Every 3 to 6 months, with asymmetric thresholds
Every 3 or 6 months, if equities have risen a lot, sell some of them and bring the cash back to its target level. If they've fallen, buy more of the World ETF with the available cash. Set thresholds — ideally asymmetric — to decide the percentage below which you buy more equities (typically target −5%, to lower your average purchase price) and the percentage above which you sell (typically target +10%, to take advantage of market rallies).
Why it works
Rebalancing helps you follow a simple rule: periodically bring the portfolio back to its intended composition, without being guided by the emotions of the moment. In practice, this means buying more of whatever weighs less than intended and trimming whatever has grown beyond target. It isn't about predicting the market — it's about keeping risk under control over time.
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