Complete Guide to ETF Investing with ISA Accounts | From Opening to Management

Anyone aged 19 or older (15+ for earned-income earners) can open one ISA account per person. The process can be completed in under 5 minutes via a brokerage app. Key broker selection criteria include: (1) ETF trading commissions — most major brokers like Kiwoom, Korea Investment, and Samsung Securities offer free or near-free ISA ETF trading; (2) product range — choose a "brokerage-type" (중개형) ISA to trade listed ETFs directly; (3) app usability and rebalancing features. You will need an ID and income verification documents. The mandatory holding period is 3 years, with a tax-free limit of KRW 2 million (general type) or KRW 4 million (low-income/farmer type).

Once your ISA account is set up, you can trade domestically-listed ETFs through your broker's mobile or desktop platform. The process mirrors regular stock trading: (1) deposit funds into your ISA (annual contribution limit: KRW 20 million), (2) search for your target ETF by name or code, and (3) place a limit or market order. Sale proceeds remain in the ISA for reinvestment. Important: withdrawing funds before the 3-year mandatory period may trigger account closure. For systematic investing, most brokers offer auto-buy features that purchase a set amount of ETFs each month.

One of the ISA's greatest advantages is profit-loss offsetting across all products within the account. For example, if you earn KRW 3 million from an S&P 500 ETF and lose KRW 1 million from a China ETF, you're only taxed on the net KRW 2 million profit. An effective rebalancing strategy involves reviewing your portfolio semi-annually or annually, and adjusting positions that deviate more than 5 percentage points from target allocations. Tax-loss harvesting — selling losing positions before maturity to offset gains — is particularly useful in ISA accounts. With zero-commission ETF trading, rebalancing is essentially cost-free.

After the 3-year mandatory period, you have three options: (1) Close the account and receive your proceeds — profits within the tax-free limit are untaxed, and excess gains are taxed at a flat 9.9%. (2) Transfer maturity funds to a pension account (IRP or pension savings), which grants an additional tax deduction of 10% of the transferred amount (up to KRW 3 million). This is the key strategy for maximizing dual tax benefits between ISA and pension accounts. (3) Immediately re-enroll in a new ISA to restart the 3-year tax-free cycle. The optimal strategy is to repeat: maturity → pension transfer (tax deduction) → immediate re-enrollment (new tax-free limit). This cycle lets you capture both tax-free gains and pension deductions every 3 years, making it an exceptionally powerful tool for long-term wealth building.