Are you aware that stock trading fees can be much higher than you think? Many investors focus only on their return, overlooking the losses caused by fees. In fact, the cumulative impact of stock trading fees over the long term can be substantial, so it can be quite helpful to understand this in advance.

First, when looking at what costs arise in domestic stock trading, there are brokerage commission fees paid to securities firms, as well as fees paid to related institutions such as the Korea Exchange or the Korea Securities Depository. For overseas stocks, currency exchange fees are added on top of this, making everything much more complicated. For U.S. stocks, in addition, fees from the Securities and Exchange Commission and FINRA are also charged.

Looking at the domestic stock fees of major securities firms, there are quite noticeable differences. Some charge around 0.136%, while others charge fixed fees in addition, for example 0.147% or higher. Especially for investors who frequently trade small amounts, these fixed fees can be a real burden. For example, some firms add a fixed fee of 1,500 won for trades under 10 million won—so after 100 trades, that becomes 150,000 won.

Overseas stock fees are mostly similar at around 0.25%. However, recently there have been many events that waive fees for new customers for 3 months to 1 year, so if you take advantage of them, you can significantly reduce your initial costs.

If you think about how much stock trading fees affect your final returns with a simple example: suppose you trade 1 million won 10 times and make a 10% profit per trade. When the fee rate is 0.1% versus 0.2%, the difference in final profit is about 20,000 to 30,000 won. The bigger the amount and the more frequent the trades, the greater this difference becomes.

To reduce fees, first you should accurately understand the fee structure of the securities firm you use often. Fees differ depending on the trading amount and the platform. Next, another good approach is to take advantage of fee-waiver events for new customers. Especially if you can choose when you start receiving the benefits, it’s wise to apply right before you begin active trading.

Trading frequency and size also matter. If your style is frequent small, short-term trades, it’s better to choose a firm with no fixed fees. If you trade a large amount at once, then you should choose a securities firm where fees decrease as trading volume increases. Also, when trading overseas stocks, you should factor in currency exchange fees and exchange rates. Securities firms often have less favorable exchange terms than banks, so it’s best to prepare in advance.

In the end, the key is to choose the securities firm with the lowest stock trading fees that fits your trading pattern, take full advantage of any available events, and reduce the number of trades. Once small fee differences add up, they ultimately show up as substantial differences in profit—so paying attention in advance can become a foundation for long-term investment success.