Mortgage Repayment Calculator.

How Singapore mortgages actually work

Most Singapore home loans are structured with a fixed rate for 1-3 years, then revert to a floating rate pegged to SORA (Singapore Overnight Rate Average). This calculator assumes a fixed rate for simplicity. In practice, refinancing every 2-3 years is the norm and can save tens of thousands over the loan life.

Key constraints to know

• LTV (Loan-to-Value): max 75% for first property, 45% for second, 35% for third. Drops to 55% / 25% / 15% if tenure exceeds 30 years (private) or extends past age 65.
• TDSR (Total Debt Servicing Ratio): total monthly debt cannot exceed 55% of gross monthly income.
• MSR (Mortgage Servicing Ratio): for HDB and ECs, mortgage cannot exceed 30% of gross monthly income.
• Stress test rate: banks compute TDSR using a stress rate (currently 4.0% for residential), not your actual contract rate.
• Loan tenure cap: 30 years for private, 25 years for HDB. Borrower's age + tenure should not exceed 75 for full LTV.

The 1% rule

Every 1% change in interest rate moves your monthly payment meaningfully. On a S$1.5M loan over 25 years:

• At 3.0% — S$7,113/month
• At 3.5% — S$7,510/month (+S$397/month)
• At 4.0% — S$7,917/month (+S$804/month vs 3.0%)

This is why timing your purchase relative to the rate cycle matters, and why refinancing is not optional.

Beyond the monthly

Monthly repayment is one of three numbers that matter. The other two are cash outlay at completion (downpayment, BSD, ABSD, legal, agent fees) and holding cost per year (interest, maintenance, MCST, property tax). The diagnostic call covers all three.

Indicative only. Actual bank approvals depend on income, credit history, existing debts, and current bank policy. Confirm with a mortgage broker or bank IPA before committing. Last updated for 2026 lending environment.