Mortgage Loan Calculator (Singapore)
Estimate your monthly housing loan repayment, total interest paid, and simple affordability ratios such as TDSR and MSR.
How to use this mortgage loan calculator in Singapore
If you are buying a condo, landed home, HDB flat, or executive condominium, this mortgage loan calculator Singapore tool gives you a practical starting point. It helps you estimate the monthly instalment and total interest based on your property price, down payment, interest rate, and loan tenure.
While this calculator is useful for planning, always confirm your numbers with your bank, mortgage broker, or financial adviser because actual loan approval depends on your full credit profile, age, debt obligations, property type, and regulatory limits.
What this calculator estimates
- Estimated loan amount after down payment
- Monthly mortgage instalment using a standard amortization formula
- Total repayment and total interest over the full loan tenure
- Simple affordability checks (TDSR and, for HDB/EC, MSR indicator)
- Stress-tested monthly instalment at +1.0% interest
Key mortgage concepts in Singapore
1) Loan-to-Value (LTV)
LTV limits determine how much you can borrow relative to the property value or purchase price (whichever is lower). If your maximum LTV is lower, you need a larger down payment.
2) TDSR (Total Debt Servicing Ratio)
TDSR compares your total monthly debt obligations (including your new home loan) against your gross monthly income. In many scenarios, this ratio is capped at 55%. If your ratio is too high, your approved loan amount can be reduced.
3) MSR (Mortgage Servicing Ratio)
MSR applies to certain HDB and EC purchases. It focuses specifically on your mortgage instalment as a percentage of gross monthly income. A common reference cap is 30%, though eligibility details can vary.
4) Fixed vs floating rates (SORA packages)
Singapore borrowers often choose between fixed-rate packages and floating rates tied to benchmarks such as compounded SORA. Fixed rates offer certainty for a lock-in period; floating rates may move up or down over time.
Example scenarios
Here are simple illustrations to show how sensitive monthly repayments are to interest rate and tenure:
- Scenario A: Loan amount SGD 900,000 at 3.0% for 25 years: lower monthly instalment than a shorter tenure, but higher total interest over time.
- Scenario B: Same loan at 4.0% for 25 years: noticeably higher monthly instalment and total interest.
- Scenario C: Same loan at 3.0% for 20 years: higher monthly instalment but significantly lower total interest compared with 25 years.
Costs beyond your mortgage instalment
When budgeting for a home in Singapore, remember to include these additional costs:
- Buyer’s Stamp Duty (BSD)
- Additional Buyer’s Stamp Duty (ABSD), if applicable
- Legal conveyancing fees
- Valuation and administrative charges
- Home insurance and, where relevant, mortgage insurance
- Renovation and furnishing expenses
- Property tax, maintenance fees, and conservancy charges
Tips to improve mortgage affordability
- Increase down payment to reduce loan size and monthly instalments
- Compare multiple loan packages before committing
- Keep other debt low to improve your TDSR profile
- Use realistic stress-test rates instead of best-case assumptions
- Build emergency savings before taking on a long-term loan
- Review refinancing options periodically after lock-in periods
Frequently asked questions
Is this calculator accurate enough for a final loan decision?
It is accurate for planning and comparison, but not a loan offer. Final terms depend on lender policy, your income documents, credit profile, age, and current regulations.
Can I use CPF for mortgage payments?
Many buyers use CPF Ordinary Account (OA) funds for eligible housing payments, subject to CPF usage rules and limits. Check current CPF and lender guidelines before relying on CPF contributions in your long-term plan.
What if interest rates rise?
Rising rates can increase repayments for floating packages. That is why this page includes a simple +1% stress test so you can see whether your cash flow remains comfortable.
Final note
A mortgage is often the largest financial commitment in life. Use this mortgage loan calculator Singapore tool to plan your budget, compare scenarios, and avoid overborrowing. Then confirm your figures with licensed professionals before making a purchase decision.