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. MSR rules and prevailing rates are subject to change. Always verify current caps with HDB or the lending institution before advising clients on maximum loan amounts.
What Is the Mortgage Servicing Ratio (MSR)?
The MSR is a regulatory cap that limits the monthly mortgage repayment to 30% of the borrower’s gross monthly income. Unlike the TDSR, which caps all debt obligations at 55% of gross monthly income, the MSR applies only to the mortgage repayment itself — and it applies only for:
- HDB flat purchases (both HDB concessionary loans and bank loans)
- Executive Condominium (EC) purchases within the first five years from key collection (i.e., during the MOP period)
Private condominiums, landed properties, and privatised ECs are not subject to the MSR. For those property types, only the TDSR applies.
When MSR Applies
The table below shows when MSR and TDSR each apply depending on the property type and loan type:
| Property Type | Loan Type | MSR Applies? | TDSR Applies? |
|---|---|---|---|
| HDB flat | HDB concessionary loan | Yes (30%) | No |
| HDB flat | Bank loan | Yes (30%) | Yes (55%) |
| New launch EC (within 5 years of key collection) | Bank loan | Yes (30%) | Yes (55%) |
| EC after MOP, before full privatisation (years 5–10) | Bank loan | No | Yes (55%) |
| Fully privatised EC (after 10 years from TOP) | Bank loan | No | Yes (55%) |
| Private condo or landed property | Bank loan | No | Yes (55%) |
Source: MAS Notice 645; HDB housing loan eligibility. Verified as at Q2 2026.
When both MSR and TDSR apply simultaneously (bank loan on an HDB flat or EC), the tighter cap binds. Because MSR (30%) is always lower than TDSR (55%), MSR will be the binding constraint for the mortgage repayment component in almost every scenario.
How MSR Is Calculated
The formula is straightforward, but the input to the monthly repayment calculation differs depending on the loan type.
Maximum monthly mortgage repayment = 30% × gross monthly income
Bank loans on HDB flats and ECs
Under MAS Notice 645, the monthly repayment is stress-tested at a floor rate of 4% per annum (or the prevailing loan rate, whichever is higher). The resulting monthly repayment at the higher of these two rates must not exceed 30% of gross monthly income.
HDB concessionary loans
For HDB concessionary loans, the MSR is calculated at the prevailing HDB concessionary loan rate — 2.6% per annum as at Q2 2026 — with no additional stress test above this rate. The monthly repayment at 2.6% must not exceed 30% of gross monthly income.
This means HDB loan borrowers are assessed at a lower rate than bank loan borrowers, which results in a slightly higher maximum loan quantum for the same income level — all else being equal.
MSR vs TDSR — Which One Bites?
For most HDB buyers, MSR (30%) is the binding constraint, not TDSR (55%). Consider the following worked example:
- Gross monthly income: SGD 8,000
- Existing monthly debt obligations: none
- TDSR cap: SGD 4,400/month (55% × SGD 8,000)
- MSR cap: SGD 2,400/month (30% × SGD 8,000)
At a 4% bank loan stress-test rate over a 25-year tenure (maximum for HDB bank loans):
- Maximum loan under MSR (SGD 2,400/month): approximately SGD 456,000
- Maximum loan under TDSR alone (SGD 4,400/month): approximately SGD 836,000
MSR cuts the maximum loan by nearly half. This is a critical distinction for agents whose clients expect TDSR-level borrowing on an HDB purchase. Quoting a client the TDSR ceiling for an HDB flat overstates their borrowing capacity by more than SGD 380,000 in this example.
Agent note: Many HDB buyers — especially those upgrading from private back to HDB — are surprised to discover the 30% MSR cap applies. They may have passed TDSR comfortably on their private property loan but face a much tighter constraint for HDB financing. A client who borrowed SGD 1.2M for a private condo on 55% TDSR may find they can only borrow SGD 400,000–500,000 for an HDB resale flat on 30% MSR.
MSR and Joint Borrowers
For joint HDB or EC loan applications, MSR is calculated on the combined gross monthly income of all borrowers. This increases the MSR ceiling proportionally.
For example, if two borrowers have combined gross monthly income of SGD 14,000:
- MSR cap: SGD 4,200/month (30% × SGD 14,000)
- Maximum loan at 4% stress test, 25-year tenure: approximately SGD 798,000
If one borrower earns SGD 10,000 and the other earns SGD 4,000, the combined figure still produces the same MSR ceiling. However, agents should note that lenders assess each borrower’s income individually for eligibility purposes — both borrowers must be included in the application for their income to be counted in the MSR calculation.
Impact on HDB Upgrader Strategy
Agents advising clients who are selling HDB to buy private property, and who may want to retain HDB options later, should model MSR early in the planning process. The relevant scenarios are:
- Private to HDB downgrade: Clients moving from private property back to HDB resale face the MSR cap on the HDB bank loan. Their borrowing capacity drops sharply relative to what they were accustomed to on their private property loan.
- HDB resale with bank loan: Clients who prefer a bank loan over an HDB concessionary loan (to access lower floating rates) are still subject to the 30% MSR, stress-tested at 4%.
- EC purchase: Clients buying a new launch EC on a bank loan face both MSR and TDSR. MSR is the binding constraint for the mortgage portion. Agents should not treat EC loans like private condo loans.
Modelling MSR early prevents clients from budgeting for an HDB purchase price that their bank loan cannot support. A client who assumes SGD 700,000 borrowing capacity on TDSR may find their HDB bank loan capped at SGD 380,000 under MSR.
Using LEVR to Model MSR
LEVR’s TDSR Calculator applies both the 55% TDSR and 30% MSR caps automatically. For HDB and EC purchases, the calculator surfaces the lower of the two ceilings as the binding maximum loan quantum.
- Enter the client’s gross monthly income and all existing monthly debt obligations (car loan, personal loan, credit card minimums, etc.)
- LEVR calculates both the TDSR ceiling (55%) and the MSR ceiling (30%) and displays both figures
- For HDB flat or EC purchases, the MSR ceiling is the binding maximum for the mortgage repayment
- Use the resulting maximum monthly repayment to back-calculate the maximum loan at the applicable stress-test rate and tenure
Running both checks takes under two minutes in LEVR and prevents agents from quoting clients a loan quantum that the bank will not approve.
Disclaimer (Block 3): LEVR calculations are indicative only and are not a guarantee of borrowing capacity or loan eligibility. They do not constitute financial, tax, or legal advice. MSR rules and prevailing rates — including the HDB concessionary loan rate and the MAS stress-test floor rate — are subject to change. Always verify current caps with HDB or the lending institution before advising clients on maximum loan amounts. Verified against Q2 2026 MAS Notice 645 and HDB housing loan guidelines.