Seller financing is a deal in which the seller lends the buyer the balance the buyer cannot yet pay, transfers ownership, and registers a mortgage (geunjeodang, a maximum-limit collateral right) in the seller's own name. The crucial point: because it is a private debt between individuals, it is not directly subject to the financial regulator's loan rules (LTV, DSR).
Listings advertising "seller loan available" have been appearing across pricey Seoul districts such as Gangnam, as Financial News reported. The tighter the loan rules, the more private financing fills the space where institutional lending has become hard to obtain. This piece organizes the structure, its relation to regulation, and the risks a buyer should weigh — using public reporting and data.
The rules bind only institutional loans. A deal between individuals sits outside them — and seller financing fills that gap.
What the seller-financing structure looks like
The process generally runs like this: buyer and seller draw up and notarize a debt agreement stating interest and repayment terms, then register a mortgage naming the seller as the creditor at the same time as the ownership transfer. The geunjeodang is a collateral device grounded in Article 357 of the Civil Act; usually a bank sets it when granting a home loan, but an individual can also legally be the mortgage holder.
As a private debt between the parties, there is no single fixed form; typically the seller lends part of the balance for a set period and the buyer repays principal and interest at an agreed time. Is it illegal? According to expert views relayed by The Hankookilbo, a private loan agreement and mortgage registration are not themselves unlawful; problems arise only with a fake loan certificate or a false price declaration. The regulator's stance is that private transactions are not a separate matter for it to examine.
Why it rises for homes over KRW 2.5B — start with the cash needed
The backdrop is tightened loan rules. In regulated areas, the mortgage cap varies by home price as follows.
| Home price (regulated area) | Mortgage cap |
|---|---|
| KRW 1.5B or less | KRW 600M |
| Over KRW 1.5B to 2.5B | KRW 400M |
| Over KRW 2.5B | KRW 200M |
Apply these caps to the reported KRW 2.9B sale and the gap is clear. With only an institutional loan (max KRW 200M), the buyer needs KRW 2.7B in cash; but if the seller defers the balance with a KRW 1.77B mortgage, the cash the buyer must raise immediately drops to KRW 1.13B.
| Item | Institutional loan only | With seller financing |
|---|---|---|
| Sale price | KRW 2.9B | KRW 2.9B |
| Loan / mortgage | KRW 200M (cap) | KRW 1.77B (seller) |
| Cash needed now (calc.) | KRW 2.7B | KRW 1.13B |
As the math shows, private financing looks especially attractive on high-priced homes — like the over-KRW-2.5B band where the loan cap shrinks sharply. The order in which loan limits are set is covered in the LTV/DTI/DSR calculation order.
What "regulatory blind spot" really means
The LTV/DSR rules apply only to institutional loans. A private mortgage falls outside them, so the same borrowed amount sits beyond the regulatory formula — hence the term "blind spot." Money Today reported that seller-held mortgages in Gangnam listings rose each time loan rules tightened, and that in one ultra-prime case a seller registered a KRW 9.36B mortgage within a KRW 16.5B deal. Listings explicitly offering seller loans have also been observed — a 59㎡ unit in Jamsil at KRW 2.86B, a 59㎡ unit in Jagok-dong at KRW 2.0B (seller loan KRW 600M).
Yet "blind spot" does not mean "safe." For the buyer, the debt owed to the seller remains, and the burden shifts with the repayment timing and rate. Ownership has transferred, but a large mortgage is attached, so reading the exact rights on the registry comes first. What to check on the registry before contracting is covered in registry warning signs.
What a buyer should check
If you are reviewing a deal involving seller financing, it is safer to start with items verifiable from public information.
- Maximum claim amount vs. actual debt: the maximum claim recorded on the registry is usually set higher than the amount actually borrowed — distinguish it from the principal you must repay.
- Repayment timing and rate: confirm the maturity, interest rate and prepayment terms in the written debt agreement.
- Truthfulness of the price declaration: a false actual-price filing or fake loan certificate is where legal problems begin.
- Mortgage discharge plan: check when the mortgage is released after repayment, and whether that condition is written into the contract.
- Taxes and source of funds: private lending still leaves a money trail, so keep documentation.
Since institutional debate may continue over whether to treat private mortgages as a blind spot, it is worth watching related reporting and changes in registration practice together.