Monthly Investment Calculator — South Korea
See how a monthly investment grows over time at South Korea's historical returns. No signup, no account needed.
Enter a monthly amount, a return rate between 0% and 100%, and a duration above zero (up to 50 years) to see results.
Where to invest in South Korea
KOSPI long-term ≈ 5–8% KRW. Major AMCs: Samsung, Mirae Asset, KB, Shinhan. Retail platforms: Toss Invest, Kakao Pay Securities. IRP gets tax deduction up to 9M KRW/yr.
Returns are long-term historical averages, not guarantees - markets fall as well as rise. Invest for the long term and diversify.
The power of compounding
Investing ₩600,000 per month for 15 years at 6% p.a.:
- Future value: ₩175,363,684
- Total invested: ₩108,000,000
- Estimated gains: ₩67,363,684
That is roughly 1.6× your money - most of it from compounding. Scale the ₩600,000 to your own monthly amount, and remember that starting earlier matters more than investing more.
How to start - and stay - invested in South Korea
- Automate a fixed monthly amount so you invest through good months and bad.
- Start small; you can raise the amount as your income grows.
- Favour low-cost, diversified funds over picking individual stocks.
- Stay invested through market dips - time in the market beats timing the market.
The 15.4% tax on fund income — and the ISA workaround
The Korean equivalent of a SIP is jeokrip-sik pundu (적립식 펀드) — a fixed monthly amount into a fund. Interest and dividend distributions from a fund are taxed at 15.4% (14% national + 1.4% local surtax), withheld at source. The ISA (Individual Savings Account) wrapper gives residents a tax-advantaged allowance — tax-free up to a threshold and a reduced rate above it — making it the tax-smart way to run a regular fund plan.
The Bank of Korea has been raising rates through 2026 (top 1-year deposit yields around 3.45%), the low-risk alternative worth comparing against. This calculator defaults the assumed equity-fund return to 6% p.a., clearly a modelling assumption rather than a guarantee — commonly cited ranges run 4–8%.
Worked example: a 20-year installment fund plan
Investing ₩300,000 per month for 20 years at an assumed 6% annual return (monthly compounding):
- Future value: ≈ ₩138.6 million
- Total contributed: ₩72 million
- Estimated growth: ≈ ₩66.6 million
That ₩66.6 million of growth is taxed at 15.4% on distributions unless sheltered inside an ISA. Use the calculator above with your own monthly amount to see your own projection.
Frequently Asked Questions
How does a monthly investment work in South Korea?
You invest a fixed amount each month into funds or an index. You buy more units when prices are low and fewer when high (cost averaging), and returns compound over time.
What return can I expect in South Korea?
Long-term historical equity returns are around 6% per year here, though any single year can be sharply up or down. KOSPI long-term ≈ 5–8% KRW. Major AMCs: Samsung, Mirae Asset, KB, Shinhan. Retail platforms: Toss Invest, Kakao Pay Securities. IRP gets tax deduction up to 9M KRW/yr.
How much do I need to start investing in South Korea?
Most platforms let you start small and increase later. Setting up an automatic monthly investment builds discipline and smooths out market timing.
Should I invest a lump sum or monthly in South Korea?
Investing monthly spreads your entry across market ups and downs (cost averaging) and is easier to budget. A lump sum can do better in a steadily rising market but carries more timing risk.
Is investing better than a fixed deposit in South Korea?
Investing targets higher long-term growth but carries market risk; fixed deposits are safer but usually return less. Many people hold both, matched to their time horizon.
What is jeokrip-sik (installment fund) investing?
A fixed amount invested into a fund every month — the Korean equivalent of a SIP — buying more units when prices fall and fewer when they rise (won-cost averaging).
How is my fund income taxed in South Korea?
Interest and dividend distributions from a fund are taxed at 15.4% (14% national + 1.4% local), withheld at source. An ISA wrapper can shelter part of this — see the next question.
What is an ISA and should I use one?
The Individual Savings Account gives residents a tax-advantaged allowance for regular investing — gains up to a threshold are tax-free and a reduced rate applies above it. It's generally worth using for a long-term monthly fund plan.
Deposit at ~3.45% or a fund — which is better?
A deposit is the safer, lower-return choice, and a fund targets higher long-run growth with more risk. Many Koreans hold both: a deposit for near-term safety and a fund for long-term goals.
Is my fund's return guaranteed?
No — this calculator models an assumption (6% default). Fund values move with the market and can fall as well as rise; only the compounding maths shown is exact, not the return itself.
Does the Bank of Korea's 2026 rate hike change my investing plan?
It mainly lifts deposit and bond yields, not equities directly. It makes the safe alternative more attractive but doesn't remove the case for a diversified, long-horizon fund plan.
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Sources
Return assumptions and rates are compiled from each country's central-bank publications, recognized market-index data and the typical offerings of major providers, reviewed for 2026 and subject to change. Returns are long-term historical averages, not guarantees. See our methodology and editorial policy for how we source and update this data.
Additional sources for this page
15.4% interest/dividend withholding and ISA relief: PwC — Korea, Individual Income Determination. Top 1-year deposit yield ≈3.45% (Sep 2026): Seoul Economic Daily, 10 Sep 2026.