How is "suitable" a lower bar than "best interest"?
Educational content, not legal or compliance advice. Which standard applies to whom is set by local rules and differs widely — several jurisdictions have moved suitability toward a best-interest test, some ban certain commissions outright, others still permit them with disclosure. Verify the regime that governs you.
Two standards, one recommendation, very different questions.
- Suitability asks: is this appropriate for this client, given what I know about them? It is a floor. Many things clear it.
- Best interest (the fiduciary framing) asks: is this what I would choose for them, with my own interest set aside? It is a ceiling. Usually one thing clears it.
The gap between floor and ceiling is not a technicality. It is precisely the space in which conflicts of interest live comfortably, because everything inside it is defensible.
The share-class case
The same fund, two share classes.
- Class A: ongoing charge 1.60%, of which 0.75% is paid to the distributor as a trail commission.
- Class I: ongoing charge 0.85%, no trail.
Identical portfolio, identical manager, identical strategy. The client is a long-term investor with the right risk profile for the fund.
Both classes are suitable. Nothing about Class A is inappropriate for this client — it is the right strategy, the right risk, the right horizon. A suitability test, honestly applied, passes it.
Where both classes are genuinely available to this client, only Class I survives a best-interest test. Once you ask "which of these would I choose with my own revenue set aside?", the answer is not close. Availability is the whole of the caveat — a platform that does not offer Class I, or a minimum the client cannot meet, is a fact that changes the comparison rather than an excuse that ends it, and it belongs in the file either way.
What does the difference cost? On €200,000 over 20 years, assuming 6% before the extra charge:
- Class I: about €641,000.
- Class A: about €556,000.
About €85,000 — more than 40% of the original investment. Split it honestly: roughly €51,000 is the extra charge itself, handed over to the distribution chain year by year on a growing balance; the other €34,000 is the growth the client never earned on money that had already left. In year one it looked like €1,500. Compounding does the rest, quietly, for two decades.
Why "suitable but not best" is where complaints come from
A firm operating honestly under a suitability standard can produce this outcome without a single dishonest act. Every recommendation matched a client. Every form was completed. Every box was ticked. The damage was done by the set of options that were on the table, and suitability says nothing about that set.
This is the practical lesson: a standard shapes conduct through what it fails to ask. Suitability never asks "compared to what?" Best interest asks nothing else.
The reasoning made explicit
When you face a recommendation, run three questions in order:
- Does it fit the client? (Suitability — necessary, never sufficient.)
- Compared with what? Name the realistic alternatives, including the cheaper and duller ones, and record why this one wins for the client.
- Would my answer change if my compensation were identical across all options? If yes, you have found the real driver, and it is not the client's interest.
Question three is the whole unit compressed into a sentence. It is uncomfortable by design, and it is worth asking out loud.
Try it now
- Answer question two with a number. Take one fund you actually own and one with the same mandate, and read the expense ratio of each. Is the duller one cheaper, and would you have known to ask? What a fund's data page will not tell you is whether a cheaper share class of the same fund exists; that part is still the provider's document, and noticing which half of the question the data can answer is itself the lesson. Two funds are below; for a fund you own, open it in the Terminal (the link starts on SPY; change the symbol) and read the same line there.
Open SPY.US — fundamentals in the EODHD Terminal
- Reason through the case: name three facts that would make Class A genuinely defensible for a particular client (they exist — for example, no access to Class I at that platform, or a minimum you cannot meet). Notice how specific they have to be.
- Apply question three to a decision you have made on someone else's behalf. Be honest about the answer; nobody is reading it.