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In accounting, an increase in the value of an asset without an expenditure. For example, if a company spends money to renovate its office and that causes the value of the office to increase, this is not a writeup. A writeup, however, may occur if the value of the office increases for some other reason, such as gentrification. Writeups are most common during a period of price inflation in situations in which the company conducts accounting according to the fair market value of its assets.
An accounting increase in the book value of an asset without an accompanying expenditure of funds. For example, if a firm accounts for inventory on the basis of market value, the firm may need a writeup of inventory during a period of price inflation.