For education and information only. This page is not personal financial, investment, tax or legal advice, and is not a recommendation or invitation to buy, sell, transfer or hold an investment. Investing involves risk and you can lose money, including the amount invested.
Rebalancing is not a reason to trade for the sake of activity. It is a pre-set response to a portfolio moving away from the risks you intended to own.
Start with a written target
A target can be a percentage split, a maximum position size, a cash buffer or a rule about how much one theme may dominate. Without a target, “rebalancing” often becomes a story told after a price move.
Three sensible triggers to consider
- Calendar: review at a defined interval, without assuming every review requires a trade.
- Threshold: review when an allocation moves far enough from its range.
- Cash-flow: use new contributions or withdrawals to reduce drift before selling assets.
UK considerations
Rebalancing inside an ISA or pension can have different tax consequences from activity outside a wrapper. Costs, spreads and tax can all matter. Check current rules with HMRC or an adviser where relevant. The FCA’s diversification guidance explains why avoiding over-reliance on one investment can help manage risk, but diversification does not prevent loss.
What this framework cannot decide
No article can set your target allocation, risk tolerance or rebalancing frequency. A concentrated investor may deliberately operate with different rules from an index investor. The key is knowing the trade-off and writing the rule before the portfolio tests it.
What rebalancing cannot do
Rebalancing can change risk exposure but does not prevent losses or guarantee returns. It may create costs and tax outside tax wrappers. It cannot determine whether a target allocation suits you, whether an asset will recover or whether a transaction is appropriate for your circumstances. Use it as a documented process, not a substitute for judgement.