Bond Ladder Calculator

A staircase of maturities, by design

A bond ladder spreads your money across bonds that come due in different years instead of betting it all on one maturity date. You buy a rung for each year, and as the nearest bond matures you reinvest the principal at the far end of the ladder. The structure does two useful things at once: it hands you a predictable slice of cash every year, and it keeps you from guessing where interest rates are headed. This tool sizes each rung and shows the annual coupon income the whole ladder throws off.

Why laddering beats a single bond or a bond fund

If you put everything into one ten-year bond, all your principal is locked up until year ten and exposed to a decade of rate risk if you ever need to sell early. A bond fund avoids the lock-up but never matures, so its share price falls when rates rise and you can lose principal at the worst time. A ladder threads the needle. Because you intend to hold each rung to maturity, you get your face value back on schedule regardless of what rates do in between, and a portion of the ladder reprices every year as it rolls over.

A $500,000 ten-rung Treasury ladder at 4.5%

Suppose you put $500,000 into a ten-rung ladder at an average yield of 4.5%. The calculator divides the total evenly, so each rung holds $50,000, with maturities staggered one year apart from year one through year ten. The full ladder generates $500,000 times 4.5%, or $22,500 a year in coupon income. On top of that, $50,000 of principal matures every year and becomes available, either to spend or to reinvest into a fresh ten-year rung at whatever rate prevails then.

What the average yield hides

This calculator uses a single average yield to keep the planning simple, but in a real ladder each rung carries its own yield set by the shape of the curve on the day you buy. When the yield curve is upward sloping, longer rungs pay more, so a ten-year rung might yield well above a one-year rung and the 4.5% average smooths over that spread. When the curve is inverted, as it has been in recent years, short rungs can out-yield long ones, which actually rewards a shorter ladder. The takeaway is to treat the average as a planning figure and check the live yield at each maturity before you buy.

One tax note worth building into the plan. A Treasury ladder produces interest that is fully taxable at the federal level but exempt from state and local income tax, which is a real edge for retirees in high-tax states. A municipal-bond ladder flips that: the interest is generally free of federal tax and often state tax in your home state, which suits high-bracket investors in taxable accounts. The right wrapper depends on your bracket and your state, so the $22,500 of pretax income above can land very differently after tax depending on which bonds fill the rungs.

How wide should I make the ladder?

It depends on what you are solving for. A short one-to-five-year ladder keeps you nimble and reprices quickly, which is helpful when you expect rates to rise or you may need the cash soon. A longer one-to-ten-year ladder locks in today's yields for longer and smooths income, which suits a retiree who wants stability. Many people split the difference and run a rolling ladder out to ten years so that one rung always matures within twelve months, giving them annual liquidity without sacrificing the longer yields.

Treasuries, CDs, or municipals for the rungs?

All three ladder well, and the choice is mostly about taxes and credit. Treasuries are the safest and are state-tax-free, and you can buy them with no fee at TreasuryDirect or through a brokerage. Brokered CDs are FDIC-insured up to the limits and sometimes yield a touch more, but watch for call features that can end a rung early. Municipals make sense chiefly for investors in high federal brackets holding the ladder in a taxable account, where the tax exemption can lift the after-tax yield above a comparable Treasury.