Complete Guide to 종합소득세 for Freelancers in Korea (2026)
Comprehensive income tax (종합소득세) is the Korean tax system for individuals with multiple income sources beyond regular employment. If you're a freelancer, self-employed, or have significant other income, you'll need to file in May.
Key Finding
Freelancers earning over ₩20M/year must file 종합소득세 in May. Standard deduction (₩1.5M) vs itemized deduction depends on your actual expenses.
Who Must File May Comprehensive Income Tax?
You must file 종합소득세 if you have combined annual income exceeding ₩20M from sources other than salary (근로소득). This includes freelancers (개인사업자), rental income, dividends, interest, and other miscellaneous income. The filing deadline is May 31 each year.
Standard Deduction vs Itemized — Which Saves More?
The standard deduction (표준공제) is ₩1.5M for single earners. Itemized deductions (항목별공제) include actual business expenses, pension contributions, insurance premiums, and donations. If your actual expenses exceed ₩1.5M, itemized deductions will reduce your tax further. Use our calculator to compare both approaches.
How IRP/ISA Credits Reduce Your 종합소득세
Individual Retirement Pension (IRP) contributions provide a 16.5% tax credit (or 13.2% for lower incomes) on your comprehensive income tax. For example, ₩3M in IRP contributions could save you up to ₩495,000 in taxes. This is one of the most effective ways to reduce your tax liability while building retirement savings.
Related Tax Tools
Solve more of your Korea challenges with our precision-built calculators and guides.
Net Salary Calculator
Calculate take-home pay after all 2026 statutory deductions.
Income Tax Optimizer
Compare 19% Flat Rate vs Standard Scaling to minimize tax.
Foreign Income Tax Method
Determine the optimal tax filing strategy for expats.
4대보험 Calculator
Calculate NPS, Health, Employment & Industrial Accident costs.
Read the Full Guide
Complement this tool with our in-depth analysis and expert strategies.
How to File Comprehensive Income Tax in Korea (2026 Guide)
Home / Blog / May is notoriously known as "Tax Month" in South Korea. If you are an expat freelancer, business owner, or a regular employee who missed the January Year-End Settlement, ignoring the month of May could severely penalize your bank account. Honestly, not knowing this will cost you a tremendous amount of stress and potential tax audits. 📌 This article provides general information based on official data from the National Tax Service (NTS) . Tax situations vary significantly; always consult a licensed tax accountant (Semu-sa) for specific advice. This guide is based on the 2026 NTS filing guidelines: foreigners who reside in Korea for more than 183 days are subject to the same 종합소득세 (Comprehensive Income Tax) laws as locals. Here is how to navigate the Hometax → platform and survive May without incurring a massive penalty. Who Actually Needs to File in May? May 1 - May 31 The exact legal window in 2026 to file your Comprehensive Income Tax. The Comprehensive Income Tax (Global Income Tax) consolidates all streams of income you generated in the previous calendar year (2025) and taxes them together. You MUST file a return by May 31, 2026, if you fall into any of these categories: ✅ Independent Contractors & Freelancers: You receive 3.3% pre-taxed income (freelance English teachers, designers, models). ✅ Business Owners: You run a registered business or online shop in Korea. ✅ Multiple Income Streams: You are a full-time employee but also earn side-hustle money, YouTube revenue, or major rental income. ✅ Employees Who Missed the Deadline: You failed to submit proper deduction documents during the January Year-End Tax Settlement (연말정산). 3.3% Freelancer or Regular Staff? → Deciding between a freelance contract and a four-major-insurances regular position? Compare your real take-home pay and benefits in seconds. Compare Employment Types The 2026 Comprehensive Tax Rates: How Much is the Cut? Korea operates on an 8-bracket progressive tax structure. The more you earn globally and locally, the higher your tax bracket hits. Taxable Income Base (Standard) Base Tax Rate Progressive Deduction Under ₩14,000,000 6% - ₩14m ~ ₩50,000,000 15% ₩1,260,000 ₩50m ~ ₩88,000,000 24% ₩5,760,000 Over ₩1 Billion 45% (Maximum) ₩65,400,000 Keep in mind that Whatever your final national tax amount is, an additional 10% Local Income Tax gets slapped onto the final bill. So if your calculated National Income tax is ₩1,000,000, you will effectively pay ₩1,100,000. The Expat Secret: The 19% Flat Tax Rate Option This is the most realistic option in 2026 if you are a high-earning foreign professional. Under the Special Tax Treatment Control Law, a foreign worker can choose to bypass the progressive tax bracket entirely and apply a flat 19% tax rate (effectively 20.9% after local surtax) on all earned income. As of 2026, the Korean government has generously extended the grace period. You can elect this flat rate for up to 20 years from the first day you started working in Korea. However, if you choose the flat rate, you forfeit almost all other itemized deductions (like medical, credit card spending, or housing tax credits). "The general break-even point in 2026 for switching to the 19% flat rate is an annual salary of ₩120,000,000 to ₩150,000,000. Under those incomes, standard progressive rates with basic deductions are historically much cheaper." How Do I Actually File on Hometax? Filing physically at a district tax office (Semuseo - 세무서) requires massive patience and fluency in Korean bureaucracy. Fortunately, 95% of people now file online using Hometax (www.hometax.go.kr) . First, log in using a digital certificate or easy authentication (Kakao, Naver Pass, Toss). Once logged in during the month of May, the site usually defaults to a massive pop-up asking if you want to file your Comprehensive Income Tax (종합소득세 신고). Hometax Navigation Tip (The Auto-Filer) If you only have simple freelance (3.3%) income and no massive business overhead, look for the "모두채움 신고" (Pre-filled Declaration) button. The National Tax Service algorithms automatically calculate your estimated refund or tax owed based on company reports. Literally 3 clicks, and your filing is complete without needing to hire an accountant. Be sure to verify the final screen and wait for the "Receipt of Submission" (접수증). The tax refund itself usually hits your registered bank account dramatically late—expect it around the last week of June or early July . The Danger of Missing the May 31 Deadline If you miss the May 31, 2026 deadline, the Korean government levies extremely ruthless penalty charges. You will face a "Non-filing Penalty" of 20% on the tax you owe. Worst of all, every single day you are late, a "Delayed Payment Surcharge" of 0.022% per day is legally tacked on to your deficit. Furthermore, unresolved tax debts block your ability to renew your visa or get a certificate of tax clearance, effectively prohibiting you from leaving the country cleanly. Frequently Asked Questions Are E-2 Visa English teachers required to file in May? Usually, no, because most academies process Year-End Settlement in January. However, if your Hakwon categorized you illegally as an independent contractor (deducting exactly 3.3% instead of standard insurance packages), you are technically a freelancer and MUST file in May. Is my overseas dividend and rental income taxed in Korea? Yes, if you have lived in Korea for more than 5 years within the past 10-year period, your worldwide income becomes taxable in Korea. You must aggregate overseas dividends, crypto profits, and rent into your May comprehensive tax filing unless protected by a specific dual-taxation treaty with your home country. Can I use Son-tax to file? Yes, the Son-tax (손택스) mobile app handles basic comprehensive tax filings perfectly. Hometax has massively improved its mobile interface in 2026, meaning most pre-filled 3.3% freelance returns can be completed while riding the subway. Final Thoughts Bookmark this—you'll absolutely need it in May. Whether you are aiming for a massive refund from over-taxed 3.3% gigs, or bracing to pay out on a successful online venture, tackling the Comprehensive Income Tax early guarantees your visa stays clean and your wallet stays protected. Don't wait until May 30th when the Hometax servers predictably crash! ※ All information is based on 2026 tax law and NTS publications. Individual tax liability depends on your specific income composition and deductions. This is not professional tax advice. Curious About Your Net Pay? Find out exactly how much you are taking home after standard deductions. Run your raw numbers through our 2026 updated tax engine today. Open the Tax Calculator → Back to All Articles
How to File Taxes as a Freelancer in Korea (2026 Guide)
Home / Blog / May is the most stressful month of the year for independent contractors in South Korea. If you are an expat working as a freelance designer, consultant, private tutor, or gig-economy worker, you cannot rely on the simplified Year-End Tax Settlement (연말정산) that corporate employees enjoy in February. You are entirely on your own. 📌 This article covers general information based on NTS (National Tax Service) statutory data for 2026. Every freelance income situation is unique; always consult a certified tax professional (세무사) for accurate calculations. Every spring brings the same panic. This guide walks through the Hometax → filing process and cross-checks the latest 2026 simple expense ratios — ignoring the National Tax Service (NTS) messages is a mistake that triggers severe financial penalties. Or worse—they don't realize they are legally owed hundreds of thousands of Won in refunds because they never filed to claim back their over-withheld taxes. The system is called the 종합소득세 (Jonghap Sodeukse, Comprehensive Income Tax). It is mandatory, it is strictly enforced, and unless you have a high-end bilingual accountant, the burden of navigating the labyrinthine Hometax portal falls entirely on your shoulders. A common mistake is assuming that if their client deducted 3.3% from their paycheck, their taxes are "done." This is a massive, costly misunderstanding. That 3.3% is just an estimated deposit to the government. You must reconcile the actual math in May. The difference between ignoring the May filing and properly claiming your expense ratios can literally pay for a round-trip vacation. In this guide, I will break down exactly how to file your taxes as an independent contractor in 2026, how the 3.3% withholding really works, and how to verify if you owe the government money or if the government owes you. Understanding the 3.3% Withholding Tax Before we touch the filing process, you must fundamentally understand how freelance income is tracked in Korea. If you are legally freelancing (usually on an F-series visa or with special E-visa permissions), your clients do not pay you your full gross invoice. They pay you 96.7%. What is the 3.3% tax in Korea? The 3.3% tax is a mandatory withholding rate applied to independent contractors, consisting of a 3% national income tax and a 0.3% local resident tax. Your client remits this directly to the government under your name. This 3.3% is not your final tax rate. It is an *advance payment*. The Korean tax system operates on a progressive bracket framework (ranging from 6% to 45%). At the end of the year, the government calculates your total global income, applies your eligible business deductions, and determines your actual tax bracket. The Refund vs. Payment Dynamic Scenario A (The Refund): You earned 20,000,000 KRW as a freelancer. Throughout the year, clients withheld 660,000 KRW (3.3%). During the May filing, the government applies your standard expense deductions, dropping your taxable income so low that your actual tax liability is only 200,000 KRW. The government will refund you the 460,000 KRW difference. Scenario B (The Bill): You had a great year and earned 80,000,000 KRW. Clients withheld 2,640,000 KRW (3.3%). However, due to your high income pushing you into the 24% tax bracket, your actual tax liability is 9,000,000 KRW. You must pay the remaining 6,360,000 KRW out of pocket in May. The May Comprehensive Income Tax Filing Period Unlike corporate employees who finalize taxes in late January to February, independent contractors, freelancers, and business owners operate on a distinct spring timeline. Missing this window is critical. When do freelancers file taxes in Korea? Freelancers and independent contractors must file their Comprehensive Income Tax (Jonghap Sodeukse) strictly between May 1st and May 31st of every year. This filing accounts for all income earned between January 1 and December 31 of the previous calendar year. Failure to file by May 31st results in immediate penalties. The NTS imposes a 20% penalty on the unpaid tax amount for non-reporting, plus an additional daily interest charge (currently 0.022% per day) for late payment. Even if you operated at a loss and owe zero taxes, you are legally required to file a zero-return report. Ignoring the NTS is never the solution. May 31st The absolute, non-negotiable deadline for Comprehensive Income Tax submission (as of 2026). How to File: Navigating Hometax and Wetax Historically, filing required taking a half-day off work, taking a number at the local district tax office, and waiting hours to speak with a highly stressed civil servant. In 2026, the process is almost entirely digital through the National Tax Service portal. The primary platform is Hometax (www.hometax.go.kr) . To even access the site's reporting functions, you must authenticate your identity. A simple ID/Password is not enough. You will need a digital certificate—either a Joint Certificate (공동인증서), a Financial Certificate (금융인증서), or a mobile biometric pass like Toss or KakaoAuth linked to your Alien Registration Card. What is the difference between Hometax and Wetax? Hometax handles your national income tax, while Wetax handles your local district resident tax. After completing your primary return on Hometax, the system will automatically prompt you to click a button to transfer your data to Wetax to pay the final 10% local surcharge. The 2026 Digital Filing Workflow: ✅ Step 1: Auth & Login. Visit Hometax and log in using your Kakao/Naver mobile certificate. ✅ Step 2: Find the May Banner. Click the giant pop-up for "조합소득세 신고" (Comprehensive Income Tax Return). ✅ Step 3: Auto-Retrieval. Click "Retrieve My Income" (내 소득 불러오기). The system will pull all 3.3% payments your clients registered under your ARC. ✅ Step 4: Standard vs Itemized. Choose whether to accept the government's standard expense ratio (easy) or manually upload receipts via an accountant (harder, but often saves money for high earners). ✅ Step 5: Submit & Wetax. Submit the final math. If you owe, pay via virtual bank transfer. If you get a refund, enter your Korean bank account number. Finally, click the Wetax link to finalize the local tax. Understanding Expense Ratios (경비율) This is the secret algorithm that determines if you get a refund. As a freelancer, you don't receive standard employee deductions (like credit card usage or medical bills). Instead, you deduct business expenses from your gross income. But keeping every coffee receipt is tedious, so the government offers "Standard Expense Ratios" (기준경비율 / 단순경비율) based on your profession code. For example, if you are a freelance English editor (often Code 940909), the government might assign you a Simple Expense Ratio of roughly 64%. This means if you earn 10,000,000 KRW, the government automatically assumes you spent 6,400,000 KRW on "business expenses" (internet, laptop, transport) without requiring a single receipt. You are only taxed on the remaining 3,600,000 KRW profit. This incredibly generous system is why most low-to-mid income freelancers receive massive refunds in June. "My first two years freelancing here, I thought the 3.3% cut was just gone forever. When I finally logged into Hometax and filed, I received a 1.2 million KRW refund deposited straight into my Shinhan account a month later. Never skip May." However, if your freelance income exceeds roughly 24,000,000 KRW in a single year, you are abruptly kicked out of the Simple Expense Ratio category. You must use the Standard Expense Ratio, which drastically slashes your automatic deductions. At this threshold, you must start providing actual ledgers (장부) and real receipts to prove your expenses, or face a crushing tax bill. If you cross this line, it is almost always cheaper to hire a Korean tax accountant (세무사) for 150,000 to 300,000 KRW to file on your behalf. Previous Year Income Filing Type Required Do I need an Accountant? Under 24 Million KRW Simple Expense Ratio (단순경비율) No. Auto-file on Hometax via mobile. 24M to 75 Million KRW Standard Expense Ratio (기준경비율) Highly Recommended to save money. Over 75 Million KRW Double-Entry Bookkeeping (복식부기) Mandatory. Do not attempt alone. FAQ Section When do I receive my tax refund? Freelance tax refunds filed in May are typically deposited directly into your linked bank account between late June and early July. Local resident tax (Wetax) refunds usually arrive a few weeks later in a separate deposit. What if I missed filing my taxes last year? You can file a retroactive "Post-Deadline Return" (기한 후 신고) on Hometax. You will face minor late penalties, but if you were owed a refund, you can often still claim it up to 5 years retroactively. Do I get a refund if I am leaving Korea? Yes, but the May schedule remains rigid. If you permanently leave Korea in November, you must still coordinate with a trusted friend or accountant in Korea to access Hometax the following May to process your final filing. The Korean tax system is incredibly efficient and mathematically unforgiving. As an independent contractor, you cannot afford to be passive. If you actively track your income and understand the May deadlines, you'll stop leaving thousands of dollars on the table for the government to absorb. ※ All information is based on 2026 tax law and NTS publications. Individual tax liability depends on your specific income composition and deductions. This is not professional tax advice. Project Your Final Liability Now → Unsure what bracket you fall into? Punch your gross freelance income into our tax engine to see your exact bracket, baseline deductions, and projected liability. Use the Income Tax Calculator