Disclaimer (Block 1): This article is for educational purposes only and is intended to assist CEA-registered property agents in understanding regulatory frameworks. It does not constitute financial, tax, or legal advice. LEVR's calculations are indicative only. Always verify rates and eligibility with your bank, HDB, CPF Board, or a licensed financial advisor before advising clients.
Why Interest Rate Risk Matters to Property Buyers
For a SGD 800,000 home loan over 25 years, the difference between a 2.5% rate and a 4.0% rate is approximately SGD 670 per month in repayments — SGD 8,000 per year, or SGD 200,000 over the loan tenure. For buyers who modelled affordability at low 2021-era rates and are purchasing in a higher-rate environment, this gap can push monthly obligations materially beyond the originally planned budget.
Interest rate risk is the risk that rates rise after a buyer locks in their loan terms (for fixed-rate packages) or during the loan tenure (for floating-rate packages). CEA agents cannot predict where rates will go, but they can help buyers understand what they are committing to and how to stress-test the numbers before the OTP is exercised.
Fixed vs Floating Rate Mortgages in Singapore
Singapore bank mortgages for private residential property fall into two broad categories:
| Package Type | How the Rate Is Set | Repricing Risk | Typical Lock-In Period |
|---|---|---|---|
| Fixed rate | Interest rate fixed at a predetermined level for the lock-in period (typically 2–3 years) | None during lock-in; rate reverts to bank’s board rate or floating rate at lock-in expiry | 2–3 years, then floats or reprices |
| Floating rate (SORA-pegged) | Compounded Singapore Overnight Rate Average (SORA) plus a spread set by the bank | Reprices monthly or quarterly as SORA moves; rate can rise or fall with market conditions | Typically no lock-in, or shorter lock-in than fixed packages |
| Board rate package | Rate set at the bank’s internal board rate, which the bank can adjust at its discretion | Opaque; rate movements are not tied to a published benchmark | Varies; less common for residential mortgages post-2021 |
Following MAS guidelines, Singapore banks replaced SIBOR-linked packages with SORA-pegged packages as the standard floating rate reference. SORA is published daily by MAS and reflects actual overnight unsecured lending transactions between banks — making it a transparent, market-determined benchmark.
Understanding SORA-Pegged Mortgages
A SORA-pegged mortgage charges the borrower:
Effective rate = Compounded SORA (3-month or 1-month) + Bank spread
The compounded SORA figure is calculated over the reference period (most commonly 3 months) and published by MAS. The bank spread is a fixed margin added on top — typically 0.8% to 1.5% above SORA depending on the lender and package terms.
The total rate a borrower pays changes as SORA moves. When SORA falls (as it did in late 2024 with US Federal Reserve rate cuts feeding through), floating-rate borrowers benefit from lower monthly repayments without refinancing. When SORA rises (as it did sharply in 2022–2023), floating-rate borrowers see monthly repayments increase, sometimes materially.
Agent note: Clients who took SORA-pegged packages in 2022 saw their effective mortgage rate rise from under 2% to above 4% within 18 months. For a SGD 1 million loan, this increased monthly repayments by approximately SGD 1,200 per month. Buyers in a higher-rate environment should model repayments at current rates, not the rates that prevailed when their property was marketed. Always use the current SORA rate plus the bank’s spread as the base case, not a marketed teaser rate.
The MAS 4.0% Floor Rate for TDSR
MAS requires banks to stress-test a borrower’s TDSR at a medium-term interest rate floor of 4.0% per annum for private residential property loans. This means that even if a borrower is taking a loan at a current rate of 3.5%, the bank must check that the borrower’s TDSR does not exceed 55% when the monthly repayment is computed at 4.0%.
The 4.0% floor rate is a regulatory buffer. If a borrower can only pass TDSR at today’s rate but fails at 4.0%, the bank will not approve the loan quantum the borrower requests.
For HDB concessionary loans and HDB-financed EC purchases, MAS applies the stress-test at the higher of the prevailing HDB loan rate or 3.0%. The 4.0% floor applies to bank loans for both private property and HDB resale flats.
CEA agents can run the TDSR stress test using LEVR’s TDSR Calculator before the client submits a loan application, using the 4.0% rate to confirm the proposed loan quantum is within the regulatory ceiling.
HDB Concessionary Loan Rate
The HDB concessionary loan rate is set at 0.1% above the prevailing CPF Ordinary Account (OA) interest rate. As at Q2 2026, the CPF OA rate is 2.5%, giving an HDB loan rate of 2.6%. This rate is reviewed quarterly and adjusted if the CPF OA rate changes.
The HDB loan rate has been notably more stable than bank mortgage rates over the past three years. Buyers who took HDB concessionary loans in 2021 paid 2.6% and continue to pay around the same rate in 2026, while bank floating-rate borrowers experienced significant rate volatility over the same period.
The trade-off is LTV: HDB loans allow up to 80% LTV versus bank loans at 75% LTV, meaning HDB borrowers can put down less cash. But HDB loans are only available to eligible buyers (income ceiling applies, SC must be among borrowers), and they cannot be refinanced to a bank loan without forfeiting certain benefits.
How to Stress-Test Interest Rate Risk Before the OTP
The stress-test conversation with a buyer should cover three scenarios:
- Base case: Current market rate (e.g., SORA + spread, totalling approximately 3.2% to 3.8% in Q2 2026 depending on lender). This is what the buyer will actually pay in month one.
- Stress case: 4.0% per annum (the MAS floor rate). If the buyer cannot comfortably handle repayments at 4.0%, they are taking rate risk they may not be able to absorb.
- Lock-in expiry case: What happens when the fixed rate period ends? If the buyer locks in at 3.2% fixed for 2 years, what rate environment will they be refinancing into? If the answer is “we don’t know”, the buyer should be modelled at 4.0% at lock-in expiry to understand worst-case monthly repayments.
LEVR’s Home Loan Calculator allows any rate to be entered. To run the stress test:
- Enter the loan amount (purchase price minus down payment), tenure, and the current market rate. Note the monthly repayment.
- Change the rate to 4.0%. Note the new monthly repayment and compare to the buyer’s monthly income and existing obligations.
- If the stressed repayment exceeds 30% of gross monthly income for HDB/EC buyers (MSR), or pushes total obligations above 55% of gross monthly income (TDSR), flag this to the client before any commitment is made.
Refinancing: What Buyers Should Know
Most buyers on bank loans refinance when their fixed-rate lock-in period expires, or when floating-rate packages become significantly more competitive. Key points for buyers to understand:
- Lock-in penalties: Refinancing during a lock-in period typically incurs a penalty of 1.5% of the outstanding loan amount. Buyers who need to refinance early due to rate increases face this cost on top of the new package setup fees.
- Legal and valuation fees: Refinancing to a new lender requires new legal documentation and often a new valuation. Total costs of SGD 2,000 to SGD 5,000 are typical for a straightforward refinance, which should be factored into the break-even analysis of switching packages.
- Repricing vs refinancing: Some banks offer repricing (switching to a new rate package with the same lender) at lower cost than a full refinance. Repricing fees are typically SGD 500 to SGD 1,000, making it cost-effective for buyers whose lock-in expires with their current lender offering competitive packages.
- HDB loan cannot be refinanced to HDB: Buyers who switch from HDB concessionary loan to a bank loan cannot switch back to the HDB concessionary loan. This is an irreversible decision.
CEA agents are not mortgage advisers, and refinancing decisions require a mortgage broker or the buyer’s bank. The agent’s role is to surface the rate risk question at the point of property decision — not at the point of financing, when options are already narrowed by the chosen property and committed price.
Disclaimer (Block 3): LEVR's calculator outputs are estimates based on inputs provided and current regulatory parameters as known at time of publication. They are not a guarantee of borrowing capacity, stamp duty liability, or CPF eligibility. Regulatory thresholds and rates may change. Always verify with IRAS, your bank, or a licensed financial advisor before making financial decisions.