
How Often Should You Rebalance a Long-Term Portfolio?
The evidence says the calendar matters far less than most investors assume — what matters is having a rule and following it without emotion.
Portfolios addresses the whole rather than the parts: hidden overlap between funds, how many positions add genuine diversification, geographic concentration, and a rebalancing schedule realistic for somebody with a full-time job. Suited to investors owning several holdings who suspect they are less diversified than they look.
Building a coherent set of positions: fund overlap, correlation, position count, home bias, and a rebalancing schedule that survives a busy year.

The evidence says the calendar matters far less than most investors assume — what matters is having a rule and following it without emotion.

SIPC replaces missing cash and securities up to set limits when a member brokerage collapses, but it never insures against a market decline.

Rebalancing does not chase higher returns. It resets a portfolio to the risk level an investor originally chose, and the evidence shows most of its benefit…

The same three-fund portfolio can lose a fraction of a percent a year to taxes purely by sitting in the wrong accounts — placement is the quiet optimization.

A position worth 20% of your portfolio can halve your retirement date — the arithmetic of concentration, from Enron's employees to today's RSU holders.