Amortization is the systematic allocation of the amortizable amount of an Intangible Asset over its useful life. Amortization expenses the cost of the asset in equal instalments (Straight line method of amortization) over the life of the asset, rather than when the asset is paid. Amortization is the systematic allocation of the amortizable amount of an Intangible Asset over its useful life. Amortization expenses the cost of the asset in equal instalments (Straight line method of amortization) over the life of the asset, rather than when the asset is paid for. Amortizable amount is the cost of an asset, or other amount substituted for cost, less its residual value and Residual value of an asset is the estimated amount that would currently be obtained from disposal of the asset, after deducting the estimated costs of disposal, if the asset were already of the age and in the condition expected at the end of its useful life. In UNDP all intangibles will have a zero residual life.