Key facts at a glance
- ✓Freelancers in Korea pay progressive income tax from 6% to 45% depending on annual income
- ✓You must register a business (사업자등록) with the National Tax Service within 20 days of starting freelance work
- ✓VAT returns are filed quarterly (January and July), and income tax is filed annually in May
- ✓The flat 19% tax rate option is available to foreign workers (including freelancers) through 2026
- ✓Failure to file can result in penalty surcharges of 20% or more on unpaid taxes
Overview
Freelancing in South Korea as a foreigner is legal, but the tax system requires careful attention. Whether you are teaching English privately, doing consulting work, running an online business, or offering design and development services, the Korean National Tax Service (NTS) expects you to register, report your income, and pay taxes. The rules apply equally to Korean citizens and foreign residents.
Korea uses a self-assessment system for freelancers. This means you are responsible for calculating your own tax liability, filing your returns on time, and paying the correct amount. Unlike salaried employees whose employers handle tax withholding, freelancers must manage everything themselves (or hire an accountant to do it).
The good news is that Korea offers a special flat tax rate of 19% for eligible foreign workers. This can be significantly lower than the progressive rates for higher earners. However, choosing the flat rate means you cannot claim deductions or credits, so the best option depends on your income level and expenses.
6%
Base tax rate
45%
Top tax rate
19%
Flat rate option
10%
VAT rate
Source: National Tax Service (nts.go.kr), 2026
Income tax rates for freelancers
Korea applies a progressive income tax system with eight brackets. Your taxable income (after deductions) determines which rates apply. Local income tax of 10% of your national income tax is added on top.
2026 income tax brackets (annual taxable income)
Flat 19% tax option for foreigners: Foreign residents can elect a flat 19% income tax rate (plus 1.9% local income tax) instead of the progressive rates. This option has been extended through December 31, 2026. If you choose the flat rate, you cannot claim any deductions, exemptions, or tax credits. This benefits higher earners, but freelancers with lower income and significant deductions may pay less under the progressive system.
In addition to income tax, freelancers must also charge and remit 10% VAT (value-added tax) on most services. If your annual revenue is under 80 million KRW, you qualify as a simplified VAT taxpayer with a reduced rate. Certain services (such as education and medical services) are VAT-exempt.
Effective tax comparison: progressive vs. flat rate (annual income)
Source: Progressive rates (before deductions) vs. flat 19% — flat rate benefits those earning above ~70M KRW
Registering as self-employed
Before you can legally freelance and issue invoices (tax invoices, or 세금계산서) in Korea, you must register a business with the National Tax Service. This is called 사업자등록 (sa-eop-ja deung-rok). You are required to register within 20 days of starting your business activity.
Visa requirement: Your visa must permit self-employment or freelance work. The most common visa types that allow freelancing include the D-10 (job-seeking, with permission), E-7 (professional employment), F-2 (long-term residency), F-4 (overseas Korean), F-5 (permanent residency), and F-6 (marriage). Teaching English privately on an E-2 visa without proper authorization is illegal and can result in deportation. Check with immigration (immigration.go.kr) if you are unsure about your visa status.
Visit your local tax office (세무서)
Find the tax office in your district. You can locate it on the NTS website (nts.go.kr). Bring your passport, ARC (Alien Registration Card), and a copy of your lease or proof of business address. Some freelancers use their home address.
Fill out the business registration form
Complete the 사업자등록 신청서 (Business Registration Application). You will need to select your business type and industry code. For most freelancers, this is a sole proprietorship (개인사업자). Staff at the tax office can help you choose the correct code.
Submit and receive your business number
Processing typically takes 1 to 3 business days. You will receive a 사업자등록증 (Business Registration Certificate) with your 10-digit business registration number. This number is used on all invoices and tax filings.
Set up your tax invoice system
Register for HomeTax (hometax.go.kr), the NTS online portal, to issue electronic tax invoices (전자세금계산서). You will use HomeTax for filing VAT returns and income tax. An authorized certificate (공동인증서) from your bank is needed to log in.
Quarterly tax filing schedule
Freelancers in Korea have two main filing obligations: VAT returns (twice per year) and annual income tax (once per year in May). Missing these deadlines triggers automatic penalty surcharges.
Key filing deadlines
VAT filing is done through HomeTax (hometax.go.kr). You report all sales invoices you issued and all purchase invoices you received. The difference between VAT you collected and VAT you paid on business expenses is the amount you owe (or receive as a refund).
For annual income tax filing in May, you report all income earned during the previous calendar year. This includes freelance income, interest, dividends, rental income, and any other taxable income. You can file online through HomeTax or through a tax accountant.
Simplified taxpayer benefit: If your annual revenue is under 80 million KRW, you qualify as a simplified taxpayer (간이과세자). This means a lower VAT rate (1.5% to 4% of revenue depending on your industry, instead of the standard 10%), simpler bookkeeping requirements, and you only need to file VAT once per year in January.
Deductions and expenses
If you choose the progressive tax system (not the flat 19% rate), you can deduct legitimate business expenses to reduce your taxable income. Proper documentation is essential. Keep all receipts and invoices for at least 5 years.
Common deductible expenses
Korea also offers a standard deduction method called the "estimated expense rate" (기준경비율 or 단순경비율). Instead of tracking every receipt, you can deduct a fixed percentage of your revenue as estimated expenses. The rate varies by industry. For many freelance service providers, this is between 40% and 65% of revenue. This is simpler but may result in a higher tax bill if your actual expenses are greater than the estimated rate.
Important for the flat 19% rate: If you elect the flat 19% tax rate for foreigners, you cannot claim any of these deductions. You pay 19% on your gross income with no reductions. Run the numbers both ways before deciding. Many freelancers earning under 50 million KRW per year pay less under the progressive system with deductions.
Hiring a tax accountant
While it is possible to handle your taxes alone, most freelancing foreigners in Korea hire a tax accountant (세무사, se-mu-sa). The Korean tax system is complex, and the NTS website and HomeTax portal are primarily in Korean. A qualified accountant will save you time, reduce errors, and often find deductions you would miss.
What a tax accountant handles
- ✓Business registration and setup
- ✓Quarterly VAT filing (January and July)
- ✓Annual income tax filing (May)
- ✓Flat rate vs. progressive rate analysis
- ✓Expense tracking and deduction optimization
- ✓Responding to NTS inquiries or audits
Typical fees for a tax accountant handling a solo freelancer range from 100,000 to 300,000 KRW per month for bookkeeping and filing services. One-time annual filing assistance costs 200,000 to 500,000 KRW. These fees are themselves tax-deductible as a business expense.
To find an English-speaking tax accountant, check expat community groups on Facebook and Reddit (r/korea, r/Living_in_Korea). Many accounting firms in Gangnam, Itaewon, and Hongdae areas cater to foreign clients. Ask for referrals from other freelancers in your network. You can also search the Korean Certified Tax Accountant Association (tax.or.kr) directory, though the site is primarily in Korean.
Penalties for non-filing
The Korean NTS takes tax compliance seriously, and penalties for non-filing or late filing are substantial. Foreigners are not exempt from these penalties. In severe cases, unpaid taxes can affect your visa renewal or re-entry to Korea.
Late filing penalty
20% of the unpaid tax amount if you file after the deadline. This applies to both VAT and income tax returns. If the NTS determines you intentionally underreported income, the penalty increases to 40%.
Late payment penalty
0.022% per day on the unpaid amount, calculated from the original due date until full payment. This adds up quickly. For example, 10 million KRW unpaid for 6 months results in roughly 400,000 KRW in interest penalties alone.
No business registration penalty
1% of your total revenue for the period you operated without a business registration. If the NTS discovers you were freelancing without registration, this penalty is applied retroactively.
Invoice violations
Failing to issue proper tax invoices results in a penalty of 2% of the transaction amount. Issuing false invoices carries even heavier penalties.
Visa implications
Outstanding tax debts can flag your immigration record. This may cause problems when renewing your visa or applying for permanent residency (F-5). Immigration authorities can access NTS records.
Do not ignore NTS notices: If you receive a letter or notification from the NTS, respond promptly. Ignoring NTS correspondence can escalate your case to a formal audit. The NTS has data-sharing agreements with banks, credit card companies, and other government agencies. They can and do cross-reference income data automatically.
Frequently asked questions
Can I freelance in Korea on a tourist visa?
Do I need to pay Korean taxes if I freelance for clients outside Korea?
Should I choose the flat 19% rate or the progressive rate?
What happens if I leave Korea with unpaid taxes?
Can I use an app to track freelance income in Korea?
Do I need to pay national pension and health insurance as a freelancer?
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