Interest rate and repayment FAQ
Questions on base and preferential rates, variable-rate rules, and repayment methods.
This hub answers questions about how rates are set, how they change, and how repayment works.
Key points
- Direct answers to common questions, each linking to a detailed guide.
- Answers reflect the higher-rate 2026 environment and verified sources.
- Use the linked guides and calculators for the full decision.
- Educational only — confirm material decisions with the relevant professional.
About this FAQ hub
This hub answers questions about how rates are set, how they change, and how repayment works. It gathers 20 of the most common questions on this topic — questions on base and preferential rates, variable-rate rules, and repayment methods — each with a short, direct answer and a link to the guide that covers it in full.
The answers reflect Japan’s higher-rate 2026 environment rather than the near-zero conditions of earlier years: the Bank of Japan’s operating guideline was around 1.0% in mid-2026, and several lenders pre-announced further increases, so the answers assume rates can rise. Advertised rates are execution-month or example figures verified in 2026, not guaranteed offers, and only final underwriting and execution determine your actual rate.
How to use these answers
Treat each answer as a starting point rather than a verdict. It summarises the general rule, but your own situation — residence status, income type, the specific property, and the lender — determines the outcome, and mortgage approval is both borrower-specific and property-specific. Follow the linked guides for the full decision, use the calculators to model your own numbers, and confirm anything material with the lender, a licensed real-estate broker, a judicial scrivener, or a tax accountant.
For any mortgage question, obtain a dated written quotation rather than relying on a headline rate or a comparison ranking: pricing changes monthly, discounts can depend on conditions you must maintain, and referral economics can influence which products a ranking features. Where a figure is not disclosed on a lender’s page — the effective all-fee cost, the real minimum income, or non-permanent-resident eligibility — treat it as requiring a direct quotation, not something to infer.
Who this is for
- Anyone with quick questions on this topic
- Buyers and borrowers doing initial research
What this is not
- A substitute for professional advice
- These are educational summaries; confirm material decisions with the lender, broker, or a licensed professional.
Frequently asked questions
What is a base rate?
The lender’s reference rate before any discount.
What is a preferential rate?
The base rate minus an approved discount margin.
Can the discount margin disappear?
It can under certain contract conditions. Confirm whether the discount margin is permanent for the term.
What is a fixed rate?
A rate fixed for a defined period or the entire loan.
What is a variable rate?
A rate that can change under the loan’s review rules, commonly reviewed twice a year.
How often can variable rates change?
Commonly twice yearly, but contracts differ — read the agreement.
What is the five-year rule?
A payment-review convention used by some loans that recalculates the payment only every five years. It is not a rate cap.
What is the 125% rule?
A convention limiting a payment increase to 125% at review. It does not eliminate accrued interest.
Do all variable mortgages use the five-year/125% rules?
No. Some lenders do not use them — check the actual agreement.
Can unpaid interest occur?
Yes, under some payment-limiting structures, when interest exceeds the scheduled payment it can accumulate as unpaid interest.
Are variable rates risky?
Yes, especially when affordability depends on the starting rate. Choose variable only if you survive a 2–3 point rise without selling.
What happens if rates rise?
Interest cost rises; the timing of the payment change depends on the contract’s reset and payment rules.
Is a fixed rate risk-free?
No. It removes specified interest-rate risk, not income, property, inflation, or life risk.
What is a fixed-period mortgage?
A loan fixed for an initial period (e.g. 10 years) and repriced afterward at the then-current rate.
What happens after the fixed period?
The then-current rate and contractual discount apply, which can be much higher than the initial rate.
What is a mixed mortgage?
Borrowing split between variable and fixed rate types.
Does mixing reduce risk?
It reduces concentration in one rate type but does not guarantee the lowest cost.
What is amortization?
The scheduled reduction of principal through payments; early payments on a level-payment loan are mostly interest.
What is level principal-and-interest repayment?
A structure aiming for a level scheduled payment, subject to rate resets; total interest is higher than level principal.
What is level-principal repayment?
Equal principal each month with declining total payments; it saves total interest but starts higher, and not every lender offers it.