Korea tax guide
Korea Tax Filing for Foreigners With Side Income
Income Tax
Who this guide is for
- Foreign employees with side income in Korea
- Teachers doing tutoring or extra freelance work
- Foreigners with salary plus 3.3% income
- People unsure whether year-end settlement covered everything
Quick Answer
Foreign employees in Korea should review tax filing if they have side income such as tutoring, freelance work, platform payments, online work, or payments from multiple payers. Employer year-end settlement may cover salary income from one job, but it may not cover separate business, freelance, or other income. Check Hometax records, payer withholding, visa work-permission rules, and current NTS guidance before assuming no filing is needed.
Key points
- Employer year-end settlement may not cover side income.
- Side income can appear as business income, other income, salary, or another category.
- Visa permission and tax reporting are separate issues and both should be checked.
- Hometax pre-filled data should be compared with your own records.
Step-by-step explanation
Why side income changes the tax question
Many foreign employees in Korea assume their employer handled all tax through year-end settlement. That may be true for a simple salary-only situation, but side income can change the picture. Tutoring, freelance work, online projects, platform payments, private lessons, consulting, and one-off projects may not be included in your employer’s settlement.
The first question is what kind of income you received. A payment can be treated differently depending on the payer, contract, work arrangement, and reporting method. The second question is whether that income was already reported and withheld. The third question is whether you need to review global income tax filing.
Common side-income patterns
| Side income type | What to check |
|---|---|
| Private tutoring or lessons | Visa permission, payer records, income type, and whether withholding was applied |
| Freelance project work | 3.3% withholding, invoices, contracts, and Hometax reported income |
| Platform or app payments | Payer name, annual statements, withholding, and reporting schedule |
| Second salary job | Whether both employers were included in settlement or separate filing is needed |
Tax rules and visa rules are separate
Paying tax on side income does not automatically mean the work was permitted under your visa. The reverse is also true: having permission to work does not mean you can ignore tax reporting. Foreigners should check both sides before relying on side income.
This is especially important for students, teachers, and sponsored employees. If your visa limits work activity, ask official immigration sources or a qualified professional before accepting side work.
What records should you collect?
Keep records from both your main job and side income. For your main job, keep your withholding receipt and year-end settlement documents. For side income, keep contracts, invoices, payment statements, bank deposits, payer contact details, and any withholding receipts.
When you check Hometax, compare official records with your own records. If you know you earned side income but it is not visible, do not assume it is tax-free. It may be reported later, reported in another category, or missing because of payer error.
When to ask for help
Ask a tax professional if you have multiple payers, unclear income categories, overseas clients, cash payments, missing Hometax income, or visa concerns. A side-income case can be simple, but it can also affect filing, refund estimates, income certificates, and future visa paperwork.
Documents you may need
- Main-job withholding receipt
- Side-income payment statements
- Freelance invoices or contracts
- Bank deposit records
- Hometax income records
- Expense records if relevant
- Visa work-permission documents if applicable
Common mistakes
- Assuming small side income never matters
- Thinking 3.3% withholding completes final tax automatically
- Ignoring visa work-permission rules
- Filing from Hometax without checking missing payer records
- Mixing personal transfers with taxable income records
When should you ask a tax professional?
Ask a qualified tax professional if you have income from several countries, business income, unclear tax residency, treaty questions, missing documents, late filing concerns, or a visa situation that depends on tax records. This site explains general patterns only and cannot review your personal facts.
FAQ
Do I need to file tax if I have a Korean salary and side income?
You may need to review separate filing because employer year-end settlement usually focuses on salary income. The answer depends on income type, amount, withholding, and current rules.
Does 3.3% withholding mean my side income tax is finished?
No. Withholding is a prepayment or collection method, not always the final tax result. You may still need to review annual filing.
Can foreign students or visa holders do side work?
Tax reporting and immigration work permission are separate. Check visa rules with official immigration guidance before doing side work.
What if my side income is not on Hometax?
Ask the payer whether it was reported, check the income category and year, and keep your own records before filing.
Official Sources to Verify
Tax rules and filing procedures in Korea may change depending on your visa status, income type, tax residency, and the tax year. Before making a tax decision, always verify your situation with official sources or a qualified professional.