Key Money (보증금) Explained: A Foreigner's Guide to Korean Rental Deposits

Your relocation packet says the deposit will be ₩30 million. That's about $22,000 USD, parked with someone you've never met, for at least two years. In a country where you don't yet have a bank account, an ARC, or a Korean credit history.

Welcome to 보증금 — key money — the single most foreign concept on a Korean rental listing. It's not a mistake, not a security deposit gone wild, and not a scam. It's the load-bearing financial mechanism of how Korean rental actually works, and understanding it is the difference between signing confidently and signing nervously.

This guide walks through what 보증금 actually is, why it's so large, where the money goes during your lease, and — the part that matters most — how you get it back at the end.

A note from us: HavenLens lists rentals with the deposit structure shown transparently on every card, and we walk foreign tenants through the deposit return process at end-of-lease. That's the angle we work from. Same guide we'd give a friend regardless.

What 보증금 actually is

In a Korean rental contract, 보증금 (boseunggeum, literally "guarantee money") is a lump-sum cash payment from the tenant to the landlord at the start of the lease. It is held by the landlord, not in escrow, for the duration of the lease. When the lease ends, the landlord returns it.

You'll hear it translated several ways:

• Key money — the most common English term in Korea
• Deposit — the most common Western analogue
• Boseunggeum or 보증금 — the actual Korean word

All three refer to the same thing. We'll use "deposit" and "보증금" interchangeably.

What it is not: it is not a security deposit in the Western sense. A Western security deposit (typically one to two months of rent) covers landlord costs if you damage the property or skip rent. A Korean 보증금 is much larger — often multiples of monthly rent or years of it — and serves a structural function in the lease itself, not just a damage-coverage function.

This distinction matters because it explains why the deposit is so much larger than what you'd expect.

Why deposits in Korea are so large

The full historical answer is in our Jeonse vs. Wolse guide, but the short version:

Through the 1980s and 1990s, Korea had unusually high savings interest rates — often above 10 percent annually. A landlord who collected a large deposit could park it in a bank account and earn enough interest to substitute for monthly rent. The tenant got reduced monthly rent (or no rent at all, under jeonse). The landlord got an interest-bearing chunk of capital to work with. Both sides benefited.

This system became cultural infrastructure. Even as interest rates dropped, the deposit structure stuck. Today, deposits remain large because:

• Landlords use them as cash reserves or partial down payments on their next property. Korean landlords often hold rental property as an investment, financed partly by tenant deposits.
• They lower monthly rent. A larger deposit at signing means lower monthly cash flow needed from the tenant, which works for both sides.
• They serve as a landlord credit check on the tenant. A tenant with ₩30 million in cash for deposit signals stability.
• They reduce eviction risk for the landlord. A tenant with ₩30 million tied up is less likely to skip payment.

The net effect: even the smallest wolse rental in Seoul typically has a deposit of ₩5 million or more. Mid-range wolse in Gangnam runs ₩20–80 million. Banjeonse and jeonse rentals start at ₩100 million and go up from there.

How much you typically pay

Rough ranges by property type and rental system, in Seoul as of early 2026:

Outside Seoul, deposits run lower — sometimes 50 to 70 percent of these figures in regional cities. Within Seoul, Gangnam pulls the high end of the range; Yongsan and northern districts sit in the middle.

For more detail on why two similar listings can have very different deposits, see our guide on Why Korean Apartment Deposits Vary.

Where the money goes during your lease

This is the part that worries most foreign tenants, and reasonably so: ₩30 million is sitting somewhere, you don't have it, and you can't see it.

In a normal lease, the deposit goes into the landlord's personal or business bank account. There is no escrow, no third-party custodian, no government holding agency. The landlord has full discretion over what they do with the money. In most cases:

• Some sits in savings, earning interest as a financial reserve.
• Some is used for personal cash flow — paying their own mortgage on the property, funding a renovation, or financing day-to-day life.
• Some is reinvested into other property purchases, businesses, or investments.

Your deposit is, functionally, an interest-free loan from you to the landlord for the duration of the lease. The landlord owes it back at lease end, but is under no obligation to keep it segregated or untouched.

This is normal in Korea. It is also the structural reason deposits sometimes don't come back smoothly — if the landlord has used the deposit to fund their own life and doesn't have replacement cash on lease-end day, return becomes a problem. We'll cover what to do about that below.

How you get the deposit back

The standard return mechanic works like this:

1. Notify the landlord of your intent to leave, typically one to three months before lease end. The exact notice period is in your lease contract (계약서).
2. The landlord finds a new tenant to replace you. The new tenant's deposit replaces yours.
3. On move-out day, you hand over the keys, the landlord inspects the property, and they wire your deposit (minus any agreed deductions for damage or unpaid utilities) to your bank account.

In a well-functioning rental, this is fast — same-day wire is standard.

In practice, things slow down when:

• The landlord can't find a new tenant before your move-out date. Korean rentals often have a "vacant gap" where the landlord doesn't have replacement deposit cash yet. By Korean custom (not law), they may ask for a delay — sometimes a few days, sometimes a few weeks — until the new tenant signs.
• The landlord has spent or invested the deposit money and needs time to liquidate.
• The landlord disputes deductions for damage or maintenance.
• The landlord is in financial trouble — overleveraged, foreclosure risk, or insolvent.

The first two are routine. The third is normal contract dispute. The fourth is what every protective filing is designed to guard against.

When return goes wrong — and how to protect yourself

The single biggest practical risk for any Korean tenant — foreigner or otherwise — is that the landlord can't or won't return the deposit at lease end. Four protective layers exist.

Layer 1: 확정일자 and 전입신고 — your priority claim

Within a few days of moving in, file two short administrative steps at the local district office (주민센터, or the immigration office for foreigners):

• 확정일자 (certified date): a date stamp on your lease contract. Gives your deposit priority over any future mortgages or claims registered against the property after the stamp date.
• 전입신고 (residence registration): registering your address. Establishes your legal occupancy.

Together, these put you in line ahead of new creditors. If the landlord defaults on a mortgage after you sign, your deposit is senior to that mortgage's claim on the property.

These are free or near-free. Do them on day one of move-in. Not day three.

Layer 2: 등기부등본 — verify the property before you sign

Before signing the lease, get a copy of the property registry (등기부등본). It's available from any district office or online at iros.go.kr for a few thousand won.

Check three things:

• The landlord's name matches the person you're signing with.
• No senior mortgages registered before your contract — or if there are, the combined senior debt plus your deposit is comfortably below 70 percent of the property's market value.
• No outstanding tax liens, court judgments, or other encumbrances on the property.

If any of these are off, walk away or negotiate aggressively. Most reputable Korean realtors will help you read the registry; if yours won't, find a different realtor.

Layer 3: HUG deposit insurance (전세보증보험)

For deposits above roughly ₩100 million, deposit insurance from the Korea Housing & Urban Guarantee Corporation (HUG) is the most important safety net. If the landlord can't return your deposit at lease end, HUG pays you and pursues the landlord.

Eligibility:

• Property must meet HUG's appraisal criteria.
• Deposit must be under the regional cap (roughly ₩500 million in Seoul as of 2026, higher for jeonse on apartments).
• Landlord must not be on HUG's blacklist of previously-defaulted landlords.

Premiums run 0.1 to 0.3 percent of the deposit per year, paid by the tenant. For a ₩200 million deposit, that's ₩200,000 to ₩600,000 per year — the cheapest insurance you will buy in Korea.

Layer 4: contractual safeguards

In the lease itself, you can negotiate clauses that improve your position:

• Deposit return penalty clause (보증금 반환 지연 손해배상): a daily late fee the landlord owes if return is delayed past move-out day. Standard rate is the legal interest rate (~5% annually divided by 365), but you can negotiate higher.
• Right of first refusal on a new tenant: if you find a replacement tenant before move-out, the landlord must accept them.
• Move-out date flexibility: some leases require move-out on a fixed day. Negotiating a ±2-week window helps if the landlord is slow finding a replacement.

These are negotiable, especially when the landlord is eager to rent. The standard 임대차계약서 boilerplate doesn't include them — they go in the 특약사항 (special clauses) section.

See our Foreigner's Korean Lease Checklist for the full pre-signing playbook.

A note on terminology — "key money" in Korea vs elsewhere

In Korea, "key money" is the standard English translation of 보증금 — the refundable lump-sum deposit. This is different from how "key money" is used in some other markets (e.g., in commercial leases in some Western countries, "key money" can mean a non-refundable upfront fee paid for the right to occupy). In Korea, key money is refundable. Always.

If a Korean real estate listing uses "key money," they mean the deposit you get back at lease end. If a landlord ever tells you key money is non-refundable in a residential rental, walk away — that is not the standard Korean structure.

TL;DR

1. 보증금 (key money) is a refundable lump-sum deposit paid to the landlord at lease start and returned at lease end.
2. It's large because it historically substituted for monthly rent and now serves as landlord cash reserve, tenant credit check, and eviction insurance.
3. Where it goes during your lease: into the landlord's personal account. There is no escrow. This is normal in Korea.
4. You get it back at lease end — usually the same day as move-out, sometimes delayed by a few weeks if the landlord is finding a replacement tenant.
5. Protect yourself with four layers: 확정일자 + 전입신고 (priority filings), 등기부등본 (registry check before signing), HUG insurance (for large deposits), and contractual clauses (penalty + flexibility).

Common questions

What is key money in Korea? Key money (보증금) is a refundable cash deposit paid to the landlord at the start of a Korean rental lease. It is held by the landlord during the lease and returned at the end, typically on move-out day. It is not a non-refundable fee.

How much is key money in Korea? Ranges from ₩5–30 million for a small wolse one-room to over ₩1 billion for large jeonse apartments. A typical wolse deposit in Seoul is ₩10–50 million; a typical jeonse deposit on a two-room apartment is ₩300–500 million.

Is key money refundable? Yes. The standard Korean lease structure makes 보증금 fully refundable at lease end, minus any agreed deductions for damage or unpaid bills. If a landlord tells you key money is non-refundable, that is not the standard Korean structure.

Can foreigners get their key money back? Yes — same process as Korean tenants. The protective filings (확정일자, 전입신고) and HUG insurance also apply to foreign tenants, with somewhat stricter documentation requirements.

What happens if the landlord won't return the deposit? Three paths: (1) the protective filings put you in line ahead of new creditors in foreclosure; (2) HUG insurance pays out if you have it; (3) you can sue in district court — Korean courts generally side with tenants who have filed 확정일자 and 전입신고 properly. Most disputes resolve without court action.

Where does my deposit go during the lease? Into the landlord's personal or business bank account. There is no escrow or government holding agency in Korea. The landlord uses the money for personal cash flow, investments, or savings. This is normal — the protective filings exist to address the risks that flow from it.

Where to go next

• The three rental systems your deposit fits into: Jeonse vs. Wolse.
• Why deposits vary so much between similar listings: Why Korean Apartment Deposits Vary.
• Before you sign anything: The Foreigner's Korean Lease Checklist.
• How rent and deposit fit into total monthly cost: Cost of Living in Seoul for Expats.

If you'd like to look at listings where the deposit is laid out transparently on the card and the realtor walks you through 등기부등본 and HUG insurance in English, the HavenLens search page is the starting point.