2026 Korea Income Tax Filing: Who Must File and How Freelancers Can Check Refunds

2026 Korea income tax filing refers to Korea’s comprehensive income tax return for income earned in 2025. It matters not only to business owners, but also to freelancers, side-income workers, delivery riders, creators, and employees who earned money outside regular payroll income.

For international readers, the key point is simple: in Korea, a freelancer who had 3.3% tax withheld from payments may still need to file a final comprehensive income tax return. The withheld amount is not always the final tax. It may lead to a refund, no additional payment, or an extra tax bill depending on income, expenses, and deductions.

2026 Korea income tax filing: quick answer

2026 Korea income tax filing usually takes place in May 2026 and covers income earned in 2025. Taxpayers should verify the official deadline with Korea’s National Tax Service because May 31, 2026 falls on a Sunday, which may move the practical deadline to the next business day.

• Filing year: 2026
• Income year: 2025
• Main platform: Korea’s HomeTax system
• Who should check: freelancers, side-income workers, platform workers, creators, and people with non-wage income
• Extra step: local income tax should also be filed separately

Who may need 2026 Korea income tax filing?

A salaried employee who only had wage income and completed year-end tax settlement through an employer usually may not need to file separately. However, filing may be necessary if the person had income beyond regular wages.

• Freelancers paid after 3.3% withholding
• Side-income workers with business or miscellaneous income
• Delivery riders and platform workers
• Creators earning from YouTube, blogs, affiliate marketing, or ads
• People with lecture fees, writing fees, consulting fees, or outsourcing income
• Individuals with rental income or certain financial income
• Employees with income from multiple employers that was not fully settled
• Workers who missed deductions during year-end settlement and want to correct them

Why freelancers should check refunds in 2026 Korea income tax filing

For freelancers in Korea, 3.3% is often withheld before payment. During comprehensive income tax filing, the final tax liability is calculated again by comparing income, recognized expenses, deductions, and prepaid tax.

Three outcomes are possible. The withheld tax may be higher than the final tax, creating a refund. It may roughly match the final tax. Or the final tax may be higher, creating an additional payment. This is why freelancers should not ignore the filing process even if they already paid tax through withholding.

Pre-filled returns are helpful but should be reviewed

Korea’s National Tax Service provides simplified pre-filled filing for many taxpayers. It can make filing easier, especially for simple cases. However, a pre-filled return is a convenience tool, not a guarantee that the filing is complete or optimal.

• Check whether all income sources are included.
• Review whether business expenses are missing.
• Confirm deduction items.
• Check whether platform income from multiple sources is fully included.
• Make sure the refund bank account is accurate.

How to file through HomeTax, mobile app, or ARS

Most taxpayers can file through Korea’s HomeTax website. Some may use the mobile app commonly known as SonTax. Certain pre-filled return users may also be eligible for simplified ARS filing depending on the notice from the National Tax Service.

1. Log in to HomeTax.
2. Select comprehensive income tax filing.
3. Check the filing type.
4. Review income and withholding records.
5. Add or correct expenses and deductions.
6. Confirm refund or payment amount.
7. Submit the return.
8. Complete local income tax filing as well.

Penalty risks in 2026 Korea income tax filing

If a taxpayer is required to file but misses the deadline, penalties may apply. Risks can include a non-filing penalty, underreporting penalty, late payment penalty, delayed refund, or a correction request from the tax office.

Overstating expenses or omitting income can also create later tax adjustments. For AdSense, creator, and affiliate income, taxpayers should compare platform records with actual bank deposits before filing.

Local income tax should not be missed

One common mistake is assuming that national comprehensive income tax completes the entire process. In Korea, local income tax is also filed and paid separately. After submitting the national return through HomeTax, taxpayers are usually guided to the local income tax process, which may connect to Wetax.

Official sources to check

• National Tax Service: https://www.nts.go.kr
• HomeTax: https://www.hometax.go.kr
• Wetax: https://www.wetax.go.kr
• Government24: https://www.gov.kr

FAQ

What is 2026 Korea income tax filing?

It is the comprehensive income tax return for income earned in 2025, usually filed in May 2026.

Do freelancers need to file even if 3.3% was withheld?

They may need to. The 3.3% withholding is not always the final tax. The final liability is recalculated during filing.

Can freelancers get a refund?

Yes. If the tax already withheld is higher than the final calculated tax, a refund may occur.

Is HomeTax enough to complete everything?

HomeTax is used for national comprehensive income tax, but local income tax must also be filed and paid separately.

This article is for general information only and does not replace personalized tax advice. Filing requirements, expense recognition, and refund results depend on each taxpayer’s income structure and records.