What Is the Financial Investment Income Tax? A Complete Guide to 2026 Tax Rates, Eligibility, and Filing Methods

The Financial Investment Income Tax is levied at a 20% rate when annual financial income exceeds 50 million won. Including local income tax, the effective tax rate is 22%. This article provides a step-by-step guide on who is subject to the tax, how much you need to pay, and how to file.

What Is the Financial Investment Income Tax? A Complete Guide to 2026 Tax Rates, Eligibility, and Filing Methods

1. Eligibility and Threshold Amounts

The Financial Investment Income Tax is based on the total of all income generated from financial activities, including interest, dividends, and capital gains. If the aggregated amount for the year exceeds 50 million won, tax is applied to the excess portion. For example, if you earn 20 million won in interest, 20 million won in dividends, and 20 million won in stock capital gains, totaling 60 million won, tax is calculated only on the 10 million won exceeding the threshold. The exact criteria can be verified annually in the notices issued by the Ministry of Economy and Finance.

💡 Key Point
20% tax rate applied to amounts exceeding 50 million won

2. Tax Rate Calculation and Real-World Examples

The taxable base is the total financial investment income minus 50 million won. Multiplying this by 20% yields the calculated tax amount. Adding 2% local income tax to this figure determines the final tax payable. For instance, if the taxable base is 10 million won, the tax is 10 million won × 20% = 2 million won. Adding 40,000 won in local income tax results in a total payment of 2.04 million won. If tax credits or reductions apply, they are deducted from this amount.

💡 Key Point
Taxable Base × 20% + 2% Local Income Tax = Total Tax Payable

3. Eligible Accounts and Products for Tax Savings

Individual Savings Accounts (ISA) and Individual Retirement Pensions (IRP) are either excluded from the scope of the Financial Investment Income Tax or eligible for separate taxation benefits. ISA accounts offer tax-free treatment or a low 9% separate tax rate on annual contributions up to 20 million won, while IRPs allow for tax credits on annual contributions up to 7 million won. Pension savings funds also qualify for tax credits on contributions, helping to reduce the effective tax burden. These products must be opened through financial institutions, and relevant documents must be submitted during year-end tax settlement.

💡 Key Point
Reduce taxable income using ISA, IRP, and pension savings

4. Filing and Payment Methods, and Key Considerations

The Financial Investment Income Tax is filed concurrently with the comprehensive income tax return. On the HomeTax portal, select the financial investment income section and enter your transaction details; the tax amount will be calculated automatically. The filing period runs from May 1 to May 31 of the following year, and late filings are subject to surcharges. It is crucial to manage income from tax-exempt accounts such as ISA and IRP separately to avoid double taxation on the same income. For precise details, refer to the announcements on the National Tax Service website.

💡 Key Point
File with comprehensive income tax return; strictly adhere to deadlines

Frequently Asked Questions

When is the Financial Investment Income Tax not applied?

If the total annual financial income is 50 million won or less, it is excluded from taxation. Income generated from ISA or IRP accounts is subject to separate tax-exempt or low-rate taxation rules and is not aggregated with comprehensive income.

What are specific ways to reduce the tax amount?

Contributing up to 20 million won annually to an ISA account qualifies for tax-free treatment or a 9% low-rate separate tax benefit. Contributing up to 7 million won annually to an IRP earns a tax credit, and pension savings funds are also eligible for tax credits.

What are the penalties for missing the filing deadline?

Late filings are subject to surcharges for non-filing and late payment. Since surcharges are calculated as a certain percentage of the tax amount, it is important to meet the filing deadline whenever possible.