Calculators
The numbers behind a purchase — affordability under MAS rules, repayments, duties, rent-vs-buy, and more. Every tool shows exactly how it's calculated.
$733,571
Maximum property budget
after BSD from your funds
$682,029
Max loan (MSR 30% binding, 4% stress)
$3,600
Max monthly repayment allowed
$200,000
Downpayment funds (cash + CPF)
BSD at this budget ≈ $16,607
Know your budget? Browse what it buys →
How this is calculated
Your repayment ceiling is the tighter of MAS's two rules: TDSR — total monthly debts ≤ 55% of gross income — and MSR — the housing loan alone ≤ 30% of gross income — which applies to HDB flats and new ECs bought from the developer, but not a resale EC after its MOP (that's treated as private, TDSR only). The maximum loan is the principal that ceiling supports at the regulatory 4% stress rate (banks must test at this floor even if the package is cheaper): loan = payment × ((1+r)^n − 1) / (r(1+r)^n), monthly r = 4%/12.
The budget is the largest price where the loan you can raise — the smaller of that income cap and 75% of the price — plus your cash and CPF covers the price and its BSD. This binds LTV and your funds together, so a cash-short buyer is never credited a loan above 75%. At least 5% of a bank purchase must be cash.
Rules: MAS TDSR/MSR notices; first-loan LTV 75%, dropping to 55% when the tenure runs long (>30y private / >25y HDB) or the loan ends past age 65. HDB-loan LTV was cut from 80% to 75% in Aug 2024. Tenure caps: 25y (HDB loan), 30y (bank on HDB), 35y (private).
Calculator questions, answered straight
Why does affordability use 4% when actual rates are lower?
MAS requires banks to stress-test every housing loan at a 4% floor, regardless of the package you'll actually sign. Your maximum loan is set by that stress test — so a cheaper package lowers your instalment, but never raises your ceiling. Our calculator mirrors the rule banks must apply.
The bank offered me more than your calculator says. Who's right?
Possibly both. Banks can count variable income at haircuts, rental income, or a guarantor we don't know about — and some quote before full TDSR checks. Treat our number as the conservative planning floor; anything above it deserves scrutiny of what assumptions got it there.
When are BSD and ABSD actually payable?
Within 14 days of exercising the option (or signing the sale & purchase agreement) — before completion, and in cash or CPF, not from your loan. Budget duties alongside the downpayment, not as a completion-day item. SSD, if you sell within 4 years, is deducted at the sale.
Executive Condo — does MSR apply to me?
Only if you're buying a new EC directly from the developer: then the 30% MSR caps your loan on top of the 55% TDSR. A resale EC bought after its 5-year Minimum Occupation Period is treated as private property, so only the 55% TDSR applies — which usually means a larger loan. Pick the matching option in the affordability tool; it changes the answer.
Can I use all my CPF OA for the purchase?
For an HDB flat on an HDB loan, yes — up to the price. For a bank loan, CPF can cover the downpayment above the 5% minimum cash, but CPF usage on the property is capped at the Valuation Limit (and a Withdrawal Limit for private property), and you must set aside the Basic Retirement Sum from age 55. Treat 'CPF OA available' here as what you can realistically deploy, not your full balance.
Refinance or reprice — and what's the catch?
Repricing (a new package with your existing bank) is cheaper and faster; refinancing (moving to another bank) usually wins on rate but carries legal and valuation costs. Both only make sense once your lock-in ends — an early-redemption penalty (typically 1.5% of the loan) dwarfs any saving. Watch for a clawback of the legal subsidy from your original loan if you refinance within its first ~3 years; fold that into the 'costs' field.
Is the en-bloc score a prediction?
No — it's a screening heuristic that weighs the factors successful collective sales share (unused plot potential, age, tenure, owner count). A real sale still needs an 80% owner mandate and a developer willing to pay the reserve price. Use it to rank candidates for deeper research, not to time a purchase.
Rent vs buy says renting wins — is buying a mistake?
The calculator measures money over your chosen horizon; it can't price stability, renovation freedom, or landlord risk. Short horizons and high alternative returns favour renting; long horizons and normal appreciation favour buying. Change the assumptions to match your life, then decide — the point is seeing which assumption drives the answer.
Rates and rules as published by IRAS, MAS and HDB (mid-2026); packages and eligibility vary by bank and profile. These tools are planning aids, not financial advice.