Mortgage Stress Test Singapore
The minimum interest rate MAS requires banks to use when assessing TDSR and MSR, regardless of the actual rate offered on the loan
The mortgage stress test in Singapore refers to the practice, mandated by the Monetary Authority of Singapore, of calculating a borrower’s Total Debt Servicing Ratio and Mortgage Servicing Ratio using a stipulated minimum interest rate floor rather than the actual promotional rate on the loan, ensuring borrowers can still afford repayments if interest rates rise.
Not financial advice. All figures for educational reference only. Data as at November 2026.
- MAS requires banks to assess loan affordability using a medium-term interest rate, currently stipulated at a floor of 4.0% for residential property loans, even if the loan’s actual offered rate is significantly lower.
- This stress test rate applies specifically to the TDSR and MSR calculations used to determine the maximum loan a borrower qualifies for — it does not change the interest rate actually charged on the loan itself.
- Because the stress test rate is often higher than prevailing promotional rates, the maximum loan amount a borrower qualifies for is usually smaller than what might appear affordable based on the advertised rate alone.
- The stress test floor is reviewed periodically by MAS and can be adjusted in response to the broader interest rate environment, so the exact figure used in any calculation should be confirmed as current before relying on it.
- The rule exists specifically to prevent borrowers from over-extending based on temporarily low promotional rates, protecting both borrowers and the financial system from a wave of defaults if rates were to rise sharply after loan approval.
Table of Contents
What Is Mortgage Stress Test?
The mortgage stress test addresses a specific vulnerability in how mortgages are typically marketed: banks often advertise attractive promotional interest rates for the first one to three years of a loan, with the rate reverting to a higher reference-rate-linked rate afterward. If affordability were assessed purely on the attractive initial promotional rate, a borrower could qualify for a loan that becomes genuinely unaffordable once the rate reverts upward, or if broader interest rates rise during the loan’s life. MAS’s stress test rule closes this gap by requiring banks to assess affordability using a conservative, standardised floor rate, regardless of what promotional rate is actually being offered.
This stress test rate is sometimes called the ‘medium-term interest rate’ in MAS’s own guidance, and it currently floors loan affordability assessments at a minimum of 4.0% per annum for residential property loans, a figure that has been adjusted over the years as the broader rate environment has shifted. Importantly, this is purely a calculation input used to determine the maximum loan a borrower qualifies for under TDSR (and MSR, where applicable) — it is not the rate the borrower actually pays. A borrower could be assessed using a 4.0% stress test rate while their actual loan carries a promotional rate of 2.8%, with the lower rate applying for actual repayment calculations once the loan is approved and disbursed.
The stress test applies uniformly across all banks for both TDSR (covering all property types) and MSR (specifically for HDB flats and Executive Condominiums), ensuring no bank can offer a competitive edge by stress-testing more leniently than a competitor, which keeps the entire banking system’s lending standards consistent regardless of which bank a borrower approaches.
How It Works in Singapore
When a bank calculates a borrower’s maximum qualifying loan, it does not use the attractive promotional rate shown in the marketing material for the TDSR or MSR calculation. Instead, it applies the higher of the stress test floor rate (currently 4.0%) or the loan’s actual thereafter rate (if that happens to be higher than the floor), to compute what the monthly instalment would be under that more conservative rate, and checks whether that stressed instalment, combined with the borrower’s other debt obligations, still fits within the 55% TDSR ceiling (and 30% MSR ceiling for HDB and EC purchases, where applicable).
This means two borrowers seeking the same loan amount but offered different promotional rates by different banks will generally be assessed using the same stress-tested affordability calculation, since the floor rate — not the promotional rate — drives the TDSR and MSR outcome in most current rate environments. Only if a borrower’s actual contracted rate is itself above the stress test floor would the bank use that higher actual rate for the assessment instead, since the rule always applies the higher of the two.
Worked Example
A borrower earning S$8,000 a month, with no other debt, wants to know the maximum HDB loan she can qualify for. If the bank assessed affordability using the attractive promotional rate of 2.6% currently on offer, she might appear to qualify for a loan generating an instalment that uses the full 30% MSR ceiling, suggesting a larger loan quantum. But because MAS requires the stress test floor of 4.0% to be used instead, the bank calculates the maximum instalment that still fits within 30% of her income at the higher 4.0% stressed rate, which produces a smaller maximum loan quantum than the promotional rate alone would suggest — even though her actual monthly repayment, once the loan is disbursed, will still be calculated using the real 2.6% promotional rate she is actually charged.
Advantages
- Protects borrowers from future rate-rise shock. By sizing the maximum loan conservatively, the stress test reduces the risk that a borrower takes on more debt than they could handle if rates rise after the promotional period ends.
- Protects the broader financial system. A systemic stress test applied consistently across all banks reduces the risk of a wave of mortgage defaults if interest rates were to rise sharply across the economy.
- Levels the playing field between banks. Because every bank must apply the same floor rate for affordability assessment, no bank can win business by underwriting more aggressively on the strength of a temporarily attractive promotional rate.
- Transparent and predictable. The stress test rate is a known, published figure, so borrowers and mortgage brokers can reasonably estimate maximum loan eligibility in advance, before formally applying.
Risks and Limitations
- Reduces the maximum loan quantum available. Borrowers who expected to qualify for a larger loan based on an attractive promotional rate may be disappointed to learn their actual maximum is smaller once the stress test rate is applied.
- Can exclude borrowers who would genuinely be comfortable at the lower actual rate. A borrower confident in their ability to manage repayments at the real promotional rate has no way to use that lower rate for qualification purposes, even if their personal financial situation would support it.
- The floor rate can be revised. If MAS adjusts the stress test floor upward in response to a rising rate environment, maximum loan quantums for new applications can shrink further, affecting buyers mid-way through a purchase decision.
- Can complicate upgrading decisions. A borrower looking to upgrade to a larger property may find their maximum new loan more constrained than expected, if their existing obligations combined with the new loan’s stressed instalment push them close to the TDSR ceiling.
Common Mistakes Singapore Borrowers Make
Estimating maximum loan eligibility using the promotional rate. Buyers who informally calculate their own affordability using the attractive headline rate, rather than the stress test floor, often overestimate how much they will actually be approved for.
Assuming the stress test rate is what they’ll actually pay. Some borrowers mistakenly believe the 4.0% stress test figure is their real interest rate, when it is purely a conservative input for the bank’s internal affordability calculation, not the rate charged on the loan.
Not re-checking eligibility after a change in the stress test floor. Because MAS can revise the floor rate, a borrower who calculated their eligibility some time ago should re-verify it against the current floor before finalising a purchase decision.
Stress Test Rate vs Actual Loan Rate
| Feature | Stress Test Rate | Actual Loan Rate |
|---|---|---|
| Purpose | Used only to calculate maximum loan eligibility (TDSR/MSR) | The rate actually charged on the disbursed loan |
| Current typical figure | 4.0% floor (as mandated by MAS) | Varies by bank and package, often 2.5%-3.5% |
| Who sets it | MAS, applied uniformly across all banks | Each bank, based on its own pricing and promotions |
| Affects monthly repayment? | No, purely a qualification calculation | Yes, determines the real monthly instalment |
| Can change over time? | Yes, MAS reviews and adjusts periodically | Yes, depending on reference rate movements and repricing |
The Bottom Line
The mortgage stress test is the reason a borrower’s maximum approved loan is often smaller than a quick calculation using the advertised promotional rate would suggest — MAS requires banks to size loans conservatively using a stress test floor rate, currently 4.0%, specifically to protect both individual borrowers and the financial system from the risk of future interest rate increases.
Related Terms:
Frequently Asked Questions
What is the current mortgage stress test rate in Singapore?
As at November 2026, MAS stipulates a medium-term interest rate floor of 4.0% per annum for assessing residential property loan affordability under TDSR and MSR, though this figure is periodically reviewed and can change.
Do I actually pay the stress test interest rate on my loan?
No, the stress test rate is used purely to calculate your maximum loan eligibility; your actual monthly repayment is based on the real interest rate charged on your loan, which is often lower than the stress test floor.
Why is my approved loan amount smaller than I expected based on the advertised rate?
Because banks must assess your maximum eligible loan using the higher stress test floor rate rather than the advertised promotional rate, your maximum qualifying loan amount is often smaller than a calculation based on the promotional rate alone would suggest.
Does the stress test rate apply to both HDB and private property loans?
Yes, the stress test floor applies to TDSR calculations for all property types, and additionally to MSR calculations specifically for HDB flats and Executive Condominiums.
Can the mortgage stress test rate change?
Yes, MAS periodically reviews and can adjust the stress test floor rate in response to the broader interest rate environment, so borrowers should confirm the current figure before relying on an older calculation.
Disclaimer: This glossary entry is for educational purposes only and does not constitute financial advice. Data sourced from official regulator and industry websites as at November 2026.