CD Ladder Builder

In 2026, a near-retiree shopping fixed income wants three things at once: maximum yield, annual liquidity, and FDIC protection. A single 5-year CD gives yield and protection but no liquidity. A high-yield savings account gives liquidity and protection but lower yield. The CD ladder solves all three by structuring the portfolio across staggered maturities - one rung matures every year while the others continue earning the longer-term rate.

The mathematical basis of laddering is the term structure of interest rates - the relationship between yield and maturity. In a normal yield curve (Treasury 1y < 5y < 10y, as in 2017-2019 and 2026), locking in longer maturities pays more. The ladder strategy uses long maturities for higher yield while staggering them to retain some liquidity. This is mathematically related to duration matching in fixed-income portfolio theory, formalized by Frederick Macaulay in 1938.

Fibonacci's 1202 Liber Abaci contained the first European compound-interest tables and a chapter on multi-period investment math that is essentially a primitive ladder. The modern CD ladder was popularized by Vanguard founder John Bogle in his 1992 bookBogle on Mutual Funds, where he recommended fixed-income investors split holdings across short-, intermediate-, and long-term bond funds - a strategy that translates directly to a 1-3-5-7-10-year CD ladder.

The Federal Reserve's monetary policy directly shapes ladder construction. During the 2022-2024 tightening cycle (Fed funds 0% → 5.5%), CD rates surged but the yield curve inverted (2-year > 10-year) - making short ladders more attractive. By May 2026, after the early-2026 cuts brought Fed funds to 4.25-4.50%, the curve has un-inverted and traditional 1-5y ladders again produce the best risk-adjusted yield. The widget's preset rates reflect this 2026 normal-curve environment.

FDIC insurance ($250,000 per depositor per bank per ownership category, since 2008) is the ladder's safety net. A common construction error is putting a $1,000,000 ladder at one bank - 75% of it would be uninsured. The fix is to spread rungs across 4-5 banks (Marcus, CIT, Ally, Discover, Synchrony, Capital One are common picks). Brokered CDs through Fidelity or Schwab automate this distribution under one account, though they typically pay 10-20 bps less than direct-bank CDs because the brokerage takes a small spread.

Tax treatment of CD ladder interest is identical to any other CD: ordinary income, reported on Form 1099-INT, taxed each year the interest accrues (not at maturity). Holding the ladder inside a Traditional IRA defers the tax to retirement withdrawals; a Roth IRA eliminates the tax entirely after age 59½. State tax treatment varies - California, New York, and New Jersey all tax CD interest as ordinary income, which is why many high-tax-state investors prefer a Treasury bill ladder instead (T-bills are state-tax-exempt).

By 2026 the most common ladder structures in retirement portfolios are: 5-year ladders with $25,000-$100,000 total (entry-level retirees), 10-year ladders with $250,000-$1,000,000 (mid-tier), and 20-year barbell ladders (heavy at year 1 and year 20, light in the middle) for $1M+ portfolios that prioritize both immediate cash needs and long-duration yield. The widget's three presets cover the first two; the Long 10-Year preset approximates the barbell variant.