Korean one-home capital gains: exemption checks and taxable gain

For Korea's ordinary one-household, one-home capital-gains exemption, start with household ownership at disposal, the holding period and the sale price. Apply the KRW 1.2 billion threshold only after checking any regulated-area residence rule, household status and exceptions such as temporary two-home ownership; then calculate the taxable portion.

Where does the exemption review begin?

Calculate the gain by subtracting acquisition cost and allowable expenses from sale proceeds. Then establish whether the whole gain, part of it or none of it enters taxation. The National Tax Service overview explains the ordinary exemption for a household holding one domestic home for at least two years, with additional rules and an exclusion for high-priced homes above KRW 1.2 billion.

Assemble acquisition and sale contracts and evidence of potentially allowable expenses, including acquisition tax, brokerage, legal expenses and qualifying capital improvements. After determining the taxable gain, check any applicable long-term holding deduction, annual basic deduction and tax rates, including interaction with other disposals in the same year.

This guide covers eligibility review and the high-value-home taxable-gain calculation. Acquisition tax and annual property tax are different taxes. Calculating the final return and payable tax requires further steps.

What does one household, one home mean?

It is not simply one house per person. Household relationships, spouse, shared livelihood and actual circumstances matter; separate registered addresses do not by themselves establish separate households. Check domestic housing interests at the disposal date. Temporary ownership of two homes, inheritance and other exceptions require their own eligibility analysis.

Holding and residence are different periods. NTS guidance identifies an additional two-year residence requirement for relevant homes acquired in an adjusted area on or after 3 August 2017. Check the acquisition date, the area's designation then, actual residence and any applicable exception. Changing an address just before selling does not establish years of actual residence.

Is the entire gain taxable above KRW 1.2 billion?

Not when the qualifying one-household, one-home high-value calculation applies. The NTS high-value-home calculation guidance allocates the gain by the fraction of sale proceeds above KRW 1.2 billion.

Suppose a qualifying home was bought for KRW 1 billion and sold for KRW 1.5 billion, with additional expenses omitted purely to simplify the example. The gain is KRW 500 million. The excess-price fraction is (1.5 billion - 1.2 billion) / 1.5 billion = 20%. The starting taxable gain is 500 million × 20% = KRW 100 million.

KRW 100 million is not the tax bill. Deductions, holding and residence periods, rates and individual circumstances still affect the final result. Co-ownership, allowable expenses and eligibility exceptions can substantially change it.

Build a useful example from your documents

First, a hypothetical home bought for KRW 800 million and sold for KRW 1.15 billion is within the ordinary price threshold if the one-household, one-home conditions are met. Two years of ownership alone is not enough where the residence rule also applies.

Second, a KRW 900 million purchase and KRW 1.3 billion sale, again ignoring extra expenses for illustration, produces a KRW 400 million gain. The high-value fraction is 100 million / 1.3 billion, giving a starting taxable gain of about KRW 30.77 million. This too is a gain allocation, not final tax.

Finally, identify expenses omitted from an initial price-only calculation. Keep contracts, transfer records, invoices, receipts and supporting renovation records. Not every repair qualifies as a capital expense. Reconstruct missing acquisition documents before committing to a sale rather than assuming they can all be recovered at filing time.

Practical insight: establish eligibility before estimating savings

Do not begin by assuming every one-home owner is exempt. First check the household, then housing interests, holding and residence, the high-value threshold and expense evidence. Above KRW 1.2 billion, the qualifying calculation changes to an excess-price ratio rather than automatically taxing all gain. A long ownership period also does not automatically produce the maximum long-term deduction; actual residence can matter.

This ordering makes unresolved conditions explicit when seeking professional advice.

Frequently asked questions

Q. Is KRW 1.2 billion still the price threshold in the cited guidance?

Yes, for the qualifying ordinary one-household, one-home exemption. Recheck legislation and NTS guidance applicable to the actual disposal date.

Q. Does exceeding the threshold erase the entire exemption?

Not in the qualifying high-value-home calculation. The excess-price proportion is applied to the gain before later calculation steps.

Q. Are two years of ownership and residence the same?

No. Ownership and actually living in the property are distinct. The additional residence condition can apply to the relevant adjusted-area acquisitions.

Q. What expenses may be relevant?

Acquisition tax, brokerage, legal costs and qualifying capital improvements can be relevant. Eligibility and evidence must be checked; routine repairs are not automatically deductible.

Q. Can a jointly owned home qualify?

Potentially, but household status, shares, acquisition dates and holding or residence conditions must be checked. Joint title alone does not settle eligibility.

Q. Is temporary two-home ownership automatically exempt?

No. Acquisition and disposal dates and the specific exception's requirements need separate assessment.

Q. What should I take to a tax adviser?

Acquisition and sale contracts, titles, address history, residence evidence, expense receipts and a complete list of housing interests.

This is general guidance on eligibility and taxable-gain allocation. Actual filing requires current law and the full individual facts.