Investors and advisers often spend a disproportionate amount of time debating which fund manager to select, or whether now is the right moment to increase or reduce equity exposure. Yet decades of rigorous academic research points to a simple and perhaps uncomfortable truth: the single most important decision in portfolio construction is not who manages your assets or when you invest — it is how your capital is distributed across asset classes.
This is the principle of Strategic Asset Allocation (SAA), and it is the cornerstone of everything we do at Bellmont.
What the Research Tells Us
The seminal work of Brinson, Hood and Beebower, published in 1986 and updated in subsequent studies, demonstrated that asset allocation policy explains approximately 91% of the variability in a portfolio's returns over time. The remaining 9% is attributable to dynamic allocation shifts, security selection, and other active decisions combined.
Put simply: the decision to hold 40% in Australian equities, 20% in global equities, 20% in fixed income, and 20% in alternatives will drive your portfolio's long-term trajectory far more powerfully than whether you choose Manager A over Manager B within any of those buckets.
This does not mean that manager selection is irrelevant — it remains important, particularly in less efficient asset classes where skilled managers can add genuine value. But it does mean that the effort and rigour applied to building the strategic foundation of a portfolio should be commensurate with its explanatory power.
The Practical Implications for Advice Practices
For financial advisers running managed account portfolios, this insight has several practical implications.
First, benchmark selection matters enormously. The benchmark embedded within a portfolio's SAA defines the risk-return profile your clients will experience over the long term. Selecting benchmarks with granular precision — distinguishing between Australian equities and global equities, between investment-grade fixed income and high yield, between listed and unlisted assets — ensures you have a clear, defensible rationale for every structural bet in the portfolio.
Second, SAA should be stable. The temptation to make frequent tactical shifts in response to short-term market noise can undermine the very engine that drives long-term returns. Our approach at Bellmont is to maintain discipline around the strategic allocation, making meaningful adjustments only when markets reach historical extremes — typically when valuations diverge more than two standard deviations from their long-run mean. At these junctures, the probability of mean reversion is sufficiently high to justify a targeted, evidence-based tilt.
Third, the SAA should reflect the philosophy of the advice practice, not a standardised template. An advice firm serving primarily pre-retirees with significant income needs will require a fundamentally different allocation framework than one serving younger wealth accumulators. The SAA is not a product to be selected off a shelf; it is a bespoke expression of your clients' objectives and your firm's investment philosophy.
Why Bellmont Starts Here
When we engage a new advice partner, our process begins not with a discussion of managers or products, but with a deep exploration of the firm's investment beliefs and client base. We work collaboratively to construct an SAA that is precisely calibrated to your philosophy — active or passive, growth-oriented or income-focused, domestically concentrated or globally diversified.
Only once this foundation is in place do we turn to the questions of manager selection and portfolio construction. In this way, every decision made downstream is anchored to a clear, well-reasoned strategic framework — one that your clients can understand and that you can defend with confidence.
Getting the SAA right is not glamorous. It does not generate headlines or generate talking points for client newsletters. But done well, it is the single greatest lever available to improve long-term client outcomes.
That is why it is where we always start.