Straight-Line Depreciation

Straight-line depreciation is the simplest way to recover the cost of a business asset over time. Instead of taking larger deductions in the early years, this method spreads the asset's cost evenly across its useful life. That means you generally claim the same depreciation deduction each year until the asset is fully depreciated.

This approach is often used for financial reporting and may be available for certain business assets when permitted under IRS rules.

When Is Straight-Line Depreciation Used?

You might choose straight-line depreciation if:

• You want consistent and predictable depreciation deductions each year.
• You're preparing financial statements and want a straightforward way to track asset expenses.
• The asset is expected to lose value at a steady rate over time.
• IRS rules allow or require the straight-line method for the asset.
• You elect out of certain accelerated depreciation methods and use straight-line depreciation instead.

For many business owners, the biggest advantage is simplicity. The calculation is easy to understand, and the annual deduction stays the same throughout the asset's recovery period.

How Straight-Line Depreciation Works

To calculate straight-line depreciation:

1. Start with the asset's cost.
2. Subtract any estimated salvage value (the amount the asset may be worth at the end of its useful life).
3. Divide the remaining amount by the asset's useful life in years.

The result is your annual depreciation deduction.

Straight-Line Depreciation Formula

Annual Depreciation Expense =

(Asset Cost − Salvage Value) ÷ Useful Life

Example

Let's say you purchase a business laptop for $1,200.

• Cost: $1,200
• Salvage value: $0
• Useful life: 3 years

Calculation:

($1,200 − $0) ÷ 3 = $400

Your depreciation deduction would be:

• Year 1: $400
• Year 2: $400
• Year 3: $400

At the end of the third year, the entire $1,200 cost has been recovered through depreciation deductions.

Advantages of Straight-Line Depreciation

Many taxpayers choose straight-line depreciation because it offers several benefits:

• Easy to calculate and maintain.
• Produces the same deduction each year.
• Works well for assets that lose value evenly over time.
• Creates predictable business expenses and income reporting.
• Simplifies long-term budgeting and financial planning.

Straight-Line vs. Accelerated Depreciation

Straight-line depreciation spreads deductions evenly over the life of an asset. Accelerated depreciation methods, such as certain MACRS methods, generally allow larger deductions during the first years of an asset's life and smaller deductions later.

The best method depends on your circumstances, the type of property placed in service, and IRS requirements. Some taxpayers prefer accelerated deductions to reduce taxable income sooner, while others prefer the consistency of straight-line depreciation.

What Assets Can Be Depreciated?

Common examples of business assets that may be depreciated include:

• Computers and laptops
• Office furniture
• Equipment and machinery
• Vehicles used for business
• Certain buildings and improvements

Personal-use property generally isn't depreciable. An asset must usually be used in a trade, business, or income-producing activity to qualify for depreciation.