Collateral Mortgage (Geunjeodang)
It is like setting a maximum credit line on a property, reserving the highest claim a lender can collect.
Definition When lending money against a home, a lender registers a ceiling on the property title: "I get to recover up to this maximum amount first, including any future interest or late fees." Because the registered amount does not need updating every time the borrower pays down part of the loan, it is used in almost all Korean home mortgages.
Why a 'Collateral Mortgage' Instead of a Standard Mortgage?
Imagine lending $100 to a friend and holding their watch as collateral. If they pay back $30, you update the contract to $70. If they borrow another $20, you update it again to $90. That would be exhausting.
A standard mortgage attaches to an exact fixed debt, meaning any change in balance requires updating the official property registry. A collateral mortgage (known as geunjeodang in Korea), however, works like a credit line. The lender registers a generous maximum ceiling in advance. Within that limit, the actual debt can rise or fall without needing a paperwork update every time.
That is why banks in Korea almost exclusively use collateral mortgages for home loans. As borrowers make monthly principal and interest payments, the outstanding balance constantly changes in real time.
Why Does the Title Registry Show 120 Million KRW When You Borrowed 100 Million KRW?
Check a Korean property registry (the home's legal ID), and you will often see a figure 20% to 30% higher than the actual loan amount. This is called the maximum claim amount (chaegwon choego-aek).
Banks must protect themselves if a borrower falls behind on payments. Foreclosing on a home and distributing auction proceeds often takes over a year. The bank builds a buffer into the registered amount to cover ballooning overdue interest and legal costs during that delay.
To be clear, seeing 120 million KRW (approx. $90,000) on the registry does not mean the owner owes that full amount today. The homeowner only owes their actual remaining loan balance. But to everyone else, it serves as an official boundary: "We have first priority to collect up to 120 million KRW from this property."
Why Is Geunjeodang the First Thing to Check When Renting a Home in Korea?
When looking for a rental home in Korea, especially a jeonse (lump-sum deposit lease), you are always advised to inspect Section Eul (rights other than ownership) on the property registry. The collateral mortgage listed there acts as a priority queue ticket for payouts if things go wrong.
If the landlord defaults and the property is auctioned off by a court, the bank holding the mortgage takes its share first. A tenant's deposit can only be recovered from whatever cash remains after the bank is fully paid.
That is why the home's market value minus the registered maximum claim amount must comfortably exceed your deposit. Even if a landlord claims "there is barely any loan left," the debt could legally be borrowed back up to the ceiling at any time. You must always calculate risk based on the maximum claim amount on paper.
๐ค Common misconceptions
The maximum claim amount on the property registry is the actual debt the homeowner currently owes.
The maximum claim amount is simply the legal ceiling protected for the bank. If the borrower has made steady payments, the actual debt is lower. However, when assessing rental safety, you must calculate using the maximum ceiling because debt can technically increase back up to that limit.
๐งบ Where you meet it
A collateral mortgage (geunjeodang) is a legal right that sets a maximum recovery ceiling on a property in advance to accommodate fluctuating debt.