Before you fall in love with a flat or a condo, it helps to know a plainer number: how much a bank or HDB will actually lend you. In Singapore, that ceiling is shaped by two rules, the Total Debt Servicing Ratio and the Mortgage Servicing Ratio. Understanding TDSR in Singapore, and where MSR fits in, turns a vague worry into a figure you can plan around. This is general information, not financial advice, so treat it as a map rather than a quote.
What TDSR Actually Means
TDSR stands for Total Debt Servicing Ratio. It is a framework from the Monetary Authority of Singapore that limits how much of your gross monthly income can go towards all your debt repayments combined. That includes your prospective home loan, but also car loans, personal loans, student loans, credit card balances and any other property mortgage you already service.
The idea is protective rather than punitive. By capping total repayments as a share of income, the rule is designed to stop buyers overstretching if interest rates climb or income dips. When a bank assesses you, it adds up every monthly obligation, applies a stress interest rate to your new loan so the sums still work if rates rise, and checks that the total sits within the allowed share of your income.
The exact TDSR percentage threshold, and the stress rate banks must use, are set by MAS and reviewed from time to time, so do not treat any figure you read online as fixed. Always check the current TDSR limit on the MAS website or ask your bank before you rely on it.
How MSR Differs and When It Applies
The Mortgage Servicing Ratio is a second, tighter rule that applies only to certain purchases. MSR limits how much of your gross monthly income can go towards your property loan alone, ignoring your other debts. Crucially, it applies only to HDB flats and to Executive Condominiums bought from the developer, not to resale private condos or landed homes.
Where MSR applies, both rules are checked and the stricter outcome wins. Because MSR looks only at the housing loan and sits at a lower share than TDSR, it is often the binding limit for HDB and new EC buyers. For a private resale condo, MSR does not apply at all, so TDSR alone governs how much you can borrow.
As with TDSR, the MSR percentage is set by the authorities and can change. Check the current figure with HDB, MAS or your bank rather than assuming.
TDSR and MSR at a Glance
The table below compares the two rules in general terms. It describes how each works, not the specific percentages, which you should confirm against the current official figures.
| Feature | TDSR | MSR |
|---|---|---|
| What it caps | All monthly debt repayments combined | Only the property loan repayment |
| Applies to | Most property loans, including private homes | HDB flats and new ECs from the developer |
| Debts counted | Home loan plus car, personal, credit and other loans | Housing loan only |
| Typical role | The broad ceiling for most buyers | Often the tighter, binding limit where it applies |
| Where to verify | MAS and your bank | HDB, MAS and your bank |
What Counts as Income and Debt
Two buyers on the same salary can qualify for very different amounts, because the rules look closely at the make-up of your income and obligations.
On the income side, a fixed monthly salary is usually taken at full value. Variable income such as bonuses, commissions, rental income or self-employed earnings is typically recognised at a reduced rate, because it is less certain. If a large slice of your pay is variable, expect the assessed figure to be lower than your headline income.
On the debt side, every recurring repayment counts. A car loan, a renovation loan, a study loan or even a run of minimum credit card payments all eat into your available headroom. Guarantor obligations can count too. This is why clearing or reducing other debts before applying often lifts how much you can borrow more than a small pay rise would.
Because these treatments change and vary by lender, ask your bank exactly how it will assess your particular income mix.
Steps to Estimate and Strengthen Your Position
You do not need a spreadsheet to get a rough sense of where you stand. A calm, orderly approach works well.
- List your gross monthly income, separating fixed pay from variable earnings.
- Add up every existing monthly debt repayment you are committed to.
- Note the loan tenure and remember that a longer tenure lowers monthly repayments but usually costs more in total interest, and age limits apply.
- Use a bank or HDB online calculator, or ask a mortgage adviser, to translate this into an indicative loan amount under current rules.
- Get an Approval in Principle or HDB Loan Eligibility letter before you commit, so you shop within a confirmed budget.
To strengthen your position, consider paying down high commitments, avoiding new big-ticket loans in the months before applying, and keeping credit card balances low. Small housekeeping steps can meaningfully change the number a lender is willing to offer.
Who These Rules Affect Most
TDSR and MSR touch nearly every buyer, but they bite hardest in a few situations. Buyers with existing car or personal loans feel TDSR most, because those repayments crowd out the housing budget. Self-employed people and those on heavy commission see the biggest gap between their real earnings and their assessed income. Older buyers face shorter maximum tenures, which raises the monthly repayment for any given loan size.
None of this is a verdict on whether you should buy now. Timing a purchase is a personal decision about your job, family plans and savings buffer, not something to pin on a market forecast. What the rules give you is discipline: a borrowing ceiling that keeps repayments sustainable through the ups and downs.
When you are ready to firm up numbers, speak to your bank, HDB or a licensed mortgage adviser, and if you engage an agent, use a CEA-registered one and verify them on the CEA Public Register. Treat every percentage you read as something to confirm at the source, because these rules are updated over time.
Explore more
Once you know your ceiling, see how the money flows out over the years in understanding your mortgage repayments and weigh your rate options in fixed versus floating home loan rates. To pair this with your cash and CPF planning, read loan-to-value limits and down payments.
Related across Sky Media: TDSR and MSR Explained for Singapore Home Loans