Registering a Business in Korea (사업자등록)
Business registration looks like an administrative formality and is actually the point where several tax outcomes are locked in. Whether you register as an individual or a corporation, and as a general or simplified taxpayer, changes how your profit is taxed, what you can deduct, and how much bookkeeping you are committing to. Changing your mind later is possible but rarely free.
Who this affects
- Anyone starting a business or going independent in Korea
- Foreign nationals — your visa status determines whether you may run a business at all
- Freelancers deciding whether registering is worth it
- Existing sole traders considering incorporating
Register promptly — there is a statutory window
Registration is expected within a set period of starting business, and late registration carries penalties and can cost you input VAT on your early purchases. Registering before you spend meaningfully is the practical rule.
Individual and corporate are taxed on different systems
A sole trader's profit is taxed as the owner's global income at progressive personal rates. A corporation is a separate taxpayer, and money reaches you only as salary or dividend — each with its own tax consequence. Neither is universally better; it turns on profit level, reinvestment plans and risk.
General vs simplified is not just paperwork
Simplified status reduces the compliance burden but restricts input VAT recovery and limits 세금계산서 issuance, which some corporate customers require before they will contract with you. Choosing it for simplicity can cost you clients.
For foreign nationals, visa status comes first
Some statuses permit business activity, others prohibit it or require a change of status or permission first. Registering a business your visa does not allow is an immigration problem before it is a tax one.
Common questions
I'm a freelancer. Do I have to register?
Not always — some freelance work is handled purely through withholding. But registering can allow expense recognition and 세금계산서 issuance that clients require. Whether it helps depends on your income level and client base.
Individual or corporation — which should I pick?
At lower profits a sole tradership is usually simpler and cheaper overall. Incorporation tends to make sense as profits grow, when you want to retain earnings in the business, or when clients or liability considerations require it.
Can I change from simplified to general later?
Yes, and it can also happen automatically once revenue crosses the threshold. Planning the transition beats being reclassified unexpectedly mid-year.
Official sources
General information, not tax advice. Rules and thresholds change, and how they apply depends on your circumstances — confirm with a licensed professional before acting.