What is the Mortgage Servicing Ratio (MSR)?

The Mortgage Servicing Ratio (MSR) is an additional borrowing limit that applies specifically to loans for the purchase of HDB flats and Executive Condominiums (ECs) that have not yet completed their minimum occupation period (MOP). It operates alongside the TDSR as a tighter constraint on borrowing capacity for these property types.

The 30% Cap

Under the MSR framework, the monthly mortgage instalment for the HDB flat or EC must not exceed 30% of the borrower's gross monthly income. Unlike TDSR, which considers all debt obligations, MSR looks solely at the proposed mortgage repayment for the specific property being purchased. This makes it a more focused but often more binding constraint for HDB and EC buyers.

The Stress-Test Rate

Like TDSR, MSR is calculated using a stress-test interest rate - currently 4% per annum or the prevailing rate, whichever is higher - to ensure affordability holds even if rates rise over the life of the loan.

How MSR and TDSR Work Together

To illustrate the interaction between the two frameworks, consider a household earning S$10,000 per month with S$500 in existing monthly debt obligations. Under MSR (30%), the maximum monthly mortgage repayment is S$3,000. Under TDSR (55%), the maximum total monthly debt is S$5,500, of which S$5,000 remains available for the mortgage after accounting for the S$500 in existing debt. In this case, MSR is the binding constraint - limiting the mortgage payment to S$3,000 rather than the S$5,000 that TDSR alone would permit.

This dual-cap system means that borrowing capacity for HDB flats and ECs is typically lower than for private properties of equivalent value. A household that could borrow S$1 million for a private condominium under TDSR alone might qualify for only S$700,000 to S$800,000 for an HDB flat once MSR is applied.

When MSR Does Not Apply

MSR does not apply once an EC has been fully privatised upon completing its 10-year MOP. At that point, the property is treated as private property and only TDSR governs borrowing limits. Similarly, MSR exemptions exist for owner-occupiers refinancing loans on properties purchased before the MSR rules took effect - specifically, HDB flats bought before 12 January 2013 and ECs purchased directly from a developer before 10 December 2013.

Why This Matters

Understanding the interplay between MSR and TDSR is essential for HDB and EC buyers to set realistic budgets before beginning their property search. Cashew's tools calculate both ratios simultaneously, giving you a clear and accurate picture of your borrowing limits from the outset.