South Korea — Tax Residency (183 Days)

Summary

Day threshold

183 days of residence

Window

Calendar year (1 Jan – 31 Dec)

Triggers on

Day 183 — track a 182-day cap

Also triggers

Domicile in Korea (no day count)

New from 2026

Continuous 183 days across two tax years

Basis

Income Tax Act Art. 1-2(1); Enforcement Decree Arts. 2–4

Authority

National Tax Service (NTS)

You become a Korean tax resident once you have a place of residence in Korea for 183 days or more in the calendar year — or immediately, regardless of days, if Korea is your domicile. Because the statute triggers at 183, the last safe day is 182: that is the cap Bounded tracks, so the alarm fires on the day residence actually attaches. Residents are taxed on worldwide income, so the 183rd day is a real financial line, not a formality.

Who it applies to

This matters most if you are:

• A remote worker or consultant splitting the year between Seoul and somewhere else.
• On a long assignment or E-series visa and unsure whether your Korean days have crossed the line.
• An investor or founder who keeps an apartment in Korea while travelling for most of the year.
• A returning Korean national or dual national whose family and assets are still in the country.

It applies to individuals of any nationality. Note that the domicile limb catches people with very few Korean days: if your family, your job and your assets point to Korea, the NTS can treat you as resident without ever reaching the day count.

The rule — and why it exists

Article 1-2(1) of the Income Tax Act defines a resident as an individual who has a domicile (주소) in Korea, or a place of residence (거소) in Korea for 183 days or more. The Enforcement Decree fills in what each means:

• Domicile — the objective facts test. Domicile is judged by the objective facts of your living relationships: whether your family lives in Korea and whether your assets are there, plus an occupation that normally requires you to live in Korea. It is a status, not a count, so it can make you resident on your first day back.
• Place of residence — the 183-day limb. A place you live for a considerable time without the close general living relationship of a domicile. Once you have kept one for 183 days in a single taxable period, you are resident for that period.
• The 2026 addition. For tax years beginning on or after 1 January 2026, a continuous stay of 183 days that spans two tax years also makes you resident — a deliberate patch for people who split a long stay across New Year.

Why it exists: Korea taxes residents on worldwide income and non-residents only on Korean-source income, so the boundary has to be drawn somewhere. 183 days is the international more-than-half-a-year convention; the domicile limb stops people gaming it by counting days while their real life stays in Korea.

Counting the days

1. 1The count runs over the Korean tax period — the calendar year, 1 January to 31 December — and resets each 1 January.
2. 2Korea counts a stay from the day after your arrival to the day of your departure. Bounded counts the arrival day too, so it can run about one day per trip ahead of the official figure.
3. 3Days need not be consecutive; every qualifying day in the year aggregates into one total.
4. 4Trips abroad for sightseeing, medical treatment and similar purposes do not subtract days while you keep your place of residence in Korea.
5. 5Residence attaches once the total reaches 183. Bounded's cap of 182 means the alarm fires on exactly that day.

The over-count is deliberate: for a rule you are trying to stay under, an app that warns a day early is safer than one that warns a day late. If you are deliberately running close to the line, do the day-after-arrival arithmetic by hand for each trip and keep boarding passes and entry stamps.

Examples

Example 1 — the clean count

Ana rents an apartment in Seoul and spends 170 days there across the year, in four separate blocks, with the rest of her time in Singapore. She has no Korean family, job or assets. She stays under the 183-day limb and is a non-resident for that year.

Example 2 — resident on day one

Daniel signs a two-year employment contract with a Seoul company and his wife and children move with him. His occupation normally requires living in Korea and his family is there, so Korea is his domicile: he is a resident from arrival, and counting to 183 is irrelevant to him.

Example 3 — the holiday that did not help

Ji-min keeps a leased flat in Busan and has spent 175 days there. She flies to Thailand for a three-week holiday, expecting the clock to pause. It does not — she kept her place of residence in Korea, so the sightseeing trip still counts as Korean residence and she crosses 183 while abroad.

Exceptions & edge cases

• The 2026 cross-year limb. A continuous 183-day stay spanning two calendar years now makes you resident even if neither year alone reaches 183. A calendar-year counter cannot see this; check any stay that straddles 31 December manually.
• Long-term relief for foreigners. Foreign nationals who have had a domicile or place of residence in Korea for 5 years or less out of the last 10 are taxed on foreign-source income only when it is paid in Korea or remitted there. A separate flat-rate election exists for qualifying foreign workers.
• Crew, diplomats and deemed residents. Employees of Korean companies posted abroad, and certain public officials, can be deemed Korean residents by decree regardless of where they physically are.
• Treaty tie-breakers. If you are resident in Korea and in another treaty country at the same time, the treaty decides which one wins — usually by permanent home, then centre of vital interests. That analysis sits outside any day counter.
• Local income tax. Korean income tax carries a 10% local surtax on top of the national rate. Budget for it when you model the cost of crossing the line.

Common misconceptions

• "183 days is safe." It is not — 183 is the trigger. The statute says 183 days or more, so day 183 makes you resident. Track a 182-day cap.
• "Leaving the country pauses the count." Not if you keep a place of residence in Korea. Sightseeing and medical trips abroad are still treated as Korean residence.
• "Under 183 days means no Korean tax residency." Only if the domicile limb also fails. Family, occupation and assets in Korea can make you resident on very few days.
• "I can split a long stay across New Year." That worked before 2026. From tax years beginning 1 January 2026, a continuous 183-day stay across two years triggers residency too.
• "Arrival day does not count, so I have an extra day." Officially yes, but Bounded counts it — which means the app shows you slightly closer to the line than the NTS would. Treat the app as an early warning, not a ceiling to fill.

Related: the same days can matter for immigration status. If you are also tracking visa-free presence elsewhere in the region, see the Japan tax residency article for a country that has no day rule at all.

Frequently asked questions

Sources

• National Tax Service (NTS) — Individual Income Tax and Benefit Guide for Foreigners
• Korea Law Translation Center — Enforcement Decree of the Income Tax Act, Arts. 2–4 (domicile, residence, counting)
• Ministry of Economy and Finance — Korean Taxation (residency chapter)