Aishah Earns $11k Self-Employed. The Bank Will Only Count $7,700.

Aishah runs a small design studio. Last year it cleared a good profit, the year before slightly less, and her two-year average works out to about $11,000 a month — the same gross income as a salaried friend who just bought a condo without much fuss. So when the banker tells her the loan she qualifies for is roughly 30% smaller than her friend's, on identical income, it feels like a penalty for being self-employed. It is not a penalty exactly. It is a rule, it is knowable in advance, and it sets a price ceiling she needs to see before she views anything. Here is that math, run end to end.

Aishah is a composite — a profile built from typical figures, not a real client. The assumptions are stated; the workings below are the real calculations for those assumptions.

The rule: a 30% haircut, then a two-year average

Two MAS rules shape Aishah's number before any property is in the picture. The Total Debt Servicing Ratio (TDSR) caps all her monthly debt repayments — home loan, car, credit cards, everything — at 55% of gross monthly income. And variable income — commissions, bonuses, rental, and crucially self-employed income — is recognised only after a 30% haircut. Banks assess the self-employed on a two-year average of their Notice of Assessment (NOA) from IRAS, and then apply the haircut to that average.

So Aishah's $11,000 two-year average does not enter the calculation as $11,000. It enters as $7,700 — 70% of it. That single step is the whole story. Her salaried friend on a fixed $11,000 salary is recognised at the full $11,000, because a basic salary is not variable income and is not haircut. Same headline income, two different recognised figures: $11,000 versus $7,700.

What that does to the loan

The rest follows mechanically. Lenders stress-test the loan at a medium-term rate floor of 4.0% (well above the rate she would actually pay), and Aishah is 38, so her tenure runs to the standard retirement-age cap of about 27 years.

On recognised income of $7,700, her TDSR ceiling is $4,235 a month (55% of $7,700, assuming no other debts). Capitalised at 4.0% over 27 years, that supports a maximum loan of about $838,000. Her salaried friend, recognised at $11,000, has a ceiling of $6,050, which supports about $1,198,000 — a difference of roughly $360,000, or exactly 30%. The haircut on income passes straight through to a haircut on borrowing power.

The price ceiling she should carry to a viewing

Translate the loan into a price. At the standard 75% loan-to-value, an $838,000 loan implies a purchase price around $1.12 million before her own cash and CPF top up the rest — against roughly $1.60 million for her salaried friend. That half-million gap is not a difference in what they earn or what they can afford month to month; it is purely what the rules let each of them borrow.

It matters because the number that bites is the stress-test figure, not the real instalment. Take a $1.5 million condo Aishah likes: the 75% loan is $1.125 million, and at the 4.0% stress rate over 27 years that tests at about $5,684 a month — well above her $4,235 ceiling, so the loan is declined, even though at the 2.6% rate she would actually pay, the real instalment on the loan she can get (~$838,000) is about $3,600. She can comfortably service $3,600 a month. The rule is not asking whether she can pay; it is asking whether she clears the stress test on haircut income. On a $1.5m flat she does not. On something around $1.12m she does.

What Aishah can actually do about it

The haircut is fixed, but the inputs around it are not, and a few are worth knowing before she resigns herself to the lower ceiling.

The cleanest lever is time and documentation. The two-year NOA average rewards a clean, rising income history; a self-employed buyer who under-declares to save on tax is quietly shrinking the very figure the bank will halve and then cap. A stronger, well-documented two-year NOA is the most direct way to lift the recognised number. A longer tenure helps at the margin if age allows, though the retirement-age cap and the reality of a longer debt limit how far. Clearing other debts matters more than it looks: every dollar of car loan or credit-card minimum comes off the same $4,235 ceiling, so the self-employed buyer has less room to absorb them than a salaried one. And the honest option is to buy to the real ceiling — around $1.12m here — rather than stretch, since the rule is, in effect, the system enforcing a buffer against exactly the income volatility that makes self-employment riskier.

There is no trick that makes $11,000 of self-employed income count as $11,000; the 30% haircut is the rule and it applies to everyone with variable income. What Aishah can do is stop being surprised by it. Pull the two-year NOA average, take 70%, multiply by 55%, and price the loan at 4% over her available tenure — and she walks into a viewing knowing her ceiling instead of discovering it at the mortgage stage. The penalty is not being self-employed. The penalty is finding out the number after you have fallen for the flat.

Sources: MAS — Total Debt Servicing Ratio rules; Nexus Mortgage — TDSR & the variable-income haircut; Homejourney — self-employed mortgage eligibility (two-year NOA). TDSR limit (55%), variable-income haircut (30%), and the 4.0% medium-term stress rate as at June 2026; loan, ceiling, and instalment figures computed for the stated assumptions.

Aishah is an illustrative composite, not a real client. Silas Tan is a District Director at Huttons Asia and co-founder of TRIBE. He built the Resale Project Scorecard (RPS) using 126,000+ URA REALIS transactions. This article is for informational purposes and does not constitute financial or investment advice. CEA Registration R000303I.