Sarah Chen
The mortgage calculator shows your monthly home loan instalment in Singapore, along with the total interest you will pay and how each payment splits between principal and interest over time. Enter your loan amount, interest rate and tenure to see exactly what your mortgage costs each month.
A home loan is likely the largest financial commitment you will make, and the monthly repayment shapes your budget for decades. This calculator converts three inputs (the loan amount, the annual interest rate and the loan tenure in years) into a clear monthly figure. Beyond the instalment, it reveals the total interest paid across the life of the loan and produces an amortisation breakdown showing how your outstanding balance falls year by year.
Seeing these numbers side by side helps you understand the true cost of borrowing, not just the headline rate.
Singapore home loans use standard amortisation. Each monthly payment is fixed (for a given rate) and covers the interest due that month plus a portion of the principal. Early in the loan, most of your payment goes to interest because the outstanding balance is large. As the balance shrinks, more of each payment chips away at the principal. The calculator applies the standard amortisation formula, factoring the monthly interest rate and the total number of payments, to produce an accurate instalment.
Two features unique to Singapore are worth noting. Many loans are floating-rate packages pegged to a reference rate such as SORA, so your instalment can change when the reference rate moves. And most borrowers service part or all of their repayment through their CPF Ordinary Account, which affects how much cash leaves your pocket each month even though the loan figure is the same.
Take a S$800,000 loan over 25 years at 3.5% per annum. The monthly repayment works out to about S$4,005. Over the full term you would repay roughly S$1.2 million in total, of which around S$400,000 is interest. Raise the rate to 4% and the monthly payment climbs to about S$4,222, a reminder of how sensitive your budget is to interest rate movements. The calculator lets you test these scenarios in seconds.
Buyers use it to confirm a new loan fits their monthly budget before committing. Existing homeowners use it to see how a rate change at the end of a lock-in period will affect their instalment. Anyone comparing a shorter tenure against a longer one can weigh lower total interest against a higher monthly outlay. It is also handy for planning extra repayments, since reducing the principal early cuts the interest you pay over the remaining years.
The headline interest rate only tells part of the story. A small difference in rate or a few extra years of tenure can mean tens of thousands of dollars more in interest. By viewing the full repayment and amortisation picture, you can make informed choices: whether to lock in a fixed rate for certainty, whether to shorten the tenure to save interest, and whether your cash flow can absorb a future rate rise.
It uses the amortisation formula based on your loan amount, the monthly interest rate and the number of monthly payments over your tenure. Each instalment covers that month's interest plus part of the principal.
On a fixed-rate package it stays the same during the lock-in period. On a floating-rate package pegged to SORA, the instalment changes when the reference rate moves.
Yes. Most buyers use their CPF Ordinary Account for part or all of the monthly repayment, which reduces the cash component, though the total loan repayment is unchanged.
Choose a shorter tenure, secure a lower interest rate through refinancing, or make partial capital repayments (subject to any prepayment penalty during a lock-in period).
The repayment shown reflects the actual rate you enter. The 4% stress test is used separately by banks to assess loan eligibility, not to set your real monthly instalment.
This guide is for general information only. Your actual repayment depends on your bank's package terms and prevailing interest rates.
The sell-one-buy-two calculator models the Singapore strategy where a couple sells their jointly owned home and each spouse buys a separate property in their sole name, allowing both purchases to qualify as first homes and avoid second-property ABSD. It calculates net sale proceeds, available cash and CPF, individual loan eligibility under TDSR, stamp duty on each new purchase, and total upfront cash required to confirm whether the strategy is feasible.
Sarah Chen·22 Jun 2026
The decoupling calculator helps Singapore property co-owners determine whether transferring one owner's share to the other is financially worthwhile. It compares the Additional Buyer's Stamp Duty saved on a subsequent purchase against the costs of decoupling, including Buyer's Stamp Duty on the transferred share, legal fees, and refinancing costs, to produce a net benefit figure.
Sarah Chen·22 Jun 2026© 2026 Cashew. All rights reserved.
