assets at the worst possible time.

Ladder vs. Bond Fund

A bond fund and a bond ladder both hold bonds, but they behave differently in retirement. A bond fund has no maturity date — if rates rise and prices fall, the fund's NAV declines, and a retiree selling fund shares to fund spending realizes that loss. A ladder's individual bonds mature at par regardless of market conditions. The retiree who waits for maturity never experiences a price loss on principal.

Bond funds offer diversification, professional management, and liquidity. Ladders offer certainty of principal return and calendar-driven cash flow. For the income flooring role — where certainty matters more than diversification — individual ladder rungs are typically preferred.

Important Notes

• Treasury interest is federally taxable, state-exempt. Report on Schedule B.
• CD interest is taxable at both federal and state levels in the year it accrues, even for multi-year CDs that pay interest at maturity. (Exception: zero-coupon bonds accrue OID annually whether or not cash is received.)
• I-Bonds are a Treasury instrument with inflation-adjusted returns — a useful additional rung — but capped at $10,000/year per individual through TreasuryDirect.
• Brokered CDs may trade at a discount on secondary markets; early selling before maturity may return less than par.
• This is education, not individualized investment or tax advice.

In ModernRetire

The Income Floor Planner under Strategy -> Income is built for this:

1. Enter Social Security, pension, and any other fixed income to calculate your annual spending gap.
2. Choose ladder length (3, 5, 7, or 10 years) and instrument type (Treasury, CD, or blended).
3. See the total capital required, projected blended yield, and annual cash generated per rung.
4. View how the ladder interacts with projected RMDs — identifying years where RMD alone covers the gap and no ladder rung is needed.
5. Compare the floored structure against a 100% equity withdrawal approach using Monte Carlo simulation to quantify sequence-of-returns protection.