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Mortgage calculator: monthly instalment and total interest

See your monthly instalment, total interest and how quickly your loan balance falls, at your bank's rate and at the 4% stress rate banks use for TDSR.

Monthly instalment—
Loan amount—
Total interest—
Income needed (TDSR)—At 4% stress, no other debts
End of yearPrincipal paidInterest paidBalance

Understanding your instalment

Each monthly instalment covers that month’s interest first, and the rest reduces your loan. In the early years most of the payment is interest. That is why the table shows the balance falling slowly at first and faster later.

Why check the 4% stress rate?

MAS requires banks to assess private property loans at a minimum 4% p.a. when checking the 55% TDSR limit, even if your actual package rate is lower. If rates rise, you know your cash flow can still cope. The “income needed” figure shows the gross monthly income the bank will want to see for this loan.

New launch tip: you don’t pay the full instalment on day one

For uncompleted projects like One Chuan Grove, the bank releases the loan in stages as construction progresses. Your instalment starts small and grows over about four years. Model it with the progressive payment calculator.

Frequently asked questions

What mortgage interest rate should I assume in Singapore in 2026?

Rates change often. Use the package rate your bank quotes for your actual instalment. For stress-testing, banks must assess private property loans at a minimum 4% p.a. under TDSR, so check that you are comfortable at that level too.

Is a 30-year or 25-year loan better?

A longer tenure lowers the monthly instalment but increases total interest paid. A shorter tenure saves interest but needs higher monthly cash flow. The loan must end by age 65 to qualify for the full 75% LTV.

Can I use CPF to pay my monthly mortgage?

Yes. CPF Ordinary Account savings can be used for monthly instalments, subject to the Valuation Limit and the age-95 lease rule. Many buyers split payment between CPF and cash.

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