Which accounting concept allows a business to make a one time change in how they expense an item?

The accounting concept that allows a business to make a one-time change in how they expense an item is known as the "accounting principle of consistency." This principle requires businesses to use the same accounting methods and practices over time, but it also allows for changes in accounting estimates or methods, as long as the change is justified and disclosed in the financial statements. If a company decides to change its method of expense recognition, it must provide reasoning for the change and any impact it may have on financial reporting.