Understanding the Total Debt Servicing Ratio (TDSR) framework is essential when financing property in Singapore. Enforced by the Monetary Authority of Singapore (MAS), TDSR caps the total amount of debt you can take on relative to your gross income, ensuring long-term financial stability.
1. What is the TDSR Framework?
TDSR sets a strict limit on how much of your monthly income can go toward servicing debt obligations:
$$\text{TDSR} = \left( \frac{\text{Total Monthly Debt Repayments}}{\text{Gross Monthly Income}} \right) \times 100\% \le 55\%$$
- The 55% Cap: Your total monthly debt repayments—including mortgages, car loans, credit card balances, and personal loans—cannot exceed 55% of your gross monthly income.
- All Property Types: Applies across HDB flats, Executive Condominiums (ECs), and private residential properties.
2. How Debt and Income Are Calculated
To determine your borrowing limit, financial institutions evaluate all recurring financial commitments alongside your income stability:
- Included Liabilities: Mortgage payments (new and existing), car installment plans, minimum credit card payments, personal/renovation loans, and student loans.
- Variable Income Haircut (30%): If your income includes commissions, performance bonuses, allowances, or rental income, banks apply a 30% haircut—counting only 70% of that variable component toward your recognized income.
- Self-Employed Individuals: Income is assessed using the average of your last two years’ Notice of Assessment (NOA), also subjected to the standard 30% discount.
3. The 4% Stress Test Rate
When computing your monthly mortgage obligations under TDSR, financial institutions do not use prevailing promotional interest rates. Instead, they apply a stress-test rate:
- Residential Rate Floor: Calculated at 4.0% per annum (or the actual contracted thereafter rate, whichever is higher).
- Purpose: Ensures you can maintain loan servicing even if global interest rates rise significantly during your loan tenure.
4. Strategies to Boost Borrowing Eligibility
If your current commitments push you close to or above the 55% threshold, consider these steps to optimize your TDSR capacity:
- Pay Off High-Impact Debts: Clear short-term liabilities (like car loans or personal line credit) to immediately free up monthly debt allocation.
- Pledge Financial Assets: Pledging fixed deposits or liquid securities with the lending bank increases your recognized income base.
- Extend Loan Tenure: Selecting a longer tenure reduces individual monthly installments (subject to age limits and property caps).
- Add a Co-Borrower: Combining income with a spouse or immediate family member raises the overall household income ceiling.
5. Common Pitfalls to Avoid
- Taking On New Debt Mid-Application: Avoid buying a new car or taking out personal loans right before or during your mortgage application.
- Overlooking Income-Weighted Average Age (IWAA): Adding older co-borrowers reduces the maximum allowable loan tenure, which increases monthly payments and impacts your TDSR calculation.
- Unused Revolving Lines: Leaving large credit card limits or credit lines open can sometimes weigh on bank assessments.
Quick Reference Guide
| Component | 2026 TDSR Rule / Standard |
| Maximum TDSR Cap | 55% of Gross Monthly Income |
| Residential Stress Test Rate | 4.0% p.a. (or prevailing thereafter rate, whichever is higher) |
| Variable / Trade Income | 30% Haircut (Only 70% recognized) |
| Debts Factored In | Mortgages, Car Loans, Personal Loans, Credit Cards, Student Loans |
| Owner-Occupier Refinancing | Exempt from TDSR (if no cash-out/additional debt added) |
Final Takeaway
TDSR is designed as a safety buffer to protect homeowners against over-leveraging. Getting pre-approved with an In-Principle Approval (IPA) from a bank before house-hunting gives you a clear, realistic baseline for your property search.
