Straight-Line Depreciation

Straight-Line Depreciation Definition

Straight-line depreciation is the simplest method of spreading the cost of a tangible asset evenly over its useful life. You take the purchase price, subtract the estimated salvage value (what it'll be worth at the end), and divide by the number of years you expect to use it. The result is the same depreciation expense recorded each year.

Straight-Line Depreciation in Practice — Example

A photography studio buys lighting equipment for $5,000. It estimates a 5-year useful life and a $500 salvage value. Annual depreciation: ($5,000 - $500) ÷ 5 = $900 per year. Each year for five years, the studio records $900 in depreciation expense, gradually reducing the asset's book value from $5,000 to $500. By year five, the equipment is "fully depreciated" at its salvage value.

Why Straight-Line Depreciation Matters for Your Books

Depreciation matches the cost of an asset to the periods that benefit from it. If you bought a $5,000 piece of equipment and expensed it all in year one, that year's P&L would look terrible while the next four years get the benefit for free. Depreciation smooths this out.

Straight-line is the go-to method because it's simple, predictable, and widely accepted. Most small businesses use it unless their accountant recommends an accelerated method for tax purposes. It works well for assets that provide consistent value year over year.

Depreciation also affects your tax bill. It's a non-cash expense that reduces taxable income. You don't write a check for depreciation — but it lowers the profit on which you pay taxes. Understanding this helps you plan for tax savings and capital expenditures.

How Straight-Line Depreciation Shows Up in QuickBooks

In QuickBooks Online, set up fixed assets in the Chart of Accounts (Other Assets → Fixed Assets). Create a corresponding "Accumulated Depreciation" contra-asset account. Record monthly or annual depreciation with a journal entry: debit Depreciation Expense, credit Accumulated Depreciation. QBO doesn't calculate depreciation automatically — you'll need to set up recurring journal entries or have your accountant calculate it. The net asset value (cost minus accumulated depreciation) appears on the Balance Sheet.

Common Mistakes

Expensing assets instead of depreciating them — purchases over your capitalization threshold (commonly $2,500) should be depreciated, not expensed immediately

Using the wrong useful life — the IRS publishes standard useful lives for different asset types; using incorrect estimates affects both your books and tax filings

Forgetting salvage value — assets rarely depreciate to zero; excluding salvage value overstates annual depreciation

FAQ

Q: What's the difference between straight-line and accelerated depreciation? A: Straight-line spreads the cost evenly. Accelerated methods (like double-declining balance or MACRS) front-load depreciation, giving you bigger deductions in early years. Accelerated methods are often used for tax purposes; straight-line is cleaner for financial reporting.

Q: Can I use Section 179 instead of depreciating? A: Yes — Section 179 allows you to expense the full cost of qualifying assets in the year of purchase (up to annual limits). This is a tax election, not a bookkeeping method. Your accountant can advise whether Section 179 or depreciation is better for your situation.

Related Terms

Tangible Asset

Overhead

Profit and Loss

Year-End Close

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