What Is Depreciation and Why Does It Matter?
Depreciation is the accounting method of spreading the cost of a tangible asset over its useful life. Instead of recording the full expense when you buy equipment, a vehicle, or machinery, depreciation lets you allocate that cost across the years you actually use the asset.
This matters for two important reasons: it gives a more accurate picture of your business finances, and it provides significant tax benefits by reducing taxable income each year.
Common Depreciation Methods
Straight-Line Depreciation
The simplest and most widely used method. It spreads the cost evenly across the asset life.
Formula: (Cost – Salvage Value) / Useful Life = Annual Depreciation
Example: You buy a delivery van for $40,000 with a $5,000 salvage value and a 7-year useful life.
Annual depreciation = ($40,000 – $5,000) / 7 = $5,000 per year
This method works best for assets that wear out steadily over time, like furniture, buildings, or general equipment.
Declining Balance Method
This accelerated method front-loads depreciation, giving you larger deductions in the early years and smaller ones later. The most common variant is the double declining balance (DDB) method.
Formula: Book Value × (2 / Useful Life) = Annual Depreciation
Example with the same $40,000 van (7-year life):
- Year 1: $40,000 × 28.57% = $11,429
- Year 2: $28,571 × 28.57% = $8,163
- Year 3: $20,408 × 28.57% = $5,831
The declining balance method is ideal for assets that lose value quickly, such as technology equipment, vehicles, and electronics.
Units of Production
This method ties depreciation to actual usage rather than time. It is commonly used for manufacturing equipment.
Formula: (Cost – Salvage Value) / Total Expected Units × Units Produced = Depreciation
If a machine costs $100,000, has a $10,000 salvage value, and is expected to produce 500,000 units, each unit carries $0.18 in depreciation.
Which Method Should You Use?
- Straight-line for simplicity and predictable expenses on general assets
- Declining balance when you want maximum tax deductions in early years or for assets that lose value rapidly
- Units of production for equipment where wear is directly tied to output
Tax Implications
Depreciation is a non-cash expense — you do not actually spend money each year, but you still deduct it from your taxable income. For small businesses, this can result in substantial tax savings.
Section 179 Deduction: In many jurisdictions, businesses can deduct the full cost of qualifying assets in the year of purchase, rather than depreciating over time. This is particularly valuable for small businesses making equipment purchases.
Practical Tips
- Keep detailed records of purchase dates, costs, and expected useful lives for all assets
- Review salvage values annually — market conditions can change what an asset is worth at end of life
- Consult a tax professional to determine which depreciation method maximizes your tax benefits
- Track accumulated depreciation to know the book value of your assets at any time
Calculate Depreciation for Your Assets
Use our depreciation calculator to compare different methods side by side. Enter your asset cost, salvage value, and useful life to see annual depreciation schedules and book values for each approach.