Executive summary
Construction, installation, and assembly projects get their own version of the permanent establishment test — one built entirely around how long the site stays in existence, rather than the place/fixed/business-activity analysis used elsewhere. Korean domestic law sets a flat 6-month threshold. Korea's tax treaties often set a different one, and the specific number varies significantly by country — anywhere from under six months to eighteen months, depending on the treaty.
For any foreign contractor or subcontractor running a project in Korea, getting the duration calculation right — including when the clock starts, what counts as a pause versus a stop, and how subcontractor time gets treated — determines whether the project triggers Korean comprehensive taxation at all.
Who should read this
- Foreign construction, engineering, and installation companies working in Korea
- Subcontractors on Korean project sites
- In-house tax teams tracking project timelines against treaty thresholds
- Companies bidding on Korean infrastructure, plant, or equipment installation work
The short answer
Under Korean domestic law, a construction site, or an installation/assembly project (including related supervisory work), becomes a Korean permanent establishment once it exceeds 6 months in existence.
Where a tax treaty applies, that treaty's own threshold controls instead — and treaty thresholds vary widely, generally running from around 6 months up to 18 months depending on the country, with some treaties setting separate thresholds for the construction work itself versus related supervisory activity.
The clock starts when preparatory work begins in Korea — not when the government or client formally issues a construction permit — and runs continuously through to completion or abandonment, including ordinary seasonal or other temporary pauses along the way.
Quick comparison
| Factor | Domestic law (no treaty) | Treaty countries |
|---|---|---|
| Threshold | Exceeds 6 months | Varies by treaty, generally 6–18 months |
| Supervisory activity threshold | Same as construction itself | Sometimes set separately from construction/installation work |
| When the clock starts | Start of preparatory activity in Korea (e.g., setting up a design office for the project) | Same general principle |
| Temporary pauses (seasonal, etc.) | Included in the duration count | Same general principle |
| Subcontractor time | Counted toward the main contractor's site duration | Same general principle |
Understanding the construction PE clock
When it starts
The duration that determines PE status begins the moment preparatory activity for the project starts in the country where the work is commissioned — the standard example is setting up a design office for the construction project. It doesn't start on the date of a formal permit or the date physical groundbreaking begins.
When it ends
The clock keeps running until the construction is completed or permanently abandoned. Ordinary interruptions — seasonal downtime, or other temporary causes — don't stop the clock; they're included in the total duration.
When PE status actually takes effect
This is a detail that surprises people: a construction site becomes a PE from the start of the project, not from the moment the duration threshold is crossed. If a project was genuinely expected to run past the threshold but ends up finishing early, PE status that already applied isn't retroactively cancelled.
How subcontracted work counts
Where a main contractor subcontracts part of a project to another company, the subcontractor's construction period counts toward the main contractor's total site duration. But whether the subcontractor itself has a Korean PE is judged separately, based on the subcontractor's own time on site — not the main contractor's total.
Domestic-law duration rule
Under Korea's Corporate Tax Act, a construction site existing in Korea for more than 6 months is treated as a domestic place of business. This domestic-law threshold applies by default whenever no tax treaty overrides it.
Treaty-specific duration thresholds
Korea's tax treaties frequently set their own duration threshold for construction PE status, and the specific period — along with whether construction/installation work and supervisory activity get separate thresholds — differs substantially by treaty partner. A representative sample:
| Treaty country | Construction / installation / assembly | Supervisory activity |
|---|---|---|
| Netherlands, Denmark, Mexico, Myanmar, Belgium, Sweden, Switzerland, Singapore, Indonesia, Japan, China, Chile, Canada, Turkey, Philippines, Australia, Saudi Arabia, Colombia, Peru | Exceeds 6 months | Exceeds 6 months |
| Vietnam, Norway, United States, Algeria, Pakistan, Portugal, Finland, Qatar | Exceeds 6 months | Not specified |
| Kuwait, Tunisia, Thailand | 6 months or more | 6 months or more |
| Brazil | 6 months or more | Not specified |
| Morocco | 8 months or more | Not specified |
| Greece (resource exploration: 6 months), Malta, India, Fiji, Oman, Estonia, Venezuela, Albania, Ecuador | Exceeds 9 months | Exceeds 9 months |
| Slovakia, Uruguay, Georgia, Czech Republic | Exceeds 9 months | Not specified |
| Latvia, Lithuania | 9 months or more | 9 months or more |
| Bulgaria, Egypt | 9 months or more | Not specified |
| Luxembourg | 12 months or more | 6 months or more |
| Romania, Ireland, Israel, Iran, Kazakhstan | 12 months or more | 12 months or more |
| Russia, France, Poland, Hungary, Uzbekistan, Ukraine | 12 months or more | Not specified |
| Malaysia | Exceeds 12 months | 6 months or more |
| Gabon, Germany, Azerbaijan, United Kingdom, Jordan, Turkmenistan, Hong Kong, Slovenia | Exceeds 12 months | Exceeds 12 months |
| South Africa, New Zealand, Laos, Mongolia, Bahrain, Belarus, Brunei, Serbia, Spain, Iceland, Ethiopia, Austria, Italy, Kenya, Croatia, Kyrgyzstan, Tajikistan | Exceeds 12 months | Not specified |
| Papua New Guinea | 183 days or more | 6 months or more |
| Nepal | Exceeds 183 days | Exceeds 183 days |
| Bangladesh, Sri Lanka | Exceeds 183 days | Not specified |
| United Arab Emirates | Exceeds 18 months | Exceeds 18 months |
| Panama | Exceeds 270 days | Not specified |
For any specific project, always check that treaty's actual permanent establishment article directly — this table is a starting reference, not a substitute for the treaty text itself.
Practical insight: the countdown starts earlier than people expect
Practical insight: a seasonal pause doesn't reset anything
What foreign companies often get wrong
- Starting the duration clock from groundbreaking or permit issuance instead of from the start of preparatory activity.
- Assuming a seasonal or weather-related pause stops the duration clock, when it's generally included in the total.
- Applying the 6-month domestic-law threshold to a treaty-country project without checking whether that specific treaty sets a different number.
- Assuming a subcontractor is automatically covered by (or automatically excluded from) the main contractor's PE status, rather than assessing the subcontractor's own site duration separately.
Frequently asked questions
If we expected a project to run 8 months but it finished in 4, do we still have a Korean PE?
If the project was genuinely expected to exceed the applicable threshold at the outset, PE status attaches from the start of the project and isn't cancelled just because the work finished ahead of schedule.
Does the treaty threshold or the domestic 6-month rule apply to us?
Where a tax treaty exists between Korea and your home country, the treaty's specific threshold controls, if it differs from the domestic 6-month rule. Absent a treaty, the domestic rule applies.
We're a subcontractor on a Korean project — does the main contractor's total site duration determine our PE status?
No — your own time on site determines whether you individually have a Korean PE. The main contractor's total duration is a separate calculation that happens to include your subcontracted period as part of it.
Do supervisory-only activities (without doing the actual construction) get the same threshold?
It depends on the treaty. Some treaties apply the same threshold to construction and supervisory activity; others specify no separate rule for supervisory work at all, or set no threshold, meaning the general PE rules would need to be checked instead.
Practical checklist
For any Korean construction, installation, or assembly project, confirm:
- Whether a tax treaty exists with the contracting company's home country, and what duration threshold it sets for construction PE
- The actual start date of preparatory activity in Korea, not just the physical groundbreaking date
- Whether any anticipated pauses are ordinary/seasonal (included in the duration count) or fall under a genuine unrelated-cause exception
- How subcontracted work is time-tracked, both for the main contractor's total and for each subcontractor's own separate PE assessment
- Whether the applicable treaty sets separate thresholds for construction/installation work versus supervisory activity
Key takeaways
Construction PE status in Korea turns entirely on a duration calculation — and the details of that calculation (when the clock starts, what counts as a pause, how subcontractor time flows through) matter as much as the headline number itself. Because treaty thresholds vary meaningfully by country, running the domestic 6-month rule by default on a treaty-country project is one of the more common — and avoidable — mistakes in this area.
Related guides
- What Counts as a Permanent Establishment in Korea?
- Dependent Agent vs. Independent Agent: When an Agent Creates a Permanent Establishment in Korea
- How Is a Foreign Corporation Taxed in Korea? The Corporate Tax Framework Explained