dividend income tax filing Many people, intoxicated by the sweet profits of dividends, are unexpectedly hit with a tax bomb. Especially with the introduction of special separate taxation for high-dividend companies starting in 2026, it has become an era where only those who know can reduce their taxes. It’s not enough to simply receive dividends. You need to accurately understand which tax system your dividend income falls under and how to report it. Failing to properly understand how to file dividend income tax can lead to paying unnecessary taxes, and even incurring penalties, so caution is advised.
Why is 20 Million Won Important for Dividend Income Tax?
When discussing dividend income tax, the number ’20 million won’ is practically a national rule. Whether your annual financial income, which combines interest and dividend income, exceeds 20 million won completely changes the direction of your tax filing. If your total annual financial income is 20 million won or less, the financial institution has already withheld taxes at the source, so you don’t need to file comprehensive income tax separately. This concludes your tax obligation.
However, the moment it exceeds 20 million won, the situation changes 180 degrees. From this point, your financial income is combined with other comprehensive income, such as earned income and business income, and becomes subject to comprehensive taxation. It’s important to remember that combining incomes can significantly increase your tax burden due to progressive tax rates. You should check your total financial income immediately.
Don’t Miss the 2026 High-Dividend Separate Taxation Special Provision!
From January 1, 2026, to December 31, 2028, a temporary ‘separate taxation for high-dividend company dividend income’ system will be implemented for three years. This policy reflects the government’s strong commitment to encourage dividends from domestic companies and resolve the so-called ‘Korea discount.’ Dividends received from high-dividend companies can be excluded from comprehensive income and applied for separate taxation.
High-dividend companies eligible for separate taxation must meet several conditions:
- Must be a company listed on KOSPI or KOSDAQ.
- Dividend income for the immediately preceding business year must not have decreased compared to 2024.
- The dividend payout ratio for the immediately preceding business year must be 40% or more, or the dividend payout ratio must be 25% or more and the dividend amount must have increased by 10% or more compared to the previous year.
Dividend income from these high-dividend companies can be separately taxed at a maximum rate of 30% (33% including local tax) even for amounts exceeding 20 million won, which is significantly lower than the existing comprehensive income tax rate (up to 45%). However, this system is not automatically applied. Taxpayers must submit a separate taxation application when filing their comprehensive income tax return to receive the benefits. Investors in high-dividend companies must verify the conditions for separate taxation.
Complex Dividend Income Tax? Here’s How to File!
If you have dividend income, especially if you are subject to comprehensive financial income taxation, you must file comprehensive income tax between May 1st and May 31st (or June 1st if it’s a public holiday) each year. Filing is primarily done through the National Tax Service Hometax (PC) or SonTax (mobile app). You should check your income and start filing on Hometax.
The filing procedure is as follows:
- Income Verification: Check all your income details on the National Tax Service Hometax. You must verify all income subject to comprehensive taxation, including dividend income, interest income, and earned income.
- Taxation Type Selection: If you have high-dividend company dividend income, choose the more advantageous method between comprehensive taxation and separate taxation. Since the tax burden varies depending on your income amount and the presence of other income, you must decide carefully.
- Prepare and Submit Return: Fill out and submit the tax return according to the instructions on Hometax or SonTax. If you choose high-dividend separate taxation, you must submit the relevant application form along with it.
- Local Income Tax Filing: After filing national tax, you must also file local income tax.
Since many users may access the system on the filing deadline, which could lead to system errors, it is advisable to complete your filing by May 20th with ample time.
Dividend Income Tax: A ‘Smart Life’ Strategy for Tax Savings Through Knowledge
Dividend income tax is not just about paying; how you manage it can significantly impact tax savings. The introduction of the high-dividend separate taxation system in 2026, in particular, is a crucial variable in tax-saving strategies.
- Actively Utilize ISA Accounts: Individual Savings Accounts (ISA) offer non-taxable or separate taxation benefits, excluding them from comprehensive financial income taxation. Transferring matured ISA funds to a pension account can also provide additional tax credit benefits, so it is recommended to utilize them actively.
- Compare High-Dividend Separate Taxation Options: You should carefully compare your comprehensive income tax rate with the high-dividend separate taxation rate and choose the more favorable option. Separate taxation can be much more advantageous, especially if you have a lot of other income, leading to a high comprehensive income tax rate.
- Consider Capital Gains Taxable Products: While capital gains from domestic-listed overseas stock funds may be taxed as dividend income and subject to comprehensive taxation, capital gains from direct overseas stock investments are subject to separate classification taxation, meaning they are not included in comprehensive financial income taxation even with a large income. To maximize after-tax returns, investments considering these taxation methods are necessary.
You should compare the tax-saving strategies that are most beneficial for you right now.
Dividends can be an important asset for a smart life, but without proper tax management, they are useless. Carefully check various tax-saving methods, including the new high-dividend separate taxation special provision applicable in 2026, and establish the optimal strategy for you. Remember that you can reduce taxes as much as you know, so manage your dividend income tax now.