Monthly payment is only one part of affordability
A buyer can afford the monthly payment and still be short of cash at completion. Down payment, stamp duty, agent fee, legal fee and reserves all matter.
Loan-to-value changes the loan amount
The down payment percentage determines loan size and loan-to-value. A smaller down payment increases borrowing and may increase the user's exposure to rate changes.
Interest rate and term trade off against each other
A longer term usually lowers the monthly payment but can increase total interest. A shorter term can save interest but raises monthly cash pressure.
Extra repayment can be powerful
Adding extra monthly repayment or one-off prepayment reduces balance faster. The calculator estimates interest saved and the number of months until payoff.
Upfront buyer cash should be estimated early
The tool combines down payment, stamp duty, agent fee, legal fee and prepayment so users can see a broader cash-needed estimate before committing.
Bank quotes can still differ
Actual mortgages may use lender-specific compounding, approval rules, valuation assumptions, mortgage insurance, fees and product terms. Treat the calculator as a planning tool, not a loan offer.
Common questions
Frequently asked questions
What does the monthly payment include?+
The calculator estimates principal and interest repayment. It can also show management fee in total-cost planning, but lender quotations may differ.
Does the calculator approve my mortgage?+
No. Mortgage approval depends on lender rules, stress tests, property valuation, credit profile, income evidence and regulatory requirements.
Why include stamp duty in a mortgage calculator?+
Stamp duty is a buyer cash-flow item. Including it helps users estimate upfront cash instead of focusing only on the loan payment.
Can extra payments reduce interest?+
Yes. Extra monthly payments or a one-off prepayment reduce principal faster in the calculator's amortisation model.
Official source and scope
Hong Kong Monetary Authority residential mortgage informationRule period: User-entered calculation assumptions
Next scheduled review: 1 October 2027
The calculation explanation, assumptions and linked tool method were reviewed without claiming a statutory rate.
This guide explains general rules and does not replace personalised tax, financial, employment or legal advice. For exact filing, payroll, lending or compliance decisions, use the official source and professional guidance where needed.