Stock Profit & Loss Calculator

How to Calculate Stock Profit

Stock profit or loss is calculated based on the difference between your sell price and buy price, multiplied by the number of shares. The basic formula is: Gross P&L = (Sell Price - Buy Price) x Number of Shares. However, for an accurate result, you must also deduct trading fees and taxes.

Example: Buy 100 shares of VCB at 80,000 VND, sell at 88,000 VND. Gross profit = (88,000 - 80,000) x 100 = 800,000 VND. After deducting brokerage (0.15% buy + 0.15% sell) and selling tax (0.1%), the actual net profit will be lower. This calculator automatically computes all fees for you.

Vietnam Stock Trading Fees Explained

When trading stocks on Vietnamese exchanges (HOSE, HNX, UPCOM), investors face two main cost categories:

• Brokerage fee — The commission paid to your securities company for executing buy and sell orders. The standard rate is 0.15% of the transaction value per side (buy and sell). Some brokers like MBS may offer lower rates (0.12%) for high-volume traders. This fee applies to both buy and sell orders.
• Selling tax — Personal income tax on securities transfer, fixed at 0.1% of total sell value. This tax only applies when selling, not buying. It is a flat tax applied regardless of whether you make a profit or loss on the trade.

The total cost for a complete round-trip trade is approximately 0.4% of capital (0.15% buy fee + 0.15% sell fee + 0.1% selling tax). This means a stock needs to rise at least 0.4% from your buy price just to break even.

Capital Gains Tax on Stocks

In Vietnam, personal income tax on securities transfer can be calculated two ways: a flat 0.1% on total sell value (the most common method, applied by default), or 20% on net capital gains (requires detailed income and expense reporting).

Most individual investors use the 0.1% method because it is simple and automatically deducted at source by the securities company. With the 20% method, you need to prove your weighted average cost basis, transaction costs, and losses for deduction — much more complex but potentially beneficial if you had a losing year.

This calculator uses the 0.1% flat tax as default, which matches how most individual investors in Vietnam are taxed.

DCA Strategy for Stock Investing

DCA (Dollar Cost Averaging) is an investment strategy where you buy a fixed amount of stock at regular intervals (weekly, monthly) regardless of market price. The goal is to reduce the impact of short-term price volatility on your average cost basis.

Example: Instead of buying 10 million VND of FPT stock at once, you buy 2 million each month for 5 months. If FPT fluctuates between 130,000 to 120,000 to 125,000 to 135,000 to 128,000 VND, your average cost will be approximately 127,600 VND — significantly lower than a lump-sum buy at the peak of 135,000 VND.

• Advantages — Reduces risk of buying at the top, no market timing needed, enforces investment discipline, ideal for long-term investors.
• Disadvantages — In a consistently rising market, DCA yields lower returns than lump-sum investing. Transaction costs accumulate from multiple small orders.

Common Mistakes for New Investors

Many new investors make avoidable mistakes when starting their stock trading journey:

• Ignoring transaction costs — The 0.4% round-trip cost seems small but adds up significantly for frequent traders. Short-term scalpers need at least 0.5% profit per trade just to break even.
• Not setting stop-losses — Holding losing stocks hoping they'll recover is the most common mistake. General rule: cut losses at 7-10% to preserve capital.
• Following the crowd — Buying "hot" stocks from social media or forums without doing your own research. By the time you hear about it online, the price has usually already risen — you end up buying at the top.
• Lack of portfolio diversification — Putting all money into 1-2 stocks. If the company faces issues, your entire capital is at risk. Diversify across at least 5-10 stocks in different sectors.
• Overtrading — Trading every day increases transaction costs and reduces returns. Research consistently shows that investors who trade less tend to perform better over the long term.