"I heard once dividends go over ₩20M you get hit with a tax bomb." That's only half true. You do become subject to comprehensive taxation, but if you have no other income, the actual extra tax doesn't kick in until much, much later. The thing that should actually scare you is something else entirely. This guide lays out what the ₩20M threshold really means, with worked examples.
Check your own tax in the Capital Gains / Tax Calculator →
One-line summary
- If your yearly interest + dividends combined exceed ₩20M, you're subject to comprehensive taxation (금융소득종합과세, "financial income comprehensive taxation"). Exactly ₩20M does not count
- Up to ₩20M is settled by 15.4% withholding as separate taxation — only the excess is added to your other income and taxed progressively at 6-45%
- Because of comparative taxation (비교과세), if you have no other income there's ₩0 extra tax up to roughly ₩81.2M
- The real trap isn't the tax — it's losing your health insurance dependent status, which starts at ₩10M of financial income
What is financial income comprehensive taxation? The ₩20M threshold at a glance
Financial income (금융소득) is the sum of interest from deposits and bonds (interest income) plus dividends from stocks and funds (dividend income). Once this combined amount exceeds ₩20M in a single year, you become subject to comprehensive taxation.
| Annual financial income | Tax method |
|---|---|
| ₩20M or less | Separate taxation (settled by 15.4% withholding) |
| Exactly ₩20M | Separate taxation (not subject to comprehensive taxation) |
| Over ₩20M | Only the excess is added to your other income → progressive taxation |
You don't even need to file again. Up to ₩20M, the bank or brokerage already withholds 15.4% when paying interest or dividends — 14% income tax plus 1.4% local income tax — and that settles your liability.
₩20M or less vs over — separate vs comprehensive taxation
The key point is that it's "only the excess," not "the entire ₩20M," that gets added in. For example, if your financial income is ₩30M, the first ₩20M is still settled by 15.4% separate taxation, and only the remaining ₩10M is added to your other comprehensive income such as wages or business income.
This is where people often get confused. "If you go over ₩20M, the progressive rate hits the whole amount" is simply not true. Only the excess gets added in, and even after it's added in, the comparative taxation mechanism (explained below) filters it once more.
The 2026 income tax bracket table and comparative taxation — is it really a tax bomb?
When comprehensive taxation applies, progressive rates of 6-45% are applied by tax-base bracket. The 2026 bracket table is as follows.
| Tax base | Rate | Progressive deduction |
|---|---|---|
| ₩14M or less | 6% | 0 |
| ₩14M - ₩50M | 15% | ₩1.26M |
| ₩50M - ₩88M | 24% | ₩5.76M |
| ₩88M - ₩150M | 35% | ₩15.44M |
| ₩150M - ₩300M | 38% | ₩19.94M |
| ₩300M - ₩500M | 40% | ₩25.94M |
| ₩500M - ₩1B | 42% | ₩35.94M |
| Over ₩1B | 45% | ₩65.94M |
A separate 10% local income tax is added on top.
The real question is: "So the moment I go over ₩20M, do I get slammed with the full progressive rate?" The answer is no. Financial income comprehensive taxation applies comparative taxation (비교과세): the tax computed under separate taxation (a flat 14% on the whole amount) is compared with the tax computed under comprehensive taxation, and you pay only the larger of the two. So if you have no other comprehensive income at all, comprehensive taxation produces the same result as the 14% separate-taxation amount up to roughly ₩81.2M of financial income — meaning no extra tax to pay.
At what level of interest / dividends does extra tax actually start? (worked examples)
The key is whether you have other income. If you earn wages or business income, your progressive bracket starts higher up, so extra tax appears much sooner.
| Situation | Financial income | Does extra tax arise? |
|---|---|---|
| No other income (full-time investor / retired) | ₩30M | No (₩0 extra up to ₩81.2M) |
| No other income | ₩90M | Extra tax on the amount over ₩81.2M |
| ₩50M wage income | ₩30M | The ₩10M excess lands in the 24% bracket → extra tax arises |
| ₩100M wage income | ₩25M | The ₩5M excess lands in the 35% bracket → large extra tax |
In other words, "₩20M in dividends = tax bomb" is a story for people who already have other high income. For someone retired with only financial income, there's no major burden until the ₩80M-ish range. If you're curious about the after-tax return on a dividend portfolio, the fastest way is to simulate it yourself.
Check after-tax dividends in the Dividend Simulator →
The real trap is health insurance premiums — dependent status drops at ₩10M
What blows up before the tax does is health insurance. Even someone registered as a dependent (피부양자) of an employee family member and paying no premiums loses that dependent status once their combined annual income exceeds ₩20M.
The trap is the aggregation rule. If financial income (interest + dividends) exceeds ₩10M per year, the entire amount is counted toward combined income. At ₩10M or less, financial income is left out of the aggregation — but the moment it becomes ₩10.01M, the whole ₩10.01M is counted as income. In other words, the dependent-loss risk already begins at ₩10M, far below the comprehensive-taxation threshold of ₩20M.
| Criterion | Limit | Result if exceeded |
|---|---|---|
| Financial income inclusion | Over ₩10M | Entire amount counted as income |
| Combined income for dependent status | Over ₩20M | Lose dependent status |
| Property tax base | Over ₩900M | Immediate loss |
| Property ₩540M - ₩900M + income | Income over ₩10M | Loss |
Once you lose dependent status, you're converted to a regional subscriber (지역가입자) and, depending on income and assets, newly charged an average of roughly ₩150,000-₩300,000 per month in health insurance premiums. Even if comparative taxation blocks the income tax, the health insurance premium still comes due — so the real first line of defense in managing financial income is the ₩10M line.
Tax-saving strategies to stay under the ₩20M wall — ISA and tax-exempt accounts
The most practical solution is to remove income from the taxable base. The ISA account (Individual Savings Account, a Korean tax-advantaged wrapper) is the prime tool.
- Net profit inside an ISA is tax-exempt up to ₩2M (general type) or ₩4M (low-income / farmer-fisher type)
- The excess is taxed by 9.9% separate taxation (lower than the 15.4% on ordinary financial income)
- Income generated inside an ISA is excluded from financial income comprehensive taxation → helpful for managing the ₩20M and ₩10M thresholds
Note, however, that if you were subject to financial income comprehensive taxation even once in the past three years, you're restricted from newly opening a tax-exempt ISA. Splitting accounts between spouses to spread ownership, or adjusting the timing around ex-dividend dates to spread a single year's financial income, also helps manage the threshold lines. To gauge in advance how much deposit interest is piling up, you can check it with the simple-interest calculator.
Compare tax by scenario in the Capital Gains / Tax Calculator → — enter your buy/sell prices and exchange rate to instantly see the tax base and effective tax rate.
FAQ
Q. If my financial income is exactly ₩20M, am I subject to comprehensive taxation? A. No. The criterion is "over ₩20M," so exactly ₩20M is fully settled by 15.4% separate taxation. Go over by even ₩1 and the excess becomes subject to aggregation.
Q. I have ₩30M in dividends and no other income — how much extra tax do I owe? A. Because of comparative taxation, with no other comprehensive income there's ₩0 extra tax up to roughly ₩81.2M. At ₩30M the result equals the separate-taxation amount, so there's nothing extra to pay.
Q. If I become subject to comprehensive taxation, do I have to file separately? A. Yes. In a year you exceed ₩20M, you must file a final comprehensive income tax return the following May. At ₩20M or less, withholding settles everything and no separate filing is needed.
Q. What do you mean health insurance is scarier than the tax? A. The moment financial income exceeds just ₩10M, the entire amount is counted as income, threatening your dependent status (₩20M combined). Lose it and you're converted to a regional subscriber paying a new ₩150,000-₩300,000 per month. Comparative taxation may block the tax, but the premium still comes due.
Q. Are ISA dividends counted toward the ₩20M threshold? A. No. Income generated inside an ISA account is excluded from financial income comprehensive taxation. That's why running dividends through an ISA is advantageous for managing the ₩20M and ₩10M thresholds.
Related tools
- Capital Gains / Tax Calculator — instantly compute tax base and effective rate
- Dividend Simulator — check after-tax dividends for a mix of US dividend stocks and ETFs
- Simple Interest Calculator — see how close your deposit interest is to the ₩10M / ₩20M thresholds
This article is for informational purposes only; actual taxes and health insurance premiums may vary by individual circumstances. Investment and tax decisions are your own responsibility — consult a tax accountant or financial professional for important decisions.