Investment Fees Explained -

Why Costs Matter More Than You Think

Investment fees are easy to overlook — they are small percentages that appear in the fine print. But over time, they have a significant and measurable impact on the final value of your portfolio.

Why Fees Matter

When you invest, you do not keep all of the returns. A portion goes to fees — to the fund provider, the platform, or both.

These costs reduce your return every year. And because investing is built on compounding, fees compound too. You do not only lose the fee itself — you also lose all the future growth that money could have generated.

This is why costs matter more than most investors initially realize.

Types of Investment Costs

Different investments carry different types of fees. The most common include:

Total Expense Ratio (TER) — the annual fee charged by a fund, expressed as a percentage of the amount invested. This is the most important fee to understand for long-term investors.

Trading fees — charges applied when buying or selling investments on a platform or through a broker.

Spreads — the difference between the buying price and the selling price of an asset. This is a cost that is not always visibly stated.

Account fees — some platforms charge a flat fee for maintaining an investment account.

Performance fees — charged by some active funds when returns exceed a defined benchmark.

Some of these costs are clearly stated. Others are built into the product and less visible. Understanding what you are paying — in total — is an important part of evaluating any investment.

The Long-Term Impact of Fees

The difference between a low-cost and a high-cost investment may appear small in any single year. Over time, the gap becomes significant.

Consider 100,000 THB invested at 6% gross return per year over 10 years:

Low-cost option  (0.2% annual fee):  Final value ≈ 176,000 THB
High-cost option (2.0% annual fee):  Final value ≈ 158,000 THB

Difference after 10 years:           ≈ 18,000 THB

Over 20 or 30 years, this gap compounds further — often reaching hundreds of thousands of baht on larger portfolios.

The investor in both cases made the same decisions and took the same market risk. The only difference was cost.

What You Can and Cannot Control

Markets are unpredictable. Returns fluctuate. Economic conditions change.

But fees are largely within your control. Choosing lower-cost investment products is one of the few decisions that directly and predictably improves long-term outcomes — regardless of what markets do.

This is why cost awareness is considered a core principle of sound investing.

Practical Guidelines

Compare TERs before investing — passive ETFs typically range from 0.05% to 0.50% per year. Active funds often charge 1.0% to 2.0% or more
Understand the total cost — not just the fund fee, but also platform fees and trading costs
Avoid unnecessary trading — each transaction may carry a cost, and frequent trading adds up
Be cautious with complex fee structures — if the costs are difficult to understand, that is a reason to look more carefully before investing

Key Takeaways

Investment fees reduce returns every year — and that reduction compounds over time
The difference between low-cost and high-cost products becomes significant over 10, 20, or 30 years
You cannot control market returns, but you can control costs
Passive ETFs generally offer lower fees than actively managed funds
Understanding what you pay is a fundamental part of making good investment decisions

Frequently Asked Questions

What is a reasonable fee for an ETF?
Most broad market ETFs charge between 0.05% and 0.50% per year. Anything above 1.0% deserves careful evaluation — particularly for passive or index-tracking products.

Are higher fees ever justified?
In some cases, higher fees may be appropriate — for example, in specialized markets where active management adds genuine value. But this should be verified, not assumed. The default position should be to prefer lower costs unless there is a clear reason not to.

Where can I find the TER of a fund?
The TER is disclosed in the fund’s Key Investor Information Document (KIID) or factsheet. It is also listed on most investment platforms and financial data websites.