Deposit to monthly rent conversion is the first lever most renters in Korea reach for. You find a room you like, the deposit is more than you can raise, and you ask whether you can put down less and pay more each month. The answer is usually yes, but the exchange rate is not what most guides tell you.
How the trade-off works
A Korean lease sets two numbers: a deposit held by the owner and returned at the end, and the monthly rent. Lower the deposit and the rent goes up; raise the deposit and the rent comes down. The owner is compensating for the interest the deposit would otherwise earn, which is why the exchange is tied to interest rates rather than a fixed rule of thumb.
This is the same mechanism that separates the two rental formats you will see advertised. A deposit-only lease with no monthly payment sits at one end, and a small deposit with high monthly rent sits at the other. Our guide to jeonse and wolse covers how those two formats compare.
The legal cap on deposit to monthly rent conversion
Korea caps how much rent an owner may charge when converting part of a deposit into monthly payments. Under Article 7-2 of the Housing Lease Protection Act, the rate cannot exceed whichever is lower of two figures: a ceiling set by decree, currently 10 percent a year, or the Bank of Korea base rate plus 2 percentage points.
With the base rate at 3.00 percent as of September 2026, the second figure is 5.00 percent, and that is the binding cap.
In practice that works out to roughly 4,200 won of monthly rent for every 1,000,000 won of deposit converted. So if you reduce a deposit by 5,000,000 won, the rent should rise by about 21,000 won a month, not far more.
You will still find older guides quoting 10,000 won per 1,000,000 won. That figure implies a 12 percent annual rate, which is above the legal ceiling in any conditions and well above today’s cap. If an owner or agent quotes you something close to it, it is worth asking how the number was calculated.
One limit on this rule: it governs the conversion of a deposit already agreed under a lease. A brand-new listing is priced by the market before you ever sit down, so the cap is a reference point for negotiation rather than a price you can demand.
What the market actually shows
Here is where the arithmetic and the market part ways. If conversion were the whole story, rooms with smaller deposits would carry higher rents. Across Seoul they do not.
Ziptoss analysed 45,019 registered rent contracts filed with the Ministry of Land, Infrastructure and Transport between August 2025 and July 2026. For small units, the median rent on a deposit of 5 million won or less was 600,000 won. On a deposit of 5 to 10 million won it was 760,000 won — higher, not lower.
The gap holds after matching floor area and decade of construction, so it is not explained by bigger or newer rooms. Across the market as a whole, the deposit figure tends to mark the tier of the unit rather than offset the rent. Rooms listed at a small deposit are more often older, smaller or further out, and both numbers sit lower together.
Both things are true at once. Within one unit, the trade-off is real and the cap applies. Across listings, a smaller deposit does not push you into a pricier room; it narrows the pool you are choosing from. The full district-by-district picture is in our guide to monthly rent in Seoul on a small deposit.
What this means when you negotiate
Come with a number rather than a request. If you know the cap works out near 4,200 won per 1,000,000 won, you can propose a specific swap instead of asking whether the deposit is flexible.
Expect owners to differ. Some prefer a larger deposit, some prefer steady monthly income, and with the base rate at 3.00 percent the calculation is less one-sided than it was during the low-rate years. An owner who declines is not being unreasonable; they are weighing the same interest question from the other side.
Whatever you agree, the deposit is the larger sum at risk. Our guide to protecting your rental deposit covers what to check before you transfer anything, and remember that management and utility fees are billed on top of whatever rent you settle on.
Frequently Asked Questions
Q: How much rent does 1,000,000 won of deposit replace?
About 4,200 won a month at the current cap. The legal maximum is the lower of 10 percent a year or the Bank of Korea base rate plus 2 points, which is 5.00 percent with the base rate at 3.00 percent in September 2026.
Q: Is the old 10,000 won per 1,000,000 won figure still used?
It appears in older guides, but it implies a 12 percent annual rate, above the legal ceiling. Treat any quote near that level as a number worth questioning.
Q: Can I always lower the deposit if I pay more rent?
Not always. The cap limits what an owner may charge for a conversion, but it does not oblige anyone to accept one. Owners with a preference for deposit income may decline, and that is their call.
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Sources: Housing Lease Protection Act Article 7-2 and its Enforcement Decree Article 9, via the Korean Law Information Center; Bank of Korea base rate as of September 2026; Ministry of Land, Infrastructure and Transport rent filings for Seoul units under 28 square metres, August 2025 to July 2026.