Mortgage Affordability Calculator
Calculate monthly mortgage repayments, total interest, stamp duty and the total cost of buying a home. The HKMA suspended the +2% interest-rate stress test from February 2024; mortgages are now assessed on debt-to-income ratio (DSR) not exceeding 50%. You can also compare the total cost of renting versus buying.
Mortgage inputs
Monthly repayment
Loan amountHK$3,500,000 · Down paymentHK$1,500,000
Reference stress-test monthly repayment
Monthly repayment after +2% rate rise (suspended, for reference only)
Reference stress-test DSR
Current DSR requirement: no more than 50%
Current DSR
HKMA requires no more than 50%
Total interest
Stamp duty
Tax rate 2.25%
Total cost of buying
Includes down payment, taxes, repayments and mortgage insurance
Loan-to-value (LTV)
High-LTV mortgage insurance premium
Estimated mortgage insurance premium
Estimated by loan amount
Affordable property price based on income:With monthly income of HK$50,000 and a 50% debt-to-income ratio, maximum loan is aboutHK$4,993,772, corresponding to a property price of aboutHK$7,133,960.
The entered property price is affordable, but remember to set aside funds for renovation, management fees and maintenance reserves.
Rent vs. buy comparison:Total rental expense over the periodHK$4,500,000; total cost of buying HK$6,926,547, differenceHK$2,426,547.
Buying costs more than renting, but builds assets and offers housing stability.
Under both current and stress-test rates, the DSR is below 50%, preliminarily meeting bank approval conditions. The actual LTV is still subject to property type and mortgage insurance.
Compare how the remaining principal, cumulative principal repaid and cumulative interest change over time to see the impact of compounding on total cost.
| Month | Repayment | Interest | Principal | Remaining principal |
|---|---|---|---|---|
| 1 | HK$17,522 | HK$10,208 | HK$7,313 | HK$3,492,687 |
| 2 | HK$17,522 | HK$10,187 | HK$7,335 | HK$3,485,352 |
| 3 | HK$17,522 | HK$10,166 | HK$7,356 | HK$3,477,995 |
| 4 | HK$17,522 | HK$10,144 | HK$7,378 | HK$3,470,618 |
| 5 | HK$17,522 | HK$10,123 | HK$7,399 | HK$3,463,219 |
| 6 | HK$17,522 | HK$10,101 | HK$7,421 | HK$3,455,798 |
| 7 | HK$17,522 | HK$10,079 | HK$7,442 | HK$3,448,355 |
| 8 | HK$17,522 | HK$10,058 | HK$7,464 | HK$3,440,891 |
| 9 | HK$17,522 | HK$10,036 | HK$7,486 | HK$3,433,405 |
| 10 | HK$17,522 | HK$10,014 | HK$7,508 | HK$3,425,898 |
| 11 | HK$17,522 | HK$9,992 | HK$7,530 | HK$3,418,368 |
| 12 | HK$17,522 | HK$9,970 | HK$7,552 | HK$3,410,816 |
Scenario comparison
Save two sets of inputs and compare the results side by side.
HK$5M home example
Not saved
HK$6M home example
Not saved
Understanding Mortgage Affordability and HOS Home Loans
Buying property in Hong Kong usually involves a mortgage. When approving private residential mortgages, banks mainly calculate the debt servicing ratio (DSR), which the HKMA currently requires to be no more than 50%. On 28 February 2024 the HKMA announced that the +2 percentage point mortgage interest rate stress test was suspended; banks now mainly approve based on DSR not exceeding 50%. Borrowers should still assess their own ability to pay if interest rates rise.
HOS flats and Green Form Subsidised Home Ownership Scheme (GSH) flats enjoy government guarantee advantages. Green Form applicants can borrow up to 95% and White Form applicants up to 90%, with no mortgage insurance required. Banks only need to ensure the current DSR does not exceed 50%. From March 2024, the maximum repayment period for new HOS and GSH flats was extended to 30 years, further reducing monthly payment pressure.
HK FinBox 的供樓負擔能力計算機同時支援私樓與居屋 / 綠置居兩種模式。輸入樓價、首期成數、按揭利率、還款年期及家庭月入後，計算機會自動按物業類型計算每月供款、DSR、參考壓力測試數字（已暫停實施，僅供參考）及可負擔樓價。切換到居屋模式時，系統會自動鎖定免按揭保險，並將最高貸款成數解鎖至 95%。
Private homebuyers should budget for stamp duty, legal fees, agent commission, renovation and furniture. HOS/GSH buyers should note that unsubsidised units can only use P-rate mortgages, resale is restricted, and Green Form and White Form applicants differ in eligibility, ballot chances and loan-to-value ratios. If your DSR only just passes, you will face greater pressure when interest rates rise, so consider a more conservative property price or a larger down payment.
References
- 1Countercyclical Macro-Prudential Measures for Property Mortgage Loans(Hong Kong Monetary Authority)
- 2Current Ad Valorem Stamp Duty Rates for Residential Property(Inland Revenue Department)
Rules and links last reviewed: 26 July 2026 · The sources above are for reference only; please refer to the latest official announcements from the relevant organisations.
FAQs
What is the mortgage stress test?
Do HOS / GSH flats require a stress test?
What is the maximum loan-to-value ratio for HOS Green Form and White Form applicants?
What is the current DSR cap?
Can HOS flats use H-rate mortgages?
Does the calculator result equal the bank's approval?
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Client-side only: All data is calculated on your device and is not uploaded to any server. Results are for reference only and do not constitute professional financial or legal advice.