An extension of the visa has to be applied for 30 days prior to the expiration date. However, in exceptional cases (such as unavoidable business trips etc.) the extension of the visa can be applied for prior to the 30 days if documentary proof is submitted. Generally, there are no limitations to the number of times for extension of stay. However, the maximum period for a D-8 visa extension for one time is 2 years. If the foreigner has continued his business without any illegal activities or an essential professional manpower dispatched from the overseas parent company continues to work, then the period of sojourn in Korea may be extended continuously without a limitation of its frequency.
The documents needed for extension of the visa are:

– Passport
– Alien registration
– Application form
– Certificate of employment
– Certificate of tax payment
– Certificate of having no default of tax payment
– Certificate of export report
– Processing fee KRW30,000
– Power of attorney (if proxy completes the application)
The approval for visa extension will depend on the tax payments and business results of the foreign-invested company.