Straight Line Depreciation Calculator
Calculate the annual depreciation expense for any asset and generate a complete year by year depreciation schedule using the straight line method.
| Year | Book Value (Start) | Depreciation Expense | Accumulated Depreciation | Book Value (End) |
|---|
IRS Asset Class Life Reference
IRS Publication 946 provides useful life guidelines for common business assets. Use these as a reference when entering the useful life field.
| Asset Type | IRS Class Life | MACRS Recovery Period |
|---|---|---|
| Computers and peripherals | 5 years | 5 years |
| Office furniture and fixtures | 10 years | 7 years |
| Light general purpose trucks | 4 years | 5 years |
| Heavy general purpose trucks | 6 years | 5 years |
| Manufacturing machinery | 10 years | 7 years |
| Residential rental property | 40 years | 27.5 years |
| Nonresidential real property | 40 years | 39 years |
What Is Straight Line Depreciation?
Straight line depreciation is an accounting method that spreads an asset’s cost evenly across its entire useful life. Each year, the same fixed expense is recorded until the asset’s book value reaches its estimated salvage value.
It is the most straightforward depreciation method and is widely used because it is easy to calculate, easy to audit, and produces consistent expense recognition from year to year. It is accepted under both US GAAP and IFRS for many asset types.
Straight Line Depreciation Formula
The straight line depreciation formula is simple and requires only three values. Annual Depreciation Expense = (Asset Cost minus Salvage Value) divided by Useful Life in Years.
The depreciable base is the asset cost minus the salvage value. The depreciable base is divided by the number of years of useful life to get a constant annual charge. This annual charge reduces the asset’s book value by the same amount every year until the book value equals the salvage value.
Example Calculation
An asset costs $11,000, has a $1,000 salvage value, and a 5 year useful life. Depreciable Base = $11,000 minus $1,000 = $10,000. Annual Depreciation = $10,000 divided by 5 = $2,000 per year. Over 5 years the total depreciation equals $10,000, leaving a $1,000 book value.
When to Use Straight Line Depreciation
Straight line depreciation is best suited for assets that provide roughly equal economic benefit each year, such as buildings, furniture, and certain equipment. It is the preferred method when the pattern of benefit consumption is uniform and predictable.
For assets that lose value faster in early years, such as vehicles or technology equipment, an accelerated method like double declining balance may better match expenses to actual asset usage. Consult a tax professional to determine which method best suits each asset class in your situation.
Frequently Asked Questions
Straight line depreciation is a method of allocating an asset’s cost evenly over its useful life. The same depreciation expense is recorded every year until the asset reaches its salvage value. It is the simplest and most commonly used depreciation method.
The formula is: Annual Depreciation = (Cost minus Salvage Value) divided by Useful Life in Years. For example, an asset that costs $10,000 with a $1,000 salvage value and a 5 year life depreciates at $1,800 per year.
Salvage value, also called residual value or scrap value, is the estimated value of an asset at the end of its useful life. It is subtracted from the asset’s original cost to determine the total depreciable amount.
The useful life of an asset is the estimated number of years it will remain productive. The IRS provides asset class life guidelines for common business assets. Computers are typically 5 years, office furniture is 7 years, and residential rental property is 27.5 years under MACRS.
Straight line depreciation spreads the cost evenly over the asset’s life, resulting in the same expense each year. Declining balance depreciation applies a fixed rate to the remaining book value each year, giving higher depreciation in early years and lower amounts later. Straight line is simpler; declining balance may better match expenses to asset usage for certain assets.