Investing term
What is Rebalancing?
Periodically bringing your allocation back to target as market moves push it off.
Rebalancing is the periodic act of bringing your allocation back to target after market moves have pushed it off. When stocks surge and swell past their target weight, rebalancing trims them back and tops up the laggards, restoring the mix you originally chose.
It does two jobs at once. It controls risk, stopping winners from quietly coming to dominate and dragging your portfolio to a riskier place than you intended. And it imposes a disciplined sell-high, buy-low reflex — you're trimming what's expensive and adding to what's cheap. The method can be calendar-based, threshold-based, or done with new contributions; what matters is having a rule and following it rather than drifting forever.
Rebalancing pulls a drifted mix back to target — trimming what's grown, adding to what's lagged. It controls risk and quietly enforces selling high and buying low.
For example
Once a year you check your mix and trim whatever's overgrown back to plan — rebalancing keeping your risk from creeping up unnoticed.
Learn it by doing
That's Rebalancing in theory — it clicks when you use it. Practise it hands-on in a free, interactive lesson (Stage 3, Know Yourself: Risk Tolerance & Time Horizons).
Try the free lesson →Why it matters to you
Rebalancing matters because it's the mechanical fix for allocation drift — the discipline that keeps your actual risk matched to your intended risk over decades. It also quietly enforces buying low and selling high, the opposite of the emotional trades most investors make. Crucially, it removes judgement from the moment: a pre-set rule tells you to trim after a rally and buy after a crash, exactly when your instincts would scream the opposite.
⚠ Rebalancing too often — or never
Two errors bracket rebalancing. Doing it constantly racks up costs and taxes for little benefit, while never doing it lets risk drift unchecked for years. A simple rule — once a year, or when an asset drifts a set amount from target — captures nearly all the benefit without the churn. The rule matters more than the exact frequency.