Housing property tax in Korea is billed in two equal instalments, one in July and one in September. If the base tax comes to 200,000 won or less, however, the whole amount is charged in July and no September bill arrives at all. The September window runs from the 16th to the 30th, and the taxpayer is whoever held registered title on 1 June that year. Sell in August and the September bill still lands on the seller.
How the September figure is built
Four steps. Multiply the government-assessed value (gongsi gagyeok) by the fair market value ratio to get the tax base; apply the rate schedule to get the base tax; add the urban area levy and the local education tax to reach the annual charge; halve it for the September bill.
The ratio depends on ownership status. According to Korea Taxation Times, a single-home household is assessed at 43% up to 300 million won, 44% between 300 and 600 million, and 45% above that, while multiple-home owners and corporations are assessed at 60%. Two identical properties can therefore diverge at the very first step.
The standard rate schedule runs across four brackets from 0.1% to 0.4%. A single-home household holding a property assessed at 900 million won or less gets a special schedule 0.05 percentage points lower in each bracket, running 0.05% to 0.35%. As Seocho District notes, that relief is a time-limited provision. On top of the base tax, properties inside designated urban areas carry a levy of 0.14% of the tax base, and a local education tax equal to 20% of the base tax follows.
The number on the bill is not one tax. It is three strands — base tax, urban area levy and education tax — added together and then cut in half.
What 300, 500 and 800 million won actually cost in September
The sequence above, applied to three assessed values, using the single-home special rates and a 0.14% urban levy. The last row shows the same 800 million won property held by a multiple-home owner, at the 60% ratio and standard rates, for contrast.
| Case | Tax base (KRW) | Base tax (KRW) | Urban levy (KRW) | Education tax (KRW) | Annual total (KRW) | September bill (KRW) |
|---|---|---|---|---|---|---|
| 300m · single home (43%) | 129,000,000 | 99,000 | 180,600 | 19,800 | 299,400 | None (billed in July) |
| 500m · single home (44%) | 220,000,000 | 260,000 | 308,000 | 52,000 | 620,000 | 310,000 |
| 800m · single home (45%) | 360,000,000 | 630,000 | 504,000 | 126,000 | 1,260,000 | 630,000 |
| 800m · multiple homes (60%) | 480,000,000 | 1,290,000 | 672,000 | 258,000 | 2,220,000 | 1,110,000 |
Unpacking one row: a single home assessed at 500 million won has a tax base of 500m × 44% = 220 million won. The special-rate bracket covering 150 to 300 million charges 120,000 won plus 0.2% of the excess over 150 million, so 120,000 + 70,000,000 × 0.002 = 260,000 won of base tax. The urban levy is 220m × 0.14% = 308,000 won, and the education tax is 20% of 260,000, or 52,000 won. The three sum to 620,000 won; half of that, 310,000 won, is the September bill.
Two things stand out. First, the weight of the urban levy: in the 300 million won case it comes to 180,600 won against a base tax of only 99,000 won, because it is charged as a flat percentage of the tax base and receives no benefit from the reduced rate schedule. Second, ownership status moves the total more than the property does — the gap between 1.26 million and 2.22 million won on the same 800 million won assessment comes from the 45%-versus-60% ratio compounding with the loss of the special rates. Where the home count itself is ambiguous, as with an officetel or an inherited share, the way each tax defines a housing unit has to be settled before the calculation can even start.
If no September bill arrived
The usual explanation is the first row of the table. When base tax on the housing portion is 200,000 won or less, the full amount is billed in July and September produces nothing. Many single homes assessed in the 300 million won range fall into that category. Conversely, a September bill arriving after a July payment is normal, and the base tax on the two should match.
Years with a change of ownership cause the most confusion. The assessment date is a single day, 1 June, and whoever holds the property on that day owes the full year. Close on 2 June and the seller pays both instalments. Gwanak District publishes that rule alongside the burden cap: property tax plus urban levy cannot exceed 150% of the prior year's charge. In a year when assessed values jumped, a bill lower than the arithmetic suggests usually means that cap has bound.
What to check
- Whether the tax base on the bill matches assessed value × 43/44/45% — if the single-home relief was missed, it will have been computed at 60%.
- Whether an urban levy applies and whether it is 0.14% of the base. As Seocho District explains, local ordinance can set it as high as 0.23%, so it varies by district.
- Whether the July and September base tax figures are identical — a difference means the underlying assessment changed in between.
- Whether the 150% burden cap was applied, by placing last year's bill alongside this one.
- Cross-check a hand calculation against the Seoul ETAX local tax simulator.
- Missing 30 September adds a 3% surcharge — confirm autopay or a scheduled card payment before the deadline.
- For the full holding-tax picture, read it together with the comprehensive real estate tax structure that arrives in December.
