TDSR — 55% Cap
Total monthly debt repayments (mortgage at the 4% stress rate plus all other loans) cannot exceed 55% of your gross monthly income. Variable income is haircut to 70%. Self-employed applicants face the same haircut on declared income.
Home Loan Affordability Calculator Singapore
By Dan Ler, Mortgage Advisor · Updated 16 July 2026
Know your exact borrowing limit before you place an OTP. This free tool runs the MAS 4% stress test, applies the 30% MSR cap for HDB, and 70% haircut on variable income — the same maths every Singapore bank uses to assess your home loan.
Your Profile
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Property Type
Applicant 1
Basic salary, allowances
Bonus, commission — 70% counted
Used for IWAA tenure cap
Car, personal, student loans
Under MAS rules, monthly card debt = 5% of total balance OR S$50 per card, whichever is higher.
The Numbers Behind The Tool
How Singapore Banks Decide How Much You Can Borrow
Three MAS rules govern every home loan in Singapore. The lower of the three caps wins — and that's usually the surprise.
MSR — 30% Cap
For HDB flats and Executive Condominiums, the new mortgage payment alone cannot exceed 30% of gross income. This rule is stricter than TDSR for most buyers and usually decides the loan size.
Tenure Cap (IWAA)
HDB tenure caps at 25 years; private at 30 years. Banks also cap tenure at age 65 (HDB) or 75 (private) using Income-Weighted Average Age across joint borrowers, which can shorten the loan term and reduce your maximum loan.
Worked Example
A Single Applicant Buying an HDB Resale
Mr. Tan, 38, earns S$7,500 fixed plus S$2,000 variable monthly. He has a S$450/month car loan and S$30,000 outstanding across 3 credit cards. For an HDB resale flat, he wants to know his maximum bank loan.
- Stress income: S$7,500 + (70% × S$2,000) = S$8,900/mo
- Card debt: max(5% × S$30,000, 3 × S$50) = S$1,500/mo
- TDSR room: 55% × 8,900 − 450 − 1,500 = S$2,945/mo
- MSR room: 30% × 8,900 = S$2,670/mo (tighter)
- At 4% stress, 25-year tenure → max loan ≈ S$505,000
For HDB, MSR usually bites first — so Mr. Tan's card balance doesn't change the answer here. But for private property where only TDSR applies, paying down that S$30,000 balance recovers S$1,500/month of TDSR room — roughly S$300k of borrowing power at 30-year tenure.
More Scenarios
Private Property, Joint Applicants and the Tenure Cap
A couple buying a private condo
Sarah (34, S$9,000 fixed) and Wei Ming (36, S$6,000 fixed + S$1,500 variable) buy a S$1.6m condo. No MSR here — only the 55% TDSR applies, stress-tested at 4%:
- Stress income: 9,000 + 6,000 + (70% × 1,500) = S$16,050/mo
- TDSR room (no other debts): 55% × 16,050 = S$8,827/mo
- At 4% stress, 30-year tenure → supports a loan well above the 75% LTV cap of S$1.2m — so LTV, not TDSR, is their binding limit
This is common for dual-income private buyers: the TDSR passes easily and the real constraint is the downpayment and stamp duty cash.
How age shortens your tenure (IWAA)
Joint borrowers get an income-weighted average age (IWAA). If Sarah (34) earns twice what a 58-year-old co-borrower does, the IWAA is pulled young and tenure stays long. Flip the incomes and the IWAA rises — a 75% LTV bank loan must end by age 65 and 30 years max (25 for HDB), so an older IWAA cuts the tenure, which raises the stressed monthly and shrinks the loan even when income is high.
Rule of thumb: every 5 years of tenure lost cuts the maximum loan by roughly 12–15% at the 4% stress rate. If the calculator shows a tenure-capped result, restructuring who borrows can matter more than earning more.
Rules per MAS Notice 645 (TDSR) and HDB financing rules. See live packages on our rates page or unlock equity via a cash-out loan.
Common Questions
Affordability FAQ
TDSR (Total Debt Servicing Ratio) is a MAS rule that caps total monthly debt repayments — including the new mortgage stress-tested at 4% p.a. — at 55% of your gross monthly income. It applies to both HDB and private property purchases.
MSR (Mortgage Servicing Ratio) is an additional cap of 30% of gross income that applies only to HDB flats and Executive Condominiums. It's calculated alongside TDSR, and the lower of the two limits determines your maximum loan.
Banks haircut variable and self-employed income to 70% of the declared figure under MAS guidelines. Bonuses, commissions, rental income, and freelance income are all treated as variable. Fixed salary is used at 100%.
MAS requires banks to stress-test every residential loan at a 4% p.a. medium-term rate, even if your actual package is much lower. This protects borrowers against rate rises. Your repayment is charged at the real rate, but your maximum loan is sized at 4%.
A 75% LTV bank loan must end by age 65 with a maximum 30-year tenure (25 years for HDB). Joint borrowers use an income-weighted average age (IWAA), so an older higher-earning co-borrower shortens the tenure, which raises the stressed monthly payment and reduces the maximum loan.
Yes. Outstanding card balances count toward TDSR at the higher of 5% of the balance or S$50 per card each month. A S$30,000 balance costs S$1,500 of monthly TDSR room — roughly S$300,000 of borrowing power at a 30-year tenure. Paying cards down before applying directly raises your maximum loan.
For an owner-occupied home, refinancing is generally exempt from the 55% TDSR cap, so you can usually switch to a cheaper package even if your ratios are tight. TDSR applies in full when purchasing, and to investment-property refinancing unless transitional conditions are met. See our refinance savings calculator.
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