TDSR vs MSR in Singapore (2026): Which Rule Actually Limits Your Loan?

Last updated: 13 Mar 2026

Before you step into a showflat or view a resale HDB, you need to know your borrowing limit. In Singapore, the Monetary Authority of Singapore (MAS) enforces strict cooling measures to prevent buyers from over-leveraging on property purchases. The two most critical acronyms you will encounter are TDSR (Total Debt Servicing Ratio) and MSR (Mortgage Servicing Ratio).

Many buyers assume they qualify for a large loan based on their gross salary, only to have their In-Principle Approval (IPA) slashed because of existing car loans or a rigid MSR cap.

Whether you are deciding between an HDB and a new launch condo, this 2026 guide breaks down the difference between TDSR and MSR, the strict "stress test" interest rates banks use, and how to accurately calculate your true borrowing capacity.

1. What is TDSR? (Total Debt Servicing Ratio)

The TDSR framework is the ultimate safety net for property financing. It ensures that a borrower’s total debt obligations do not consume a dangerous percentage of their income.

The Cap: 55% of your gross monthly income.
What it applies to: All property loans (HDBs, Executive Condos, Private Condos, Landed, Commercial).
What counts as "Debt": This includes the new property mortgage you are applying for, plus all existing monthly debt obligations: car loans, personal loans, minimum credit card payments, student loans, and any other outstanding mortgages.

If your total monthly debt payments exceed 55% of your income, the bank will shrink the amount they are willing to lend you for your new home until the ratio falls back into compliance.

2. What is MSR? (Mortgage Servicing Ratio)

The MSR is a much stricter, secondary cap layered on top of TDSR, designed specifically to keep public and subsidized housing highly affordable.

The Cap: 30% of your gross monthly income.
What it applies to: HDB Flats (BTO and Resale) and New Executive Condominiums (ECs) bought directly from developers.
Crucial Exemption: MSR does not apply to Private Condominiums, Landed properties, or Resale ECs.
What counts as "Debt": MSR only looks at the monthly instalment of the property loan you are applying for. It ignores your car loans or credit card debts (though TDSR will still catch those).

The Double Hurdle: If you are buying an HDB flat or a new EC, you must pass both the 30% MSR test and the 55% TDSR test. In almost all cases, the 30% MSR cap is the bottleneck that limits your loan amount.

3. The 2026 Stress Test: The 4.0% Rule

When banks calculate whether you hit the 55% or 30% limits, they do not use the actual advertised interest rate (e.g., 2.8% or 3.2%). To ensure you can still afford your home if interest rates spike in the future, MAS requires banks to apply a "stress test" rate.

For residential property loans in 2026, banks compute your projected monthly mortgage instalment using:

4.0% p.a. OR the prevailing market rate—whichever is higher.

Because of this 4.0% medium-term interest rate floor, the loan amount you qualify for is significantly lower than what a standard online mortgage calculator might tell you. (To understand actual market rates vs. stress test rates, read our Mortgage Rate Guide: Fixed vs Floating).

The Variable Income Haircut

If a portion of your income is variable—such as commissions, freelance income, annual bonuses, or rental income—MAS rules mandate that banks apply a 30% haircut to that variable amount before calculating your TDSR or MSR.

Example: If you earn a fixed base salary of $4,000 and an average monthly commission of $2,000. The bank will only recognize $1,400 of that commission (70% of $2,000). Your recognized gross income for loan assessment is $5,400, not $6,000.

4. Worked Examples: Which Rule Binds You?

Let’s look at how these rules dictate actual purchasing power using two distinct buyer profiles.

Scenario A: Buying an HDB Resale Flat

Profile: A couple earning a combined fixed gross income of $10,000/month. They currently pay $1,500/month for a car loan. They want to buy an HDB resale flat.

Test 1: The MSR (30% Cap)

Maximum allowable mortgage payment: 30% of $10,000 = $3,000/month.
The maximum loan the bank will grant is the amount that results in a $3,000/month payment when calculated at the 4.0% stress test rate.

Test 2: The TDSR (55% Cap)

Maximum allowable total debt: 55% of $10,000 = $5,500/month.
Current car loan: $1,500/month.
Remaining space for mortgage: $5,500 - $1,500 = $4,000/month.

The Result: Even though their TDSR allows for a $4,000 mortgage, the stricter MSR rule caps them at $3,000/month. The MSR is the binding limit here.

Scenario B: Buying a Private Condo

Profile: The exact same couple (Income $10,000, Car loan $1,500) decides to buy a private condo instead.

MSR Check: Not applicable. Private condos are exempt from MSR.
TDSR Check: Still capped at 55%. Total allowable debt is $5,500. Minus the $1,500 car loan, they have $4,000/month available for the new mortgage.

The Result: By switching to a private condo, the couple can secure a significantly larger bank loan (a $4,000/month capacity vs. a $3,000/month capacity), allowing them to target a higher property quantum. However, while they can borrow more, private condos require much higher upfront cash and heavier Buyer's Stamp Duty (BSD).

5. Common Mistakes to Avoid

Ignoring the Car Loan Trap: Car loans are the #1 killer of private property TDSR. A $1,200/month car instalment instantly wipes out $1,200 of your mortgage capacity. If you are planning to upgrade to a condo soon, hold off on buying that new car until after your mortgage is approved and disbursed.
Using Advertised Rates for Calculation: Do not use a 2.9% rate to calculate your affordability. Always use the 4.0% MAS stress test rate to determine your absolute maximum loan quantum.
Forgetting the 30% Haircut on Bonuses: If you rely heavily on end-of-year bonuses to push your income up, remember that banks will slash that bonus average by 30% during their assessment.
Assuming Resale ECs have MSR: A common point of confusion: New ECs bought from developers are subject to the 30% MSR. However, once an EC reaches its 5-year Minimum Occupation Period (MOP) and is sold on the open market, it is classified as a private property, and only the 55% TDSR applies.

6. Your Financing Action Checklist

Before viewing properties or putting down an Option Fee, take these concrete steps to protect your deposit:

Consolidate Debt: List out all minimum monthly payments (credit cards, student loans, car loans).
Clear Short-Term Debt: If you have small outstanding personal loans, pay them off fully to instantly free up TDSR space.
Apply for an IPA: An In-Principle Approval (IPA) is a formal, non-binding document from a bank stating exactly how much they will lend you based on their rigorous TDSR/MSR math. Never sign an Option to Purchase (OTP) without an IPA.
Buffer for Taxes: Ensure your loan calculations leave enough cash liquidity to pay the mandatory upfront stamp duties.

7. Frequently Asked Questions (FAQ)

Q: Can I combine my income with my spouse to pass the TDSR? A: Yes. If you apply for a joint housing loan, the bank will calculate the TDSR and MSR based on your combined gross monthly incomes, and weigh it against your combined monthly debt obligations.

Q: Does CPF contribution count towards my gross income for TDSR/MSR? A: No, only the employee's gross salary (which includes the employee's CPF contribution) is considered. The employer's CPF contribution is strictly excluded from your gross income calculation.

Q: Are renovation loans included in TDSR? A: Yes. Any existing renovation loans you are currently servicing will be factored into your total monthly debt obligations under the 55% TDSR cap.

Q: What happens if interest rates drop below 2% in the future? A: Even if actual market rates drop significantly, MAS still mandates that banks use the 4.0% stress test floor (or prevailing rate, whichever is higher) to ensure you have a safety buffer. Your actual monthly payment will be lower, but your maximum loan eligibility remains capped by the 4.0% test.

Sources

For the exact regulatory definitions and current stress test rates, always consult the official Monetary Authority of Singapore (MAS) and HDB portals.

MAS TDSR/MSR Explainer: MAS official explainer
MAS Loan-to-Value (LTV) Limits: MAS LTV explainer
HDB Buying a Flat: HDB official guide