Five Checks Before Another Fund Joins the Fold

There is a particular kind of optimism that arrives with a new fund launch. The narrative is crisp, the holdings look modern, and the case for owning it seems obvious. What is less obvious is what has to give in order to make room for it. Most portfolios do not fail because they lacked a novel idea. They fail because nobody can explain, two years later, what the eleventh holding is for.

What follows is a short audit — five questions worth answering in writing before a purchase is placed. None of them requires specialist software. A spreadsheet column and a little honesty will do.

First: what does this fund already hold that you own?

Overlap is the quiet tax on enthusiasm. An investor may believe they hold eight distinct strategies while, in practice, the top ten names of each are near-identical megacaps. The diversification is nominal; the concentration is real.

A useful test is to compare the top ten holdings of the proposed fund with those of each existing holding. Where two funds share more than roughly a third of their weight, they are doing similar work. The question then becomes whether the second is better, cheaper or more suitable — not merely additional. If it is none of those, it is duplication wearing a new jacket.

It is also worth looking at the fund's sector and country split against the whole portfolio rather than against the current holding alone. A global equity fund added to a portfolio already dominated by global equity may look balanced in isolation and lopsided in aggregate.

Second: what is the total cost, not the quoted cost?

The ongoing charges figure is the number most often cited and the least complete. It excludes transaction costs inside the fund, and it certainly excludes what you pay to hold it.

Build a three-layer figure:

• Fund level: ongoing charges, plus a sensible allowance for portfolio turnover.
• Platform level: the percentage or flat fee your provider charges for holding the fund, and whether that fee differs by asset class.
• Dealing level: the cost of buying, and the cost of eventually selling — including any exit charge, stamp duty where relevant (not applicable to funds, but relevant to investment trusts), and the spread on an exchange-traded product.

Express the total as a percentage of the amount you intend to invest, and then as a cash figure over a ten-year holding period. A fund that offers a genuinely differentiated exposure can justify a higher figure. A fund that duplicates existing exposure rarely can.

Third: does it belong in this wrapper at all?

Not every asset suits every account. Within an ISA, the question is largely one of simplicity — you are not gaining a tax advantage by holding one type of asset over another. Within a self-invested personal pension, the same applies, but the timescale is longer and the withdrawals later.

The wrapper question matters more when the fund produces income you intend to reinvest, or when it holds assets that generate withholding tax in jurisdictions where a treaty rate is hard to recover. In those cases, the choice between ISA, SIPP and a general dealing account is not administrative tidiness; it is a small, repeating cost.

There is also a practical constraint: some workplace schemes and platforms restrict the fund list. Adding a holding you cannot top up cheaply, or cannot sell without a fee, is a decision about plumbing as much as about markets.

Fourth: what is it measured against, and does it track?

Every fund needs a yardstick that was chosen before purchase, not after. For an index tracker, that means the stated benchmark and the tracking difference — the gap between the fund's return and the index's, measured over years rather than quarters. A small and consistent shortfall is normal; a widening one is a question for the provider.

For an active fund, the benchmark should be one the manager can plausibly be judged against. Comparing a UK smaller companies fund to the FTSE 100 tells you very little. Write down the benchmark, the fee, and the period over which you will judge the fund. Three years is short; five is beginning to be informative; ten is better.

Fifth: under what circumstances would you sell?

This is the question most often skipped and the one that determines whether the holding becomes an asset or an ornament. A defensible exit plan names at least one of the following: a change in the investment team, a sustained rise in charges, a persistent deviation from the stated strategy, a drift in the fund's role within the portfolio, or a personal change in circumstances.

Without such a trigger, the default becomes inertia, and inertia is how portfolios accumulate holdings nobody can justify. Set a review date in the calendar — annually is sufficient — and note the reason you bought.

The portfolio as a modest collection

None of this argues against ever adding a fund. Portfolios should evolve as goals, tax rules and circumstances change. The argument is narrower: each addition should displace something, or fill a gap that can be named.

A portfolio of six well-understood holdings, each with a stated role, a known cost and a written exit condition, will usually serve a UK investor better than fifteen half-researched ideas bought at moments of enthusiasm. The discipline is not in the buying. It is in the explaining.