How to Rebalance Your Portfolio: When, How Often & 3 Methods Compared
July 18, 2026 · 12 min read
A 60/40 portfolio left alone for 5 years in a bull market might look like 75/25 — exposing you to far more risk than you intended. Rebalancing is the discipline that keeps your portfolio aligned with your actual risk tolerance and goals.
Key Rebalancing Facts
Annual
Target frequency
Optimal after costs for most investors
5% drift
Threshold method
Trigger if any asset class drifts 5%+ off
0–1%
Tax cost of rebal.
In taxable accounts; 0% in tax-advantaged
20–30%
Risk reduction
Reduces portfolio volatility vs. no rebal.
IRA/401k
Best account to rebal.
Tax-free; no capital gains on trades
Neutral
Return impact
Small drag vs. letting winners run long-term
Why Portfolios Drift — And Why It Matters
When you first build a portfolio with a target allocation — say 70% equities, 20% bonds, 10% international — that allocation reflects your risk tolerance and investment horizon at that moment. But markets don't stay static. If US equities return 30% in a year while bonds return 3%, your equity allocation grows to 75–80% without you lifting a finger.
This drift creates two problems:
Risk Creep
Your actual portfolio becomes riskier than your target. In a bear market, you lose more than you expected — which often triggers panic selling at the worst time, crystallizing losses that could have been avoided by maintaining your intended risk level.
Concentration Risk
Extended bull runs in specific sectors (AI/tech in 2023–2026) can leave you heavily overweight one risk factor. If that sector corrects, the damage to your total portfolio is much larger than your original allocation would have tolerated.
A Real-World Drift Example
An investor in January 2023 with a 60% US equity / 30% bonds / 10% international allocation — left completely untouched — would have entered July 2026 at approximately 79% US equity / 16% bonds / 5% international. That's 19 percentage points above target equity exposure — the equivalent of a moderate investor accidentally becoming an aggressive investor.
Good rebalancing starts with a well-constructed initial allocation. If you're still defining your target weights, see our guide to portfolio diversification for sector allocation frameworks and common mistakes to avoid before setting your rebalancing targets.
3 Rebalancing Methods Compared
Calendar Rebalancing
How it works: Rebalance on a fixed schedule — annual, semi-annual, or quarterly — regardless of how much the portfolio has drifted.
Pros
Simple and predictable
No monitoring required between dates
Annual rebalancing is tax-efficient (fewer trades)
Easy to automate
Cons
May rebalance when drift is minimal (wasted cost)
May miss significant drift between rebalancing dates
Best for: Recommended for: Individual investors, 401(k)/IRA holders, simple 2–4 fund portfolios
Threshold (Band) Rebalancing
How it works: Rebalance only when an asset class drifts beyond a set band — typically ±5% from its target. If equity target is 60%, rebalance only when it hits 55% or 65%.
Pros
Only trades when meaningful drift occurs
Can capture slightly better returns by letting winners run
Fewer unnecessary trades in stable markets
Cons
Requires regular monitoring
More complex to implement manually
Can trigger many small rebalances in volatile markets
Best for: Recommended for: Investors with $500K+ or those using tools like Empower/Betterment/Wealthfront
Combination Method
How it works: Check the portfolio on a fixed schedule (e.g., quarterly), but only rebalance if drift exceeds a threshold (e.g., 5%). Also rebalance any time a trigger event occurs (major market move, contribution, withdrawal).
Pros
Best of both methods
Balances simplicity with responsiveness
Industry standard for financial advisors
Cons
More complex than calendar-only
Still requires periodic monitoring
Best for: Recommended for: Active self-directed investors and financial advisors; the most widely used professional approach
Tax-Efficient Rebalancing — How to Minimize the Tax Bill
In taxable accounts, selling appreciated assets to rebalance triggers capital gains tax. These strategies reduce that cost:
Rebalance in tax-advantaged accounts first
Your IRA, 401(k), and HSA are the best places to rebalance — there's no capital gains tax on trades inside these accounts. If your allocation is off, adjust inside tax-advantaged accounts before touching your taxable brokerage.
Use new contributions to rebalance
Instead of selling overweight assets, direct new contributions (paycheck deferrals, additional investments) into underweight asset classes. This achieves the same allocation target without triggering any taxable event.
Redirect dividends to underweight assets
If your brokerage or 401(k) offers it, redirect dividend reinvestment from overweight funds to underweight funds. This gradual rebalancing has zero transaction cost and zero tax impact.
Harvest losses while rebalancing
If you're selling an overweight position at a loss, you get the benefit of rebalancing AND a tax deduction. Coordinate rebalancing with tax-loss harvesting during market corrections for maximum efficiency. See our full tax-loss harvesting guide for swap pair strategies.
Wait for long-term treatment when possible
If an overweight position is close to its 1-year anniversary, waiting a few weeks to sell converts a short-term gain (up to 37% tax) into a long-term gain (0–20% tax). Often worth the temporary allocation drift.
For a complete guide to minimizing your tax bill through strategic loss realization, see our tax-loss harvesting guide. Combining rebalancing with harvesting in November–December is one of the most tax-efficient strategies available to taxable investors.
Step-by-Step: How to Rebalance Your Portfolio
1
Document your target allocation
Write down your intended allocation: e.g., 60% US equity, 20% bonds, 10% international, 5% REITs, 5% cash. If you don't have a written target, you can't know when you've drifted.
2
Calculate current allocation across ALL accounts
Add up the market value of every holding across your 401(k), IRA, taxable brokerage, and any other investment accounts. Calculate each asset class as a percentage of total portfolio value.
3
Identify the gaps
Compare current allocation to target. Flag any asset class that is 5%+ above or below target. These are your rebalancing candidates. A small spreadsheet or tool like Empower Personal Dashboard makes this trivial.
4
Plan the trades — tax accounts first
List the trades needed: 'Sell $15,000 of US equity ETF in IRA, buy $10,000 of bond ETF and $5,000 international ETF.' Prioritize trades inside tax-advantaged accounts. Check if new contributions can cover any gaps before selling.
5
Execute in the right order
Execute sells first, then buys, to ensure you have proceeds available. In 401(k)s, use allocation change tools. In IRAs and taxable accounts, place trades through your brokerage. Confirm lot selection (use specific identification to minimize gains).
6
Set your next review date
Calendar the next rebalancing check. Annual reviewers: set a recurring January or December 31st calendar event. Threshold users: set a quarterly reminder to check drift. Write it down — 'set and forget' leads to severe drift over time.
Bottom Line
Portfolio rebalancing is the unsexy, unglamorous discipline that separates investors who maintain their risk management through a full market cycle from those who discover their portfolio is far too aggressive only when it's too late. It doesn't require market timing, stock picking, or any particular sophistication — just the discipline to review your allocation annually and correct drift when it appears.
For most individual investors, the optimal approach is annual calendar rebalancing with a 5% threshold trigger — check once a year, rebalance if anything is more than 5% off target, and otherwise stay the course. Prioritize rebalancing in tax-advantaged accounts, use new contributions to top up underweight positions, and coordinate with tax-loss harvesting when opportunities arise.
The goal isn't to maximize returns through rebalancing — it's to control risk. A portfolio that drifts too aggressive will eventually experience a drawdown larger than you planned for, which is the most common reason investors make their worst decisions at the worst times. Rebalancing prevents that scenario before it happens.