If you are working out how much you can borrow to buy a home here, the two rules that shape the answer are TDSR and MSR. Understanding tdsr msr singapore lending caps early saves a lot of disappointment, because they decide the size of loan a bank or HDB will actually approve, regardless of the price tag you have set your heart on. Both are affordability guardrails set by the Monetary Authority of Singapore (MAS) and applied by lenders, and both are calculated from your income and your existing debts. This article is general information to help you plan, not personalised financial advice, so confirm the current rules and ratios with MAS, the HDB or your bank before you commit.
The short version is this. The Total Debt Servicing Ratio (TDSR) looks at all your monthly debt obligations together. The Mortgage Servicing Ratio (MSR) looks only at your home loan repayment, and it applies to certain property types. Most buyers need to clear both tests at once.
What TDSR Actually Measures
TDSR caps the share of your gross monthly income that can go toward servicing all of your debts combined. That means it counts far more than the new home loan you are applying for. Car loans, personal loans, student loans, credit card balances, renovation loans and any other property mortgages all sit inside the same calculation. If you are already carrying meaningful monthly commitments, they eat directly into the room you have for a mortgage.
Because it is a total-debt test, TDSR is the rule that most often surprises buyers. Someone with a healthy salary but a large car loan and revolving card balances can find their borrowing capacity smaller than expected. The practical lesson is to reduce or clear other debts well before you apply, since a cleaner debt profile frees up the ratio for the loan you actually want.
TDSR applies broadly across property purchases and refinancing, so it is the baseline test almost every buyer meets. Check the current TDSR threshold on the MAS website, as the exact percentage cap is a figure that can be reviewed over time.
What MSR Adds On Top
MSR is narrower. It looks only at the monthly repayment of your property loan and caps that against your gross monthly income. Crucially, MSR does not apply to every purchase. It is targeted at HDB flats and executive condominiums bought from a developer, the segment where the authorities want to keep repayments comfortably within reach for public-housing buyers.
Where MSR applies, you must satisfy both MSR and TDSR, and the binding constraint is whichever gives the smaller loan. For a private condominium or a resale EC past its restriction period, MSR generally does not apply, and TDSR alone governs. This is why the same borrower can qualify for different loan sizes depending on the type of home being bought. Confirm the current MSR cap and which property types it covers with the HDB or MAS, since these details are periodically adjusted.
How Lenders Assess Your Income
Neither ratio is applied to your take-home pay in a simple way. Lenders assess your income according to rules that can trim the figure they are willing to count. Fixed monthly salary is treated most favourably. Variable income such as bonuses, commissions and rental income is usually discounted before it enters the calculation, because it is less certain. Self-employed and freelance income is typically averaged and haircut as well.
There is a further wrinkle for borrowers who lean on non-salary income or who are older. Lenders apply an assumed interest rate for the affordability stress test rather than the actual promotional rate, so your loan is sized against a higher notional repayment. Loan tenure limits and your age at the end of the loan also feed in. All of this means the loan you qualify for is often smaller than a naive “salary times a multiple” guess. Ask your banker exactly how they will treat each income source before you rely on it.
TDSR Versus MSR at a Glance
The table below sets the two rules side by side so you can see where each one bites. Treat the descriptions as directional, and verify the live figures and scope with the relevant authority.
| Feature | TDSR | MSR |
|---|---|---|
| What it counts | All monthly debt obligations combined | Only the property loan repayment |
| Applies to | Most property purchases and refinancing | HDB flats and ECs bought from a developer |
| Purpose | Overall debt prudence | Keeping housing repayments affordable |
| Effect of other loans | Reduces available headroom | Not directly affected |
| Which usually binds | Governs private property alone | Often the tighter test for eligible HDB and EC buyers |
Worked Thinking, Without the Numbers
Imagine two buyers on similar salaries. The first has no other debt and is eyeing a private condo. Only TDSR applies, and with a clean debt slate they have the full headroom the ratio allows. The second buyer wants a new EC from a developer and is still paying off a car. They must pass MSR, which is stricter for that property type, and their car loan simultaneously shrinks their TDSR room. Same income, very different approved loans.
That contrast is the heart of the matter. Your borrowing power is not a fixed number attached to your salary. It flexes with the property type, your other commitments, how your income is structured, and the assessment rate the lender uses. Getting pre-approval, known as In-Principle Approval, before you shop tells you the real ceiling rather than a hopeful one.
Practical Steps Before You Apply
A few habits meaningfully improve the loan you can secure. Clear or reduce revolving credit card balances and unsecured loans, since these weigh heavily on TDSR. Avoid taking a new car loan in the months before a mortgage application. If your income is bonus-heavy or self-employed, keep clean records so lenders can average it fairly. Consider whether a co-borrower with steady salaried income can lift the combined assessed figure, keeping in mind the joint responsibilities that creates.
Finally, remember these ratios interact with other rules you will meet, including loan-to-value limits and stamp duties. Model the whole picture, not just the monthly repayment, and always run your plan against the current official figures before you sign anything.
Explore more
For the companion caps on how much of the price you can finance, read our guide to Loan-to-Value limits in Singapore. To compare where your mortgage might come from, see HDB loan versus bank loan and the broader home loan options in Singapore. If you plan to use retirement savings for the purchase, our guide on using CPF to buy a home pairs well with these rules.