Jeonse ⇄ Monthly Rent Converter

Converts a deposit into monthly rent and back at a given conversion rate, against the statutory cap.

Converting a deposit into monthly rent is one line of arithmetic. What makes it worth a tool is the statutory ceiling under 주택임대차보호법 §7-2 (Housing Lease Protection Act, art. 7-2) — and the fact that it applies to a conversion within an existing tenancy and not to a new contract with a new tenant.

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Conversion

Direction

Reduce the deposit and turn the difference into monthly rent.

Use

The lower of the base rate + 2% and 10% a year

Current 전세 deposit (won)

3억

Deposit to keep after conversion (won)

1억

Conversion rate (%)

한국은행 base rate (%)

Default as of June 2026

Result

Amount converted

200,000,000원

2억

Deposit

100,000,000원

1억

Monthly rent

750,000원

Statutory cap on the rate

4.50%

Base rate + 2%, at most 10%

The lower of the base rate + 2% and 10% a year. For commercial premises it is the lower of 4.5 × the base rate and 12% a year, under 상가건물 임대차보호법 시행령 제5조 (Commercial Building Lease Protection Act, Enforcement Decree art. 5).

Maximum broker’s fee

Transaction

Kind of property

Deposit (won)

Monthly rent (won)

Transaction value

300,000,000원

100 million to under 600 million won

Maximum rate

3.0‰

0.3%

Maximum fee

900,000원

With VAT

990,000원

For a standard-rated business

The transaction value of a lease is the deposit plus the monthly rent × 100. Where that comes to less than 50 million won, the rent is multiplied by 70 instead.

These are ceilings. The fee actually charged is agreed between the client and the agent within them, and a 시·도 by-law can set it differently.

The conversion rate applies to the part of the deposit being returned, not to the whole deposit. Multiplying the whole deposit gives a rent about four times too high. To convert an area to 평, see the 평 ⇄ square metre converter; for the repayments on a loan, the loan repayment calculator.

How to use it

Enter the deposit and the rate
The base rate is an input rather than a constant, because 한국은행 revises it at eight scheduled meetings a year and a hardcoded value would be wrong within months. The default is dated on the page.
Read the cap and the market rate side by side
The statutory cap is the lower of a fixed annual ceiling and the base rate plus a spread. The market rate is usually well above it, and which applies depends on whether this is a conversion or a new contract.
Convert in either direction
Deposit to rent for a landlord’s proposal, rent to deposit when you are being offered a 반전세 and want to know what the reduction in deposit is really costing.

Common questions

Does the cap bind my landlord?

Only for a conversion of an existing tenancy — a renewal, or a change of terms mid-contract. A new tenancy with a new tenant is not covered, and the parties may agree any rate. Tenants quote the cap at landlords who are not bound by it, and landlords quote market rates at tenants who are protected by it.

Is the cap the same for a shop?

No. 상가건물임대차보호법 has its own conversion ceiling with a different formula — a multiple of the base rate and a different absolute cap — and it applies only within that Act’s coverage thresholds.

Where does the base rate come from?

It is a default you can change, dated on the page, and marked as unconfirmed for exactly that reason. Put in the current 한국은행 기준금리 before relying on the cap figure.

Feed it from

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