A journal entry for depreciation expense is a way for businesses to record the amount of money spent on long-term assets over time. This type of accounting entry is most often used to track expenditures on items such as buildings, furniture, and vehicles. Depreciation can also be used to reduce income taxes by spreading out how much an asset costs in a year. It is important to keep accurate records of all depreciation expenses so that they can be reported accurately. With this information, businesses can make more informed decisions when it comes to protecting their investments.