What is an ISA: A beginner's guide to saving with an ISA

An ISA is a tax-saving account that allows you to save up to $4 million tax-free from savings to stocks in one account. here's a breakdown of eligibility, features, and tax benefits as of 2025.

What is an ISA A wealth-building solution in a time of low interest rates

ISA stands for Individual Savings Account. it is a comprehensive wealth management account that allows you to manage a variety of financial instruments, including deposits, funds, ETFs, stocks, ELSs, and bonds, in one account, while taking advantage of tax benefits. it was introduced by the government in March 2016 to help people build wealth in an era of low interest rates and an aging population.

The main feature of an ISA is profit and loss accumulation. in a regular account, if you make a profit of KRW 3 million on Fund A and lose KRW 1 million on Fund B, the entire KRW 3 million is taxed. in an ISA, you're only taxed on the net profit, which significantly reduces your tax burden. add to this the tax-free allowance, and the effect is zero tax.

Features of different types of ISAs Choose the right one for your income and investment style

ISAs are divided into two categories based on your income and how you invest. choosing the right type for your situation is the first step to maximizing your tax savings.

categorized by income

the Standard ISA is open to anyone aged 19 or over and a resident of South Korea, regardless of income. there are exceptions for those aged 15 to 19 who have earned income in the previous year. the tax-free limit is up to KRW 2 million in net income.

the low-income ISA is available to workers with a gross salary of KRW 50 million or less, business earners with a gross income of KRW 38 million or less, or residents with no income. the tax-free limit is increased to KRW 4 million, twice the amount of the regular type.

the Farmer's ISA is for farmers and fishermen with a combined income of 38 million won or less, and offers the same 4 million won tax-free benefit as the regular type. confirmation of farmer or fisherman status is required.

classification by management method

the trust type allows subscribers to choose their own products, and deposits and savings can be transferred. it can be opened at banks and securities firms, and charges a fee of 0.1 to 0.7 percent per year.

the discretionary type delegates management to a professional. it cannot be transferred, can be opened at banks and securities firms, and has an annual fee of 0.1 to 0.8 percent.

the brokerage type allows subscribers to trade domestic listed stocks by buying and selling directly. more than 4.5 million people, or about 70 percent of all ISA savers, have opted for the brokerage type.

contribution limits and tax benefits at a glance

under the current system, the annual contribution limit is KRW 20 million and the total contribution limit is KRW 100 million for both the regular and the low-income type.

the tax-free limit for the general plan is up to KRW 2 million in net profit, while the tax-free limit for the low-income plan and the farmer and fisherman plan is up to KRW 4 million in net profit. profits exceeding the tax-free limit are subject to a 9.9 percent segregated tax. this is a significant savings compared to the regular financial income tax of 15.4 percent.

more importantly, ISA profits don't count towards comprehensive financial income tax, which is especially beneficial for high-income earners who earn more than KRW 20 million in financial income per year.

there's also a limit rollover. if you don't max out your contribution limit in a given year, the unused portion will roll over to the next year. for example, if you only contributed 12 million won in 2025, your contribution limit for 2026 would be 20 million won plus 8 million won.

eligibility and enrollment details

eligibility requirements

any Korean resident aged 19 or older can enroll. those between the ages of 15 and 19 who have earned income in the previous year can also join by submitting an income verification certificate. however, those who have been subject to comprehensive financial income tax in at least one of the previous three years are not eligible.

as an important principle, only one person can open an account across all financial institutions. you can only choose one type of account: trust, discretionary, or brokerage. if you want to change to another type, you can utilize the account transfer system without termination.

how to sign up

apply in person at a financial institution branch or via mobile app. all you need is an ID card for the regular type, while the low-income type requires an income verification certificate from the National Tax Service Home Office. farmers and fishermen will additionally need to provide a farmer or fisherman certificate.

What you can invest in an ISA

The products available within an ISA vary by type. brokerage ISAs offer the widest range of investment options.

you can invest in domestic listed shares (brokerage only), domestic listed ETFs and ETNs, funds (domestic and international), REITs, ELSs and DLSs, bonds (brokerage only), RPs, and deposits and savings (trust only).

you can't invest in foreign-listed stocks, foreign-listed ETFs, unlisted stocks, futures and options, and ELWs.

if you want to invest in foreign stocks, you can use domestically listed foreign ETFs. ETFs that track foreign indices that are listed on the domestic stock market, such as the TIGER US S&P500 or TIGER US Nasdaq 100, can be bought and sold in an ISA.

Five powerful advantages of ISAs

first, it's tax-free and low-rate taxation. the first $2 million to $4 million of net income is taxed at zero, and the excess is taxed at 9.9 percent, which is lower than the regular rate of 15.4 percent.

second, gain and loss pooling reduces your effective taxes. if you earned $5 million on a fund and lost $3 million on an ELS, you would incur a tax of $770,000 on the $5 million multiplied by 15.4 percent in a regular account, but in an ISA, the net gain of $2 million is within the tax-free limit, resulting in zero tax.

third, the tax-deferral effect increases compounding returns. taxation is deferred on profits earned during the investment until the time of termination, increasing the compounding effect as money that would otherwise escape tax is reinvested.

fourth, you can avoid comprehensive taxation of financial income. ISA gains are taxed separately and don't count towards your overall income, so they don't affect your health insurance premiums.

fifth, you get additional tax relief when you roll over your ISA. if you roll over maturing funds into a pension savings or IRP, you can get an additional tax credit of 10% of the amount rolled over, up to a maximum of $3 million.

ISA drawbacks and caveats

the 3-year lock-in period is the biggest limitation. if you close it before three years, you'll lose all tax-free and tax-separated benefits, and you'll have to pay back the tax you've saved. however, you can make an unlimited number of early withdrawals up to the amount of your contributions. however, the contribution limit will not be restored.

you can't invest directly in foreign stocks. you can't buy individual overseas stocks like Tesla or Nvidia, but you have to go through a foreign ETF listed in Korea.

there is an annual contribution limit of KRW 20 million and a total of KRW 100 million, which can be limiting for high net worth investors. it's also worth considering that trust and discretionary ISAs come with management fees of 0.1 to 0.8 percent per year.

how our experts recommend using an ISA

a guide to choosing a type

choose a brokerage if you want to invest in stocks yourself, a trust if you want to keep your money in a safe place, or a self-directed if you want to leave it to a professional. if you want to minimize fees, an uncompensated brokerage is the way to go.

the three-year pension conversion strategy

this is the most effective way to use your ISA. Keep your ISA for three years, then close it and convert it to pension savings or an IRP within 60 days. if you convert £3,000, you'll get an additional £3,000 tax credit. you can then reopen the ISA and repeat the cycle every three years, which can result in significant long-term tax savings.

combine tax-saving accounts

ISAs can be used in conjunction with pension savings and IRPs. While ISAs don't offer tax relief, they do offer tax-free growth and profit and loss, and if you roll your ISA into a pension at maturity, you can save up to £3 million on top of your existing tax allowance, so it's best to use all three accounts together.

frequently asked questions

Q Can I open multiple ISA accounts A No. You can only open one ISA account per person across all financial institutions. you cannot open additional accounts with other brokerages or banks.

Q What happens if I close my ISA early A If you close your ISA before three years, all tax benefits will be lost and you will be taxed at the normal rate of 15.4% and any tax relief will be collected. there are exceptions for special reasons such as death, relocation abroad, retirement, or hospitalization for more than three months.

Q What should I do after maturity? A You have three choices. you can extend the maturity and continue investing, close it and rejoin to create a new tax-free allowance, or convert it to a pension account to receive additional tax relief.

Q Can I switch from a traditional ISA to an intermediary A Yes, you can. with a transfer, you can change the type without closing it and keep the remaining maturity and tax benefits. however, you will need to sell your holdings and transfer them to cash.

Q Do ISAs count towards my year-end tax return A ISA contributions themselves are not tax deductible. Only when maturing funds are rolled over into an annuity account is 10% of the roll-over amount, up to a maximum of KRW 3 million, added to your tax credit.

the bottom line

An ISA is a great account for anyone with investment income, but it's especially important for those who earn a lot of financial income and are worried about overall taxation, those who invest in products with volatile gains and losses, and those who want to build long-term wealth and save for retirement at the same time.

the three-year mandatory term may seem daunting, but you can withdraw your contributions at any time, so liquidity isn't a big concern, and the profit and loss allowance and 9.9 percent marginal tax rate alone offer significant savings over a traditional account.

if you don't have an ISA now, start with a brokerage ISA. you can open one in as little as five minutes online through your broker's app and start by investing in domestic ETFs or blue-chip stocks.