D-8-1 extension documents include proof of personal tax payment or VAT tax base certification documents, business performance proof (export/import records, etc.) and proof the business site exists (office lease, photos of the premises, workspace and signboard). Even if salary is paid by an overseas head office, it is subject to Class B earned income tax unless a tax treaty provides otherwise, so those who joined a Class B tax association submit the Class B earned income withholding receipt, and those who did not and filed and paid comprehensive income tax submit an income certificate issued by the tax office with jurisdiction over their address.
Key Summary
- D-8-1 extension: personal tax payment proof or VAT tax base certification, business performance proof, proof the business site exists
- D-8-2 and D-8-4(S) extensions include a tax certificate and business performance proof
- Salary paid by an overseas head office is subject to Class B earned income tax unless a tax treaty provides otherwise
- Class B tax association members: Class B earned income withholding receipt; non-members who filed and paid comprehensive income tax: income certificate
1. Why do tax documents matter at D-8 extension?
At D-8-1 and D-8-3 extension, proof of personal tax payment or VAT tax base certification is among the basic documents and is used to confirm the business is real and taxes are paid.
2. What are the D-8-1 extension documents?
Application, passport and alien registration card, photo, business registration copy, corporate registry copy, original shareholder change statement, foreign-invested enterprise registration copy, proof of investment funds brought in, personal tax payment proof or VAT tax base certification, business performance proof (export/import records, etc.), proof the business site exists, proof of residence, etc. Individual investors under 300 million won add capital-use proof.
3. And the other D-8 sub-statuses?
D-8-2 extension documents include business performance proof and a tax certificate; D-8-4(S) includes business operation proof and a tax certificate.
4. What if salary comes from an overseas head office?
Even if a foreigner works at a domestic business and is paid by a head office abroad, the salary is subject to Class B earned income tax unless a tax treaty provides otherwise. The manual gives this standard in the context of collecting an individual tax payment certificate at extensions for D-9 and similar holders, so check with the competent office how it is applied to a D-8 application.
5. Which certificate do I submit?
- Joined a Class B tax association, withheld monthly and settled at year-end: the Class B earned income withholding receipt
- Did not join and filed and paid comprehensive income tax: the income certificate issued by the tax office with jurisdiction over your address
- For Class B income the payer is not in Korea, so the worker performs the tax obligation personally, filing comprehensive income tax in May of the following year if not in an association
6. Common problems
- Receiving overseas head office salary but missing the comprehensive income tax filing
- VAT tax base certificate and corporate performance records covering mismatched years
- Site photos or lease that no longer match the current state
7. How A-One Certified Administrative Agent can help
We review how to organize the tax, performance and site documents for extension and how to prove tax payment on overseas salary. We do not file tax returns on your behalf (tax accountant work is separate). No result can be promised, and we do not handle litigation or court representation (outside the scope of an administrative scrivener).
Official Basis
"Personal tax payment proof or VAT tax base certification documents / business performance (export/import records, etc.) proof / proof the business site exists (office lease, photos of premises, workspace and signboard)" — Residence Manual by Status, Corporate Investment (D-8), extension for those who invested in a corporation (D-8-1), basic documents (summarized from the Korean original)
"Even when a foreigner performs work at a domestic business and is paid by a head office abroad, the salary is subject to Class B earned income tax unless the tax treaty with that country provides otherwise" — same manual, collection of individual tax payment certificates at extension for D-9 and similar holders
Basis: Ministry of Justice Residence Manual by Status (as of September 2026). Immigration offices decide each case and may request additional documents; no outcome can be promised.
Frequently Asked Questions
Do I need a tax certificate at D-8 extension?
D-8-1 includes personal tax payment proof or VAT tax base certification documents; D-8-2 and D-8-4(S) include a tax certificate.
How is overseas head office salary taxed?
Unless a tax treaty provides otherwise it is subject to Class B earned income tax, and the worker performs the tax obligation.
What if I did not join a Class B tax association?
You file and pay comprehensive income tax in May of the following year and submit the income certificate issued by the tax office with jurisdiction over your address.
How do I prove the business site exists?
With the office lease and photos of the premises, workspace and signboard.
What proves business performance?
A business performance certificate such as export/import records.
Related Guides
Consultation
에이원 행정사사무소 (A-One Certified Administrative Agent) is an administrative office that supports document preparation and filing with the authorities. Fees vary by case and are explained during a consultation. Phone 02-309-3107 · Contact: https://investkorea.co.kr/en/contact