Portfolio Rebalancing Calculator

Frequently Asked Questions

How often should I rebalance?

Research from Vanguard suggests annual rebalancing or threshold-based rebalancing (e.g., when an allocation drifts 5 percentage points from target) produces nearly identical risk-adjusted returns with lower trading costs than monthly rebalancing.

How do I rebalance tax-efficiently?

First use new contributions and dividends to buy underweight assets. Then rebalance inside tax-advantaged accounts (IRA, 401k) where trades are tax-free. Sell appreciated assets in taxable accounts only as a last resort.

Does rebalancing improve returns?

Not reliably; it tends to slightly reduce returns in trending markets but reduces risk. The main purpose is risk control, not return enhancement. The "rebalancing bonus" is real but small (often 0-50 bps annually).

Should I rebalance during a crash?

Yes; that is when rebalancing adds the most value, by forcing you to buy depreciated assets. Investors who rebalanced into stocks in March 2020 or late 2008 captured outsized returns. Discipline matters more than timing.

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Estimates only. Not investment advice.

Investment Disclaimer: Estimates only. Not investment advice.

This calculator provides estimates for educational purposes only and is not investment advice. Past performance does not guarantee future results. Consult with a qualified financial advisor before making investment decisions. All investments carry risk, including potential loss of principal.

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How This Calculator Works

You list two to five holdings, each with its current dollar value and a target weight, set a drift threshold, and choose whether the account is taxable or tax-advantaged. The tool sums your holdings to a total, converts each position into its current percentage, and compares that to the target. Any position whose weight has drifted by at least your threshold is flagged. For every holding it reports the exact dollar trade - buy or sell - needed to hit the target, computes total turnover (the dollars changing hands), and recommends whether a rebalance is warranted. It first checks that your target weights sum to 100% and warns you if they do not.

Formulas Used

Current% = position value ÷ total portfolio value × 100. Target dollars = total × (target% ÷ 100). Drift = current% − target%, and a rebalance is flagged when |drift| ≥ threshold. Trade amount = target dollars − current value, where a positive number is a BUY and a negative number a SELL. Turnover = (Σ |trade amounts|) ÷ 2, expressed as a percentage of the portfolio - dividing by two because every dollar sold from one holding is bought into another.

Worked Example

Suppose a $100,000 portfolio targets 50% US stocks, 20% international, 25% bonds, 5% cash, but a strong year pushed US stocks to $60,000 (60%). With a 5% threshold, US stocks have drifted +10 points - flagged. The plan: SELL $10,000 of US stocks (target $50,000), BUY $5,000 of international (from $15,000 to $20,000), BUY $5,000 of bonds, and HOLD cash. Turnover is $10,000, or 10% of the portfolio - a textbook "sell high, buy low" reset.

Common Mistakes

Entering target weights that do not total 100% - the tool stops and asks you to fix the sum before producing a plan.

Rebalancing in a taxable account by selling winners, which can trigger capital gains that outweigh the benefit.

Setting the threshold too tight, causing frequent trades and unnecessary costs; too loose, and risk drifts far from plan.

Tripping the wash-sale rule by selling a loser and buying it back within 30 days.

Tips & FAQ

The common 5% drift rule - rebalance any asset more than 5 percentage points from target - captures most of the benefit while limiting trades, per Vanguard research. Approaches include calendar (rebalance every January or quarter), threshold (only when drift exceeds your band), and hybrid (check quarterly, trade only if past the band). In taxable accounts, prefer to rebalance by directing new contributions to underweight assets and harvesting losses before selling appreciated positions; in IRAs and 401(k)s you can trade freely with no tax impact. Educational only, not investment advice.

Portfolio Rebalancing Calculator

Frequently Asked Questions

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