Korea's National Growth Fund: 40% Deduction Isn't a 40% Refund — Here's Your Real Tax Saving

Update (July 7, 2026): After the first sale (May 22 – June 11) closed, a second sale has been made official. A second public-participation fund of roughly ₩600 billion is slated for Q3 2026, and the sub-fund manager selection notice went out in early July (Money Today, Jul 6, 2026). The retail sale schedule has not been officially fixed yet, so use the "marginal rate × deduction" math below to set your decision criteria in advance.

A single line — "the government deducts 40% of what you invest" — kept Korea's National Growth Fund (국민성장펀드, gukmin-seongjang-pundeu) in the news for a month. Its first sale ran May 22 to June 11 and has since closed. But if you read that "40%" as "you get 40% of your money back," your tax expectation may be two or three times too high. An income deduction is not a tax credit. Let's verify the three headline perks with actual numbers and find out what really lands in your pocket.

TL;DR

• The National Growth Fund is a public-participation investment fund where the government absorbs part of the losses and adds tax breaks. First sale closed May 22–Jun 11
• Eligibility: age 19+ (or 15+ with earned income). Barred from the dedicated account if you were subject to comprehensive financial-income taxation in the past 3 years
• The 40% deduction is not a 40% refund. It lowers your taxable base, so your real saving = deduction amount × your marginal rate
• Invest ₩30M → ₩12M deduction → roughly ₩1.98M back at a 16.5% marginal rate, or about ₩3.17M at 26.4%
• Dividends are taxed at a flat 9.9% (separate taxation) for 5 years, and the government covers up to 20% of losses first. But there's a two-layer lock: a 3-year tax-benefit hold and a 5-year closed-end maturity

What the National Growth Fund actually is

Under a "productive finance" banner, the government built this public-participation fund to channel household money into Korea's domestic capital markets. What sets it apart from an ordinary fund is two things the government adds: tax benefits (an income deduction plus separate taxation on dividends) and a partial loss buffer. In exchange, your money is locked up for a set period. The legal basis is Article 91-26 of the Restriction of Special Taxation Act (조세특례제한법), passed by the National Assembly on April 23, 2026, and the sale plan was officially announced in a Financial Services Commission (FSC, 금융위원회) press release on May 6 (FSC press release).

It's worth knowing where the fund's money goes. It is a collective investment vehicle that invests in companies across 12 advanced strategy industries — semiconductors, secondary batteries, bio, AI, defense, robotics, future vehicles, and more. In other words, this is not a "safe deposit" but an equity-type risk asset betting on the growth industries the government wants to nurture — recognize that first.

The key numbers first:

• Sale window: first round May 22–June 11 (3 weeks)
• Contribution cap: dedicated account ₩100M/year (₩200M over 5 years); general account ₩30M/year
• Tax-benefit retention requirement: 3 years. Redeem within 3 years and the entire amount of tax you saved is clawed back
• Fund structure: a 5-year closed-end fund — early redemption itself is blocked
• Eligibility limit: barred from the dedicated account if you triggered comprehensive financial-income taxation at any point in the past 3 years

Think of it as a deal: you lock up cash, and the government repays you in taxes and a loss cushion. So the real question is how much that repayment is actually worth.

The 40% deduction trap — it's not a 40% refund

This is where most people get it wrong. The deduction rate is tiered by your annual contribution (the amount invested) (FSC press release).

Max out at ₩70M and the deduction is 30M×40% + 20M×20% + 20M×10% = ₩18M, i.e. a maximum deduction of ₩18M.

But don't stop there. A deduction is not a "tax credit" that cuts your tax by that amount — it shrinks your taxable base (the income your tax is calculated on). So the tax you actually save is:

Real saving = deduction amount × your marginal rate

Say you invest ₩30M and get a ₩12M deduction. The same ₩12M deduction returns wildly different cash depending on your bracket (marginal rates shown include the 10% local income surtax).

Same fund, same money — yet the higher your bracket, the bigger the refund. Conversely, if you're early-career or in a low bracket, that "40% deduction" can translate into a refund of only around ₩1M. The "40%" is not a refund rate; it's the slice carved out of your taxable base. You have to know your marginal rate before you can see what this fund is worth to you.

Real saving by investment size — the full table

Combining the two tables above, here's "invest X, get back Y at each marginal rate" in one view. The deduction is the tiered rate applied cumulatively, and the saving multiplies that by your marginal rate (a ballpark, local tax included).

Two things jump out. First, the deduction rate is most efficient (40%) up to ₩30M. Going from ₩30M to ₩70M — 2.3x more money — only raises the deduction from ₩12M to ₩18M, a 1.5x bump. Second, for the same amount, a higher marginal rate means 2–3x more saving. So "how much to invest" matters less than "which bracket am I in."

The trap most people miss — the ₩25M combined deduction limit

Go one level deeper. The National Growth Fund deduction isn't all recognized on its own. It is applied only within an annual ₩25M combined ceiling that pools other income deductions — credit-card spending, housing-subscription savings (주택청약), housing funds, venture-investment associations, and so on.

Here's what that means in numbers. Suppose you already use ₩19M of income deductions through credit cards, housing subscriptions, etc. You then invest ₩30M in the fund, which calculates to a ₩12M deduction. But subtract your existing ₩19M from the ₩25M ceiling and only ₩6M of headroom is left. So only ₩6M of the ₩12M is recognized — the other ₩6M simply evaporates. The saving you expected gets cut in half.

The higher your salary — and the more credit-card and housing deductions you already claim — the easier it is to fall into this trap. Before subscribing, add up the income-deduction lines on your year-end tax settlement and check whether you have room under the combined ceiling. Otherwise you walk in chasing a "40% deduction" and end up with less than half.

9.9% separate taxation — better the wealthier you are

The second perk: dividends from the fund are taxed at a flat 9.9% (income tax 9% + local surtax 0.9%) under separate taxation (분리과세), for 5 years after you join.

Why does this matter? Normally, once your annual financial income (interest + dividends) tops ₩20M, the excess is bundled with your other income and hit by progressive comprehensive taxation of 6–45%. For high earners, dividends stack on top of salary and the rate jumps. The National Growth Fund's dividends skip that bundling and cap out at 9.9%. For a wealthy investor who'd otherwise face a 30–40% rate, that's a clear win. Why the ₩20M financial-income line matters so much is worked through with examples in the ₩20M comprehensive financial-income tax guide.

If your dividends are small and never reach comprehensive taxation, though, this perk barely moves the needle. When choosing separate over comprehensive taxation actually pays — the same principle — is covered in high-dividend ETF separate taxation 2026.

The 20% loss buffer — how far to trust it

The third and most eye-catching perk is loss protection. The government injects ₩120 billion of public funds as a junior (buffer) investor, so that for each sub-fund it absorbs up to 20% of any loss first (FSC press release). The government soaks up the first 20% slice of losses, and anything beyond that is on you.

Two caveats, though. First, this is not principal protection. Losses beyond 20% fall entirely on the investor — if the market drops 30%, 10 percentage points of that are yours. Second, the fiscal money (₩120 billion) is finite — as total subscriptions grow, the cushion felt per person can shrink. Reading "the government covers up to 20%" as "20% of my loss is guaranteed" leads you to underprice the risk. The tax breaks are the draw; this is not a product to buy on the strength of loss protection.

3 years or 5 years? — untangling the lock-up

Another thing that's easy to misread is how long your money is tied up. Sources mix "3 years" and "5 years," but the two are different in nature.

In short, 3 years is "the minimum you must hold to keep the tax breaks," and 5 years is "the fund's own operating maturity." Because it's a closed-end structure, passing the 3-year mark doesn't automatically turn it into cash either. The bottom line: this should be money you're prepared to lock up for 5 years. If it's cash you'll need within 3 years, the clawback risk piles on top — the worst case.

Pre-subscription checklist

Five things to weigh against your own situation, not the headline.

• You know your marginal rate — at 6.6% the refund is small; at 38.5%+ it can be large. Saving = deduction × marginal rate.
• You have room under the ₩25M combined deduction ceiling — if you already claim heavy credit-card / housing-subscription / housing-fund deductions, the excess evaporates.
• You were not subject to comprehensive financial-income taxation in the past 3 years — if you were, the dedicated (tax-advantaged) account is closed to you.
• It's spare cash you won't touch for 5 years — closed-end + 3-year clawback + 5-year maturity. Never your emergency fund or jeonse deposit.
• You can stomach advanced-industry equity risk — above the 20% cushion, the loss is yours. This is not a principal-guaranteed product.

If even one of the five is a "no," it's better to wait for the next round or first look at more refund-efficient, more liquid shelters like the 2026 ISA reform or a pension-savings account.

The first sale is over — what you can do now

The first sale closed on June 11. No need to panic if you missed it.

• A second sale has been announced. A second public-participation fund of roughly ₩600 billion is being prepared for Q3 2026, and the sub-fund manager selection notice was already published in early July (Money Today, Jul 6, 2026). The retail sale date and terms will be fixed by official notice — judge by that.
• Calculate your marginal rate first. As the table shows, this fund's value hinges on your bracket. If you're a high earner, the next round may be worth waiting for; if you're in a low bracket, more refund-efficient shelters like an ISA or a pension-savings account may come first.
• Make sure it's money you can lock up for 5 years. Closed-end + 3-year tax-benefit hold + 5-year maturity. If you'll need the cash within 3 years, the clawback risk stacks on top.

The National Growth Fund is a product where the real math — your marginal rate × the deduction (and whether you have headroom under the ₩25M combined ceiling) — matters more than the "40%" headline. Nail down that number, then judge the next opportunity.

Related tools

• Compound Interest Calculator — ballpark what a 5-year locked sum becomes at an assumed return

Further reading

• Comprehensive financial-income tax at ₩20M: when does the tax bomb hit? — the very comprehensive taxation that separate taxation shields you from
• What changed in the 2026 ISA reform — a leading, refund-efficient tax shelter

Sources

• Financial Services Commission (FSC) — National Growth Fund (public-participation type) sale plan press release (May 6, 2026)
• Money Today — Second public-participation fund: schedule and distributors taking shape (Jul 6, 2026)
• Korea Law Information Center — Restriction of Special Taxation Act, Article 91-26 (special taxation for National Growth Fund investment)
• National Tax Service tax-law portal — Restriction of Special Taxation Act lookup

This article is for information only and is not investment or tax advice. Program details, sale schedules, and eligibility may change — before subscribing, confirm the latest terms via the operator's documents and official government notices. Figures here cross-check publicly available data as of June 12, 2026.