The rule
MAS Notice 645 (TDSR computation) requires that variable income be multiplied by a factor of 0.7before being included in the borrower's effective monthly income. This haircut is a stress margin — variable income is more uncertain than salary, so the bank assumes only 70% of it will reliably be there to service the loan.
By income type
| Income type | Haircut | Notes |
|---|---|---|
| Fixed monthly salary | 0% (none) | Contractual basic salary |
| Fixed monthly allowance (housing, transport) | 0% (none) | If contractually guaranteed |
| Annual bonus (averaged monthly) | 30% haircut → 70% count | Typically averaged over 12 months |
| 13th-month AWS | 30% haircut | Unless contractually guaranteed (rare) |
| Commission (sales) | 30% haircut | Average of last 12 months |
| Freelance / self-employment | 30% haircut | Requires 24-month track record |
| Rental income from property | 30% haircut (sometimes further reduced for expenses) | Bank-by-bank methodology |
| Dividend / investment income | 30% haircut | Usually 12-24 month average |
| Second-job income | 30% haircut | May require additional verification |
Worked example
Borrower profile:
- Fixed monthly basic salary: $8,000
- Annual bonus: $30,000 (averaged $2,500/month)
- Side commission: $1,000/month (averaged)
- Rental income from a property: $3,000/month gross
Effective income for TDSR:
Fixed: $8,000 × 1.00 = $8,000
Bonus: $2,500 × 0.70 = $1,750
Commission: $1,000 × 0.70 = $700
Rental: $3,000 × 0.70 = $2,100 (some banks apply additional ~30% expense)
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Effective income: ~$12,550/monthWithout the haircut, the same borrower would show $14,500/month — a difference of about $1,950/month. At 55% TDSR over 25 years at 4% stress, that's the difference between borrowing roughly $1.55M and $1.35M — about $200K less because of the haircut.
Documentation banks require
- For fixed income: 3 most recent payslips + latest CPF contribution history.
- For bonus / commission: latest tax assessment (IRAS NOA) showing the variable component, plus letter from employer confirming the bonus / commission policy. 12 to 24 months of evidence preferred.
- For self-employed: 2 years of NOA, business profile (ACRA), bank statements.
- For rental income: existing tenancy agreement (stamped), bank statements showing rent receipts.
- For dividends: account statement showing 12–24 months of distributions.