How Are Stock Trading Fees Calculated? Separate Buying and Selling Costs

For common Taiwan stocks, distinguish two costs first: brokers charge commissions on purchases and sales according to account terms, while sellers pay securities transaction tax, generally 0.3% of the sale value. These charges have different recipients and timing, so a brokerage discount does not discount every trading cost. TWSE: Commissions and transaction tax

If you buy for NT$10,000 and sell for NT$11,000, the price gain is NT$1,000. Net profit also deducts the purchase commission, sale commission and sale transaction tax. Each commission uses its own transaction value; the sale commission is not calculated on the original NT$10,000.

Who Charges What, and When?

This article covers typical individual investors trading Taiwan-listed common stocks through brokers. Tax rules were checked on September 8, 2026.

Brokers set commission rates based on transaction value, subject to rules concerning costs and trading risks. The commonly quoted 0.1425% is a brokerage rate basis, but broker terms may differ. TWSE: Taiwan investment guide

How to Calculate Brokerage Commission

The basic formula is:

Commission = transaction value × applicable account rate.

If the broker describes its price as a listed rate multiplied by a discount factor, check the factor carefully. For example, a listed rate of 0.1425% charged at 60% of that rate gives 0.1425% × 0.6 = 0.0855%.

Next, check four conditions:

1. Minimum charge. A minimum may apply when the percentage-based amount is too small.
2. Eligible transactions. Online orders, assisted orders, odd lots and scheduled investments may have different terms.
3. Rebates. Some accounts receive the discount immediately; others pay first and receive a later rebate, creating a difference between the initial statement and final net cost.
4. Rounding and aggregation. Check how decimal amounts and multiple fills of one order are treated.

For example, a broker with a minimum charge of NT$1 will charge NT$1 even if the percentage calculation produces less.

Stock Transaction Tax: Regular Trades and Day Trades

For general stock sales:

Transaction tax = sale value × 0.3%. Selling NT$50,000 therefore results in NT$150 of tax.

Under current Ministry of Finance guidance, qualifying cash day trades in Taiwan-listed stocks use a sale transaction tax rate of 0.15% through December 31, 2027. Conditions include the same broker, account and trading day, and matching stock type and quantity. Ministry of Finance: Stock transactions

Full Example: Buy for NT$10,000 and Sell for NT$11,000

Assume you buy 100 shares at NT$100 and sell all 100 on a different trading day at NT$110. For simple arithmetic, assume 0.1% commission on both sides, no minimum-charge differences, and no additional costs or dividends.

Net profit = 10,956 − 10,010 = NT$946.

Using the initial total outlay of NT$10,010 as the denominator, the net return is about 9.45%, below the 10% share-price increase from NT$100 to NT$110.

If you instead sell at NT$90 under the same assumptions, the sale value is NT$9,000, commission NT$9 and transaction tax NT$27. You receive NT$8,964 against an initial outlay of NT$10,010, giving a net loss of NT$1,046: the NT$1,000 price loss plus costs.

Why Does Selling at the Purchase Price Still Leave a Loss?

In the same example, selling for NT$10,000 still incurs an assumed NT$10 commission and NT$30 general transaction tax. You receive NT$9,960, which is NT$50 less than the original NT$10,010 outlay.

With fixed rates and no minimum-charge or rounding differences, an estimated break-even sale value is:

Break-even sale value = total purchase outlay ÷ (1 − sale commission rate − sale transaction tax rate).

Substituting 10,010 ÷ (1 − 0.001 − 0.003) gives approximately NT$10,050.20.

Minimum Commissions Matter for Small or Split Purchases

Assume every separate trade costs 0.1%, with a NT$5 minimum. Buying NT$5,000 once costs NT$5. Splitting that into ten independent NT$500 trades, each subject to the same minimum, costs NT$50 in total.

Spreading purchases over time can help with investing discipline, but it can also increase costs.

A practical comparison is to estimate your annual trade count and total fees using your planned investment amount and account terms. Then consider whether to adjust frequency, without committing more money at once than you can comfortably afford.

Transaction Tax, Dividend Tax and ETF Internal Costs

Securities transaction tax relates to sales. Dividend income tax relates to declaring dividend income. Supplementary health insurance premiums on dividends follow a separate set of rules.

For dividend reporting, see dividend income tax and filing methods. For supplementary premiums, see dividends and Taiwan's supplementary health insurance.

ETF management, custody and other internal fees are also different from the commission paid to a broker when ordering. See ETF internal costs. ETF transaction tax and exemptions can also differ from ordinary stock rules.

How to Check Your Account's Actual Costs

Open your broker's execution statement and identify transaction value, commission and transaction tax. Then check your account's fee schedule for order channels, minimum fees and promotional periods. If a rebate arrives at month-end, use that information to reconcile the period's net cost.

Stock Trading Cost FAQ

Is transaction tax still due when selling at a loss?

General stock transaction tax is based on sale value rather than profit, so a losing sale can still incur tax.

Does everyone pay 0.1425% in commission?

No. Actual costs depend on the broker and account, including discounts, minimum charges and order channels.

Can I negotiate a transaction tax discount with my broker?

Statutory transaction tax differs from brokerage commission. The reduced rate for qualifying day trades is a rule-based tax provision rather than a broker-negotiated discount.

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This article is for investment education and does not constitute personalized investment advice or a promise of returns. Stocks and crypto assets involve price volatility and possible loss of principal. Consider your financial needs and risk tolerance before investing.