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How bond ladders work
A bond ladder spreads maturities across years so cash returns on a schedule and you reinvest at whatever rates exist then - the mechanics, the after-tax angle, and when it fits.
A bond ladder is a set of bonds with maturities spread evenly across future years - a rung maturing in 2026, another in 2027, another in 2028, and so on. As each rung matures, its principal comes back as cash, and you decide what to do with it: spend it, or reinvest it in a new long rung at whatever rates exist then. It is one of the oldest and most durable tools for turning a pile of bonds into a predictable income schedule.
Why a household builds one
A ladder solves two problems at once. First, reinvestment-rate risk: instead of putting everything into one maturity and being forced to reinvest the whole sum at a single moment's rates, you only ever reinvest one rung at a time, averaging across the rate environment. Second, liquidity scheduling: you know exactly when principal contractually returns, which is invaluable for funding known future spending - tuition, a purchase, the early years of retirement.
It also imposes discipline. A ladder gives you something to do with maturing cash on a schedule, rather than leaving you to time the bond market.
The mechanics, with a number
Say you have $500,000 to ladder over five years. You buy roughly $100,000 maturing in each of the next five years. When the 2026 rung matures, you either spend the $100,000 or buy a new rung at the far end - a 2031 bond - keeping the ladder five rungs long. Rung spacing (annual vs. every other year) and length (5 years vs. 10) trade liquidity against yield: longer rungs usually pay more but lock the money up longer.
The instruments inside the rungs carry different tax character, and that changes the real comparison: Treasuries are state-tax-exempt, in-state munis are often fully exempt, and corporates are fully taxable. Two rungs quoting the same yield are not equivalent until you compare them after tax. (See the tax character of investment income.)
How Ironlake treats it
For a household that has imported bond positions, Ironlake's Fixed Income surface builds the maturity ladder from the bonds you already hold - showing when par returns by year, portfolio duration and convexity, credit-quality distribution, after-tax and tax-equivalent yields with correct state handling, and call-risk flags. When a rung matures or a bond is called, the Bond Reinvestment Workbench pre-loads the proceeds and lets you compare candidate replacements after tax and for ladder fit, then save the reasoning to your decision journal.
- See the after-tax math the ladder relies on: tax character and after-tax math and the tax character of investment income.
Honest limits
A ladder is a structure, not a forecast - it does not predict where rates go, it just stops you from betting everything on one moment's rates. Callable bonds can return principal early and disrupt the schedule, which is why call risk is surfaced separately. And the fixed-income analytics need real bond data (maturity, coupon, rating) to be meaningful; where a field is missing, Ironlake flags the gap rather than guessing. The tool shows the schedule and the after-tax math; the reinvestment choice is yours.