Straight line method of amortization is pretty straight forward. We take the same amount and depreciate it from month to month until the life of the asset is zero like you stated. Can you share an example of how this would work? Consider that the company you work for purchased a new copier for $5,000 and its useful life is five years. How would you amortize it under the straight line method? What would be the journal entries you would make? How about double declining method? Any ideas?