What determines your Korean tax refund amount

Your Korean tax refund depends on how much you overpaid during the year, which is calculated by comparing your total tax withheld against your actual tax liability. The refund itself is not a fixed amount—it's the difference between what your employer or the tax office took from your paychecks and what you actually owed based on your income, deductions, and credits. If you paid more than you owed, you get the difference back. If you paid less, you owe the remainder.

The National Tax Service (국세청, NTS) calculates this during the annual settlement process, which runs from May 1 to June 30 each year for most salaried workers. The amount varies widely depending on your income level, number of dependents, medical expenses, education costs, and whether you may have access to for any tax credits. Someone with one dependent and significant medical expenses might receive several hundred thousand won, while a single person with no deductions might receive nothing or owe money.

Foreigners working in Korea follow the same refund rules as Korean citizens, though the process and timing may differ slightly depending on visa status and whether you've filed a departure tax return.

Key Takeaways

  • Your refund amount equals the difference between taxes withheld from your paychecks and your actual tax liability for the year.
  • The annual settlement period runs May 1 to June 30, and the NTS calculates refunds based on your income, dependents, and deductions.
  • Dependents, medical expenses, education costs, and insurance premiums all reduce your tax liability and increase your potential refund.
  • Refunds typically arrive within two to four weeks of approval, either to your registered bank account or through your employer.
  • You can estimate your refund using the NTS website calculator before the settlement period begins.

How dependents and deductions affect your refund

Dependents are the single largest factor in most Korean tax refunds. Each dependent—spouse, child, parent, or grandparent living with you—reduces your taxable income. The dependent deduction amount varies by year but typically ranges from 1.5 million to 1.8 million won per person. If you have two dependents, you're reducing your taxable income by roughly 3 to 3.6 million won, which translates directly into a larger refund.

Beyond dependents, several categories of spending reduce what you owe. Medical expenses above 3 percent of your total income are deductible—this includes doctor visits, hospital stays, dental work, and prescription costs. Education expenses for yourself or dependents count toward a credit. Insurance premiums (health, long-term care, unemployment) are deductible. Charitable donations to registered organizations reduce your taxable income. Each of these lowers your final tax bill and increases your refund if you've been overpaying.

The order matters: the NTS applies deductions in a specific sequence, and some deductions have caps or phase-out thresholds. A person earning 40 million won with a spouse, two children, and 5 million won in medical expenses will see a much larger refund than someone earning the same amount with no dependents and no deductions.

Tax brackets and withholding rates in Korea

Korea uses a progressive tax system with six income tax brackets. The rates range from 6 percent on the lowest income to 45 percent on income above 500 million won. Most salaried workers fall into the 6 to 24 percent brackets. Your employer withholds tax based on your monthly salary and the number of dependents you've declared on your withholding form (근로소득세 원천징수).

The withholding calculation assumes you'll earn the same amount every month for the full year. If you received a bonus, changed jobs, took unpaid leave, or had irregular income, your employer may have withheld too much or too little. This mismatch is why the annual settlement exists—to correct the year's withholding and calculate what you actually owe based on your real annual income and circumstances.

If you updated your dependent status mid-year but your employer didn't adjust withholding when ready, you'll likely overpay and receive a refund. Similarly, if you started a job in June, your employer withheld for only seven months, but your annual tax liability is calculated on seven months of income—usually resulting in a small refund or balance due.

Estimating your refund before settlement

The NTS website offers a tax calculation tool (홈택스) where you can enter your income, dependents, and deductions to estimate your refund before the official settlement period. This tool uses the current year's tax rates and brackets, so the estimate is reasonably accurate. You'll need your employment income statement (원천징수영수증) from your employer, which shows your gross income and total tax withheld.

To use the calculator, log in to Hometax (www.hometax.go.kr) with your Korean ID number or foreign registration number, navigate to the settlement section, and enter your information. The system will show you an estimated refund or amount due. This estimate helps you plan—if you're expecting a large refund, you know to budget for it; if you owe money, you can prepare to pay during the settlement period.

Keep in mind that the estimate is only as accurate as the information you enter. If you forgot to include medical expenses or a dependent, the estimate will be too low. If you're claiming deductions for the first time, gather receipts and documentation before settlement opens, so you can file with complete information.

When and how you receive your refund

Once you file your settlement return and the NTS approves it, the refund is processed within two to four weeks. For salaried workers who file through their employer, the refund typically goes directly to the bank account you registered with the NTS. For self-employed people or those filing independently, you can choose to receive the refund by bank transfer or have it applied to any taxes you owe in future years.

Some employers process refunds through payroll and deposit them into your salary account. Others send the refund directly from the NTS to your registered bank account. Check with your HR department to confirm which method applies to you. If you've changed banks since registering with the NTS, update your account information before filing, or your refund may be delayed.

If you don't receive your refund within four weeks of filing, contact the NTS directly or visit your local tax office. Delays can occur if your bank account information is incorrect, if there's a discrepancy in your filing, or if the office is processing a high volume of returns. The NTS can confirm the status of your refund and correct any errors.

Refunds for foreigners and departing residents

Foreigners on work visas (E-1, F-2, etc.) who earned income in Korea are subject to the same tax withholding and settlement rules as Korean citizens. You file your annual settlement return the same way—either through your employer or independently at the NTS. Your refund is calculated identically and deposited to your Korean bank account.

If you're leaving Korea, you must file a departure tax return (출국세 신고) before you leave. This return settles any taxes owed or refunds due based on your income through your departure date. If you're owed a refund, the NTS will process it, but you must provide a foreign bank account or arrange for the refund to be sent to a contact address outside Korea. Some people choose to have the refund held and collected on a future visit, though this is not may provide.

The departure return must be filed at the tax office that handles your residence address, and you'll need your passport, employment contract, and income documentation. Processing can take longer than a standard settlement return because the NTS must verify your departure status. File this return at least two weeks before you leave Korea to avoid complications.

Common reasons your refund might be smaller than expected

If you calculated an estimate but your actual refund is smaller, several things could explain the difference. You may have forgotten to include all dependents or deductions in your estimate. Medical expenses must exceed 3 percent of your income to be deductible, so if your total medical costs fell short of that threshold, they don't reduce your tax. Education expenses have annual caps per dependent, so claiming more than the limit won't increase your refund.

Changes in income also affect refunds. If you received a bonus you didn't anticipate, your tax liability increased, reducing your refund. If you took unpaid leave or changed jobs, your actual income may have been lower than your estimate, which could increase your refund instead. Some deductions phase out at higher income levels—for example, the dependent deduction reduces for very high earners—so your actual refund calculation may differ from a straightforward estimate.

Finally, if you owe back taxes, unpaid fines, or have outstanding debts to the government, the NTS may offset your refund against those amounts. You won't receive cash; instead, the refund is applied to what you owe. The NTS will notify you if this happens.

Frequently Asked Questions

Can I get a refund if I didn't file a settlement return?

No. The NTS only processes refunds for people who file a settlement return during the May 1 to June 30 window. If you don't file, any overpayment stays with the government. Salaried workers whose employers file on their behalf are covered automatically. Self-employed people and those with side income must file independently or forfeit the refund.

What if my employer didn't withhold enough tax?

You'll owe the difference during settlement. The NTS will calculate how much you owe based on your actual annual income and deductions. You can pay this amount in full or request a payment plan if the amount is large. Failing to pay can result in penalties and interest charges.

How do I know if my refund was approved?

Log into Hometax and check your settlement status. Once approved, the status changes to "완료" (completed). You can also call the NTS or visit your local tax office to confirm. Most refunds arrive within two to four weeks of approval.

Can I claim deductions for expenses I paid in cash without receipts?

No. The NTS requires documentation for all deductions—receipts, invoices, or official statements from the provider. Medical expenses must come from registered hospitals or clinics. Education expenses need school documentation. Without proof, the deduction will be rejected and your refund reduced.

What happens if I file my settlement return late?

You can still file after June 30, but you'll face a late-filing penalty of 10 percent of the unpaid tax (if you owe money). If you're owed a refund, filing late doesn't reduce the amount, but you'll receive it later. It's best to file during the official window to avoid penalties.