TDSR Calculator Singapore

What This Singapore TDSR Calculator Does

TDSR stands for Total Debt Servicing Ratio. In practical terms, it asks one question: how much of your gross monthly income is already committed to debt once your assessed home loan instalment is included? This calculator uses a default 55% cap because that is the ratio commonly referenced in Singapore home loan planning. It gives you a fast pass-or-fail estimate without forcing you through a full bank application first.

The output is deliberately simple. Enter your income, current monthly debt payments, the loan amount you want to test, and an assessment interest rate. The tool then estimates your monthly mortgage instalment with a standard amortisation formula, adds it to your existing debts, and compares the total against your chosen TDSR limit. You also get a rough maximum loan estimate using the same assessment rate and tenure so you can see whether the problem is your debt load, your loan size, or both.

Why the Assessment Rate Matters

The biggest mistake borrowers make is testing affordability with a low advertised interest rate rather than the lender's assessment rate. Banks often evaluate housing loans using a stressed rate, not just the rate in the marketing brochure. A loan that looks comfortable at 2.8% can fail once the assessment is run at 4.0% or higher. That is why this page asks for an assessment rate instead of trying to hide the assumption.

If you know the bank's actual stress rate, use it. If not, keep the default for a first-pass check and then rerun the numbers with a more conservative rate. The change is often large enough to shift you from comfortably below the limit to slightly above it, especially for long tenures or large private property loans.

What Usually Counts as Debt

TDSR planning is broader than just the home loan. Existing car loans, student loans, personal loans, credit card obligations, and other recurring debt commitments can all reduce how much room you have left for a mortgage. Income treatment can also vary. Fixed salary is usually straightforward, while variable pay, bonus-heavy compensation, rental income, or self-employed income may be discounted by the lender. This calculator keeps things easy by using a single gross monthly income input, but real underwriting can be stricter.

TDSR vs MSR

TDSR and MSR are not the same test. TDSR looks at your full debt picture. MSR, or Mortgage Servicing Ratio, focuses specifically on the mortgage payment for certain residential property purchases, especially HDB-related cases. Passing TDSR does not automatically mean you pass MSR, and the reverse is also true. Use this tool as a quick front-door filter before you check the property-specific rules that apply to your purchase.

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