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What is Average Cost Basis?
Average cost basis (also called average cost per share) is the mean price you paid for a stock across all your purchases. When you buy shares at different prices over time, your average cost provides a single reference point to determine whether you're profiting or losing on your investment. This is especially relevant for investors who use dollar-cost averaging (DCA) strategies.
Dollar-Cost Averaging Explained
Dollar-cost averaging involves investing a fixed amount at regular intervals regardless of share price. When prices are high, you buy fewer shares; when prices are low, you buy more. Over time, this tends to lower your average cost per share compared to making a single lump-sum investment. Studies show DCA reduces the impact of volatility on portfolio performance.
Why Track Your Average Cost
Knowing your average cost is essential for tax reporting, performance evaluation, and investment decisions. In many jurisdictions, you need to know your cost basis to calculate capital gains or losses when you sell shares. Without accurate records, you may overpay taxes or miss legitimate deductions.
Tax Implications
When selling shares, the difference between your selling price and average cost basis determines your capital gain or loss. Short-term holdings (under one year) are typically taxed at higher rates than long-term holdings. Keeping accurate records of each purchase, including date and price, simplifies tax filing and helps you make tax-efficient selling decisions.
Building a Position Over Time
Many successful investors build positions gradually rather than investing all at once. This approach reduces the risk of buying at a market peak. Use this calculator to track your evolving average cost as you add to your position across multiple purchases at different price points.