TDSR & MSR Explained — Loan Limits for Singapore Property Buyers

What Is TDSR?

A software engineer earning S$8,000 a month in gross income qualifies for a maximum private home loan of S$921,900 under the Total Debt Servicing Ratio (TDSR). The same income buying a resale HDB flat instead caps out at S$454,700 — less than half — because a second ratio, the Mortgage Servicing Ratio (MSR), takes over. Two ceilings, one income, two very different outcomes. (as of 2026-07)

TDSR limits the sum of ALL your monthly debt repayments — the new mortgage plus any car loan, personal loan, student loan, credit card minimum, and guarantor obligations — to 55% of your gross monthly income. It applies to every property loan type: HDB, Executive Condominium (EC), and private condo, whenever the loan is granted by a bank or other financial institution. The Monetary Authority of Singapore (MAS) introduced TDSR in June 2013 under MAS Notice 645 — Property Loan Rules, after a six-year property bull run pushed household debt to levels the central bank judged unsustainable. The framework has been revised several times since, most recently as part of the September 2022 cooling measures.

Crucially, TDSR is not calculated against your actual mortgage rate. Banks apply a medium-term stress-test rate of 4.0% (as of 2026-07) to work out the hypothetical monthly instalment on the loan quantum you're requesting — even if your bank is currently quoting a lower floating or fixed rate. This protects both you and the bank against future rate increases, and it also means your maximum loan is smaller than what your current mortgage rate alone would suggest.

TDSR = total monthly debt obligations ÷ gross monthly income ≤ 55%

What Is MSR?

MSR predates TDSR by five months — MAS introduced it in January 2013 specifically to contain debt levels on subsidised public housing, with the rules set out in MAS FAQs on MSR. MSR caps your total mortgage instalment (this new loan only, not other debts) at 30% of gross monthly income, and it applies only to HDB flats and Executive Condominiums bought directly from a developer — not to private condos, and not to resale ECs past the 10-year privatisation mark, which by then sit outside HDB's financing rules entirely. (as of 2026-07)

When both ratios apply — which happens for every HDB and new EC purchase — the bank works out your eligible loan under EACH ratio separately and lends against whichever produces the lower figure. Because MSR only counts the new mortgage while TDSR counts every debt you carry, MSR is the binding constraint for most HDB and EC buyers with no other loans, while TDSR becomes binding once existing debts — a car loan, an outstanding personal loan — eat into the 55% ceiling.

For an HDB or EC purchase, always check both figures against the TDSR and MSR calculator before you set a budget with your agent — the lower of the two figures, not the higher, is what the bank will actually lend. Our companion guide on how MSR applies specifically to HDB buyers walks through the full HDB-specific mechanics.

How Banks Calculate TDSR

Every bank runs the same five-step sequence when you submit a home loan application, even though the underlying software differs from lender to lender.

1. Step 1 — Verify gross monthly income. For salaried applicants this is the average of the last 3-12 months' payslips plus CPF contribution history; for variable and self-employed income it draws on IRAS Notice of Assessment (NOA) history (see Section 3).
2. Step 2 — Apply haircuts to variable income. Bonus, commission, rental, and self-employed income are not counted at full value — see Section 4 for how this works.
3. Step 3 — Total existing monthly debt obligations. Every car loan instalment, personal loan repayment, credit card minimum payment, renovation loan, and any loan you've guaranteed for someone else is added up.
4. Step 4 — Compute available debt-servicing headroom. Gross monthly income (after haircuts) × 55% minus existing debt obligations equals the maximum monthly instalment the new mortgage is allowed to carry.
5. Step 5 — Stress-test at 4.0% to back into the loan quantum. The bank runs that maximum instalment through an amortisation formula at the 4.0% medium-term rate (as of 2026-07) and your chosen or maximum allowable tenure, and the result is your maximum loan.

Run your own numbers through the mortgage repayment calculator before you approach a bank, so the instalment estimate you walk in with already reflects the stress-tested rate rather than today's promotional rate.

Income Types & Documentation

The paperwork a bank asks for depends entirely on how your income arrives, and mismatched documentation is the single biggest cause of delayed loan approvals.

Salaried employees submit the latest computerised payslips, CPF contribution history (pulled via the CPF Board's e-services), and sometimes an employment letter confirming basic pay versus variable pay. Self-employed applicants and commission-based agents instead rely on two years of IRAS Notice of Assessment (NOA) — the bank averages the two years' assessable income rather than taking a single year's figure, which smooths out one abnormally strong or weak year.

Rental income from an existing investment property needs the tenancy agreement plus recent bank statements showing the rent actually being received — a signed lease alone is not enough. Joint applicants and guarantors each submit their own full income documentation, since TDSR is assessed on the combined household application, not just the primary borrower.

Gaps or inconsistencies here don't just slow things down — a bank that can't verify a claimed income stream will exclude it from your TDSR calculation entirely, which can silently shrink your approved loan quantum well below what you expected. MAS Notice 645 sets out the documentation standards banks must follow; MAS's property loan rules and notices is the definitive reference if your bank's requirements seem unusual.

Variable Income Treatment

Bonus, commission, rental, and self-employed income are all real money, but banks don't count them the same way they count a fixed salary — each is discounted before it enters the TDSR formula, because MAS requires lenders to build in a buffer against income that can disappear in a downturn. The exact discount (haircut) applied varies by bank and by income type, so it is not a single published percentage across the industry — ask your bank's mortgage specialist for the specific figure they will use on your application.

What is consistent across banks is the documentation trail: variable income needs a track record — multiple years of IRAS NOAs or CPF contribution statements — before a bank will recognise it at all. A bonus paid for the first time this year, or rental income from a tenancy that only just started, will not be counted; the bank wants to see the income repeat before it lends against it.

If bonus income makes up a meaningful share of your total pay — common for bankers, insurance agents, and sales roles — our companion guide on using bonus and commission income in your TDSR application walks through how to document and present it to maximise what the bank will recognise.

The practical takeaway: never budget your maximum loan quantum against your gross pay-with-bonus figure. Run the affordability calculator using only your base salary first, then treat any bonus-linked uplift as an addition to your borrowing capacity — not the baseline.

Strategies to Improve TDSR

If your calculated maximum loan falls short of the property you want, five levers actually move the number — and they are not all equally practical.

• Pay down or close existing debt. Clearing a car loan or a large credit card balance before applying immediately frees up monthly headroom under the 55% cap — this is the fastest lever because it takes effect the moment the debt is settled.
• Add a co-borrower with income. A spouse, parent, or child added to the loan (not just the property title) brings their income into the combined TDSR calculation, which can materially raise the loan quantum — but they become jointly liable for the debt.
• Extend the loan tenure. A longer tenure lowers the stress-tested monthly instalment for the same loan quantum, up to the 30-year cap for private property (25 years for HDB) and subject to the loan ending by age 65 for maximum LTV (see Section 6).
• Restructure via decoupling. For couples where one partner has significant income headroom, transferring full ownership to that partner can reset the debt calculation — though it triggers its own stamp duty and legal costs that must be weighed against the TDSR gain.
• Build a documented income track record. Since variable income needs history to be recognised (Section 4), timing your application after a second or third year of consistent bonus or rental income can unlock recognition that was not available a year earlier.

TDSR Exemptions & Special Cases

TDSR is not universal — a handful of structural exceptions and special cases change how it applies.

HDB concessionary loans sit outside TDSR. Because the HDB Housing Loan (HFE) is granted by HDB itself rather than a bank or other financial institution, TDSR does not apply to it at all — only MSR (30%) governs eligibility, computed against the HDB concessionary interest rate of 2.6% p.a. (as of 2026-07) rather than the 4.0% stress-test rate banks use. This is one reason an HDB loan can qualify a buyer who would fall short under a bank loan's TDSR test.

Age caps your effective tenure. To qualify for the maximum 75% Loan-to-Value (LTV) ratio, your loan tenure must end by age 65 — a 50-year-old applicant is therefore capped at a 15-year private loan tenure regardless of the 30-year maximum, which raises the stress-tested monthly instalment and shrinks the maximum loan quantum accordingly. Buyers past their mid-40s should run the numbers at their actual available tenure, not the headline 30-year figure.

Refinancing an owner-occupied property follows a separate assessment path since no new property is changing hands, but the exact treatment depends on your bank and loan structure — confirm directly with your lender rather than assuming standard purchase-TDSR rules apply unchanged.

None of these carve-outs remove the underlying affordability math — they shift which formula and which rate apply. HDB's housing loan eligibility rules is the authoritative source for HFE-specific treatment.

Impact on Borrowing Capacity

The clearest way to see how much these two ratios matter is to run the same income through both.

Worked example. Take a buyer earning S$8,000 gross monthly income with no existing debt, assessed at the 4.0% medium-term stress rate (as of 2026-07). Under TDSR alone (55% cap, private property, 30-year tenure), the maximum monthly instalment is S$4,400, which amortises to a maximum loan of S$921,900. The same buyer purchasing an HDB flat instead is capped by MSR (30%, 25-year tenure): a maximum monthly instalment of S$2,400 amortises to a maximum loan of S$454,700 — less than half the private-property figure, for an identical income.

Layer on the Loan-to-Value ratio and the picture completes itself: at 75% LTV for a first private housing loan, that S$921,900 loan supports a purchase price of S$1,229,200, with the remaining 25% due as down payment (at least 5% in cash). Loan quantum is only half the budget — Buyer's Stamp Duty, any Additional Buyer's Stamp Duty, and legal fees are all due in cash or CPF on top of the down payment; run your own income and debts through the calculators referenced throughout this guide before committing to a price range, and see IRAS's stamp duty calculators and guidance for that side of the ledger.