Hong Kong Mortgage Calculator
Enter the loan amount, annual interest rate and tenor to calculate the monthly repayment, and estimate the minimum income required under the HKMA stress test (rate +2%, debt servicing ratio ≤ 50%).
輸入資料
計算結果
重點速覽：Hong Kong mortgages use equal monthly instalments: monthly repayment M = P·r·(1+r)^n / ((1+r)^n −1), where P is the loan amount, r is the monthly interest rate (annual rate/12) and n is the total number of months. The HKMA stress test requires that, assuming a 2-percentage-point rate rise, the monthly repayment still does not exceed 50% of the applicant's monthly income (the assessment was suspended in 2023 and reintroduced in 2024; actual requirements follow the latest HKMA and bank rules). This calculator back-calculates the minimum monthly income required. The loan-to-value ratio depends on the property price and whether the buyer is a first-time homebuyer (e.g. up to 90% for properties below HK$10M).
計算公式
Monthly rate r = annual rate / 12 / 100
Monthly repayment = loan × r × (1+r)^n / ((1+r)^n −1)
Stressed repayment = recalculated at (rate + 2%)
Minimum income = stressed repayment / 50%
$$M = P\frac{r(1+r)^n}{(1+r)^n-1}$$$$I_{min} = \frac{M_{stress}}{0.5}$$使用說明
- Enter the loan amount, annual interest rate and tenor.
- The calculator outputs the monthly repayment.
- It back-calculates the minimum income from the stressed (+2%) repayment.
理財情境案例
First-time buyer mortgage
4M, 3.5%, 30 years.
Monthly repayment ≈ 17,970; stressed (5.5%) ≈ 22,730; minimum monthly income ≈ 45,460.
High LTV case
6M, 3.25%, 30 years.
Monthly repayment ≈ 26,090; stressed (5.25%) ≈ 33,140; minimum monthly income ≈ 66,280.
常見問題
Why add 2% in the stress test?
The HKMA requires banks to assess borrowers' ability to repay if rates rise by 2 percentage points, ensuring the repayment stays within 50% of income and containing credit risk.
How is the loan-to-value ratio set?
It depends on the property price, whether the buyer is a first-time homeowner and proof of income. First-time buyers of properties below HK$10M may borrow up to 90% (with mortgage insurance); the ratio tapers for higher-value properties.
相關工具
參考資料
Reviewed by the Hong Kong Calculator finance team. Calculation logic and formulas follow the personal finance guidance of the Hong Kong Monetary Authority (HKMA) and the Investor and Financial Education Council (IFEC). Results are for reference only; please refer to the relevant authorities for the latest figures.