Prepared by A-J | Author brand: 盡職生活｜阿J的普通人理財筆記
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-16 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
About the author/site · Vocus @WUCJ ↗ · Editorial policy
Page version: 2026-08-16 | Official or primary sources are preferred for material rules and figures. AI may assist structure, translation, and code, but is not used as the sole factual source.
Beginner principle: Understand the mechanics and risks before buying. Knowing orders, settlement, and costs matters more than finding a hot tip.
Brokerage rates are set by brokers
TWSE's investment guide explains that securities brokers set customer transaction commission rates based on trade value, so pricing can vary by broker and promotion.
Stock sales are subject to transaction tax
TWSE's current guide lists the ordinary stock transaction tax at 0.3% of sale proceeds, with separate temporary treatment for eligible day trades.
The bid-ask spread is also a cost
The gap between the best bid and best offer affects actual execution, especially in less-liquid securities.
Frequent trading compounds costs
More trades mean repeated commissions, transaction taxes, and spreads, which can materially reduce returns.
What to learn next
- No account yet: start with the account-opening guide
- Planning to buy ETFs: learn fund structure and premiums/discounts
- Considering leverage: first understand margin and stock-backed borrowing risks
Primary / official sources
General investing education only. Market rules and fees can change; use current exchange, regulator, and broker disclosures.