Which Is Bigger, Taxes or Fees — The Priority of Costs
What if, while straining to save a few hundred won in fees, you are missing tens of thousands of won in taxes? Costs, too, have a "bigger one" and a "smaller one."
Costs Have an Order of Size
Investment costs come in many forms — fees, transaction taxes, income taxes — but they vary in size. If you save on a small cost while missing a large one, it is a case of the tail wagging the dog.
Setting a rough order of size for a Korean investor: the domestic-stock brokerage commission is very small, the securities transaction tax is larger than that, and dividend and capital-gains taxes often become the largest cost. It is important to get a sense of what to worry about first.
A Rough Size Comparison (Korea Basis)
Domestic-stock online brokerage commissions are very small, at the 0.01% range (or below) on a non-face-to-face basis.
By contrast, the securities transaction tax is 0.15% on selling for KOSPI and KOSDAQ as of 2025, far larger than the commission. If you trade frequently, this transaction tax overwhelms the commission.
Taxes are larger still. The dividend income tax is 14% (15.4% including local income tax), and the capital-gains tax on overseas stocks is 22% (with an annual basic deduction of 2.5 million won). If you made a large gain, this tax accounts for most of the cost.
Tax rates and transaction tax rates change often. For example, the securities transaction tax is scheduled to rise to 0.20% in 2026. The actual applicable rate depends on the tax law at that time and on your own situation, so verification is needed.
How to Set the Priority
In short, when managing costs, you should look at "the big ones first."
First, reducing the number of trades cuts the transaction tax and commissions at the same time and defers the tax burden on realized gains. This has the biggest effect.
Second, using tax-advantaged accounts (ISA, pension accounts, etc.) can reduce taxes, the largest cost.
Third, only after that do you pick a brokerage or product with low fees. If you reverse the order and dig only into fees, the large taxes keep leaking out.
Preguntas frecuentes
Q. So do I not need to worry about fees?
That's not it. Especially if you trade frequently or trade overseas stocks often, fees and the FX conversion spread cannot be ignored either. The key is simply not to make the mistake of tending only to fees while missing taxes. Manage costs in order, starting with the big ones.
Q. Is long-term investing also advantageous from a tax standpoint?
If you do not trade often, realizing gains is deferred, which also delays when taxes are paid, and transaction taxes and fees are reduced. However, you should also remember that tax is ultimately charged when you realize, so it is "deferral," not "exemption," and that tax law can change.
Páginas relacionadas
📋 Los resultados se basan en datos históricos; las rentabilidades pasadas no garantizan rentabilidades futuras.
📋 Este servicio se ofrece con fines educativos para ayudarte a entender la inversión, no como asesoramiento de inversión.