Singapore imposes two hard borrowing ceilings on every property buyer: the Total Debt Servicing Ratio (TDSR) at 55% and, for HDB flats and Executive Condominiums bought before the five-year Minimum Occupation Period, the Mortgage Servicing Ratio (MSR) at 30%. Both caps are applied to stressed monthly income — meaning your income is divided by a medium-term rate set by MAS (currently 4% per annum as of 2026-05), not your actual loan rate. Understanding these two ratios is the single most important step before viewing a single unit. (as of 2026-05)
The Monetary Authority of Singapore introduced TDSR in June 2013 as a macro-prudential safeguard after household debt levels climbed sharply alongside a six-year property bull run. The framework is codified in MAS Notice 645 — Property Loan Rules and has been revised several times, most recently as part of the September 2022 cooling measures. MSR predates TDSR — it was introduced in January 2013 specifically to contain debt levels on subsidised public housing, and its rules are detailed in MAS FAQs on MSR.
Together the two ratios form a layered gate: MSR screens out buyers whose monthly housing repayment alone would exceed 30% of income, while TDSR ensures total monthly debt obligations — housing loan, car loan, personal loan, credit card minimum payments, any outstanding education loan — stay below 55%. A buyer who clears TDSR may still fail MSR if the property is HDB or an uncompleted EC. The ratios work independently; both must be satisfied simultaneously.
Use the TDSR Calculator or the Affordability Calculator to model your specific numbers before approaching a bank.
What Is TDSR?
Editorial analysis for this section is being prepared.
What Is MSR?
Editorial analysis for this section is being prepared.
How Banks Calculate TDSR
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Income Types & Documentation
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Variable Income Treatment
Editorial analysis for this section is being prepared.
Strategies to Improve TDSR
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TDSR Exemptions & Special Cases
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Impact on Borrowing Capacity
Editorial analysis for this section is being prepared.
How TDSR is calculated
The formula is straightforward but the inputs require care:
- Gross monthly income — Base salary plus any eligible variable income. MAS allows variable income (bonuses, commissions, rental) to count at a 30% haircut: only 70% of variable income is recognised. Rental income is further subject to a 70% occupancy assumption, so gross rental income is multiplied by 0.7 × 0.7 = 0.49 before being added to the income pool.
- Stressed monthly repayment for the new loan — Calculated using the medium-term interest rate prescribed by MAS, currently 4% p.a. for residential property, applied over the loan tenure. This is independent of the actual loan rate you negotiate with your bank.
- All existing monthly debt obligations — Sum of minimum monthly payments on all credit facilities: car loans, personal loans, student loans, credit card minimums (typically 3% of outstanding balance), outstanding renovation loans.
TDSR = (New stressed monthly repayment + All existing monthly obligations) ÷ (Gross monthly income, after haircuts) × 100%
If the result exceeds 55%, the loan is not approved.
Worked example (as of 2026-05):
| Item | Amount (S$) |
|---|---|
| Base salary | 7,000/mth |
| Annual bonus (÷12, ×70%) | 583/mth |
| Recognised income total | 7,583/mth |
| New loan stressed repayment (4% p.a., 30-yr, $800k) | 3,817/mth |
| Existing car loan instalment | 800/mth |
| Total obligations | 4,617/mth |
| TDSR ratio | 60.9% — FAILS |
Reducing the loan to $700k or increasing recognised income above $8,394/mth would bring this buyer within the 55% ceiling.
How MSR is calculated — and when it applies
MSR applies only when the property is:
- An HDB flat (new BTO, resale HDB, or DBSS) purchased with an HDB loan or a bank loan.
- An Executive Condominium (EC) purchased during the first five-year Minimum Occupation Period (i.e., from developers; resale ECs beyond MOP are treated as private condos and are exempt from MSR).
The formula:
MSR = (Stressed monthly mortgage repayment for the HDB/EC property) ÷ (Gross monthly income, same haircuts as TDSR) × 100%
The cap is 30%. This is substantially tighter than TDSR's 55% because the government views subsidised housing as primarily for owner-occupation, not for leveraged investment.
The MSR–TDSR interaction: MSR only counts the subject property repayment, not other debts. But any buyer who must also service existing debts still faces TDSR on top of MSR. The practical effect: a buyer with even moderate existing debt will hit TDSR long before MSR becomes a binding constraint — unless their income is very high relative to the HDB price.
HDB vs bank loan stress rate (as of 2026-05): HDB loans use the prevailing HDB concessionary rate + 0.1% as the stress rate for MSR computation; bank loans to HDB buyers use the same 4% medium-term rate as private property under MAS Notice 645. This distinction affects maximum loan quantum meaningfully — an HDB borrower choosing a bank loan is stress-tested at 4%, which typically results in a smaller approved loan amount than an HDB loan for the same income.
See MAS FAQs on MSR and MAS's September 2022 cooling measures announcement for the current parameter set.
Practical steps for Singapore property buyers
- Compile your debt obligations before any bank appointment. Collect the latest statements for car loans, renovation loans, personal loans, and credit card outstanding balances. Banks will perform a bureau check — surprises here delay approvals and erode trust.
- Model your TDSR headroom before setting a budget. Use the TDSR Calculator to find your maximum stressed repayment, then work backwards to the loan amount using the Mortgage Calculator at 4% stress rate. The Affordability Calculator combines both steps.
- For HDB and EC buyers: apply the MSR screen first. If you earn S$6,000/month, your maximum stressed monthly repayment on the subject property is S$1,800 (30%). At 4% stressed, this equates to a maximum loan of roughly S$376,000 on a 30-year tenure. Know this ceiling before viewing BTO launches or EC launches.
- If you carry existing liabilities, consider clearing small ones. Eliminating a personal loan with S$400/month repayment raises your TDSR headroom for the mortgage. Run the Total Acquisition Cost Calculator to confirm full cash required including BSD, ABSD, legal fees, and agent commission before diverting cash to debt repayment.
- Understand LTV limits alongside TDSR. Even if you clear TDSR, the bank cannot lend you more than the Loan-to-Value limit (75% for first residential property with loans < 30 years, falling to 55% for second property). The LTV, CPF Limits, and Age Restrictions guide details how age and existing loans interact with the LTV ceiling.
- HDB upgraders face a dual burden. If you still have an outstanding HDB loan at the point of applying for a private mortgage, the HDB loan instalment counts inside TDSR. Many upgraders need to sell the HDB first or obtain an OTP with a longer option period. See the HDB to Condo Upgrader Roadmap for sequencing details.
Stress rate and why it matters
The most common misconception is that borrowers are stress-tested at their actual mortgage rate. They are not. MAS mandates that banks compute the monthly repayment at a medium-term interest rate of 4% per annum (as of 2026-05) regardless of the quoted rate. If rates were to rise to 4%, your repayment would be higher; if your actual rate today is 3%, the bank still uses 4% to assess TDSR. This conservative floor prevents borrowers from taking on loans that would breach TDSR only if rates stay low.
The medium-term rate has been 3.5% for most of TDSR's life; MAS raised it to 4% effective 30 September 2022 as part of the same set of cooling measures that also raised ABSD and tightened LTV ratios. A future rate decrease is possible if the rate environment normalises, but this requires an explicit MAS regulatory revision — it does not track market rates automatically.
Practical implication: On a $1.2M loan at a 30-year tenure, the difference between computing TDSR at 3.5% versus 4% is about S$267 in monthly stressed repayment. For a buyer earning S$10,000/month with no other debt, this difference alone reduces maximum eligible loan from approximately S$1.36M to S$1.28M. Run the exact figures in the Mortgage Calculator or use the Mortgage Advisor for bank package comparisons.
For the medium-term rate history and current policy rationale, consult MAS Notice 645 and the associated FAQs at the same page.
Frequently Asked Questions
What is the current TDSR limit?
Does MSR apply to private property?
Can bonus income count towards TDSR?
How does the 4% stress rate work and could it change?
MAS prescribes a medium-term interest rate of 4% per annum for TDSR and MSR computations (as of 2026-05). Banks must compute the monthly repayment at this floor rate even if the actual loan rate is lower. This is a regulatory parameter, not a market rate — it can only be changed through a formal MAS policy revision and does not track SORA or fixed-rate movements. The previous floor was 3.5%; it was raised to 4% effective 30 September 2022 as part of cooling measures. A future reduction requires MAS to issue a revised Notice 645 or accompanying FAQ update.