South Korea: 19% flat rate and 5 year break

South Korea offers foreign employees something unusual: the choice of a 19% flat rate on their whole salary instead of the normal 6% to 45% scale. It sounds like a bargain, but at a typical US$100k salary the normal scale is actually cheaper.

This guide covers Korean personal tax for people moving to Korea in the 2026 tax year.

The key question is simple. Should you pick the flat rate or the scale, and is your foreign income paid or sent to Korea?

What's changed: Korea's tax on crypto gains still starts on 1 January 2027, as set by the December 2024 amendment, so 2026 is the last untaxed year. The digital nomad (workation) visa became permanent on 30 June 2026, with a stay of up to three years. The 2026 health insurance rate rose to 7.19%. Proposed, not law: the Government's 2026 Tax Revision Bill (3 August 2026) would raise the foreign employee flat rate from 19% to 21% and extend it to people who start work by 31 December 2029.

📋 South Korea tax at a glance for 2026

US dollar figures use about KRW 1,340 to US$1 (the US Federal Reserve's rate was KRW 1,342 on 9 October 2026). The won is written KRW.

The 19% flat rate for foreign employees

What is the flat rate, and should you use it? It's an option under article 18-2 of the Restriction of Special Taxation Act. If you're a foreign employee, you can have your Korean employment income taxed at a single 19% instead of the normal scale.

Image 1 — Korea's 19% flat rate only pays off on higher salaries

How it works:

• Who qualifies: foreign employees and officers (not day workers) who first start work in Korea by 31 December 2026. Work for a related company is mostly excluded.

• How long: tax years ending within 20 years of your first day of work in Korea.

• What's taxed: 19% of gross pay, with no allowances, deductions or credits. Local income tax takes it to 20.9%.

• How to apply: apply through your employer at year-end settlement, or when you file in May. Your employer can also withhold 19% monthly.

Is it worth it? Only on a higher salary. The flat rate taxes every won of gross pay, so for a single person with no other deductions the scale is cheaper up to roughly KRW 160 million (about US$120k). The National Tax Service says to work out both and compare.

Proposed, not law: the 2026 Tax Revision Bill would raise the flat rate to 21% and move the start-work deadline to 31 December 2029.

The 50% exemption for foreign engineers

A separate relief halves the income tax of qualifying foreign engineers and researchers for 10 years, if they start work by 31 December 2026. It covers technology licensing contracts of US$300,000 or more, experienced researchers in qualifying research institutes and designated foreign talent, so it isn't counted in our ratings.

👉 Korean Law Information Center: Restriction of Special Taxation Act, article 18-2 (in Korean)

👉 National Tax Service: Individual Income Tax and Benefit Guide for Foreigners 2026

👉 Ministry of Finance and Economy: 2026 Tax Revision Bill (proposed 21% flat rate)

When you become tax resident in South Korea

Nationality doesn't decide it. You're resident if you have a domicile in Korea, or a place of residence there for 183 days or more. A domicile is judged on the facts, such as family living with you and property in Korea.

You're also treated as having a domicile in Korea if either of these applies:

• you have a job that normally needs you to live in Korea for 183 days or more, or

• your family lives with you in Korea and your job or assets suggest you'll stay 183 days or more.

So if you move for a job contract of a year or two, expect to be resident from the start, not after 183 days.

The five-year rule for foreign income

Residents are normally taxed on worldwide income. But if you're a foreign resident who has had a domicile or residence in Korea for five years or less in total over the 10 years to the end of the tax year, foreign-source income is taxed only if it's paid in Korea or sent to Korea. Income you leave abroad isn't taxed.

Your salary for work done in Korea is Korean income, so it isn't covered. Keep separate accounts to show what you brought in.

How you stop being resident

There's no day count for leaving. You stop being resident once you no longer have a domicile or a 183-day residence in Korea, so move your home and family when you go. Keeping a home or family in Korea can keep you resident.

If you must file a return and you're leaving for good, file before the day you depart. Large shareholders in Korean companies who lived in Korea for five of the last 10 years also pay a departure tax on those shares.

Income tax rates for 2026

South Korea income tax rates for 2026

Source: Income Tax Act, article 55, unchanged since the bands were set for 2023.

Employees get an employment income deduction: above KRW 100 million of pay, KRW 14.75 million plus 2% of the excess, capped at KRW 20 million. Pension and health contributions and a KRW 1.5 million personal deduction also come off.

Worked example

• You're a single foreign employee, resident in Korea for 2026 and earning KRW 134 million (about US$100k).

• After the KRW 15.43 million employment income deduction, the personal deduction and KRW 9.14 million of social insurance, your taxable income is about KRW 107.9 million.

• Tax on the scale is KRW 22.33 million. After KRW 330,000 of credits, plus 10% local income tax, you pay about KRW 24.2 million, or 18%.

With the flat rate you'd pay 20.9% of KRW 134 million: KRW 28 million, or 21%. Add about 6.8% for pension, health and long-term care insurance, and the all-in cost is about 25% on the scale or 28% on the flat rate.

👉 National Tax Service: global income tax rates (in Korean)

Freelancing in South Korea

Self-employed profit is taxed on the same scale. Clients usually withhold 3.3% (including local income tax), and you settle the balance in your May return.

Social insurance makes freelancing costly. You pay the full 9.5% National Pension contribution on capped income, and health insurance for self-employed (regional) members is charged on your income at the full 7.19% plus long-term care, with an amount for property on top. On US$100k of profit that's about 37% all-in.

There's also no general freelance visa for foreigners. Proposed, not law: the 2026 Tax Revision Bill would cut the 3% withholding rate on personal services income to 2%.

👉 National Health Insurance Service: how regional members' premiums are calculated (in Korean)

Crypto, investments and pensions

Is crypto taxed in South Korea? Not yet. Tax on virtual asset income was postponed by two years in December 2024, so it starts with disposals and lending from 1 January 2027. This is already law:

• net gains from selling or lending virtual assets are taxed separately at 20% (22% with local income tax), after a KRW 2.5 million yearly allowance

• for assets you already hold, the cost is the higher of what you paid and the market value on 31 December 2026

• you report the gains in your May return

Proposed, not law: bills in the National Assembly would delay the start again, to 2029 or 2030. The Government's 2026 Tax Revision Bill keeps the 1 January 2027 start.

On a US$100k gain in 2027, that's about 22%. If you're under the five-year rule, it's not settled whether crypto on a foreign exchange counts as foreign income, so take advice before relying on it.

Other investments are taxed like this:

• Interest and dividends: 14% is withheld when paid in Korea (15.4% with local income tax). If your interest and dividends total KRW 20 million or less for the year, they're taxed separately. Above that, they're added to your other income and taxed on the scale.

• Korean listed shares: small shareholders' gains on the exchange aren't taxed. Large shareholders (for example KRW 5 billion of one company) pay 20% or more.

• Foreign shares: 20% (22% with local income tax) after a KRW 2.5 million yearly deduction, but only if you've had a domicile or residence in Korea for five years in a row up to the sale. Before that, gains on foreign shares aren't taxed.

• Pensions: pension income gets a deduction of up to KRW 9 million before tax on the scale. A foreign pension kept abroad isn't taxed while the five-year rule applies.

Korea's inheritance tax is steep. If the person who dies was resident, their worldwide estate is taxed at 10% to 50%, with 50% above KRW 3 billion, after deductions that include a KRW 500 million lump sum. For a non-resident, only assets in Korea are taxed.

👉 National Tax Service: taxation of virtual asset income from 2027 (in Korean)

👉 National Tax Service: withholding tax on interest and dividends (in Korean)

👉 National Tax Service: capital gains tax on Korean and foreign shares (in Korean)

👉 National Tax Service: capital gains tax rates (in Korean)

👉 National Tax Service: inheritance tax calculation and rates (in Korean)

Social insurance

Foreign residents generally join Korea's schemes just like Koreans:

• National Pension: 9.5% of standard monthly income, split 4.75% each between you and your employer. Income is capped at KRW 6.59 million a month from July 2026 to June 2027.

• Health insurance: 7.19% of pay for 2026, split equally, so 3.595% for you. Long-term care insurance adds 0.9448% of pay, normally shared the same way.

• If you're not employed: foreigners who have stayed in Korea for more than six months must join health insurance as regional members.

You're excluded from the National Pension if your home country's scheme doesn't cover Koreans, or you hold a certificate of coverage under a social security agreement. A lump-sum refund on leaving depends on nationality: the NPS list includes the US, Canada, Germany and Australia, but not the UK.

👉 National Pension Service: contribution rate and income limits

👉 National Pension Service: coverage of foreigners and lump-sum refunds

👉 National Health Insurance Service: guidance for foreigners

👉 National Health Insurance Service: 2026 health and long-term care insurance rates (in Korean)

Double tax treaties

Does South Korea have double tax treaties? Yes. The National Tax Service publishes the treaties Korea has with 95 jurisdictions, plus an arrangement with Taipei. Partners include the UK, the United States, Japan, China, Germany, France, Singapore, Australia, the UAE and India.

If you're resident in Korea and another country at once, the treaty's tie-breaker decides where you're treated as resident.

👉 National Tax Service: tax treaties with foreign jurisdictions

The digital nomad (workation) visa

Does South Korea have a digital nomad visa? Yes. After a pilot from January 2024, the Ministry of Justice made the digital nomad (workation) visa permanent on 30 June 2026.

• Income test: usually twice Korea's gross national income per head. On the 2025 figure of about KRW 52.41 million, that's about KRW 105 million a year (about US$6,500 a month).

• Lower tests: between one and two times GNI per head for people living outside the capital region, depending on age. An 18 to 34 year old outside the capital region needs one times.

• Length of stay: up to three years in total, up from two.

The visa doesn't change the tax rules: stay 183 days or more and you're likely to be resident.

👉 Ministry of Justice: digital nomad visa made permanent from 30 June 2026 (in Korean)

Who is South Korea good for?

How does South Korea compare for different kinds of mover? Ratings are relative to the 150+ countries TaxPilot covers, based on the 2026 tax year and the all-in cost including social insurance. The Retirees and Investment income ratings count the five-year rule, which covers most new arrivals.

☑️ Who is South Korea good for? Tax ratings for expats in 2026

Filing and deadlines

Employers withhold tax monthly and carry out a year-end tax settlement early the following year. If you only have salary from one employer and it's been settled, you don't need to file.

Otherwise you file a global income tax return between 1 and 31 May the following year. For 2025 income the deadline was 1 June 2026, because 31 May fell on a Sunday. For 2026 income, it's 31 May 2027.

You can still apply for the flat rate when you file, even if your employer settled your tax on the scale. Tax over KRW 10 million can be paid partly in instalments over two months. Hometax, the online filing system, is in Korean only.

👉 National Tax Service: English site, year-end settlement manual and filing guides

Frequently asked questions

What is the 19% flat tax rate for foreigners in South Korea?

Foreign employees who start work in Korea by 31 December 2026 can choose 19% of gross pay (20.9% with local income tax) for up to 20 years, with no deductions. A rise to 21% is proposed, not law.

Is the flat rate better than the progressive rates?

Not at every salary. For a single person with no other deductions, the normal 6% to 45% scale is cheaper up to roughly KRW 160 million of pay. Work out both each year and pick the lower.

What is Korea's five-year rule for foreign income?

If you're a foreign resident who has lived in Korea for five years or less in the last 10, foreign income is taxed only if it's paid in or sent to Korea.

How many days make you tax resident in South Korea?

You're resident if you have a domicile in Korea or a residence there for 183 days or more. A job that normally needs you in Korea for 183 days or more makes you resident from arrival.

Is crypto taxed in South Korea?

Not in 2026. From 1 January 2027, gains from selling or lending virtual assets above KRW 2.5 million a year are taxed at 20%, or 22% with local income tax.

Does South Korea have a digital nomad visa?

Yes. It became permanent on 30 June 2026. The usual income test is about KRW 105 million a year, lower for younger applicants outside the capital region, and you can stay up to three years.

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