Key Takeaways:
TDSR (Total Debt Servicing Ratio) caps all your monthly debt repayments at 55% of gross monthly income — this applies to every property loan in Singapore, HDB or private.
MSR (Mortgage Servicing Ratio) adds a tighter rule for HDB flats and ECs: your home loan repayment alone cannot exceed 30% of gross monthly income.
For an HDB purchase, both limits apply simultaneously — MSR is almost always the binding constraint.
On a combined household income of $10,000/month, MSR limits your monthly HDB repayment to $3,000 — which translates to a loan of roughly $530,000–$560,000 depending on tenure and rate.
A higher income does not automatically mean a larger loan — existing debts (car loans, personal loans, outstanding credit card balances) directly reduce your borrowing headroom under TDSR.
HDB loans use an interest rate of 2.6% (pegged to CPF OA rate + 0.1%) for stress-testing; bank loans use a stress-test rate typically around 4.0–4.5%.
Understanding both limits before you start flat-hunting is not a formality — it determines your actual price range, not the one you hope for.
Most People Get This Wrong Before They Even Start Looking
Here is what happens more often than it should: a couple spends three weekends shortlisting HDB resale flats, falls in love with a unit, submits an offer — and then discovers the bank will not lend them what they need. The deal falls through. The option fee is at risk. The stress is real.
The TDSR and MSR framework is not bureaucratic fine print. It is the single most important set of numbers governing how much house you can actually afford in Singapore, and understanding it before you start viewing — not after — is what separates a confident buyer from one who is constantly recalibrating expectations mid-search.
This post breaks both frameworks down with real numbers, plain logic, and honest trade-offs.
TDSR MSR Explained: What Each Rule Actually Does
TDSR — the universal ceiling
The Total Debt Servicing Ratio caps the total of all your monthly debt repayments at 55% of your gross monthly income. This includes your home loan, car loan, student loan, personal loan, and any outstanding credit card debt (typically computed at 5% of the outstanding balance per month). It applies to every property loan in Singapore — HDB, executive condo, or private residential.
If you earn $8,000 per month gross, your TDSR ceiling is $4,400 per month across all debts combined. If you are already paying $800 a month on a car loan, your effective home loan headroom under TDSR drops to $3,600 per month — not $4,400.
MSR — the tighter HDB-specific rule
The Mortgage Servicing Ratio applies only to HDB flats and executive condominiums purchased directly from developers. It restricts your home loan repayment to 30% of gross monthly income — regardless of how much headroom you have left under TDSR.
On the same $8,000 income, your MSR ceiling is $2,400 per month, which is your binding constraint for an HDB loan — not the $3,600 available under TDSR. Both rules apply simultaneously, but for most HDB buyers, MSR is the one that actually limits the loan.
Why this matters in one sentence: TDSR governs the total debt picture; MSR governs the home loan specifically. For HDB buyers, MSR almost always bites first.
The Real Numbers: What Can You Borrow?
The table below shows approximate maximum HDB loan amounts based on household income, assuming a 25-year loan tenure and a 2.6% stress-test rate (HDB concessionary loan) or 4.0% (bank loan). No existing debts are assumed — your actual figure will be lower if you carry a car loan or any other outstanding credit.
Combined Monthly Income | MSR Ceiling (30%) | Max HDB Loan (HDB rate, 25yr) | Max HDB Loan (Bank, 25yr) |
|---|---|---|---|
$6,000 | $1,800/month | ~$320,000 | ~$285,000 |
$8,000 | $2,400/month | ~$425,000 | ~$380,000 |
$10,000 | $3,000/month | ~$530,000 | ~$475,000 |
$12,000 | $3,600/month | ~$640,000 | ~$570,000 |
$14,000 | $4,200/month | ~$745,000 | ~$665,000 |
Note: EC income ceiling is $16,000/month. MSR applies to ECs purchased from developers; once privatised at the 10-year mark, it no longer applies on resale.
These numbers assume a clean debt profile. A $1,200/month car loan on a $10,000 household income does not just reduce your TDSR headroom — it effectively pushes your usable borrowing capacity below what the MSR alone would allow, because TDSR becomes the binding constraint instead.
HDB Loan vs Bank Loan: How the Stress-Test Difference Affects Your Limit
This is where many buyers are surprised. The loan amount you qualify for is not simply a function of your income — it is also shaped by the interest rate used to stress-test the repayment.
HDB concessionary loans use 2.6% (the CPF OA rate of 2.5% plus 0.1%). Because this rate is lower, the computed monthly repayment on a given loan quantum is smaller, meaning you qualify for a larger loan amount within the same MSR ceiling.
Bank loans are stress-tested at rates typically between 4.0% and 4.5% — reflecting a buffer above prevailing market rates. The higher stress-test rate produces a larger computed monthly repayment for the same loan amount, which means a lower qualifying loan quantum under MSR.
In practical terms: on a $10,000 household income with a $3,000 MSR ceiling, the HDB loan might support ~$530,000 in borrowing while a bank loan at the same income may only support ~$475,000. The gap matters in a market where Queenstown 4-room resale medians are $820,000 and even Woodlands has crossed $546,000.
Both HDB and bank loans share an LTV ceiling of 75%, meaning you need at least 25% of the purchase price covered by cash and/or CPF before the loan kicks in. For bank loans, at least 5% of that 25% must be in cash. These down payment requirements interact directly with your CPF balance and cash savings — and need to be mapped out before you commit to a price range.
How Existing Debts Quietly Shrink Your Borrowing Power
Most buyers focus on their income when estimating how much they can borrow. Fewer think carefully about what their existing debts do to that number. Here is a concrete example.
Household income: $10,000/month TDSR ceiling: $5,500/month (55%) MSR ceiling: $3,000/month (30%) Car loan repayment: $1,200/month Personal loan repayment: $400/month
Under TDSR: available home loan repayment = $5,500 − $1,200 − $400 = $3,900/month Under MSR: home loan repayment capped at $3,000/month regardless
MSR is still the binding constraint here, so the home loan limit stays at ~$530,000. But now consider the same household with a higher car loan:
Car loan repayment: $1,800/month Personal loan repayment: $400/month
Under TDSR: available home loan repayment = $5,500 − $1,800 − $400 = $3,300/month Under MSR: still capped at $3,000/month
TDSR is now tighter — and since $3,000 (MSR) versus $3,300 (TDSR headroom) are close, any further debt tips TDSR into the binding position. At $2,100 in monthly debt repayments, TDSR overrides MSR and your home loan repayment ceiling falls to $3,400 — below $3,000 is impossible from either direction without clearing debt first.
If you are carrying significant debt and planning to buy an HDB flat, the most effective move before applying for a loan is often not saving more — it is paying down what you already owe.
What This Means If You Are Planning to Upgrade
For HDB owners thinking about the move to private property, understanding TDSR MSR explained in full is essential — because MSR drops out of the equation entirely once you cross into the private market. Only TDSR applies to private residential loans.
This changes the borrowing calculus meaningfully. A household that was limited to $530,000 under MSR at $10,000 income may qualify for significantly more under TDSR alone for a condo purchase — subject to ABSD planning and whether they sell the HDB first or hold it. Before you run those numbers in your head, check your flat's current market value at homevalue.nexdoor.sg — knowing what you are likely to net from the sale, after CPF accrued interest refunds, is the starting point for any credible upgrade plan.
One often-missed detail: if you are buying private while still holding your HDB, the 55% TDSR applies to the combined repayments on both loans. That means your HDB loan repayment, even if it feels comfortable in isolation, reduces the headroom available for your private property loan. Sequencing matters enormously here.
The Honest Answer
TDSR and MSR are not obstacles invented to frustrate buyers — they are the framework that prevents you from overextending on the most significant financial commitment most Singaporeans will ever make. Understanding them honestly means accepting that your real borrowing limit may be different from the number in your head, and that the gap is worth knowing before you start making offers.
The practical takeaway is simple: before you shortlist a single flat or condo, run your own TDSR and MSR calculation with your actual income, your actual debts, and the actual stress-test rate for whichever loan type you are considering. The numbers take twenty minutes to work through and can save you from months of misaligned expectations — or worse, a deal that falls apart at the financing stage.
Income is what lenders see. Debts, down payment capacity, and CPF position are what actually determine your range. Know all four before you start.
Ask NexDoor! Have a specific block, flat, or area in mind — or just not sure if the numbers work for your situation? Our consultants — Dave (HDB & North region), Bjorn (data & resale analysis), and Abigail (strategy & positioning) — will walk you through everything before you make any moves. No guesswork, just clarity.
Data references MAS guidelines, HDB financing terms, and CPF Board rates as of 2025. This post is for informational purposes only and does not constitute financial or investment advice. Consult a licensed financial adviser or mortgage broker before making borrowing decisions.
Sources:
Monetary Authority of Singapore — TDSR and property loan guidelines: mas.gov.sg
HDB — Housing Loan Terms and Conditions: hdb.gov.sg
CPF Board — Ordinary Account interest rates and housing usage: cpf.gov.sg