When and How to Refinance Your Mortgage in Japan 2026

When and How to Refinance Your Mortgage in Japan

If your mortgage is more than a couple of years old, you may be paying more than necessary. Refinancing — switching to a better rate, different product, or new lender — can save you thousands over the remaining term. This guide explains when refinancing makes sense and how to do it in Japan.

When Refinancing Makes Sense

Refinancing typically makes sense when market rates have dropped significantly below your current rate, your financial profile has improved (higher income, better credit score, lower LTV through property appreciation), you want to switch from variable to fixed rate (or vice versa), you want to access equity for renovations or other purposes, or you want to change your loan term.

How Refinancing Works in Japan

No prepayment penalty on variable-rate mortgages at most banks. Fixed-rate loans may carry a small penalty. Online banks (SBI Sumishin) often offer the lowest refinancing rates. The main costs are new registration tax, guarantee fees (if applicable), and judicial scrivener fees. Given Japan’s ultra-low rates, refinancing saves most when switching from an older fixed rate to current lower rates

Calculating the Break-Even Point

The break-even point is how long the monthly savings take to exceed the costs of switching. Divide total switching costs by monthly savings to get the number of months. If you plan to stay longer than the break-even point, refinancing makes financial sense. Use our mortgage calculator to model the savings.

When NOT to Refinance

Refinancing does not always make sense. If the rate difference is small and switching costs are high, you may be better staying. If you are close to paying off the mortgage, the savings period is too short. If your property has decreased in value, your LTV may be worse, potentially increasing your rate.

Next Steps

Compare current rates using our mortgage calculator, read our mortgage types guide to understand your options, or check Japan FAQs for quick answers.