How often should I rebalance my portfolio?

Check quarterly, rebalance when any asset class drifts 5% or more from your target allocation. Most investors rebalance 1-2 times per year.

Does frequent rebalancing hurt returns?

Yes. Over-rebalancing can reduce returns by selling winners too early. Annual or threshold-based rebalancing outperforms monthly rebalancing in most studies.

Should I rebalance in a down market?

Yes—this is actually the best time. Rebalancing in a down market means buying assets at lower prices, which improves long-term returns.

How Often Should You Rebalance Your Portfolio?

⚖️ Should I Rebalance Now?

Compare your current allocation to your target:

Target Allocation

Stocks %

Bonds %

Current Allocation

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Stocks %

Bonds %

Short answer: Check quarterly. Rebalance when any asset class drifts 5% or more from your target.

Most people over-think this. Let me make it simple.

The Simple Rule

Pick a target allocation (e.g., 70% stocks / 30% bonds)
Check quarterly (set a calendar reminder)
Rebalance if drift > 5% (if stocks are at 76%+, rebalance)

That’s it. Once or twice a year for most portfolios.

Why Not Rebalance Monthly?

Because it hurts returns.

Vanguard studied this. Their findings:

Monthly rebalancing underperforms annual rebalancing
Threshold-based (5% drift) slightly outperforms calendar-based
Annual rebalancing is “good enough” for most investors

The reason: rebalancing sells winners. Do it too often and you cut off growth.

The 3 Strategies

Strategy	When to rebalance	Best for
Calendar	Same time each year	Simple, set-and-forget
Threshold	When 5%+ off target	Optimal but requires monitoring
Contribution	Use new money to rebalance	Tax-efficient, if adding money

My preference: Threshold + Contributions

I check quarterly. If drift is >5%, I either:

Redirect new contributions to the underweight asset, or
Sell/buy if contributions aren’t enough

This minimizes transactions while keeping allocations reasonable.

Example

Starting portfolio: $100,000 (70% stocks / 30% bonds)

Stocks: $70,000
Bonds: $30,000

After a 20% stock year: $114,000 total

Stocks: $84,000 (now 74%)
Bonds: $30,000 (now 26%)

Drift: 4% → No action needed yet

After another 15% stock year: $128,100 total

Stocks: $96,600 (now 75%)
Bonds: $31,500 (now 25%)

Drift: 5% → Time to rebalance

Action: Sell $6,400 of stocks, buy $6,400 of bonds → Back to 70/30

When NOT to Rebalance

In taxable accounts without losses to offset gains
When drift is under 5% (transaction costs eat savings)
Every time the market moves (that’s not rebalancing, that’s trading)

FAQ

“Won’t I miss gains by selling stocks?”

Yes, in the short term. But rebalancing is about risk management. Without it, your 70/30 portfolio becomes 90/10 after a long bull run—right before a crash.

“What about in retirement?”

Same principle, but consider selling from what’s up to fund withdrawals. Natural rebalancing.

“What if I’m adding money regularly?”

Direct new contributions to the underweight asset. This rebalances without selling.

Track Your Allocation

To know when to rebalance, you need to see your current allocation.

Tools that help:

Empower (free) — Shows allocation across accounts
Your 401k provider — Most have allocation views
PopaDex (disclosure: I work on it) — Multi-account, multi-currency

Or just a spreadsheet. The tool matters less than actually checking quarterly.

Summary

Check	Frequency
Review allocation	Quarterly
Rebalance	When 5%+ drift
Typical frequency	1-2x per year

Don’t overthink it. Set a quarterly reminder, check the drift, act if needed.