For most Australian investors, the bulk of their equity wealth sits in a remarkably small number of companies. The 20 largest names account for almost 65% of the market by value, and through a combination of size, index construction and long-held positions, often carrying embedded capital gains, that is where client portfolios are most heavily concentrated. The uncomfortable question for advisers and clients heading into the new financial year is whether that is also where future returns are likely to be lowest.

A look-through of the market on the same building-block basis we use at the asset-allocation level, current yield, the cash flows companies retain and reinvest, expected growth, and whether multiples are cheap or expensive against their own history, suggests it might be. Segment the market by size and the pattern is orderly but striking: the top 20 offer a forward expected return of under 5% a year, the next 80 around 7%, and smaller companies high single digits. That is directionally what you would expect over the long run in theory but the divergence is higher than it has been in the past and it is the opposite of where the weight of money has gone. Note that these return estimates are merely a mechanical outcome of current yields, broker consensus, future growth and reversion to mean valuation multiples and not a guarantee of future outcomes.

The story sharpens inside the index. Financials now make up close to half the ASX 20, and on this framework they generate a long-term expected return of only about 2% a year . Even without assuming any reversion in today's stretched multiples for the largest companies the current yield and expected growth offer fairly meagre rewards. By contrast, the quality-growth names, in the top 20 that are essentially CSL and Aristocrat, less than a tenth of the index,carry the highest expected returns of any segment. The pocket is simply too small to move the dial at the large-cap end.

Move down the size spectrum and that pocket gets both bigger and more interesting. Among the next 80 and smaller companies, quality-growth businesses are increasingly pairing yields of 5–6% with genuine earnings growth and, after a punishing period for mid-caps, some valuation support. On conservative assumptions, consensus growth, no help from commodity prices, and expensive multiples assumed to compress rather than expand,those pockets screen at around 14% and 15% a year respectively. Sustained over a decade, that would be a materially different outcome.

None of this is a claim that smaller companies are a defensive safe haven; they are not, and they will probably be more volatile. It is a statement about long-term expected returns, and about a disconnect worth noting. Where most of the money sits is probably not where the CPI-plus objective gets met but maybe you can get more buck for a similar amount of bang by moving down the market cap spectrum at least.

For advisers, that reframes several conversations: reviewing whether legacy large-cap holdings still earn their place, weighing rebalancing against tax position and the scope to harvest losses, and tying any shift back to long-term savings goals rather than recent performance. The neglected corners of the market in Australia, much as in emerging markets, may simply be where the more prospective returns now live; it's just a question of when the tide turns.