TDSR and MSR: How They Limit Your Home Loan (2026)

Two acronyms quietly decide how much a bank will lend you for a home in Singapore, and they can shrink your budget faster than the property price itself. Understanding how they work before you shop saves you from falling for a place you cannot actually finance.

Why these ratios exist at all

Both the Total Debt Servicing Ratio and the Mortgage Servicing Ratio are affordability rules introduced to stop borrowers from taking on more housing debt than their income can comfortably support. They are not there to frustrate you. They are guardrails that protect you from being one interest-rate rise or job change away from trouble, and they protect the wider financial system from a wave of defaults. Once you see them as a personal stress test rather than red tape, they are easier to plan around.

TDSR: the whole-picture limit

The Total Debt Servicing Ratio, or TDSR, is the broader of the two. It looks at the total of all your monthly debt obligations and limits that total to a share of your gross monthly income. Crucially, it does not just count the home loan you are applying for. It also counts your car loan, any personal or education loans, minimum payments on credit cards and revolving credit lines, and other recurring commitments.

This whole-picture approach is why a high salary does not guarantee a big mortgage. If you are already servicing a car and a couple of loans, those obligations consume part of your allowance before the mortgage is even considered. TDSR is set by the Monetary Authority of Singapore and applies to property loans broadly, including loans for private homes. The exact percentage cap is a policy setting that MAS reviews over time, so check the current TDSR threshold on the MAS website rather than assuming an older figure still holds.

MSR: the property-only limit

The Mortgage Servicing Ratio, or MSR, is narrower. It looks only at the instalment for your property loan and caps that single figure at a share of your gross monthly income. It ignores your car loan and other debts entirely. But it does not apply everywhere: MSR is reserved for HDB flats and for Executive Condominiums bought directly from a developer.

Because MSR only counts the mortgage, it can be more forgiving for someone with other debts, but it is also a hard ceiling on the housing portion itself. If you are buying an HDB flat, MSR sits alongside the loan rules we cover in our guide to HDB loan eligibility, and it applies whether you borrow from HDB or a bank. If you are looking at an EC, our Executive Condominium guide explains when the developer-purchase condition puts you inside the MSR net.

When both apply, and which one wins

Here is the part that trips people up. For an HDB flat or a new EC from a developer, both MSR and TDSR can apply at the same time. When that happens, you must satisfy both. Your maximum loan is not the average of the two limits and not the more generous one; it is whichever ratio produces the lower loan.

In practice, MSR often binds first for buyers with little other debt, because it puts a tight cap on the housing instalment. TDSR often binds first for buyers who already carry car or personal loans, because those extra obligations eat into the broader allowance. Either way, the tighter constraint sets your ceiling. For private property, only TDSR applies, so there is a single hurdle rather than two.

Feature	TDSR	MSR
What it counts	All monthly debt plus the new mortgage	Only the property-loan instalment
Where it applies	Property loans broadly, including private homes	HDB flats and ECs bought from a developer
Set by	MAS	MAS and HDB
Typical effect	Bites when you have other loans	Bites when the mortgage itself is large

What actually goes into the calculation

For TDSR, the lender totals your recurring monthly debt: the proposed mortgage instalment, car loans, student and personal loans, and minimum payments on credit facilities. Guarantor obligations can be counted too. The way variable income such as bonuses, commissions and rental income is treated is subject to haircuts and rules that can change, so it is worth confirming the current approach with MAS or your bank.

For MSR, the calculation is simpler because only the mortgage instalment is measured, but the loan tenure and the assessment interest rate the bank uses will shape the result. A shorter tenure pushes the monthly instalment up, which can breach MSR even when the loan amount looks reasonable. Refinancing later can also re-trigger these servicing checks, so the ratios matter well beyond your first application.

How to plan around them

The most effective lever is reducing other debt before you apply, because clearing a car or personal loan can free up a surprising amount of TDSR headroom. Lengthening the loan tenure lowers the monthly instalment and eases both ratios, though it must fit within age and tenure limits and increases total interest paid. Making a larger downpayment shrinks the loan and therefore the instalment. And getting a proper in-principle assessment before you commit means you shop with a real number, not a hopeful one. If you are stretching to a second home, our guide to buying a second property in Singapore shows how these ratios tighten further.

How the assessment interest rate changes the picture

One detail catches many buyers off guard: banks do not size your loan using the promotional interest rate you are quoted at signing. For the purpose of the servicing checks, they apply a stress-test interest rate, a deliberately higher notional rate, to work out what your instalment would be if rates rose. That protects you from being fine today but crushed by a rate increase tomorrow.

The consequence is that the loan you qualify for under TDSR and MSR is smaller than a simple calculation on today’s cheap rate would suggest. If you want to understand how the rate you actually pay can move over the life of the loan, our comparison of fixed versus floating home loans in Singapore explains the two paths and why the stress test exists in the first place.

A worked way to think about it

Imagine two buyers with identical incomes eyeing the same flat. The first has no other loans, so TDSR gives them plenty of room, but MSR caps the housing instalment and becomes their binding limit. The second is still paying off a car and a renovation loan, so those obligations eat into their TDSR allowance and it is TDSR, not MSR, that sets their ceiling. Same flat, same salary, two different maximum loans, purely because of what sits on each person’s debt profile. Seeing your own position through this lens tells you which lever, cutting debt or adjusting tenure and downpayment, will actually move your number.

The bottom line

TDSR and MSR are the two gates every home loan in Singapore has to pass through. TDSR weighs all your debts against your income and applies broadly, while MSR weighs only the mortgage and applies to HDB flats and developer-sold ECs. Where both apply, the stricter one sets your ceiling. Because the exact caps are policy settings that MAS and HDB adjust, always verify the current figures before you budget, and trim other debt to give yourself room. To translate these limits into a realistic shortlist of homes you can finance, get matched with a licensed property agent below.

Related guides: The Home Protection Scheme (HPS), Explained (2026)