What are examples of matching principle?

The best example of when the matching principle comes into play concerns the case of businesses that resell inventory. In our hot dog stand example, you should count the expense of a hot dog and the expense of a bun on the day when you sell that hot dog and that bun. Don't count the expense when you buy the buns and the dogs. Count the expense when you sell them. In other words, match the expense of the item with the revenue of the item