Common options are quarterly, semi-annually, or annually. Some portfolios use thresholds
(e.g., rebalance when an asset drifts beyond a set range). The best method is the one you can
follow consistently.
Rebalancing is the process of returning a portfolio to its target allocation after markets move. Because asset prices rarely grow at the same pace, portfolio weights drift over time - often increasing exposure to whichever asset has recently outperformed.
In retirement planning, rebalancing is not about predicting what will happen next. It is a discipline tool: it helps keep risk levels consistent, maintains diversification, and reduces the chance of accidental overexposure to a single market, sector, or theme.
During the accumulation phase, allocation drift can quietly increase volatility. In the years approaching retirement, that drift becomes more dangerous because a large drawdown can coincide with the beginning of withdrawals.
A structured rebalancing approach helps preserve the intended risk profile, which is especially important when the portfolio must support future income and stability.
Most retirement-focused portfolios use one of two approaches, or a combination: a scheduled review (e.g., quarterly or annually) and a threshold-based trigger when allocation drifts beyond a defined range.
The goal is to act consistently. Rules reduce emotional decisions, such as chasing performance after strong rallies or selling growth assets after declines.
Once withdrawals begin, rebalancing can also guide where cash is taken from. Instead of selling assets randomly, withdrawals can be funded from positions that are above target, bringing the portfolio back toward its intended allocation.
This improves long-term consistency and reduces the chance of selling growth assets at depressed prices during down markets.