Accounting & Bookkeeping

Understanding Depreciation Formula, Expense, and Key Insights

Depreciation Formula
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Depreciation is an essential accounting principle. It offers companies a structured method for distributing the expense of physical assets throughout their useful lifespans. Depreciation affects financial reporting and influences tax calculations, so it is essential for business owners and accountants alike to understand its implications.

In this blog, we’ll explain the depreciation formula, explore whether depreciation is a fixed or variable cost, and discuss its role in financial management. If you’ve ever wondered how to calculate depreciation or asked, “What asset cannot be depreciated?” you’re in the right place.

Table of Contents

What Is Depreciation and Why Does It Matter?

Depreciation is the gradual decrease in the worth of a fixed asset caused by wear and tear, use, or becoming outdated. For businesses, it serves two primary purposes:

  1. Accurate Financial Reporting: Depreciation reflects the decreasing value of assets on financial statements.

  1. Tax Benefits: It allows businesses to claim deductions, reducing taxable income.

Depreciation, which distributes the expense of an asset throughout its useful life, accurately represents a company’s financial condition and assists in planning for asset replacement. Businesses often rely on accounting services or CFO services to ensure proper depreciation calculations and compliance with tax laws.

How Does the Depreciation Formula Work?

The depreciation formula varies based on the method used, with the most common being:

1. Straight-Line Depreciation Formula

This is the simplest and most widely used method:

Depreciation Expense = (Cost of Asset – Salvage Value) / Useful Life

  • Cost of Asset: The purchase price of the asset, including installation costs.
  • Salvage Value: The projected worth of the asset when it reaches the end of its useful life.
  • Useful Life: The anticipated lifespan (in years) for which the asset will be operational.

For instance, if you acquire machinery costing $20,000 with a residual value of $2,000 and an expected lifespan of 5 years, the yearly depreciation would be:


($20,000 – $2,000) / 5 = $3,600 per year.

2. Declining Balance Method

This accelerates depreciation in the early years:


Depreciation Expense = Book Value × Depreciation Rate

3. Units of Production Method

This is based on usage:


Depreciation Expense = (Cost – Salvage Value) × (Units Produced in Year / Total Units)

Consulting with bookkeeping services ensures the correct method is applied based on your industry and asset type.

Depreciation Formula

Is Depreciation a Fixed or Variable Cost?

Understanding whether depreciation is a fixed or variable cost is essential for budgeting:

  • Fixed Cost: Depreciation is typically considered a fixed cost because it doesn’t fluctuate with production levels or sales.

  • Variable Aspect: However, methods like units of production tie depreciation to output, adding a variable component.

For most businesses, depreciation is categorized as a fixed expense, which makes it predictable and easier to manage in financial planning.

Is Depreciation an Operating Expense?

The classification of depreciation depends on its context:

  • Operating Expense: If the asset directly contributes to revenue-generating activities, its depreciation, such as the depreciation of factory machinery, is considered an operating expense.

  • Non-Operating Expense: If the asset is not tied to core operations, like office furniture, depreciation may be categorized differently.

Understanding this distinction is vital for accurate financial reporting. Experts in CFO services or accounting services can help you classify expenses appropriately.

What Is a Fixed Asset?

Fixed assets are long-term tangible assets used in business operations, such as machinery, buildings, and vehicles.

Depreciating Fixed Assets

Depreciation accounts for the gradual loss of value in fixed assets, helping businesses:

  • Reflect the actual value of their assets.
  • Plan for future replacements.
  • Optimize tax deductions by recognizing depreciation expense.

It’s worth noting that bookkeeping services play a crucial role in accurately tracking and calculating fixed asset depreciation.

What Asset Cannot Be Depreciated?

While most tangible assets can be depreciated, certain assets are exempt:

  1. Land: Its value typically appreciates over time, so it cannot be depreciated.

  1. Inventory: As it is sold or consumed within a short time, it doesn’t qualify for depreciation.

  1. Personal Use Assets: Items not used for business purposes.

  1. Investments: Stocks, bonds, and similar assets are not subject to depreciation.

Knowing which assets qualify is key to ensuring compliance with tax regulations. Professional tax services can help identify eligible assets and calculate depreciation correctly.

How to Calculate Depreciation: Practical Steps

Calculating depreciation requires accurate data and the correct method. Here’s a step-by-step guide:

  1. Determine the Cost of the Asset: Include the purchase price and any installation or delivery costs.

  1. Estimate the Salvage Value: The expected residual value of the asset.

  1. Assess the Useful Life: The estimated duration for which the asset will be productive.

  1. Choose a Depreciation Method: Straight-line, declining balance, or units of production.

  1. Perform the Calculation: Apply the selected method using the depreciation formula.

For businesses managing multiple assets, leveraging CFO services or bookkeeping services can streamline the process.

Why Depreciation Matters for Tax Planning

Depreciation directly impacts a company’s taxable income, making it a crucial consideration for tax planning. By reducing your taxable income, depreciation lowers the overall tax liability.

Professional tax services can help you:

  • Maximize allowable deductions.
  • Ensure compliance with Internal Revenue Services IRS regulations.
  • Plan for asset replacement through tax savings.
Depreciation Formula

Simplify Depreciation with Profitjets

Depreciation can be complex, but it doesn’t have to be overwhelming. At Profitjets, we offer a range of services to help businesses manage their finances effectively:

  • Tax Services: Maximize deductions and minimize liabilities.

  • CFO Services: Strategic insights for long-term financial planning.

FAQs About Depreciation

What Is Depreciation Expense?

Depreciation expense refers to the share of an asset’s cost assigned to a particular accounting period, which is usually annual.

Is Depreciation an Operating Expense?

Depreciation can be an operating expense if the asset contributes directly to revenue generation, such as factory equipment.

How Do I Know What Asset Cannot Be Depreciated?

Assets like land, inventory, and personal-use items are exempt from depreciation. Consult accounting services for clarification.

Can I Use Different Depreciation Methods for Tax and Financial Reporting?

Yes, businesses often use separate methods for tax purposes (e.g., accelerated depreciation) and financial reporting (e.g., straight-line).