Asset Allocation Rebalancing Tool

Calculate optimal rebalancing trades to maintain your target investment portfolio allocation. Essential tool for disciplined investors.

Portfolio Rebalancing Formula: To rebalance, calculate target value for each asset: (Target % × Total Portfolio Value). Then, Trade Amount = Target Value - Current Value.

Positive values mean you need to BUY that amount. Negative values mean you need to SELL that amount.

Save/Load Portfolio
Quick Actions
Portfolio History

Quick Portfolio Templates

Conservative (30/50/20)
Moderate (60/30/10)
Aggressive (80/15/5)
Bogleheads 3-Fund
All-Weather Portfolio

Portfolio Assets

Asset Name Category Target % Current Value ($) Current % Actions
%
$
50.0%
%
$
16.7%
%
$
27.8%
%
$
5.6%
Total Portfolio Value: $90,000.00
Advanced Settings
Tax Loss Harvesting
Automatically identify opportunities to offset capital gains with losses
%
Backtesting Options

Rebalancing Options

How should the rebalancing be calculated?
%
Minimum deviation from target to trigger a rebalancing trade
$
Add new money to invest during rebalancing (optional)
How should taxes affect the rebalancing strategy?

Understanding Portfolio Rebalancing

Portfolio rebalancing is the process of realigning the weightings of assets in a portfolio to maintain a desired level of asset allocation. Over time, some investments may grow faster than others, causing your portfolio to drift from its target allocation.

Why Rebalance?

  • Risk Management: Maintain your target risk level as market conditions change
  • Discipline: Enforce a systematic approach to buying low and selling high
  • Diversification: Ensure proper diversification across asset classes
  • Goal Alignment: Keep your portfolio aligned with your financial goals and time horizon

Common Rebalancing Strategies

1

Calendar-Based Rebalancing: Rebalance at regular intervals (e.g., quarterly, annually). Simple to implement but may not always be optimal.

2

Threshold-Based Rebalancing: Rebalance when an asset class deviates from its target by a predetermined percentage (e.g., 5%). More efficient than calendar-based.

3

Contribution-Based Rebalancing: Use new contributions to purchase underweighted assets. Minimizes trading costs and tax implications.

4

Opportunistic Rebalancing: Take advantage of market volatility to rebalance when assets are significantly mispriced relative to fundamentals.

Tax Considerations

  • Tax-Advantaged Accounts: Rebalancing in retirement accounts (401k, IRA) has no immediate tax consequences
  • Taxable Accounts: Consider tax implications of selling appreciated assets (capital gains tax)
  • Tax-Loss Harvesting: Combine rebalancing with selling losing positions to offset gains
  • Location Strategy: Place tax-inefficient assets in tax-advantaged accounts when possible

Enhanced Features:

  • Portfolio Persistence: Save and load multiple portfolio configurations
  • Virtual Scrolling: Handle large portfolios with smooth performance
  • Tax Loss Harvesting: Identify tax optimization opportunities
  • Historical Backtesting: Test strategies against historical data
  • Mobile Optimization: Simplified interface for mobile devices
  • Copy/Paste Support: Easily duplicate or transfer asset data

Frequently Asked Questions

Most financial advisors recommend rebalancing at least annually, or when your asset allocation deviates from your target by 5% or more. The optimal frequency depends on your portfolio size, trading costs, tax situation, and market conditions. Threshold-based rebalancing (used in this calculator) is often more efficient than calendar-based approaches.

Rebalancing in taxable accounts may trigger capital gains taxes. Consider these strategies: 1) Use new contributions to buy underweighted assets instead of selling overweighted ones, 2) Rebalance within tax-advantaged accounts first, 3) Implement tax-loss harvesting to offset gains, 4) Rebalance less frequently in taxable accounts to minimize tax events. This calculator includes options to account for tax considerations.

Tax-loss harvesting involves selling investments at a loss to offset capital gains taxes. This enhanced tool includes a tax-loss harvesting feature that identifies when selling a losing position could offset gains from rebalancing. It calculates potential tax savings and suggests optimal trades to minimize your tax liability while maintaining your target allocation.

Yes! The enhanced version includes a backtesting feature that lets you test how your portfolio would have performed historically. You can select different time periods (1, 3, 5, or 10 years) and rebalancing frequencies to see how your strategy compares to a simple buy-and-hold approach.

The mobile view optimizes the interface for smaller screens by simplifying tables, increasing touch target sizes, and adjusting layouts. When you enable mobile view, the asset table switches to a card-based layout that's easier to navigate on touch devices. You can toggle between mobile and desktop views using the "Mobile View" button in the header.