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For a standard amortising loan the instalment is M = P × [i(1+i)^n] / [(1+i)^n − 1], where P is the loan amount, i the monthly interest rate (annual rate ÷ 12), and n the total number of monthly payments. Early instalments are mostly interest; the principal portion grows as the balance falls.

A reducing balance rate charges interest only on the outstanding balance, so total interest falls as you repay. A flat rate charges interest on the original amount for the whole term. A 5% flat rate is roughly equivalent to a 9–10% reducing balance rate, which is why car and personal loans quoted as flat rates cost far more than they appear to. Always compare the effective rate.

Usually a great deal. Because interest accrues on the outstanding balance, every extra ringgit of principal removes all the future interest that ringgit would have generated. On a 30-year home loan, one extra instalment a year commonly cuts four to six years off the term. Check your loan agreement first — some Malaysian loans carry early-settlement charges within a lock-in period.

Most Malaysian banks look for a debt service ratio below roughly 60–70% of net income, but that is a lending ceiling, not a target. Keeping total loan commitments under about 40% of take-home pay leaves room for saving and for surprises. Above 50%, most households have very little resilience to a rate rise or an income gap.