Rules-Based Investing, Explained Without the Jargon

A rules-based strategy decides in advance what will trigger a change in the portfolio, and then follows that decision. The rules are written before the market is stressful, which is precisely the point.

Why written rules help

• They remove the need to make consequential decisions on the worst possible day.
• They are testable — you can examine how the logic behaved across past environments.
• They are auditable, so a client can see exactly why a change happened.

Where they have limits

No rule set anticipates every regime. Backtests flatter themselves, transaction costs and taxes are real, and any strategy will endure stretches where a simple index does better. The honest case for rules is not that they win every year — it is that they keep an investor invested and consistent.

Investing involves risk, including possible loss of principal. Past performance does not guarantee future results.