When considering a mortgage, many people come across the name "Flat 35" alongside private financial institutions' mortgages. Flat 35 is a fully fixed-rate mortgage offered through a partnership between the Japan Housing Finance Agency and private financial institutions, and it differs from private mortgages in its interest rate mechanics and screening criteria. Here we organize the characteristics of each, and how to think about choosing between them.
- Flat 35 is fully fixed-rate for the entire term; private loans offer a wider range of choices, including variable, fixed, and mixed types.
- Flat 35 is characterized by generally not requiring a guarantee fee or a joint guarantor.
- Flat 35's total repayment burden ratio standard is clear (roughly: 30% or less for annual income under ¥4 million, 35% or less for ¥4 million or more; check the Japan Housing Finance Agency for the latest standards).
- A property financed with Flat 35 must meet its own technical standards, requiring a conformity certificate.
- Enrolling in group credit life insurance is generally a condition of financing with private mortgages.
The bottom line: the difference is who bears the interest rate risk
The essential difference between Flat 35 and a private mortgage is who bears the risk of interest rate movement. With Flat 35, the repayment amount for the entire term is fixed at the time of borrowing, so the borrower doesn't bear the risk of rising rates. A private loan's variable rate, on the other hand, tends to start lower, but in exchange the borrower bears the risk of future rate increases. Rather than one being simply "better," it's important to understand this as a difference in how risk is allocated.
How Flat 35 works and its features
Flat 35 is a fully fixed-rate mortgage borrowed through a private financial institution partnered with the Japan Housing Finance Agency. It's characterized by generally not requiring a guarantee fee or joint guarantor, and there's no fee for prepayment either. Enrolling in group credit life insurance isn't mandatory — there's a mechanism where the interest rate drops by an amount equivalent to the premium if you don't enroll (though nowadays it's common to enroll).
How private mortgages work and their features
A private mortgage is offered by each financial institution under its own criteria, with a rich range of choices — variable rate, fixed rate, and mixed types that combine both. Enrolling in group credit life insurance is generally a condition of financing, and the premium is in many cases included in the interest rate. We cover the features of each interest rate type in Choosing a Mortgage Interest Rate Type (Variable, Fixed, or Mixed).
Differences in screening criteria
Flat 35 has a clearly defined total repayment burden ratio standard — roughly 30% or less for annual income under ¥4 million, and 35% or less for ¥4 million or more (check the Japan Housing Finance Agency's website for the latest standards). It's also said to be treated more flexibly than private loans regarding years of employment and employment type, making it easier to apply for right after a job change or for the self-employed. If you're worried about screening, see also Mortgage Screening: Cases That Can Be Harder to Pass, and What to Do.
Technical standards on the property side (conformity certification)
To use Flat 35, the home you're purchasing needs to meet its own technical standards (such as seismic performance and energy efficiency), and a conformity certificate from a third-party organization is required. For a pre-owned home, obtaining this certificate can sometimes require additional inspection and cost depending on the property, so it's reassuring to check with your agent or lender early.
How to think about which to choose
Flat 35 suits those who don't want to bear the risk of future rate increases and want to lock in their repayment amount to plan ahead. A private loan's variable rate or fixed-rate-period-selection type becomes an option for those who want to keep the initial repayment lower and respond flexibly while watching rate trends. Comparing multiple options while also weighing differences in screening criteria and property conditions is important.
FAQ
Is Flat 35 easier to pass screening for?
There's no blanket answer, but its total repayment burden ratio standard is clear, and it's said to be relatively flexible about years of employment and employment type as well. That said, be aware that the property itself must meet certain technical standards.
Is group credit life insurance mandatory with Flat 35?
It isn't mandatory. There's a mechanism where the interest rate drops by an amount equivalent to the premium if you don't enroll, but nowadays it's more common to enroll in the new agency group credit life insurance.
Can I use Flat 35 for a pre-owned condominium?
You can, but you'll need to obtain a conformity certificate showing the property meets its own technical standards. Whether you can obtain one, and the cost, vary by property, so it's advisable to check in advance.
Summary
Flat 35 and private mortgages differ in how they allocate interest rate risk, in screening criteria, and in property-side conditions. Weigh whether you want to lock in your future repayment amount or respond flexibly to rate trends, then compare multiple options before choosing.