How to Rebalance Your Portfolio

Rebalancing is the once-a-year chore that keeps your investment portfolio on track. You compare your current asset allocation (the mix of stocks, bonds, international, etc.) to your target. If anything is more than 5 percentage points off, you nudge it back. Done in 30 minutes, ideally on the same date every year, and ideally inside tax-advantaged accounts to avoid taxes.

Most investors either rebalance too much (paying unnecessary taxes and fees) or not at all (letting their portfolio quietly become much riskier than they intended). This guide covers the right cadence, the right method, and the right place to do it.

What Rebalancing Actually Means

Your portfolio has a target asset allocation, such as 70% stocks, 30% bonds. Over time, the asset classes grow at different rates. After a strong stock year, the stock portion grows larger. After a year or two of growth, your portfolio might drift to 80% stocks, 20% bonds, which is meaningfully riskier than your original plan.

Rebalancing is the act of returning to your target by selling some of the overweight asset and buying some of the underweight, or by directing new contributions toward the underweight.

The benefit is risk management, not return enhancement. Vanguard, BlackRock, and academic studies have found that rebalancing produces a roughly flat to slightly positive effect on long-run returns, but a significant reduction in risk. Without rebalancing, your portfolio drifts toward whatever asset class has been winning, exposing you to a larger fall when it eventually corrects.

Step 1: Have a Written Target Allocation

You cannot rebalance to "I dunno." Write down your target.

A few common target allocations by life stage:

| Stage | Stocks | Bonds | Cash | |-------|--------|-------|------| | 20s and 30s, retirement saving | 90% to 100% | 0% to 10% | 0% | | 40s, retirement saving | 80% to 90% | 10% to 20% | 0% | | 50s, retirement saving | 70% to 80% | 20% to 30% | 0% | | 60s, near retirement | 50% to 70% | 30% to 50% | 0% to 5% | | In retirement | 40% to 60% | 30% to 50% | 5% to 10% | | Down payment in 3 to 5 years | 20% to 40% | 40% to 60% | 10% to 30% |

Within the stock allocation, a typical breakdown is:

• 70% to 80% US stocks
• 20% to 30% international stocks

Within the bond allocation, a typical breakdown is:

• 70% to 100% US investment-grade bonds
• 0% to 30% international or inflation-protected bonds (TIPS)

If you want one decision instead of three or four, a target-date index fund (VFIFX for 2050, VLXVX for 2065) handles the allocation and the rebalancing automatically. The slight cost (0.08% vs 0.04% expense ratio) is worth it for many investors. See how to invest in index funds for the broader playbook.

Step 2: Add Up Your Actual Allocation Across All Accounts

The most common rebalancing mistake is calculating allocation one account at a time instead of across the whole portfolio. Your 401(k), Roth IRA, and taxable brokerage are not separate strategies. They are one portfolio split across three tax wrappers.

The procedure:

1. List every investment account with its current balance.
2. For each account, write down the percentage in each asset class (stocks, bonds, cash).
3. Calculate the dollar amount in each asset class per account.
4. Sum the dollar amounts across all accounts by asset class.
5. Divide by total portfolio value to get your overall percentages.

A worked example with a $200,000 portfolio:

| Account | Balance | US Stock | Int'l Stock | Bonds | |---------|---------|----------|-------------|-------| | 401(k) | $120,000 | $90,000 (75%) | $20,000 (17%) | $10,000 (8%) | | Roth IRA | $50,000 | $40,000 (80%) | $10,000 (20%) | $0 | | Taxable | $30,000 | $30,000 (100%) | $0 | $0 | | Totals | $200,000 | $160,000 (80%) | $30,000 (15%) | $10,000 (5%) |

If the target allocation is 60% US stock, 20% international, 20% bonds, this portfolio is dramatically overweight US stocks and underweight bonds. Time to rebalance.

For tracking total portfolio value across accounts, use the net worth calculator.

Step 3: Apply the 5% Rule

Not every drift requires action. Rebalancing on small drifts adds work, transaction friction, and potentially taxes for no real benefit.

The 5% rule: rebalance only when an asset class is 5+ percentage points from its target.

| Target | No Action Range | Rebalance Trigger | |--------|-----------------|-------------------| | 60% | 55% to 65% | Below 55% or above 65% | | 30% | 25% to 35% | Below 25% or above 35% | | 10% | 5% to 15% | Below 5% or above 15% |

A stricter version (used by some institutional investors) is the 25% rule: rebalance when an asset class is more than 25% of its own target. For a 20% target, the trigger band is 15% to 25%. The 5% rule and the 25% rule produce similar results for most portfolios.

If everything is within the no-action range, skip rebalancing this year. Update your spreadsheet, set a calendar reminder for next year, and move on.

Step 4: Rebalance With New Contributions First

The cleanest rebalancing method is to redirect new contributions, not to sell existing holdings.

If you contribute $1,500 a month and your portfolio is underweight bonds, send 100% of the next few months' contributions to bonds until the allocation is back on target. This works perfectly in a taxable account because there is no sale and no taxable event.

When new contributions alone are not enough (in a portfolio that is now large relative to the contribution rate), you have to do an actual rebalance trade.

Step 5: Sell Inside Tax-Advantaged Accounts First

The order of operations for actual rebalancing trades:

1. Inside 401(k), IRA, HSA: Sell the overweight asset, buy the underweight. No tax impact at all.
2. Inside taxable brokerage: Sell only if absolutely necessary. Consider the tax cost of any sale.
3. In taxable, use tax-loss harvesting to offset rebalancing gains. Sell a losing position at the same time to create offsetting capital losses.
4. Hold appreciated taxable positions for the long term and rebalance only in the tax-advantaged accounts.

A practical pattern: most of your stock exposure ends up in your taxable brokerage (where you have the most flexibility), and most of your bond exposure ends up in your 401(k) or IRA (where bond income is tax-sheltered). When you need to rebalance, you adjust the bond allocation inside the IRA without touching the taxable positions.

The IRS publishes guidance on capital gains rates at IRS.gov. Short-term gains (held under a year) are taxed at ordinary income rates, which can be 22% to 37%. Long-term gains (held over a year) are 0%, 15%, or 20% depending on income.

Step 6: Pick a Date and Stick to It

Once a year is enough for most portfolios. Quarterly is fine if you enjoy it but produces nearly identical results with more work. Monthly is too much for almost everyone.

A few good options:

• Your birthday. Easy to remember, naturally annual.
• January 1 or the first Monday of January. Easy to track with prior-year tax documents.
• April 15. Aligned with tax season when you are already looking at financial documents.
• The day after your year-end bonus arrives, if you receive one.

Set a recurring calendar event. Set a backup reminder a week before. The most expensive rebalancing mistake is forgetting to do it for five years.

Common Rebalancing Mistakes

A short list of expensive errors:

• Selling appreciated stocks in a taxable account when you could rebalance in your IRA. Pays unnecessary capital gains tax.
• Rebalancing on every 1% drift. Generates fees and tax events without improving returns.
• Stopping rebalancing during bull markets. Lets your stock allocation drift dangerously high right before a correction.
• Stopping rebalancing during bear markets. Lets your stock allocation drift below target right before a recovery.
• Forgetting to rebalance after a major life change. A new mortgage, a baby, an inheritance, or approaching retirement should trigger a target update and a rebalance.
• Tax-loss harvesting and immediately repurchasing the same security. The IRS wash-sale rule disallows the loss if you buy the same or "substantially identical" security within 30 days. Wait 31+ days, or buy a similar-but-different fund (VTI instead of ITOT).

For broader context on portfolio management, the SEC investor.gov site and FINRA both publish accessible guides. Brokerage protection up to $500,000 is provided by SIPC. Retirement contribution and income thresholds are set by the IRS each year.

Use the compound interest calculator to model how your portfolio grows over a 20-year window. Track total net worth annually with the net worth calculator. Set savings targets with the savings goal calculator.

The One-Hour Annual Rebalancing Routine

A complete annual checkup:

1. List all investment accounts and balances (15 minutes).
2. Calculate current allocation across the full portfolio (10 minutes).
3. Compare to written target. Apply 5% rule (5 minutes).
4. Decide on contribution redirects and/or rebalancing trades (10 minutes).
5. Place the trades inside tax-advantaged accounts (10 minutes).
6. Update the target if a life change warrants it (10 minutes).

Done. The single hour you spend each year on rebalancing is one of the highest-return uses of an hour you will ever have. It does not predict markets. It does not pick winning stocks. It just keeps your portfolio aligned with the risk you actually want to take, which is the entire point.

See sibling articles in the investing hub for more, including how to invest in stocks for beginners and how to choose a mutual fund.