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The boring discipline that quietly does most of the work over decades. A visual, step-by-step walk through why drift happens and three honest ways to fix it.
Step 1
You start with 60% stocks and 40% bonds. After a strong year for equities, your portfolio drifts to 70/30 — not because you bought more stocks, but because the ones you owned grew faster than the bonds.
The number you chose was 60/40. The number you now own is 70/30. You never decided to take more risk; the market did it for you.
A 60/40 mix drifts after a strong year for stocks
Step 2
Drift sounds harmless until the next downturn. A 70/30 portfolio falls much harder in a stock-market crash than the 60/40 you chose. The extra risk was invisible until the bad year arrived.
Most people who quit during a crash didn't hate stocks — they had drifted into a riskier mix than they realized they owned.
Step 3
On a fixed date — quarterly, every six months, or annually — you check your portfolio against your target mix and adjust back. The rule is the date, not the news.
Pros: dead simple, easy to actually do, removes emotion. Cons: can leave you mis-allocated for a few months between checks. Quarterly or yearly is plenty for most long-term portfolios.
Quarterly check-in
Rule fires on the date — not on the news.
Step 4
You set a tolerance — say, "if any position drifts more than 5 percentage points from its target, rebalance it." When the gap opens that wide, you fix it. When the gap stays small, you do nothing.
Responds to actual drift, not arbitrary dates. Sells the winners when they really have run up.
Step 5
If you're still adding money every month or quarter, you don't have to sell anything to rebalance. You just direct the new contributions toward whatever's underweight.
No taxes (you're buying, not selling), no transaction costs in many cases, and you're always buying the laggards — which feels uncomfortable but is the right habit.
New money flows into the underweight side
No sale, no taxes — just direct the next deposit.
Step 6
Rebalancing monthly costs more in taxes and fees than it earns back. Rebalancing on a panic feels right but locks in losses. And changing your target mix because you have a new view on a sector isn't rebalancing — it's stock-picking with a rebalancing label on it.
Pick a method. Write the rule down. Then do nothing between rebalances. The whole point is to take the daily decision out of your hands.
The traps that quietly cost you
Rebalance too often
Taxes + fees eat the benefit
Rebalance on emotion
Selling in a crash is the same trap
Confuse it with stock-picking
Rebalancing returns the mix; it's not changing the mix
Educational information only. Not investment advice. We don't know your target allocation, tax situation, or time horizon.