Singapore has two separate debt servicing ratio limits for property loans. The TDSR applies to all property purchases. The MSR — Mortgage Servicing Ratio — applies specifically to HDB flat purchases and executive condominiums within the first five years after completion.
What The MSR Is
The MSR caps the monthly repayment on a housing loan at 30% of the borrower's gross monthly income — specifically for HDB flat purchases. If your gross household income is $10,000 per month, your monthly HDB loan repayment cannot exceed $3,000, regardless of what your TDSR headroom would technically allow.
Why This Is Relevant For Upgraders
When you sell your HDB and buy a private property, you move from the MSR framework to the TDSR-only framework. This is one of the financial reasons private property ownership can sometimes feel more flexible — the loan qualification framework is less restrictive. For a family whose HDB monthly repayment was limited by MSR, the shift to TDSR may actually increase their qualifying loan quantum.