Amortising-loan interest

An amortising loan reduces principal through scheduled repayments. With a fixed periodic rate, interest on the remaining principal normally falls as principal is repaid, while each instalment may contain different interest and principal proportions. The interest basis, payment dates, fees and any rate resets must be read from the agreement. A constant total instalment does not mean constant interest expense. This calculation is distinct from reducing-balance depreciation of a non-current asset and from an effective-interest accounting rate that incorporates relevant fees or discounts.