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L.8 · BEGINNER · 2 MIN

Rebalancing Rules: Calendar vs Threshold

Over time your winners grow and your laggards shrink, so a 60/40 stock/bond mix quietly drifts -- maybe to 75/25 -- making your portfolio riskier than you chose. Rebalancing means selling a bit of what grew and buying what lagged to return to your target. Two simple rules work: rebalance on a calendar (say once a year) or when an asset drifts past a threshold band (say 5 percentage points off target). Vanguard's research found that checking annually and acting at a ~5% band captures most of the benefit without overtrading.

Quiz · 5 questions ↓
§ 01
RuleHow it worksTradeoff
CalendarRebalance on a fixed date (e.g. once a year)Simple; may act when barely off, or miss a big mid-year swing
Threshold bandRebalance when an asset drifts ~5% past targetResponsive; needs occasional checking
Hybrid (common)Check annually, act only if past the bandLow effort and low overtrading -- best of both
§ 02

WHERE you rebalance matters for taxes. Inside a 401(k) or IRA, selling to rebalance is free -- no tax. In a taxable account, selling winners triggers capital-gains tax, so rebalance there mainly by directing NEW contributions to the laggard rather than selling the winner.

§ 03
Check your current stock/bond split against your target. If it is more than ~5 points off, rebalance -- and in a taxable account, do it by buying the laggard with new cash rather than selling the winner.
§ 04

Rebalancing is a discipline that makes you sell high and buy low automatically -- the opposite of what fear and greed push you toward. It also keeps your risk where you set it, instead of letting a bull market quietly turn you aggressive.

§ 05
Your target is 70% stocks / 30% bonds, but a strong year pushed you to 80/20. What does rebalancing do?
§ 06

Rebalancing is hard because selling winners feels wrong -- the disposition effect (bf-11, Disposition Effect) makes us hold winners too long and dump losers, while splitting money evenly across whatever funds are on offer is the 1/N trap (bf-12, Naive Diversification). Both live in Behavioral Finance.

Five questions · AI feedback

Sit with the ideas.

You hold a 60/40 stock/bond portfolio in a TAXABLE account, and a strong run has drifted it to 70/30. What's the most tax-efficient way to rebalance?

Why:
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