5. Housing, family, and major expenses

Sources checked September 6, 2026. Unless stated otherwise, amounts, rates, and probabilities are illustrative assumptions. Institutional rules refer to Korea.

A larger deposit can mean lower rent. A cheaper home can mean a longer commute. Buying removes rent but introduces other obligations. Comparing one headline number hides the rest. Start with upfront cash, recurring payments, and the risk around money you expect to recover.

A refundable deposit is not rent, but it has a cost

A housing deposit is intended to return under a properly completed contract, so it differs from consumption. Borrowed deposit money has an interest cost, while your own money gives up another use. The latter applies opportunity cost to a housing decision.¹

The following invented comparison is not evidence that Korean jeonse is always better than monthly rent. Assume equal location, space, and maintenance charges; both the borrowing rate and assumed alternative return on your own funds are 4%. That alternative return is an input, not a guaranteed investment opportunity.

Within this table, A's actual annual cash outflow is KRW 3.2 million of interest. Its KRW 800,000 opportunity cost is not a bank withdrawal. The KRW 80 million principal still must be repaid. Model a delayed deposit return separately.

Add brokerage, moving, guarantee, maintenance, repair, and commuting costs, as well as the expected duration of the stay. For a purchase, separately investigate acquisition, holding, and sale costs and outstanding debt. If a scenario includes appreciation, include flat and falling prices too. The table alone cannot decide where to live.

Contract rights have an order

Under Korea's housing lease rules, a tenant's ability to assert the lease against third parties generally takes effect the day after both delivery of the home and resident registration are completed. Priority repayment requires the relevant possession and registration conditions together with a certified contract date.²

A certified date alone does not guarantee complete recovery. Priority concerns ranking ahead of later-ranking rights or other creditors, so earlier rights and recoverable proceeds also matter. These are Korean housing rules, not a description of tenancy law elsewhere.

Prepare questions before signing: Who is the counterparty? Does ownership match the register? What rights are already registered? When will the balance be paid and possession delivered? If considering a deposit return guarantee, ask the provider about eligibility and coverage. This is a list of questions, not a certification that a particular contract is safe.

A shared household needs a shared definition of costs

Before combining accounts, agree which expenses are shared: housing, food, care, support for parents, or existing debts. Equal contributions and income-proportional contributions are different choices; neither is universally fair.

If two people earn KRW 3 million and KRW 2 million monthly and shared costs are KRW 2.5 million, proportional contributions would be KRW 1.5 million and KRW 1 million. If the second income falls to KRW 1 million during leave, test the arrangement again. Evaluate a home against that changed budget as well as today's income.

Today's output is an upfront funding table, monthly cash flow comparison, and contract questions. Check whether an emergency reserve survives the move.

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Footnotes

1. Federal Reserve Bank of St. Louis, Scarcity — Explore Economics. Opportunity cost; the housing assumptions and calculations are the author's. ↩

2. Korea Ministry of Government Legislation, Easy Law, Housing Lease Protection Act. Requirements and timing under Articles 3 and 3-2; applicable to Korean housing leases. ↩