When trading stocks, there's something easy to overlook if you're only considering profits, and that's the issue of fees. Even if you achieve the same rate of return, the final profit can vary greatly depending on how much you reduce the fees, and surprisingly few people realize this.

Every time you buy or sell stocks, you pay various costs such as brokerage commissions, exchange fees, and if it's overseas stocks, currency exchange fees as well. Domestic stocks are relatively inexpensive, but overseas stocks typically have a basic fee of about 0.25%, plus additional costs accumulate.

Comparing fees across different brokerages shows quite a difference. Mirae Asset Securities charges 0.136% domestically and 0.25% for overseas stocks, while Korea Investment & Securities charges 0.147% domestically and 0.25% overseas. Samsung Securities adds a fixed fee of 1,500 won plus 0.147216% for small transactions. Kiwoom Securities offers the lowest at around 0.015% on the Hero M4 platform, and Shinhan Investment Corp. charges 0.1391639% plus 2,000 won for transactions under 30 million won. Because each brokerage has a different fee structure, where you trade makes a direct impact on your profits.

A particularly noteworthy point is the fixed fee part. 1,500 or 2,000 won might seem negligible, but if you trade 100 times, that adds up to 150k to 200k won. For people who trade frequently with small amounts, this can be a significant burden. Even if you trade 1 million won ten times and earn a 10% profit each time, the final profit would be about 2.57 million won with a 0.1% fee, and about 2.54 million won with a 0.2% fee—a difference of 20,000 to 30k won. As the trading volume and frequency increase, this gap widens further.

Fortunately, most major brokerages are running new customer promotion events offering fee discounts. Mirae Asset Securities waives fees for domestic and US stocks for 90 days, and Shinhan Investment Corp. offers a full year of fee exemption. Korea Investment & Securities, Samsung Securities, and Kiwoom Securities also provide about three months of fee waivers. If you're opening a new account or haven't used an account for a while, taking advantage of these events is a smart move.

The first tip is to understand each brokerage’s fee structure precisely. Don't just choose based on the apparent fee rate. Some, like Shinhan Investment Corp., charge additional fixed fees, and the transaction amount thresholds differ. The second is to manage your trading frequency and volume. It's better to buy in one go rather than multiple smaller trades to reduce fees. The third is to consider the trading platform, as some brokerages, like Kiwoom Securities, offer significantly cheaper fees on specific platforms.

If you frequently trade overseas stocks, you also need to pay attention to currency exchange fees. Often, the exchange rate offered by brokerages is worse than what banks provide. It's wise to exchange currency in advance when rates are favorable or check for preferential exchange rate benefits from your brokerage.

Ultimately, choosing a brokerage that fits your trading pattern is the most important. If you mainly do small, quick trades, opt for one without fixed fees. If you trade large amounts at once, choose a broker with a lower fee rate relative to the transaction amount. Even when aiming for the same profit, reducing the fee differences among brokerages can significantly impact your final earnings. It’s worth taking the time to compare carefully, even if it’s a bit of a hassle.