Bond Ladder

Picture each bond as a rung. A five-year ladder might hold equal amounts maturing in one, two, three, four and five years. Each rung pays interest along the way, and when the shortest one matures you either use the cash or buy a new five-year bond, so the ladder keeps its length. That is a rolling ladder, and its average maturity stays near the middle, three years in this case.

The design handles two opposite risks at once. When rates rise, the market value of the rungs you own falls, but you reinvest only one rung at a time, and that rung now earns the higher rate. When rates fall, most of the ladder keeps its old, higher yields, and only the maturing slice has to accept less. You do not have to guess where rates are heading.

Held to maturity, a high-quality rung returns its face value on schedule however its price moved in between, as long as the issuer pays. That makes a ladder useful for money with a date attached: tuition, a house down payment, or the first decade of retirement spending.

Start with the job the money has to do, then work backward to the pieces. A reserve you plan to roll forever needs even rungs of the same size. An income ladder needs each rung sized to one year’s spending gap, less the coupons that later rungs will pay that year. Treasury auctions new notes with 2-, 3-, 5-, 7- and 10-year terms, so the in-between years usually come from older issues bought through a broker.

A rolling ladder is a standing reserve. Its maturities are reinvested, so it behaves like a steady bond holding with a known average maturity, and its income floats up or down with rates over time.

An income ladder, also called a liability-matching ladder, is built to be spent: each year’s maturing rung, plus that year’s coupons, covers the gap between spending and other income. A common use is bridging the years between retiring and claiming Social Security at a later age, when the larger benefit takes over. The ladder shrinks to nothing on purpose, which is also how it fits the cash and bond layers of a bucket strategy.

Two variations serve narrower goals. A TIPS ladder uses inflation-protected rungs for spending that must keep pace with prices. For exact sums on exact dates, some investors use STRIPS, the zero-coupon pieces of Treasury notes and bonds, which pay nothing until maturity and can be bought and held only through a bank, broker or dealer.

A bond mutual fund or ETF is the simpler way to own bonds: one holding, broad diversification, and a manager who reinvests for you. What it cannot give you is a maturity date, so its value on the day you need cash depends on rates that day. A ladder turns that uncertainty into a schedule.

An individual ladder is not a way to earn more. A rolling ladder with a three-year average maturity carries about the same interest-rate exposure as a fund holding similar bonds, and it adds dealer markups on every purchase. The case for it is control over timing, credit and taxes, not a higher expected return. Funds are usually the better fit for small amounts, or for bonds that need wide diversification, such as high-yield corporates.

A ladder is a schedule of cash, so most problems come from letting it drift. Keep a list of what matures when, match each rung to a real bill, and decide before each maturity whether the money is spent or rolled to the far end. Otherwise maturing cash sits idle, or rungs stop lining up with the expenses they were bought to cover. The other common slips happen when you choose the bonds and the account: