Subsidised Housing Mortgage Calculator
Enter the home price, loan-to-value ratio, and annual rate to compute the high-LTV mortgage monthly payment and total interest for HOS, Green Form, or White Form subsidised housing.
Input Data
Results
At a glance:A subsidised-housing mortgage uses a high LTV with a government guarantee; this calculator works out the payment, loan, down payment, and interest.
Formula
loanAmount = homePrice × ltvPct%
downPayment = homePrice − loanAmount
monthlyPayment = loanAmount × r·(1+r)^n / ((1+r)^n − 1) (r = annualRate%/12, n = years×12)
totalInterest = monthlyPayment × n − loanAmount
totalPayment = homePrice + totalInterest
$$L = P\times \text{LTV},\quad D = P - L$$$$M = \dfrac{L\cdot i}{1-(1+i)^{-n}}$$How to Use
- Enter the home price and LTV ratio.
- Enter the annual rate and term.
- Review the monthly payment, loan amount, down payment, and interest.
FAQ
Why can subsidised housing qualify for a high-LTV mortgage?
Because the Housing Authority, the Housing Society, or the Mortgage Corporation provides a mortgage guarantee for eligible buyers, covering the bank's risk. This lets banks offer mortgages of up to 90% or even 95% LTV, usually without a mortgage insurance premium. The exact guaranteed LTV and term follow each scheme's latest rules.
What is the difference between HOS, Green Form, and White Form?
HOS (Home Ownership Scheme) is discount-priced subsidised housing sold by the Housing Authority. Green Form is mainly for eligible public rental tenants, while White Form (White Form Secondary Market Scheme) lets eligible non-public-housing buyers purchase second-hand HOS flats without premium paid. Their mortgage guarantees and resale restrictions differ slightly, so check each scheme's details before applying.
Do subsidised-housing mortgages require a mortgage insurance premium?
Generally no. With an existing government or institutional guarantee, eligible high-LTV subsidised-housing mortgages are usually exempt from mortgage insurance premiums, which is a major advantage over high-LTV mortgages in the private market.
What resale restrictions apply to subsidised housing?
Unsold-premium subsidised flats carry resale restrictions: they can only be sold in the HOS secondary market to eligible persons after a specified lock-up period, and selling in the open market requires first paying the premium to the government. This affects the property's liquidity and realisation ability.
Does the stress test still apply?
Subsidised-housing mortgages must still meet the banks' and regulators' repayment and approval requirements, but some schemes have more relaxed debt-to-income or stress-test arrangements than the private market. Actual requirements follow the banks' and the schemes' latest guidance.
This calculator's content is reviewed by our Licensed Mortgage Referral & Housing Policy Advisory team. Results are for reference only; please refer to the relevant authorities for the official figures.