Individual Bonds vs. Bond FundsStart here
One matures and one does not. That single difference explains almost every argument about which is better — and it matters far less than both sides claim.
The argument, stated fairly on both sides
- The case for individual bonds: a bond matures. Whatever happens to its price meanwhile, you get par back on a known date, so a rate rise is a paper loss you can wait out.
- The case for funds: diversification, no minimum sizes, no reinvestment work, and access to markets an individual cannot trade at reasonable cost.
- Both are true. The argument goes wrong when the first is overstated into a claim that individual bonds carry no interest-rate risk. They carry exactly the same risk; it is experienced differently.
Does holding to maturity protect you?
- In nominal terms, yes. Absent default you receive par, and the interim price is irrelevant if you genuinely never sell.
- In economic terms, no. If rates rise, your capital is locked into a below-market yield for years. The loss is real — it shows up as opportunity cost rather than as a price on a statement.
- The comparison is not "loss versus no loss", it is "a visible mark-to-market loss versus an invisible opportunity cost of the same size". A bond fund shows you the number; a held bond does not.
- Where holding to maturity genuinely helps is behavioural and cash-flow matching: a known amount on a known date, matched to a known liability. That is a real advantage and it is about certainty of timing, not about avoiding risk.
Constant duration versus shortening duration
$$ \text{Bond: } D \to 0 \text{ as } t \to T \qquad \text{Fund: } D \approx \text{constant, by mandate} $$
- A bond's duration shortens every day. A ten-year bond is a five-year bond in five years, and a cash equivalent at the end.
- A fund's duration is roughly constant, because it sells shortening bonds and buys new long ones to stay within its mandate. It never matures because it is not supposed to.
- That is the whole structural difference, and it means the two are not substitutes for a liability-matching job. For a fixed future payment, the bond matches and the fund does not.
- A defined-maturity bond ETF resolves this: a fund that holds bonds of one maturity year and pays out at the end. It is the wrapper for someone who wants both.
The comparison
| Individual bonds | Bond fund | |
|---|---|---|
| Maturity | Fixed date, par returned | None — perpetual |
| Duration over time | Shortens toward zero | Roughly constant |
| Diversification | Needs many holdings and real size | Immediate, hundreds of issuers |
| Minimum size | Often €1,000–100,000 per line | One share |
| Dealing cost | Wide spreads, worse for small lots | Fund spread plus ongoing charge |
| Ongoing cost | None after purchase | 0.05–0.6% typically |
| Reinvestment | Your job, at unknown future rates | Automatic |
| Price visibility | Often stale or absent | Daily, unavoidable |
| Credit work | Yours, per issuer | Delegated, and diversified |
The costs each side understates
- Individual bonds are not free. Retail bond spreads are wide, worse in small sizes, and the cost is embedded in the price rather than billed. A single round trip can exceed a fund's ongoing charge for several years.
- Concentration is the real risk. Ten corporate bonds is not a diversified credit portfolio. The expected-loss arithmetic shows why: one default at 60% loss given default costs six years of the spread the whole portfolio earns.
- Funds carry flow risk. Redemptions can force selling into a weak market, which individual holders do not face. In stressed credit markets this is a genuine and asymmetric disadvantage.
- Reinvestment is a real cost of the bond route — coupons arrive in small amounts that are awkward to reinvest efficiently.
When each one genuinely fits
- Individual government bonds for matching a known future payment, and for large enough sizes that spreads are tolerable. The credit work is trivial and the cash-flow certainty is the point.
- A ladder of individual bonds where a predictable income schedule matters more than efficiency — the ladder planner shows the trade-off between rungs and reinvestment risk.
- Funds for credit, high yield and emerging markets, without exception for most investors. Those are the markets where diversification is not optional and where individual analysis and access are genuinely hard.
- Defined-maturity funds where you want both the maturity date and the diversification.
The questions that settle it
- Am I matching a specific future payment, or seeking exposure to an asset class? The first favours bonds, the second favours funds.
- Can I hold enough lines to be diversified at a size where spreads are reasonable?
- Do I actually never sell, or do I only intend to? The maturity argument requires the first.
- What does the round trip cost on the individual bond, against the fund's charge over my horizon?
- Whose credit work is this, and am I equipped to do it?
Information and education only. This compares two structures in general terms. It is not advice, not a recommendation of either, and nothing here takes account of your circumstances.