Disclaimer (Block 1): This article is for educational purposes only and is intended to assist CEA-registered property agents in understanding regulatory frameworks. It does not constitute financial, tax, or legal advice. LEVR's calculations are indicative only. Always verify rates and eligibility with your bank, HDB, CPF Board, or a licensed financial advisor before advising clients.
How TDSR Works With Variable Income
The Total Debt Servicing Ratio (TDSR) caps a borrower's total monthly debt obligations at 55% of gross monthly income. For salaried employees with a fixed monthly salary, this calculation is straightforward. For borrowers whose income includes variable components — commissions, bonuses, rental income, directorship fees, or self-employed earnings — banks apply specific rules and haircuts before counting that income towards TDSR.
MAS Notice 645 (for banks) sets out the regulatory framework for how income is assessed for property loan TDSR calculations. The key principle is that variable or uncertain income is given less credit than fixed, verifiable income.
Income Type and TDSR Treatment
| Income Type | Typical Bank Treatment | Documentation Required |
|---|---|---|
| Fixed monthly salary (employed) | 100% of gross monthly salary counted | 3 months payslips + CPF statement |
| Commission income (employed) | 30% haircut applied — typically 70% of the average monthly commission over the past 12 months is counted | 12 months payslips or commission statements + NOA |
| Annual bonus (employed) | 30% haircut applied — typically 70% of the average monthly bonus contribution (annual bonus ÷ 12) is counted | 12 months payslips or last 2 years NOA |
| Self-employed income | 30% haircut applied — 70% of the average monthly income from the last 2 years NOA is counted | 2 years NOA (IRAS Notice of Assessment) |
| Rental income | 30% haircut applied — 70% of the gross monthly rental (or average rental per NOA) is counted, net of property loan repayments on that property | Tenancy agreement + NOA showing rental income declared; or rental income from most recent NOA |
| Directorship fees / dividends | 30% haircut applied — 70% of the average over the last 2 years NOA is counted | 2 years NOA + audited financial statements |
| Part-time employment | 30% haircut applied; some banks may not count part-time income at all unless it is regular and declared | Employment contract + payslips + NOA |
| Overseas income (declared in Singapore) | 30% haircut; must be verified through Singapore tax return or equivalent foreign tax documentation | Foreign payslips + tax declaration equivalent to NOA |
The 30% haircut is the regulatory minimum under MAS guidelines. In practice, some banks apply larger haircuts or impose minimum income thresholds for variable components to be counted at all. Borrowers should compare across lenders.
Worked Example: CEA Property Agent Applying for a Loan
A self-employed CEA property agent wants to purchase a $1.5M condominium. Their income over the past two years:
- Year 1 NOA (chargeable income): $180,000 ($15,000/month)
- Year 2 NOA (chargeable income): $120,000 ($10,000/month)
- Average: $150,000/year = $12,500/month
After the 30% haircut:
- Assessed income: 70% × $12,500 = $8,750/month
TDSR cap (55%):
- Maximum total debt repayment = 55% × $8,750 = $4,813/month
If the agent has no other debts, the maximum monthly mortgage is $4,813. At 5.5% stress-test rate over 25 years, this supports a loan of approximately $815,000 — meaning the agent must fund $685,000+ from cash and CPF (assuming 75% LTV applies). A $1.5M purchase may be at or near the limit of what the bank will approve.
Rental Income: The Offset Rule
Where a borrower earns rental income from a property that also has an outstanding loan, banks apply an offset:
- Net rental income counted = gross rental income (after 30% haircut) minus the monthly loan repayment on the rental property.
- If the rental income (after haircut) is less than the existing loan repayment, the net contribution is zero — the rental income does not help the TDSR calculation, and the full loan repayment is counted as a debt obligation.
- This means highly leveraged investment properties can significantly tighten the TDSR available for a new purchase.
Key Practical Implications for Agents
Agents with clients who have significant variable income should communicate these expectations early in the search process:
- Commission-heavy buyers may qualify for less than they expect. An agent or salesperson earning $10,000/month in commission who believes they can borrow based on $10,000 income will find the bank counts only $7,000 toward TDSR.
- Good income years can still leave a buyer constrained. If one of the two NOA years was a weak year, the average pulls down the assessed income significantly. Clients should ideally apply for loans in years following two strong income years.
- Investment properties create a debt loop. Buyers who own investment properties may find that the rental income barely offsets (or doesn't offset) the loan repayment when the 30% haircut is applied, tightening their TDSR for the new purchase.
- Prompt clients to declare all income accurately to IRAS. Variable income that is not declared in the NOA cannot be counted by the bank. Under-declaration of income for tax purposes reduces the assessable income for loans — a self-defeating consequence of non-disclosure.
- Refer to a bank or mortgage broker early. An In-Principle Approval (IPA) will tell the client exactly how the bank assesses their income before any OTP is issued.
Disclaimer (Block 3): LEVR's calculator outputs are estimates based on inputs provided and current regulatory parameters as known at time of publication. They are not a guarantee of borrowing capacity, stamp duty liability, or CPF eligibility. Regulatory thresholds and rates may change. Always verify with IRAS, your bank, or a licensed financial advisor before making financial decisions.