How Loan Repayments Work in Singapore

Every loan in Singapore — a personal instalment loan, a car loan, a housing loan — is the same machine under different labels: a balance, a rate, and a schedule of payments that extinguishes the balance. Understand the machine once and every offer you ever see becomes readable. This guide walks through how Singapore lenders actually structure repayments, how the two dominant interest conventions differ, and where the money goes when you pay early.

The standard structure: equal instalments on a reducing balance

Most Singapore personal loans and mortgages repay by equal monthly instalments calculated on a reducing balance, often described as a monthly rest. Each month the lender charges interest only on the outstanding balance, your instalment first covers that interest, and the remainder reduces the principal. The instalment is the same number from the first month to the last, but its composition shifts constantly: early payments are mostly interest, late payments are mostly principal. On an illustrative S$20,000 loan at an 8% annual rate over 2 years, the instalment is about S$904 a month and total interest comes to roughly S$1,707 — run the same figures through the personal loan calculator and you will see the balance fall slowly at first and fast at the end.

That slow-then-fast shape is the single most useful thing to internalise about amortisation. Because interest is charged on what you still owe, every extra dollar of principal you remove today stops generating interest for the rest of the term. A borrower who adds S$100 a month to the illustrative loan above shaves months off the term and pockets the interest those months would have cost — the loan repayment calculator shows exactly how much, including how many months early the loan finishes.

The other structure: flat rates charged on the original principal

Singapore car loans — and some other consumer instalment products — are commonly quoted using a flat interest rate. Under a flat rate, interest is computed once on the original financed amount for the whole term, added to the principal, and divided by the number of months. The illustrative S$20,000 at a "flat 8%" over 2 years would cost S$3,200 in interest and S$966.67 a month — noticeably more than the S$1,707 the same headline number costs on a reducing balance. The two conventions are not directly comparable at the same percentage, which is why regulators and consumer educators point borrowers to the effective interest rate (EIR) rather than the advertised rate. The companion guide on flat versus reducing rates in Singapore works through the arithmetic in detail.

A flat-rate loan behaves very differently when you pay early. Because the interest was fixed at the start on the full principal, settling the loan midway does not automatically save the unearned portion — lenders typically rebate the unearned interest under a formula such as the Rule of 78, which front-loads the interest you have effectively already paid. The rebate is real but less than straight pro-rata, and administrative conditions can apply, so confirm the settlement figure with your lender rather than assuming a proportional refund.

Where the structure differs by product

• Housing loans: bank mortgages amortise on a reducing balance, and every instalment is screened against Singapore's debt-ceilings — the TDSR and, for HDB flats and executive condominiums, the MSR. See the mortgage calculator and the guide on TDSR and MSR for how those caps shape what you can borrow.
• Car loans: typically flat-rate, with the maximum loan and tenure set by MAS vehicle-financing rules depending on the car's Open Market Value. The car loan calculator handles both rate conventions and shows the estimated EIR.
• Personal instalment loans: reducing balance, equal instalments; licensed moneylenders are capped by statute at 4% per month on secured and unsecured credit, with a S$60 monthly ceiling on late fees.
• Credit cards: revolving credit with a minimum monthly payment that often covers little beyond interest. A balance can survive indefinitely at the minimum — the credit card calculator demonstrates how long, and the guide to credit card costs explains the mechanics.

Paying early, and what to compare

On a reducing-balance loan, extra payments reduce interest from the month they land — no formula stands between the smaller balance and the smaller charge. Some products carry conditions or notice periods for full settlement, so confirm the process with your lender before assuming. Never pay an upfront "arrangement fee" to anyone for the privilege of repaying your own debt; that is a broker's fee, not the lender's.

When comparing two offers, the only fair metric is total repayment at the same term — the sum of every payment you would make — or, better, the EIR your lender discloses. The headline rate can mislead (flat and reducing rates are not comparable at the same percentage), and the monthly instalment can mislead worse, because a longer term shrinks the payment while growing the total. Run any offer through the calculators before signing, and check the lender's own disclosure documents for the EIR that applies to you.