2026 Comprehensive Real Estate Tax: How Much Will You Pay?

Mr. A, who owns a single apartment in Daechi-dong, Gangnam, is projected to see his property tax bill jump 50%—from 12 million won this year to 18 million won next year. Publicly assessed values are surging from 2.9 billion won to 3.8 billion won, and the fair market value ratio (the multiplier applied to assessed values to determine the tax base) is rising as well, creating a double squeeze on tax burdens. With the number of Comprehensive Real Estate Tax (CRET) payers reaching 630,000 in 2025 and tax revenue hitting 5.3 trillion won—both up year-over-year—2026 may mark a genuine turning point for property holding taxes in South Korea.

How is the Comprehensive Real Estate Tax Calculated?

Understanding the Comprehensive Real Estate Tax requires grasping three key variables: publicly assessed values, the fair market value ratio, and the tax rate.

First, publicly assessed values are the official property prices determined by the Ministry of Land, Infrastructure and Transport as of January 1 each year. These differ from actual transaction prices and are set below market values through what is known as the "realization rate." The realization rate for 2026 is expected to remain at 69%.

Multiplying the assessed value by the fair market value ratio produces the tax base. Under Article 7 of the Comprehensive Real Estate Tax Act, the current fair market value ratio stands at 60%. Even with the same assessed value, a higher ratio means a larger tax base—and a bigger tax bill.

Finally, there are the tax rates. Under Article 8 of the Act, progressive rates of 0.5% to 2.7% apply to owners of two or fewer properties. Single-home households receive a deduction of 1.2 billion won from their combined assessed values, while others receive a standard deduction of 900 million won. Article 9 also provides senior citizen tax credits (20–40% for those aged 60 and above) and long-term holding credits (20–50% for holdings of five years or more), which can combine for a maximum reduction of up to 80%.

Surging Assessed Values: Gangnam Faces 20–40% Increases

The first driver behind the sharp rise in 2026 property taxes is the steep increase in publicly assessed values. According to Economy Chosun, assessed values for residential properties in the three Gangnam districts and the Han River belt are estimated to rise 20–40% year-over-year in 2026.

Consider a specific example. For the Sunkyung Apartment in Daechi-dong, Gangnam-gu (127.75㎡ exclusive area), the current market price is approximately 5.5 billion won, while the 2025 assessed value was 2.939 billion won. In 2026, this is projected to rise to approximately 3.795 billion won—a roughly 29% increase. That represents an assessed value jump of more than 850 million won.

The backdrop to these surges is that while home prices in key Seoul neighborhoods have risen substantially over the past two to three years, the realization rate has been frozen at 69% for four consecutive years, widening the gap between market prices and assessed values. According to Home Economy News, even with the realization rate frozen, assessed values automatically rise when market prices increase, making property tax and CRET hikes unavoidable in 2026.

The impact, of course, varies significantly by region. Areas with concentrations of high-value housing like Gangnam, Seocho, and Songpa will bear the brunt, but homeowners with assessed values below 900 million won are not subject to CRET and will see limited effects.

Fair Market Value Ratio: From 45% to 60%, and Potentially 80%?

The second variable amplifying property tax burdens is the fair market value ratio. This ratio is particularly significant because it can be adjusted by presidential decree without parliamentary legislation, meaning it can change rapidly depending on the government's policy direction.

Looking at the trajectory: the ratio climbed to 90% during 2020–2022, then was temporarily reduced to 45% during the real estate market downturn of 2023–2024. It returned to the statutory level of 60% starting in 2025. But that may not be the end of it. The government is reportedly considering raising it to as high as 80%, citing the need to shore up local government finances and restore tax equity.

If the fair market value ratio rises from 60% to 80%, the tax base increases by 33% even with no change in assessed values. Combined with surging assessed values, this creates a compounding burden. Analysts project that property holding tax burdens for homeowners in areas where prices have risen sharply—such as Gangnam and the Han River belt—could increase 30–50% year-over-year.

CRET Simulations by Owner Type

Let's examine how actual tax bills change when the fair market value ratio shifts from 45% to 60%, broken down by owner type.

For a single-home owner with an assessed value of 1.2 billion won, applying the 1.2 billion won deduction leaves virtually no tax base, resulting in minimal CRET. However, if the fair market value ratio rises to 80% and assessed values also increase, the situation changes. What was approximately 250,000 won in CRET could rise to 600,000 won—an increase of 350,000 won.

For a two-property owner (assessed values of 900 million + 1.1 billion won, totaling 2 billion won), the situation is more severe. After applying the 900 million won standard deduction, the remaining 1.1 billion won is multiplied by the 60% fair market value ratio, producing a tax base of 660 million won. The resulting CRET is approximately 2.5 million won—up 1.3 million won from the 1.2 million won under the previous 45% ratio.

For an elderly owner of a single high-value property (assessed value 1.3 billion won, age 65), senior citizen credits (30%) and long-term holding credits can significantly reduce the tax burden. However, since the pre-credit tax amount itself grows with the higher fair market value ratio, the bill increases from approximately 400,000 won to 1 million won—a jump of about 600,000 won.

The key takeaway from these simulations is that multi-property owners bear the greatest impact from fair market value ratio increases. Single-home owners can offset much of the burden through the 1.2 billion won deduction and senior/long-term holding credits, but multi-property owners have far fewer such buffers.

The CRET Abolition Debate: Where Does the Discussion Stand?

Political discussions surrounding the 2026 CRET can be broadly divided into three camps.

First, there is the movement to abolish CRET for single-home owners. People Power Party lawmaker Ahn Cheol-soo has publicly argued that "CRET on owner-occupied single-home households is not taxation but punishment." The criticism has gained momentum following a Yonhap News report about a vice principal who was hit with 13 million won in CRET after operating a free dormitory for financially disadvantaged university students, fueling public backlash against the "punitive nature" of the tax.

Second, there is a proposal to trade property holding tax reductions for reinstating capital gains tax surcharges. During 2026 economic growth strategy discussions, the idea has been floated to lower holding taxes while reinstating capital gains tax surcharges to capture revenue at the transaction stage. For multi-property owners, this would mean a shift to "lower taxes while you hold, higher taxes when you sell."

Third, there are proponents of strengthening property taxes by raising the fair market value ratio to 80%. This camp argues it is necessary to expand local government revenue and curb real estate speculation. This approach is the most feasible from the government's perspective, as it requires only an amendment to the enforcement decree rather than parliamentary legislation.

This simultaneous discussion of easing and tightening can generate significant market confusion. Newsis reports that even the 1.2 billion won threshold for tax-free single-home capital gains is being questioned as having a "weak basis," with calls for revision emerging—leaving the entire real estate tax framework in flux.

Practical Strategies for Reducing CRET Burden

The key to CRET tax savings lies in accurately understanding the assessment date and the deduction system.

First, the assessment date is June 1 each year. Since CRET is determined based on properties held on that date, disposing of a property before June 1 can be advantageous if the timing of a sale can be adjusted.

Second, joint ownership between spouses allows deductions of 900 million won each, for a total of 1.8 billion won. This is 600 million won more than the 1.2 billion won deduction for sole ownership. However, joint ownership makes the senior citizen and long-term holding credits inapplicable, so it is essential to run simulations based on individual circumstances to determine which option is more favorable.

Third, it is worth exploring whether registering as a rental business operator or utilizing the aggregation exclusion system could apply. Rental properties meeting certain requirements can be excluded from CRET aggregation, making it important for multi-property owners to consult with professional tax advisors to design an optimal strategy.

Market experts suggest that 2026 could represent a "tax golden time" for multi-property owners. With property holding taxes rising and discussions of reinstating capital gains tax surcharges underway, now is the time to consider restructuring asset portfolios.

Outlook and Implications

The 2026 property tax environment presents a complex picture, with both surging assessed values and changing fair market value ratios moving simultaneously. Property holding taxes in high-value housing clusters such as Gangnam are likely to increase 30–50% year-over-year, and if the fair market value ratio climbs to 80%, the shock could be even greater.

At the same time, political discussions ranging from CRET abolition to a holding tax/capital gains tax swap are proceeding on multiple fronts, leaving the final direction of the tax framework uncertain. What is clear is that the property holding tax burden has exited the temporary relief period of 2023–2024 and is back on an upward trajectory.

For taxpayers holding real estate, it is essential to check changes to their property's assessed value when figures are released in March–April and to actively utilize the objection filing system. Additionally, monitoring developments around potential further increases to the fair market value ratio and capital gains tax surcharge legislation will be critical for determining the optimal timing for holding, selling, or gifting assets.