You apply the matching principle when you record expenses in the same period as the revenue they help produce. This aligns your income statement with how your business actually earns money.
When you sell a product, for example, you must record the cost of goods sold (COGS) in the same period as the sales revenue. COGS includes direct costs such as materials and labor used to produce the item.
Consider the case of selling 1,000 units in March, where you record the sales revenue in March. You also record the cost of those 1,000 units as COGS in March, even if you bought the inventory in February. This shows your true gross profit for the month: (Sales Revenue) - (COGS) = Gross Profit
If you delay recording COGS, you overstate profit. If you record it too early, you understate profit. But matching COGS with the related sales time period gives you a clear view of margins and helps you price products correctly.
In another matching principle use-case, when buying equipment or a building, you do not expense the full cost at once. Instead, you spread the cost over its useful life through depreciation expense.
If you purchase machinery for $100K and expect it to last 10 years, you may record $10K depreciation each year under straight-line depreciation. This annual depreciation expense matches the cost of the asset to the revenue it helps generate.
You avoid showing a large loss in the year of purchase. At the same time, you avoid overstating profits in later years by ignoring the asset’s cost. Depreciation works even when revenue varies. You still record depreciation each period because the asset continues to support operations over its useful life.
A third use-case of the matching principle is where you pay for services before you use them. These payments create prepaid expenses, which are a type of deferral.
Common examples include prepaid insurance and prepaid rent. If you pay $12K one-year insurance policy in January, you do not record the full amount as an expense in January. Instead, you record $1K per month as an insurance expense.
The remaining balance stays on your balance sheet as prepaid insurance until you use the coverage. The same logic applies to prepaid rent. This process prevents you from understating profit in the first month and overstating profit in later months. You match the expense to the period that benefits from the service.