Korea's 2026 Tax Reform Ties Home Sale Deduction to Residency

Here is a tax puzzle from Seoul. Two neighbors bought identical apartments twelve years ago for 800 million won each, and both sell this year for 2 billion. One pays about 19 million won in capital gains tax, local surtax included. The other pays about 81 million. And if that second owner waits until 2029 instead, the bill climbs to roughly 148 million won — nearly eight times what the neighbor paid.

Nothing distinguishes these two people except a single fact: one of them lived in the apartment for ten years, the other for two.

That gap is the work of Korea's long-term deduction for single-home households — the tax break that decides much of the bill on any high-value home sale — and it is about to get dramatically wider. On August 3, the government unveiled its 2026 tax reform plan, and buried in it is a full rewrite of that deduction. It currently rewards both owning and living. Under the plan, by 2029 it will reward living only. For anyone who owns a home in Korea but doesn't occupy it — landlords, "gap" investors who buy with a tenant's deposit already in place, and, notably, owners posted overseas — the math of selling changes completely.

One caveat up front: this is a bill, not law. Public comments run through August 20, the National Assembly takes it up in September, and the numbers may move. But as we'll see, the direction is unlikely to.

What's Changing

A single-home household that sells its home for 1.2 billion won or less generally owes no capital gains tax. Above that line, the gain attributable to the excess is taxable — and this is where the long-term deduction does its work, shaving up to 80% off the taxable gain.

Today that 80% is split down the middle. Owners earn 4% per year of ownership (capped at 40% after ten years) plus 4% per year of actual residence (same cap), provided they have lived in the home at least two years. Own without ever living there and you drop to a general rate of 2% a year, capped at 30%.

The reform dismantles this in stages. Current rules hold through 2027. In 2028, a transition year, the residency rate rises to 6% while the ownership rate falls to 2%. From 2029, ownership credit disappears altogether: 8% per year of residence, up to 80% at ten years, and nothing for years the owner didn't live there.

Even the name changes — from "long-term holding special deduction" to "long-term residency income deduction." That is not cosmetic. In tax law, a name declares whom a provision is meant to protect, and deleting "holding" from the label signals that whatever reliefs get bolted on later, the benefit is designed to flow to occupants, not owners.

There is also a cap that never existed before: the deduction itself is limited to 2 billion won in 2028, then 1 billion from 2029. At an 80% rate, the cap starts biting once the taxable portion of a gain passes 1.25 billion won — territory that long-held apartments can reach, not just trophy homes.

What doesn't change is worth noting too: the 1.2 billion won tax-free threshold stays where it is. Ordinary owner-occupiers selling below that line remain untouched by the deduction rewrite.

Multi-home owners get the same treatment in miniature: their 2%-per-year ownership deduction becomes 2% per year of residency, and owners of multiple homes in adjustment-target zones (districts the government designates for tighter tax and lending rules when prices overheat) remain shut out of the deduction entirely. The principle being installed is uniform: years you didn't live there no longer earn a discount.

Three Owners, Three Outcomes

Numbers make the stakes concrete. Assume a purchase at 800 million won, a sale at 2 billion, no other deductible costs, and the 10% local income tax included throughout.

Proposed figures follow the August 3 government plan and may change in the Assembly. Case B assumes the current 2.5 million won basic deduction; the plan's expanded deduction (below) would cut that bill further.

Case A is the reform's real target: the owner who leased the home out for a decade and moved in briefly before selling. Under current rules the two years of residence unlock the preferential track, and twelve years of ownership do most of the lifting — a 48% deduction. Under the 2029 rules, only the two years count: 16%, and the tax bill nearly doubles.

Case B is the reform's promise kept. The long-term occupier of a moderately priced home reaches the same 80% either way, sits far below the new cap, and pays not one won more.

Case C shows the ceiling at work. On a 6 billion won sale the taxable gain is 3.2 billion, and the 80% rate would produce a 2.56 billion won deduction — but from 2029 only 1 billion of it survives. Ten years of genuine residence can't stop this bill from quadrupling, because the cap targets the sheer size of the gain, not the owner's behavior.

The middle ground matters too, because that's likely where a lot of real sales sit. Take Case A's prices with five years of residence: about 57.28 million won in tax today, about 97.41 million under the 2029 rules — a jump of more than 40 million won. The shorter your residence relative to your ownership, the harder this reform lands.

Running your own numbers takes four steps. Multiply your total gain by (sale price − 1.2 billion) ÷ sale price to get the taxable portion. Multiply that by your deduction rate and subtract the result. Subtract the 2.5 million won basic deduction. Apply Korea's 6–45% progressive schedule, then add 10% for local income tax. Do it once at your current rate and once at residence-years × 8%, and you'll know your exposure.

Why Korea Keeps Choosing Residents Over Owners

If this feels sudden, it shouldn't. The deduction has been tilting toward residents for years, in a straight line.

There was a time when ownership alone earned the full 80%. The first crack came with sales from 2020, when two years of actual residence became the entry ticket to the preferential track. Sales from 2021 split the 80% into ownership and residency halves — if you owned long but lived briefly, your deduction was cut in two. The 2026 plan simply finishes the journey: residency is no longer half the test; it is the whole test.

The old ownership-based deduction had respectable logic behind it. A gain built over decades is partly inflation, and taxing all of it overreaches. Heavy exit taxes also freeze listings that markets need — the "lock-in" problem every capital gains regime wrestles with.

The plan doesn't reject those arguments so much as subordinate them to a third: the tax code's generosity should flow to people who actually live in what they own. Inflation erodes a landlord's gain as surely as an occupier's, but under the plan only the occupier gets compensated for it. The definition of a "genuine" homeowner has migrated from owning to living — and that migration is the key to reading whatever Korean property tax change comes next.

The route being closed is specific. Under ownership-based rules, an investor could buy an apartment with a tenant's jeonse deposit in place — jeonse being Korea's signature lump-sum lease, which doubles as interest-free financing for landlords — then move in just long enough to harvest the deduction. As long as ownership years earned credit, the tax code was quietly subsidizing that play.

Two details confirm the philosophy. While the deduction narrowed, the tax-free threshold rose — from 900 million to 1.2 billion won at the end of 2021 — widening the fully exempt zone for ordinary owner-occupiers. Raise the exemption line, but reserve everything above it for residents — that is the design.

And the same plan rebuilds the comprehensive real estate holding tax on identical lines: the basic exemption for an owner-occupied single home rises from 1.2 to 1.4 billion won, while the exemption for a non-occupied single home drops to 900 million. The home you live in and the home you merely own are being put on different tax tracks.

That consistency is the practical takeaway. Even if the Assembly trims a rate here or a cap there, the change is likely to be in the numbers, not the direction.

The Sale-Year Staircase

For owners in Case A's position, timing is now worth real money. Hold the facts constant and move only the sale date:

Each year of waiting adds roughly 33 million won. If a sale was coming anyway, this staircase is where the planning starts.

The opposite play also exists: move in and accumulate residency. Under the 2029 rules each year of residence is worth 8 percentage points — on Case A's numbers, about 38.4 million won of extra deduction and roughly 17 million won of tax saved per year. Whether to sell before the staircase steepens or move in and climb it is a question you can now answer with arithmetic.

Before you act, check how your residency actually counts. The years are read from resident registration and actual occupancy, and years spent in the home as a tenant before buying don't count — pull your registration history before assuming anything.

Then check the carve-outs, because the plan credits up to three years of absence for unavoidable reasons — schooling, job transfers, medical treatment, caring for parents, or a stay abroad — plus half of any redevelopment or reconstruction period. If you've been posted overseas while renting out your Seoul apartment, that provision is aimed at you; start assembling the paperwork now, because the detailed rules land in an enforcement decree next year. (If you've been away long enough to question your tax residency itself, see our guide to Korea's non-resident test — a different trap entirely.)

The plan also closes the old workarounds. The "win-win landlord" exception that waived residency for landlords who capped rent increases at 5% gets confined to sales within a year of contract termination once its sunset passes, and the surtax exemption and deduction privileges lingering on deregistered buy-to-rent apartments in adjustment-target zones (existing homes a registered landlord bought and leased out, deregistered automatically once the mandatory lease period ended) are being phased out. The doors to resident treatment without residing are shutting one by one.

The Sweeteners — and the Screws

Reading this plan as a pure tax increase misses half of it. Several reliefs travel in the same residency-first direction.

The headline sweetener is a tenfold expansion of the basic deduction: for a single home occupied ten years or more and sold for 3 billion won or less, it jumps from 2.5 million to 25 million won. Long-term occupiers like Case B keep their full rate and stack this on top — a clear statement of where the plan wants the benefits to land.

Seniors get a relocation break too. A single-home owner 65 or older who sells a capital-region home and moves outside it gets 50% of the tax forgiven (up to 500 million won) on a 2027 sale, and 30% (up to 300 million) in 2028. The relief shrinks by the year, so for those eligible, earlier is better.

A third device protects older owners who stay put: the payment deferral system, which postpones holding tax until a home is sold or inherited, sees its income ceiling rise by 10 million won, and for single-home owners 65 or older with ten years of residence the income test disappears once holding tax reaches 10% of income. The point is to keep long-settled retirees from being taxed out of their own homes.

Elsewhere the screws tighten. Temporary two-home status in adjustment-target zones — the arrangement that preserves single-home treatment if you buy a new home at least a year after your current one and sell the old one within a set window — is being pared back: the window shrinks from three years to two. If a move-up purchase is in your plans, your financing schedule just lost a year of slack.

The philosophy extends beyond housing. The surtax on non-business land — land held without genuine business or residential use — doubles from 10 to 20 percentage points over base rates, and the corporate equivalent rises from 10% to 20%. Assets you own but don't use are getting more expensive to profit from, across the board.

On the holding-tax side, the carrying cost of non-occupancy rises on a schedule: the fair market value ratio (the share of appraised value that enters the tax base) climbs from 60% to 70% for single-home owners in 2027, and the year-over-year cap on holding tax growth moves from 150% to 200% of the prior year's bill. For the mechanics, see our comprehensive real estate tax analysis. The multi-home capital gains surtax, by contrast, is eased for 2027–2028 — best read as a window meant to coax inventory onto the market; the framework is in our capital gains exemption explainer.

Landlords Are Already Moving Back In

Within days of the announcement, the market's first response ran against the government's script. Press reports describe a stream of inquiries from single-home landlords in Gangnam asking about reclaiming their properties — the rational move when both holding-tax and exit-tax penalties on non-occupancy grow at once.

The numbers moved fast. By Munhwa Ilbo's count, jeonse listings in Gangnam's Daechi-dong fell 18.2% in a month, and half of the twenty Seoul neighborhoods with the steepest drops were in the three Gangnam districts. Agents described buyers and sellers alike holding back, with transactions effectively stalled.

The people caught in the middle are tenants. Every owner move-in removes a rental from supply. Ham Young-jin, head of real estate research at Woori Bank, said housing insecurity for tenants and shrinking jeonse supply are unavoidable once protection periods lapse; Park Hoon, professor of taxation at the University of Seoul, argued that thinner listings could strengthen landlords' bargaining power. Others have argued that public rental supply should be expanded alongside the reform.

There is a counterview: the impact on core districts, at least, may prove limited. Which reading wins depends on the final legislation and where the market stands when it takes effect.

But the asymmetry in timing is hard to argue with. Rental supply can contract at every lease expiry, starting now; the plan's device for adding sale listings — the temporary surtax relief for multi-home owners — must pass through each owner's decision to sell. In the short run, the rental market is likely to feel the pressure first.

If you rent, the practical takeaway is narrow but real: know when your one-time renewal right (a tenant's statutory option to extend the lease by two years) can be exercised, and don't let the window pass unexamined.

What to Do Before the Law Settles

The bill's path from here is worth knowing, because it is not a spectator sport. Public comments run through August 20, and anyone can file through the government's legislation portal or the finance ministry; for reforms this contested, filings often become ammunition in the bargaining that follows. The Assembly then takes the bill into its fall session, with tax legislation customarily settled alongside the year-end budget.

Separate what can change from what likely won't. Rate schedules, cap amounts, effective dates — numbers like these have been adjusted in the Assembly before. The residency-first direction has been reinforced across successive administrations, and a reversal now looks unlikely.

Even passage isn't the end. The rules that decide real outcomes — which absences count as residence, what documents prove them — arrive by enforcement decree early next year. For Case A owners and overseas absentees especially, that decree is the second gate.

For buyers, the checklist just changed. Whether you will actually live in a home now splits its entire tax trajectory — holding tax and exit tax both. A buyer who moves in keeps the rate structure's protection, though the deduction cap applies regardless of residency, so at the very top of the market even occupiers pay more, as Case C shows. If the plan passes, "will I live there?" becomes the first question of the financing plan.

For owners, three actions are worth taking this month. Pull your resident registration history and compute your deduction under both current and proposed rules. If a sale is on your horizon, run the staircase with your own numbers — on Case A's figures, the 2027-versus-2029 gap is about 66 million won. And if schooling, a transfer, or an overseas posting kept you out of your home, start collecting the paper trail now. When the law settles, the difference between the owner who moves that day and the owner who starts calculating that day is, as Case A shows, measured in tens of millions of won.