If a household owns only one home, has held it for 2+ years, and sells it for KRW 1.2B or less, the entire gain is tax-exempt. For regulated zones, 2 years of residency (not just ownership) is also required. Gains on the portion above KRW 1.2B are taxed.
For 1-household 1-home (with residency): 8% per year (4% holding + 4% residency) up to a maximum 80%. For multi-home and other property: 6% per year, capped at 30%. Holding period must be at least 3 years to qualify.
A preliminary return must be filed and tax paid within 2 months of the end of the month in which the property was transferred. Failure to file requires a final return in May of the following year.