Rebalancing Calculator

This calculator simulates a managed DCA strategy that automatically rebalances your portfolio. When value rises above the threshold, it sells. When value drops below, it buys. This helps you buy low and sell high automatically.

Target Settings

Target Balance ($) Dollar value to maintain

Current Stock Price ($)

Simulation Parameters

Rebalance Threshold (%) Trigger rebalancing when off by this %

Duration (Months)

Expected Volatility (%) Annual price volatility

Expected Annual Return (%)

Total Buys

0 transactions

Total Sells

0 transactions

Net Investment

Final Value

Current Shares

Avg Buy Price

Total Returns

0% gain

Recent Transactions

Understanding Portfolio Rebalancing

Portfolio rebalancing is an automated investment strategy that maintains a target allocation or dollar value. When your portfolio drifts beyond a set threshold due to price movements, you buy or sell to bring it back to target. This mechanically enforces the "buy low, sell high" principle without requiring you to time the market.

This simulator shows how automatic rebalancing would perform over time given expected volatility and returns, helping you understand the buy/sell dynamics before implementing the strategy.

How to Use This Simulator

Set your target balance (dollar amount to maintain)
Enter the current stock price
Set a rebalance threshold (typically 5-20%)
Choose simulation duration in months
Set expected volatility and annual return

The Rebalancing Formula

Rebalancing Formula

Trade = (Current Value − Target) ÷ Price

Positive Sell shares (value above target)

Negative Buy shares (value below target)

Benefits of Automatic Rebalancing

Forces systematic "buy low, sell high" behavior
Removes emotion from trading decisions
Maintains consistent portfolio allocation
Captures gains automatically in rising markets
Deploys capital automatically in falling markets

Choosing Your Threshold

The rebalance threshold determines how much drift you allow before acting. Lower thresholds (5%) mean more frequent trading but tighter control. Higher thresholds (20%) mean fewer trades but larger position swings. Most investors use 10-15% as a balance between activity and precision.

Frequently Asked Questions

How often should I rebalance my portfolio?

Rather than rebalancing on a schedule (monthly, quarterly), threshold-based rebalancing triggers only when positions drift beyond your set percentage. This is generally more efficient. However, monthly or quarterly checks combined with threshold triggers is a common practical approach.

What threshold should I use?

Most investors use 5-20% thresholds. Lower thresholds (5-10%) keep tighter control but require more trades. Higher thresholds (15-20%) reduce trading frequency but allow larger position swings. Consider transaction costs and taxes when choosing - in taxable accounts, higher thresholds may be more tax-efficient.

Does this simulation guarantee future results?

No. This simulation uses random price movements based on your expected volatility and return inputs. Real markets may perform differently. Run the simulation multiple times to see the range of possible outcomes. Use conservative assumptions for planning purposes.

What about taxes on rebalancing sales?

Each sale in a taxable account may trigger capital gains taxes. Consider using tax-advantaged accounts (IRA, 401k) for rebalancing strategies. In taxable accounts, you might use a higher threshold to reduce taxable events, or rebalance by directing new contributions rather than selling.

Can I apply this to my whole portfolio?

Yes, rebalancing works for entire portfolios across multiple assets. Rather than maintaining a dollar target, you'd maintain percentage allocations (e.g., 60% stocks, 40% bonds). When one asset class outperforms, sell some and buy the underperformer to restore your target allocation.