Paying Your Foreign Parent from Korea: 22% by Default, and a New Filing From 2026

What Korea takes when the money leaves

A Korean subsidiary paying a dividend, interest or a royalty to its overseas parent withholds 20% of the gross amount, plus local income tax at 10% of that tax. The all-in rate is 22%, and it applies at the moment of payment whether or not a treaty would have given a better answer.

That is the default, not the outcome. The treaty rate is usually much lower — 10% on a dividend to a qualifying US parent, 5% to a Japanese or British parent holding a quarter of the capital. But the reduced rate is a claim, and a claim has to be made with documents, in the payer’s hands, before the payment run.

Interest is the one place the flat rate breaks. Interest arising on bonds issued by a Korean company or a Korean government body is withheld at 14%, or 15.4% with local income tax. Other interest sits at the 20% rate. And there is a narrow zero: foreign-currency denominated bonds issued outside Korea by a Korean government body or a Korean company can carry no withholding at all on interest paid to a foreign corporation with no Korean permanent establishment.

That last line catches people. A payment for the use of equipment is rental income taxed at 2%, not a royalty at 20% — unless the applicable treaty classifies it as a royalty, in which case the treaty wins. The gap between 2.2% and 22% is large enough that the classification is worth settling before the first invoice, not after the first audit.

Treaty rates are not the rate until you have the paperwork

Korea has treaties with more than ninety jurisdictions, and for the countries most Korean subsidiaries are owned from, the ceilings are well below the domestic rate.

Rates as of January 2026. Where two figures appear, the lower one is conditional. For Japan, the UK, Germany and Singapore the lower dividend rate needs the parent to hold 25% or more of the capital of the Korean company; for France, 10% or more. The US test is different again: the 10% rate requires ownership of 10% or more and that no more than a quarter of the payer’s gross income for the preceding year consisted of interest and dividends.

Those conditions are the whole reason a treaty rate cannot be set once and left in the payroll or payables master. A subsidiary that was 30%-owned last year and 20%-owned after a group reorganisation has moved from 5% to 15% on its next dividend, and nothing in the accounting system will tell you.

The documents themselves are unglamorous: an application for the limited tax rate, a certificate of residence issued by the parent’s own tax authority, and evidence that the parent is the substantive owner of the income rather than a conduit. Since 2023 the substantive-ownership evidence has been a formal requirement rather than a courtesy, and where the submitted documents do not identify a substantive owner, the payer is required to withhold at the domestic rate regardless of what the treaty says.

The change that landed on 1 January 2026

Until the end of 2025, the payer’s job was to collect those documents and keep them. From 2026 the payer must file them.

Effective 1 January 2026, a withholding agent must submit the application for the reduced treaty rate, together with the supporting substantive-ownership documents received from the non-resident, to its competent district tax office. For dividends, interest and royalties the deadline is the end of February of the year following the year in which the income was paid. Payments made during 2026 are therefore due to be filed by the end of February 2027.

The personal-services deadline is the one that will break processes first, because it is monthly and it is fast. If a Korean entity pays a non-resident engineer, consultant or trainer and claims a treaty exemption on that fee, the exemption application and residence certificate have to be with the tax office by the 9th of the next month — a day before the withholding remittance itself is due. In practice that means the documents must be collected before the invoice is paid, not chased afterwards.

Failure to submit, or a misstatement in the payment statement, exposes the payer to the penalties that attach to income payment statement obligations. That is a payer penalty. The overseas parent does not feel it.

The rest of the calendar, and the refund route

Withholding is remitted with a monthly return by the 10th of the month following payment. That deadline has not changed and it is not affected by whether the treaty documents are complete — the tax is due on the 10th at whatever rate was correctly applicable given the documents held on the payment date.

If the documents arrive late, the payment does not wait. You withhold at the domestic rate, remit on time, and the parent claims the difference back. The refund window is five years from the 11th day of the month following the month in which the withholding tax was paid, which is generous, but the claim is made to a Korean district tax office by a foreign corporation that has no other dealings with it. Groups that treat the refund as a routine fallback tend to discover that a 22% withholding on a dividend has become a permanent 22% withholding on a dividend.

One structural trap is worth naming. If the recipient is located in a jurisdiction designated by the Minister of Economy and Finance, Korean-source income is withheld at the 20% domestic rate regardless of any treaty, unless prior approval for treaty benefits has been obtained from the Korean tax authority. Only Labuan is currently designated. It is a short list, but a group that has historically invoiced through a Labuan entity should know that the treaty does not travel with the invoice.

Which route the money takes out of Korea matters as much as the rate on it. A dividend, a service fee and a royalty are withheld differently, deducted differently in the Korean company, and tested differently for transfer pricing — and the cheapest headline rate is not always the cheapest answer once the corporate tax deduction is counted. Our tax and VAT compliance work covers the withholding return and the treaty filings; the classification question usually needs looking at alongside the bookkeeping treatment of the same payment.

If your Korean entity has crossed into statutory audit territory, the withholding position on intercompany payments is one of the first things an auditor tests — see the two-of-four external audit test for whether that applies to you. And if the payment in question is a management fee that also carries Korean VAT, the VAT filing cycle runs on its own calendar.

What to fix this month

The 2026 change is administrative, which is precisely why it gets missed. Nothing about the rate moved. Nothing about the remittance deadline moved. What moved is that a folder of documents in the finance manager’s drawer is now a filing obligation with a date attached, and the first of those dates falls at the end of February 2027 for everything paid this year.

Two things are worth doing before then. Reconcile every cross-border payment made since 1 January 2026 against the treaty documents actually held for it — not the rate applied, the documents held. Then check that the conditional rate you applied still matches the shareholding on the payment date. Those two checks catch nearly everything, and both are much cheaper now than in February.

Figures current as at 24 August 2026. Domestic withholding rates and the local income tax are per the Corporate Tax Act; treaty rates are as of January 2026 and the Korea–United States rates are from the convention text. This is general information about how Korean withholding rules operate, not advice on a particular payment.