Depreciation Methods Compared (Straight-Line vs Declining)

An asset does not lose its entire value the moment you buy it. It loses value slowly, year after year, and depreciation is the accounting tool that tracks that slow loss. Two methods handle the timing very differently: straight-line depreciation and declining-balance depreciation. This guide compares both, step by step, with a simple side-by-side example.

What Depreciation Actually Means

Depreciation is how a business spreads the cost of a big purchase over several years instead of one. Picture a company buying a $20,000 delivery van that will last about five years.

Expensing the full $20,000 on day one would make that year look far less profitable than it really was. The van keeps earning revenue for years, so accounting rules match a slice of its cost to each year it helps generate income.

Depreciation only applies to assets that wear out or lose value over time, like vehicles, machinery, and equipment. Land is a common exception, since it does not typically wear out the way physical equipment does.

Each year’s deduction lowers reported profit on the income statement, even though no extra cash leaves the business that year. On the balance sheet, the deductions build up in an account called accumulated depreciation, which tracks how much of an asset’s cost has already been written off.

That running total is exactly what an accumulated depreciation calculator is built to track for you, no matter which method a business chooses.

How Straight-Line Depreciation Works

Straight-line depreciation is the simplest method, and it is also the most common one. It spreads an asset’s cost evenly, so the deduction is exactly the same every single year.

The formula is straightforward. Subtract the asset’s estimated salvage value from its cost, then divide the result by its useful life in years.

Salvage value is what the asset might be worth once the business is done using it. Useful life is simply how many years it is expected to remain productive.

Because the deduction never changes, straight-line depreciation is easy to plan around. Many small businesses use it for simple assets like office furniture and buildings, for exactly that reason.

How Declining-Balance Depreciation Works

Declining-balance depreciation front-loads the deduction, giving a business a bigger write-off early and smaller ones later. It applies a fixed percentage rate to the asset’s remaining book value each year, not to its original cost.

Because the remaining book value shrinks every year, the dollar amount of each deduction shrinks along with it. A common version, called double-declining balance, uses a rate twice the straight-line percentage.

This pattern fits assets that genuinely lose most of their value early, like computers or vehicles that age quickly. Depreciation under this method usually slows down, or stops, once the book value nears the asset’s salvage value.

Straight-Line vs Declining-Balance at a Glance

The table below lines up the two methods on the points that matter most. Read it top to bottom to see how they differ in pattern and typical use.

Both methods are accepted accounting approaches, and both eventually deduct roughly the same total amount. The real difference is timing, meaning which years get the bigger deduction.

Why a Business Might Choose One Method Over the Other

The right method often depends on how an asset actually loses value in real life. A method that mirrors real wear and tear gives a more accurate financial picture.

Straight-line depreciation fits assets that hold their usefulness at a steady pace, like a building or basic office furniture. The even deduction also makes budgeting and forecasting simpler for a small business.

Declining-balance depreciation fits assets that lose most of their value fast, like a computer or a delivery vehicle. Some businesses also favor declining-balance for tax timing reasons, since larger early deductions can lower taxable income sooner.

These tax timing effects vary by country, industry, and specific situation, so this is a general concept, not specific tax guidance. A tax professional can advise on which method fits a particular asset and business.

A Simple Worked Example (Illustrative Only)

Here is a simple example using made-up numbers, just to show how the math plays out. Imagine a business buys equipment for $20,000, plans to use it for five years, and estimates a $2,000 salvage value.

Under straight-line depreciation, the yearly deduction is $20,000 minus $2,000, divided by 5, which equals $3,600 every single year.

Under double-declining balance, the rate is twice the straight-line rate, or 40 percent, applied to the remaining book value each year. Year one applies 40 percent to the full $20,000, for an $8,000 deduction.

Notice that both methods deduct the same asset cost overall, just on a different schedule. Declining-balance front-loads the write-off, while straight-line spreads it evenly across every year.

By year five, the declining-balance deduction would keep shrinking until the equipment’s book value nears its $2,000 salvage value. At that point, depreciation under this method typically slows down or stops.

Add up the straight-line column across all five years and it totals $18,000, which is the full depreciable cost. Add up the declining-balance column across the same five years, and it lands on roughly that same $18,000 total, just reached on a very different schedule.

Where the Accumulated Depreciation Calculator Fits In

Running these formulas by hand for every asset gets tedious fast, especially with several pieces of equipment on the books. The Accumulated Depreciation Calculator does the math for you, for either method.

Enter an asset’s cost, salvage value, and useful life, and the calculator shows the yearly deduction and the running total. You can compare straight-line and declining-balance side by side before deciding which fits your books.

Depreciation and Other Business Numbers

Depreciation shows up in more places than just the balance sheet. It is also one of the items added back when calculating EBITDA, a measure of a company’s core operating profit.

That is because EBITDA tries to strip out financing and accounting choices, including which depreciation method a business happens to use. Our guide on EBITDA explained simply breaks down how that add-back works and why analysts rely on it.

Understanding depreciation also helps when reading a company’s cash flow, since depreciation is a non-cash expense. It reduces reported profit without an actual cash payment leaving the business that year.

FAQs About Depreciation Methods

Sources

This article is for general education only, not financial or accounting advice. Business situations vary, so confirm your specific numbers with an accountant or financial advisor. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated September 15, 2026.