Bond Ladder vs Bond Fund: What's the Difference?

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Two investors both put £100,000 into UK government bonds. One buys ten individual gilts, each maturing in a different year from 2027 to 2036. The other buys a single gilt fund. On paper they hold almost the same thing. In practice they have bought two quite different experiences, and the gap shows up most clearly when interest rates move.

The short version: a bond ladder is a set of individual bonds with staggered maturity dates that you hold, in most cases, until each one repays its face value. A bond fund is a pooled vehicle holding hundreds or thousands of bonds that is bought and sold continuously, so it never reaches a maturity date of its own. One gives you fixed dates and fixed sums. The other gives you diversification and simplicity, at the cost of never quite "maturing".

This post covers how each structure works, why they react differently to a rate shock, the trade-offs between them, the UK tax treatment, and how to represent either one in a retirement plan.

What a Bond Ladder Is

A bond ladder is built by buying several individual bonds with maturity dates spaced out at regular intervals. A simple ten-year gilt ladder might hold:

• A gilt maturing in 2027
• A gilt maturing in 2028
• A gilt maturing in 2029, and so on through to 2036

Each holding is a "rung". As the 2027 rung matures, it repays its face value in cash. That cash is then either spent, if the ladder exists to fund spending, or used to buy a new rung at the long end of the ladder, a gilt maturing in 2037, which keeps the structure rolling forward.

The defining feature is that each rung has a known maturity date and a known redemption value. Barring default, which for gilts has never happened, you know that on a specific date in 2027 you will receive £100 for every £100 of face value you hold, whatever the market price of that bond does in the meantime.

What a Bond Fund Is

A bond fund, or bond ETF, pools money from many investors and buys a large portfolio of bonds, often hundreds or thousands, tracking an index or following a manager's mandate. When you buy a share of the fund you own a slice of that whole portfolio.

Crucially, the fund does not hold its bonds to maturity and then wind down. It maintains a roughly constant profile. A short-dated gilt fund always holds gilts with a few years left to run: as its bonds age and approach maturity, the fund sells them and buys newer ones to keep the average maturity stable. The fund is therefore always somewhere in the middle of its bonds' lives, and it never delivers a single lump sum of face value on a set date. Its price is whatever the underlying bonds are collectively worth that day, recalculated continuously.

The Core Difference: A Maturity Date vs a Moving Target

Almost everything else follows from this one point.

An individual bond held to maturity has a pull to par: however far its price falls or rises along the way, it converges on its £100 face value as the maturity date approaches, because that is the contractual sum repaid. If you hold the rung to the end, the price moves in between are paper movements that never turn into a realised loss, again barring default.

A bond fund has no maturity date and therefore no pull to par. It has a duration, a measure of how far its price moves when interest rates change, and that duration stays roughly constant over time because the fund keeps rolling into new bonds. The interest-rate risk never runs off. There is no date on which the fund hands you back a known sum.

This is why the two structures feel so different in a downturn.

Worked Example: A Rate Shock

Take 2022, when the Bank of England raised its base rate quickly and gilt prices fell hard, longer-dated ones most of all. What Are Gilts and Bonds? walks through the price and yield mechanics behind that move, and The 60/40 Portfolio and the Myth of Uncorrelated Returns covers why bonds and equities fell together.

The ladder holder. The market value of the ladder dropped on paper, because every rung was now worth less than before. But the near rungs were close to maturity, so their prices had already largely pulled back toward £100. As each rung matured over the following years, it redeemed at face value on schedule. An investor who did not sell realised no loss on the rungs they held to maturity, and the reinvested cash then went into new rungs at the higher yields now on offer.

The fund holder. The fund's price fell by an amount roughly in line with its duration: a fund with a duration of eight years loses in the region of 8% for each one percentage point rise in yields, and 2022 brought several points of movement. Because the fund never matures, there was no specific date on which its price was contractually pulled back to a known value. The value recovers over time as the fund's holdings roll into higher-yielding bonds, and as a rough rule that recovery takes about the fund's duration to play through, but it happens through market pricing rather than a redemption event.

Neither investor was necessarily better off overall. The fund holder held a more diversified portfolio and had no reinvestment admin. The ladder holder had certainty about the sums arriving on each maturity date, which matters a great deal if that money was earmarked for something specific.

Where Each One Fits

The structures suit different jobs.

A ladder is generally used for matching known future outflows. If you know you need £20,000 a year for the first five years of retirement, or school fees due in 2029, 2031 and 2033, a ladder can be built so that a rung matures just before each of those dates. The value of the rung on its maturity date is known today, so the plan does not depend on what the bond market is doing that year. This idea is sometimes called liability matching, and a version used to cover the early, most vulnerable years of retirement is sometimes called a "bond tent".

A fund is generally used for a general-purpose fixed income allocation. If the bond holding exists to dampen portfolio volatility, spread risk across many issuers, and be rebalanced against equities each year, a fund does that with a single holding, no reinvestment decisions, and instant diversification across credit and issuer risk. For smaller sums a fund is also usually the only practical option, since a diversified ladder needs enough capital to make each rung worth dealing.

The Trade-offs

On cost, holding individual gilts avoids an ongoing fund charge, but each purchase carries a dealing fee, and a low-cost gilt fund's annual charge is often small enough that the running-cost gap is narrow. The Real Cost of Investment Fees covers how to weigh charges like these over long periods.

Tax Notes for UK Investors

Inside an ISA or a SIPP none of the following applies, because gains and income in those wrappers are not taxed.

Outside a tax wrapper, the treatment differs by structure:

• Individual gilts. Gains on individual gilts are exempt from Capital Gains Tax, whatever account they sit in. Coupon income is taxable as savings income, subject to the Personal Savings Allowance and the starting rate for savings. What Are Gilts and Bonds? explains the CGT carve-out in detail.
• Bond funds. A fund that holds more than 60% in bonds and cash is treated as paying interest rather than dividends, so its distributions are taxed as savings income. Gains on the fund's units are subject to Capital Gains Tax in the normal way, unlike gains on the individual gilts held inside it. The CGT exemption that applies to a gilt held directly does not pass through a gilt fund.

This is a description of the rules, not a recommendation. Which structure leaves someone better off after tax depends on their income, their allowances, how long the money can be committed, and the yields available at the time. A regulated financial adviser or a tax adviser can look at a specific situation.

Two Common Misconceptions

"A bond fund is just a ladder that someone else runs for me." Not quite. A fund keeps a roughly constant duration and never hands back a lump of face value on a date, so it never gives you the maturity certainty that is the whole point of a ladder. It is closer to a permanently rolling portfolio than to a ladder with an end.

"Individual bonds cannot lose money." They can. If the issuer defaults, or if you sell a rung before maturity at a price below what you paid, the loss is real. The "no loss" property of a ladder applies only to rungs held to maturity, and only to issuers that do not default. It is a strong property for gilts and a weaker one for lower-rated corporate bonds.

How Scenarios Helps

Scenarios models fixed income as a single bond asset class with its own expected return, volatility, and correlation to other assets. It does not model individual bonds, maturity dates, or a literal ladder, so the ladder-versus-fund choice is not something the engine represents directly. What it can do is show how the size of a bond allocation, and how that allocation shifts as retirement approaches, affects the range of outcomes across 1,000 simulated market paths.

If a ladder exists specifically to fund known spending in particular years, the closest way to represent it in a plan is as guaranteed income for those years, matching each rung's maturity value to the year it is needed, rather than as a volatile bond allocation that might be worth more or less when the money is due. Modelling it that way keeps the certainty the ladder was built to provide. What Is Cash Flow Modelling? covers the year-by-year approach that makes this kind of matching visible.

You can build a free plan and test how different bond allocations, and different amounts of guaranteed income, change the picture for your own numbers.