Depreciation Expense Explained (With a Simple Example)

Depreciation sounds like something only an accountant needs to worry about, but it shapes your financial statements and how your business looks on paper. The good news is the core idea is simple.

Here is what depreciation means, how it is calculated, and a clear example you can follow.

What is depreciation?

When your business buys something big that lasts for years, a vehicle, equipment, a computer system, you do not record the whole cost as an expense the day you buy it. Instead, you spread that cost across the years you actually use the item. That spreading is depreciation.

The idea is to match the cost of an asset to the time it helps earn money, so each year’s profit reflects a fair share of what that asset cost.

Two quick categories:

• Tangible assets are physical, like vehicles, machinery, and equipment. These are depreciated.
• Intangible assets are non-physical, like a patent or a software license. Spreading their cost has its own name, amortization, but the idea is the same.

How depreciation is calculated

There are a few methods. The one most small businesses see is the simplest:

• Straight-line spreads the cost evenly across the asset’s useful life. The same amount every year.
• Declining balance is accelerated, more expense in the early years, less later.
• Units of production ties depreciation to use, based on hours run or units made.

A simple example

Book depreciation vs. tax depreciation

Here is where it is worth knowing your lane. What you just saw is book depreciation, how the expense is recorded in your everyday financial statements.

There is also tax depreciation, with special rules like Section 179 and bonus depreciation that can let a business deduct much more of an asset’s cost up front. Those rules are set by the IRS and change with new tax laws. The 2025 federal tax law, for example, restored 100% bonus depreciation for many qualifying purchases. How your assets are depreciated for taxes is a decision for your CPA or tax preparer. Coastal records depreciation in your books so both pictures stay accurate; your CPA handles the tax treatment.

Why depreciation matters

Recording depreciation keeps your financial statements honest. Without it, buying a $30,000 truck would make one month look terrible and every month after look better than it really is. Depreciation smooths that out, so your profit and your balance sheet reflect reality.

Frequently asked questions

What can be depreciated?

Assets your business owns and uses for more than a year, like vehicles, equipment, machinery, and furniture. Things you use up quickly, like office supplies, are simply expensed when you buy them.

Straight-line or accelerated, which should I use?

For your books, straight-line is the common, simple default. For taxes, the method and any special deductions are your CPA’s call, because they carry tax consequences. This is a good example of a bookkeeper and a CPA working together.

Do I handle depreciation, or does my accountant?

A bookkeeper records depreciation in your books so your monthly statements are accurate. Your CPA decides the tax treatment at filing time. If you are unsure whether your books even track your assets correctly, that is exactly the kind of thing a clean-up sorts out.

Where Coastal fits in

Coastal Bookkeeping keeps your assets and depreciation recorded correctly month to month, so your balance sheet and profit and loss tell the truth, and so your CPA has clean records to work from at tax time. Coastal handles the bookkeeping. Your CPA handles the taxes.