When looking for rental properties in Japan, you will almost always come across two terms: security deposit and key money.
They may sound similar, but they are fundamentally different.
In this article, I will explain the difference in a simple way.
What is a Security Deposit?
A security deposit is money paid to the landlord at the time of move-in.
It functions as a form of collateral.
Its main purposes are:
- To cover unpaid rent
- To pay for restoration or repair costs when you move out
Typically, it is equivalent to 1–2 months’ rent, although this varies by property.
Key Point
In principle, the security deposit is settled when you move out.
After deducting unpaid rent or repair costs, the remaining balance is returned.
What is Key Money?
Key money is a non-refundable payment made to the landlord at the time of signing the lease.
Unlike a security deposit, it is not returned.
It is often around one month’s rent, although “no key money” properties have become more common in recent years.
Key Point
Key money is not a deposit—it is a customary payment unique to Japan.
Common Misunderstandings
- Will I get my full deposit back?
→ Not necessarily. Cleaning and repair costs may be deducted. - Is key money refundable?
→ No, it is not returned.
Why This Confuses Foreign Renters
In many countries, you may see terms like:
- Security Deposit (similar to Japan’s deposit)
- Key Money
However, the concept of key money is not as common as it is in Japan.
For this reason, clear explanation before signing a contract is very important.
Looking at It from a Cost Perspective
For example, if the rent is JPY 300,000 per month:
- Security deposit: 2 months
- Key money: 1 month
The initial cost would be:
JPY 300,000 × 3 = JPY 900,000
When choosing a property, it is important to consider not only the monthly rent, but also the total upfront cost.
Summary
- Security deposit = money that may be returned
- Key money = money that is not returned
Understanding this difference can significantly affect your decision when choosing a property.
I will continue to explain real estate topics from a “Real Estate & Money” perspective in a simple and practical way.
A Personal Note
When I was in my 20s, I stayed in Australia on a working holiday.
When renting an apartment, I paid a rental bond (similar to a security deposit), and it was returned with interest. At the time, I thought, “Why doesn’t Japan do the same?”
Later, I learned that this system is supported by a legal framework.
For example, under the NSW Fair Trading system:
- The bond is not held directly by the landlord or agent
- It is lodged with a government authority
- It is protected in a designated account
- In some cases, there are rules regarding interest
The key point is that it is managed as a public system—not by private parties.
In contrast, in Japan:
- The landlord holds the deposit
- There is generally no obligation to pay interest
- Legally, it serves as collateral for rent and related obligations
- In practice, it is typically non-interest-bearing
Can Interest Be Applied in Japan?
In theory, yes.
- Interest can be paid if specified in the contract
- Funds could be placed in a time deposit
However:
- There is no legal obligation
- Interest rates are extremely low
- Tax handling is required
- Liability must be clarified in case of disputes
For these reasons, it is not common practice in Japan.
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