---
title: Rebalancing — what it means and why it matters | Allocate AI
description: Periodically buying and selling to bring your portfolio back to its intended mix after market moves have pushed it off target.
canonical: https://allocateai.io/glossary/rebalancing
site: Allocate AI — https://allocateai.io
---

# Rebalancing

Periodically buying and selling to bring your portfolio back to its intended mix after market moves have pushed it off target.

Rebalancing is maintenance for an asset allocation. Markets move unevenly, so a portfolio set at 70% stocks and 30% bonds drifts. After a strong year for stocks it might sit at 76/24; after a bad one, 64/36. Rebalancing sells some of whatever grew and buys whatever lagged, restoring the original mix.

The effect is to force the discipline that is hardest to keep by hand: selling high and buying low. It also keeps risk where you set it. A portfolio that has drifted to 85% stocks will fall much harder in a downturn than the 70% portfolio you planned for.

Example: a $200,000 portfolio at 70/30 grows to $240,000 after stocks rise 25% and bonds rise 2%. It is now $175,000 stocks and $61,200 bonds, about 74/26. Rebalancing to 70/30 means selling about $9,800 of stocks and buying that much in bonds.

How often is a matter of preference. Once a year is common. Another approach is to rebalance only when an asset drifts more than five percentage points from target. In taxable accounts, selling triggers capital gains, so many people rebalance with new contributions instead, directing fresh money toward whatever is underweight. Inside a 401(k) or IRA there is no tax cost.

The common mistake is rebalancing too often, which racks up transactions and taxes for little benefit, or never rebalancing at all, which is how a moderate portfolio quietly becomes an aggressive one.

## Related terms

- [Asset allocation](https://allocateai.io/glossary/asset-allocation) — How your investments are split between stocks, bonds, and cash; the mix drives most of your long-term return and how bumpy the ride is.
- [Diversification](https://allocateai.io/glossary/diversification) — Spreading money across many investments so that no single company, industry, or country can sink your whole plan.
- [Capital gains (short-term vs long-term)](https://allocateai.io/glossary/capital-gains) — Profit from selling an investment for more than you paid; gains on assets held over a year get lower tax rates than gains on assets sold sooner.
- [Index fund](https://allocateai.io/glossary/index-fund) — A mutual fund or ETF that holds every stock in a market index like the S&P 500, so you own a slice of the whole market at very low cost.

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Allocate AI is a budgeting and financial-planning app: link your accounts, say what you want in plain words, and it writes the plan and stages every change for your approval. Read more at https://allocateai.io or see all pages in https://allocateai.io/llms.txt.