Flat 35 Mortgage Rate Hits 3.21% in June, First Time Above 3% Since 2017

Japan’s Housing Finance Agency announced that the Flat 35 fixed-rate mortgage hit 3.21% in June for loans with 21 to 35-year terms and a loan-to-value ratio of 90% or less. This marks the first time the rate has exceeded 3% since the program’s current structure began in October 2017. Rising long-term interest rates drove the increase, which was the largest monthly jump on record.

Record Monthly Jump Reflects Rising Long-Term Rates

The Flat 35 minimum rate climbed 0.5 percentage points from May’s 2.71% to June’s 3.21%. This 0.5-point increase was the largest single-month jump since the program’s current structure began in 2017. The rate has risen for three consecutive months, with May at 2.71% and June 2025 at 1.89%.

What Drives Flat 35 Rates

The Flat 35 is Japan’s longest fixed-rate mortgage product, offering rates fixed for up to 35 years. The Housing Finance Agency sets rates monthly based on long-term interest rates and market conditions. Rising global interest rates have pushed Japan’s long-term rates higher, directly increasing borrowing costs for homebuyers seeking fixed-rate protection.

Impact on Borrowers and Housing Market

At 3.21%, a borrower taking a 35-year Flat 35 loan faces significantly higher monthly payments than a year ago. For example, a 100 million yen loan would cost roughly 475,000 yen monthly at the new rate, compared to 380,000 yen at June 2025’s 1.89% rate. Higher fixed rates may push some homebuyers toward variable-rate mortgages, which currently remain lower but carry refinancing risk.

What This Means for Home Buyers

The 3% threshold represents a psychological and practical barrier for Japanese homebuyers accustomed to decades of ultra-low rates. Buyers planning to purchase should lock in rates now if they prefer fixed-rate certainty. Those already holding variable-rate mortgages face potential payment increases if rates continue rising.

Final Thoughts

Flat 35 rates breaking 3% for the first time in nine years signals a structural shift in Japan’s mortgage market. Homebuyers should expect higher borrowing costs ahead as long-term rates remain elevated.

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