The Problem With Deciding in a Crisis
The fundamental challenge of long-run investing is that the decisions which matter most — whether to stay in the market during a crash, whether to rebalance toward equities when they have fallen 40%, whether to sell or hold when every instinct screams danger — must be made under the most emotionally difficult conditions. A brain flooded with cortisol in a falling market is not well-suited to cool rational calculation. The investor who has not thought through these decisions in advance will make them in real time, under pressure, and almost certainly make them badly.
The Investor Policy Statement (IPS) is the solution: a written document prepared in calm conditions that answers the key questions before they become urgent.
What an IPS Contains
A well-constructed IPS addresses six areas. First, investment objectives: what is the money for, and what does success look like? Retirement income, a house deposit, education funding — the objective determines the appropriate strategy. Second, time horizon: how long before this money is needed? A 30-year horizon changes the calculus of risk entirely. Third, risk tolerance: how much can this portfolio fall before it would be genuinely damaging — financially or behaviourally? Including a maximum acceptable drawdown figure is important. Fourth, target asset allocation: the intended split between equities, bonds, and other assets. Fifth, rebalancing rules: when and how will the portfolio be rebalanced to the target allocation? Specifying thresholds (e.g., "rebalance when any asset class drifts more than 5 percentage points from target") removes ambiguity. Sixth — and most importantly — a bear market protocol: a pre-written statement of what the investor will do if markets fall 20%, 30%, or 40%.
The IPS as a Commitment Device
The IPS functions as a contract with your future self. By writing down "if global equities fall 30%, I will rebalance my portfolio to restore my target allocation" during a period of calm, the investor has pre-committed to a course of action. When the 30% fall arrives and panic is widespread, the decision has already been made. The investor does not need to reason through it under stress; they need only follow the plan.
This is standard practice in institutional investment management. Every pension fund, endowment, and sovereign wealth fund operates under a formal investment policy statement. The idea that retail investors — who have far less experience and more emotional exposure — can invest successfully without one is puzzling.
The Enemy of a Good Plan
Carl Richards coined the phrase "the enemy of a good plan is the dream of a perfect plan." An IPS does not need to be perfect. It needs to exist, to be written down, and to be followed. A clear written commitment to a reasonable strategy will consistently outperform an improvised response to market conditions, regardless of how sophisticated the improvisation.