Before a Singapore bank approves your home loan, it stress-tests your finances against two MAS rules: TDSR (all debt repayments ≤ 55 % of gross income) and MSR (housing repayment alone ≤ 30 % for HDB flats and EC purchases). Knowing both limits before you shop tells you your real budget — not just the sticker price you can dream about.
You have found a flat, crunched the price, and now you are sitting across from a bank officer who speaks in acronyms. TDSR. MSR. Stressed rate. Haircut. These are not obstacles — they are a precise, public framework that every lender in Singapore must follow, published by the Monetary Authority of Singapore. Once you understand the mechanics, you can calculate your own ceiling before you walk through any door, and you can use levers — clearing a car loan, adding a co-borrower, extending tenure — to push that ceiling higher. This guide walks through the arithmetic step by step, with a worked example you can adapt to your own numbers using the TDSR calculator and the affordability calculator on this site.
What TDSR and MSR actually mean
The Total Debt Servicing Ratio (TDSR) caps your total monthly debt obligations — the new mortgage repayment plus every other outstanding debt (car loans, personal loans, credit-card minimums, other property loans) — at 55 % of your gross monthly income (as of 2026-06). This rule applies to almost all property purchase loans in Singapore — private condo, resale HDB flat, landed house, and commercial property alike.
The Mortgage Servicing Ratio (MSR) is a tighter overlay that applies specifically when you are buying an HDB flat or an Executive Condominium (EC) directly from a developer. It caps the monthly housing loan repayment alone — no other debts — at 30 % of your gross monthly income (as of 2026-06), as set out by HDB’s financing guidelines. Because 30 % is a lower ceiling than 55 %, the MSR almost always binds first for HDB buyers — if the MSR is satisfied, the TDSR is too, unless you carry unusually large other debts.
Both ratios use a stressed interest rate, not the promotional rate on the brochure. Banks are required to compute the monthly repayment at a medium-term floor rate — typically 4 % per annum for private loans (as of 2026-06), though individual banks may apply a slightly higher internal floor. Variable income (commissions, rental, freelance fees) is haircut by 30 % before being counted as qualifying income. This conservatism is deliberate: the framework is designed to ensure you can still service the loan if rates rise or income falls.
- TDSR caps total debt obligations at 55% of gross monthly income for all property loans.
- MSR caps mortgage payments at 30% of gross income — applies only to HDB and EC purchases.
- Existing car loans, credit card debts, and personal loans all reduce your borrowing capacity.
- Banks stress-test at 4% (or higher) interest rate, not your actual rate.
You earn $12,000 a month and want to buy a $2M condo. Can you get the loan? In Singapore, it does not matter how wealthy you feel — the bank is bound by law to check your Total Debt Servicing Ratio (TDSR) and Mortgage Servicing Ratio (MSR). These two ratios determine the absolute maximum you can borrow, regardless of your savings.
This calculator tells you your borrowing limit in seconds — so you can set a realistic budget before falling in love with a property you cannot finance.
What This Calculator Does
How much can you actually borrow? Singapore's TDSR (55%) and MSR (30%) rules determine your maximum loan. Enter your income and existing debts to instantly see the most expensive property you can afford. Essential before you start viewing showflats.
You can find this calculator in the Calculators tab on ShiokNest. It updates results instantly as you adjust inputs — no waiting, no page reloads.
Why This Matters
TDSR and MSR are the legal frameworks that determine how much you can borrow. No amount of savings can override these ratios — they are hardcoded into banking regulations. Understanding your limits before you start property hunting saves you from:
- Falling in love with a property you cannot finance
- Wasting weekends viewing showflats outside your budget
- Discovering at the last minute that your car loan reduces your property budget by $200K
What You Will Discover
After running this calculator with your personal numbers, you will know:
- Your maximum monthly mortgage payment under TDSR (55% of income)
- Your maximum monthly mortgage payment under MSR (30% for HDB/EC)
- The most expensive property you can afford given your income and debts
- How existing debts reduce your borrowing capacity
Key Inputs Explained
Here are the inputs you will configure, along with their default values. Each default is calibrated to a realistic Singapore condo scenario so you can explore results immediately.
| Field | Description | Default Value |
|---|---|---|
| Gross Monthly Income | Your total monthly income before tax. | $12,000 |
| Existing Obligations | Current monthly debt repayments. | $0 |
| Interest Rate (%) | Annual loan interest rate. | 4.0% |
| Loan Tenure (Years) | Duration of the mortgage loan. | 25 years |
| Down Payment (%) | Your cash/CPF contribution as % of price. | 25.0% |
| Property Type | Private property, HDB, or Executive Condo. | Private |
Step-by-Step Guide
- 🏠 Navigate to Calculators — Click the "Calculators" tab in the ShiokNest navigation bar. All 26 calculators are grouped by purpose for easy access.
- 🔍 Select the calculator — Choose "How to Check TDSR and MSR Affordability" from the calculator list. You will see default values already loaded so you can explore immediately.
- ✏️ Enter your values — Replace the defaults with your own numbers. The key fields are:
- Gross Monthly Income — Your total monthly income before tax.
- Existing Obligations — Current monthly debt repayments.
- Interest Rate (%) — Annual loan interest rate.
- Loan Tenure (Years) — Duration of the mortgage loan.
- Down Payment (%) — Your cash/CPF contribution as % of price.
- Plus 1 more fields for fine-tuning your scenario.
- 📊 Review the results — The calculator updates instantly as you change any input. KPI cards show your maximum monthly payment under both TDSR and MSR, plus the maximum property price you can target.
- 🔄 Run what-if scenarios — This is where the real power lies. Change one variable at a time to see its impact. For example, try increasing the interest rate by 1% or extending your holding period by 5 years. Note how the results shift.
- 💾 Compare and decide — Run 2-3 different scenarios and note the results. This gives you a range of outcomes to base your decision on, rather than relying on a single projection.
Worked Example
Meet Daniel, earning $12,000/month gross with no existing debts. He wants to know the most expensive condo he can afford. The bank uses a stress-test rate of 4% (higher than the actual rate) to ensure he can handle rate increases.
How TDSR works: The bank caps Daniel's total monthly debt payments at 55% of his gross income. With $12,000/month income and no debts, he can allocate up to $6,600/month to his mortgage. At the 4% stress-test rate over 25 years, this translates to a maximum loan of approximately $1,250,000.
What if Daniel has a car loan? If he pays $800/month for his car, his maximum mortgage payment drops to $5,800/month, and his maximum property price falls to approximately $1,465,000. That is a reduction of $202,000 in buying power — just from a car loan.
Real-World Scenarios to Try
Here are some realistic scenarios you can plug into the calculator right now. Each one reflects a common situation Singapore property buyers face.
| Scenario | Settings to Try | What You Will Learn |
|---|---|---|
| Single income, no debts | Income: $8K, Obligations: $0 | Baseline borrowing capacity for a solo buyer |
| Single income with car loan | Income: $8K, Obligations: $800 | How a car loan dramatically reduces your property budget |
| Dual-income couple | Income: $18K, Obligations: $0 | The power of combined income — nearly double the property budget |
| High income, multiple debts | Income: $20K, Obligations: $3,000 | How existing debts cap your borrowing even with high income |
Expert Tips and Common Pitfalls
💡 Pro Tips
- Use realistic assumptions — Singapore condo appreciation has historically averaged 2-4% per year. Avoid overly optimistic projections. When in doubt, use 3% as a baseline.
- Include ALL debts — Car loans, credit card minimum payments, study loans, personal loans, and even guarantor obligations count toward TDSR.
- Pay off debts before applying — Clearing a $500/month car payment could increase your maximum property budget by $150K or more.
- Joint income strategy — Co-borrowing with a spouse combines both incomes for TDSR, dramatically increasing your borrowing capacity.
⚠️ Common Pitfalls
- Forgetting credit card limits — Even if you pay your card in full monthly, banks may count 3.5% of your credit limit as a monthly obligation.
- Not accounting for the stress-test rate — The bank uses 4% (or higher), not your actual mortgage rate, when computing TDSR.
🤔 What-If Scenarios to Explore
Get the most value from this calculator by testing these scenarios:
- What if you pay off your car loan first? How much more can you borrow?
- What if you add your spouse as co-borrower? How does combined income change the picture?
- What if you opt for a 30-year tenure instead of 25? Does the maximum property price increase?
- Run at least 3 scenarios — best case, base case, and worst case — to understand the full range of outcomes.
Related Calculators
Your property journey involves many interconnected decisions. These calculators work hand-in-hand with this one:
- How to Use the mortgage calculator
- How to Read the Borrowing Sensitivity Heatmap
Ready to Crunch Your Numbers?
Enter your income and existing debts to instantly see your maximum property budget. This should be the very first calculator you use before viewing any showflat.
Official Sources
This how-to guide is auto-generated using ShiokNest's calculator defaults. All worked examples use default values — adjust inputs to match your personal scenario for accurate results.
Common Mistakes to Avoid
Include ALL debts: car loans, personal loans, renovation loans, student loans, and 3.5% of outstanding credit card balances. Even small debts reduce your borrowing capacity significantly.
TDSR is based on gross monthly income (before tax and CPF deductions). Using net income will understate your actual borrowing capacity.
Even if your actual rate is 2.5%, banks calculate TDSR using at least 4%. This means your effective borrowing capacity is lower than you might expect from the headline rate.
A worked example: from income to maximum price
Consider a buyer with the following profile. Gross monthly salary: S$8,000 (fixed). Monthly car loan repayment: S$800. Monthly credit-card minimum: S$120. No other outstanding loans. The buyer wants to purchase a resale HDB four-room flat.
Step 1 — Compute TDSR headroom. TDSR ceiling = 55 % × S$8,000 = S$4,400. Existing monthly debt = S$800 + S$120 = S$920. Maximum monthly mortgage repayment under TDSR = S$4,400 − S$920 = S$3,480.
Step 2 — Compute MSR headroom. Because this is an HDB flat, the MSR also applies. MSR ceiling = 30 % × S$8,000 = S$2,400. The MSR figure (S$2,400) is lower than the TDSR figure (S$3,480), so MSR is the binding constraint. The maximum housing loan repayment is S$2,400 per month.
Step 3 — Back into the maximum loan quantum. Banks compute the monthly repayment using the stressed rate (assume 4 % p.a.) and the remaining loan tenure. For a 25-year loan, the standard mortgage constant at 4 % is approximately S$5.28 per S$1,000 of loan (as of 2026-06, derived from the standard annuity formula). Maximum loan = S$2,400 ÷ 5.28 × 1,000 ≈ S$454,500 (rounded down).
Step 4 — Derive the maximum purchase price. For a resale HDB flat financed by a bank loan, the Loan-to-Value (LTV) ratio is capped at 75 % of the lower of valuation or purchase price (as of 2026-06). Maximum price = maximum loan ÷ LTV = S$454,500 ÷ 0.75 ≈ S$606,000. The remaining 25 % (roughly S$151,500) must come from cash, CPF Ordinary Account, or a combination. You can check CPF grant eligibility at the CPF Board’s home ownership guide.
To run these numbers against your own income and debt profile, use the TDSR calculator, the affordability calculator, or the mortgage calculator. You can also compare affordability across districts using the District 5 overview as a starting point for Queenstown and Buona Vista pricing benchmarks.
Step by step: computing your affordability ceiling
- List all gross monthly income. Include salary, fixed allowances, and any verified rental or variable income. Apply a 30 % haircut to all variable and rental income before adding it to your qualifying total.
- List all existing monthly debt obligations. Include car loan repayments, personal loan instalments, credit-card minimums (typically 3 % of outstanding balance if no minimum is stated), and repayments on any other property loans you hold.
- Calculate your TDSR ceiling. Multiply total gross qualifying income by 55 % (as of 2026-06). Subtract all existing monthly debts. The remainder is your maximum monthly mortgage repayment under TDSR.
- Apply the MSR ceiling if buying an HDB flat or new EC. Multiply gross qualifying income by 30 % (as of 2026-06). If this figure is lower than the TDSR remainder calculated in step 3, it becomes your binding monthly repayment limit.
- Back into the maximum loan using the stressed rate. Use 4 % p.a. (or your bank’s stated floor, whichever is higher) and your intended tenure. Divide the monthly repayment limit by the mortgage constant for that rate and tenure. Use the mortgage calculator to do this arithmetic instantly.
- Convert the loan quantum to a purchase price. Divide the maximum loan by the applicable LTV: 75 % for first property with no outstanding loan, 45 % for second property, 35 % for third or subsequent (as of 2026-06, per MAS rules). The result is your effective price ceiling before grants.
- Add CPF HDB grants if eligible. CPF Enhanced Housing Grant, Family Grant, and Proximity Housing Grant reduce the effective cash-and-CPF outlay — not the bank loan ceiling — but they meaningfully lower your total acquisition cost. Check current grant tables at HDB’s grant portal.
- Consider levers to raise your ceiling. Clearing a car loan before applying removes that repayment from your existing debt column, directly expanding the mortgage headroom. Adding a co-borrower whose income is included raises the gross qualifying income total, lifting both the TDSR and MSR ceilings. Extending the loan tenure (within the age-cap: loan must be repaid by the younger borrower’s age 65 for most banks, as of 2026-06) reduces the monthly repayment per dollar of loan, raising the maximum loan quantum.
- Verify with at least two banks or a mortgage broker. Individual banks may apply stressed rates above the MAS floor, or apply more conservative haircuts to certain income types. Running the same numbers with two lenders reveals the real range.