Principles of Financial Accounting: Plant Assets and Intangibles Depreciation Methods StraightLine Units of Activity Declining Balance

What It Is

Depreciation is the allocation of the cost of a tangible asset over its useful life. It's an essential concept in financial accounting as it allows companies to match the cost of assets with the revenues they generate. For example, if a company buys a $10,000 delivery truck that's expected to last 5 years, the company would depreciate $2,000 per year ($10,000 ÷ 5 years).

Key Concepts & Formulas

• Straight-Line Method: Depreciation is calculated by dividing the asset's cost by its useful life. Depreciation Expense = (Asset Cost ÷ Useful Life). For example, if a company buys a $10,000 asset with a 5-year useful life, the annual depreciation expense would be $2,000 ($10,000 ÷ 5 years).
• Units of Activity Method: Depreciation is calculated by dividing the asset's cost by its total units of activity (e.g., miles driven). Depreciation Expense = (Asset Cost ÷ Total Units of Activity). For example, if a company buys a $10,000 delivery truck that's expected to last 100,000 miles, and it's driven 20,000 miles in the first year, the depreciation expense would be $1,000 ($10,000 ÷ 100,000 miles) × 20,000 miles.
• Declining Balance Method: Depreciation is calculated by multiplying the asset's book value by a percentage (e.g., 20%). Depreciation Expense = (Asset Book Value × Depreciation Rate). For example, if a company buys a $10,000 asset with a 20% depreciation rate, and its book value is $8,000 at the end of the first year, the depreciation expense would be $1,600 ($8,000 × 20%).
• Asset Book Value: The asset's cost minus accumulated depreciation. Asset Book Value = Asset Cost - Accumulated Depreciation. For example, if a company buys a $10,000 asset with $2,000 in accumulated depreciation, the asset's book value would be $8,000 ($10,000 - $2,000).
• Accumulated Depreciation: The total depreciation expense accumulated over the asset's useful life. Accumulated Depreciation = Total Depreciation Expense. For example, if a company depreciates $2,000 per year for 5 years, the accumulated depreciation would be $10,000 ($2,000 × 5 years).
• Depreciation Rate: The percentage of the asset's cost that's depreciated each year. Depreciation Rate = (Asset Cost ÷ Useful Life) × 100. For example, if a company depreciates $2,000 per year for a 5-year asset, the depreciation rate would be 40% ($2,000 ÷ $5,000 × 100).

Journal Entry Examples

1. Straight-Line Method:
   Dr. Depreciation Expense $2,000
   Cr. Accumulated Depreciation $2,000
   Explanation: The company is recognizing the depreciation expense for the year and increasing the accumulated depreciation account.

2. Units of Activity Method:
   Dr. Depreciation Expense $1,000
   Cr. Accumulated Depreciation $1,000
   Explanation: The company is recognizing the depreciation expense for the year based on the miles driven and increasing the accumulated depreciation account.

3. Declining Balance Method:
   Dr. Depreciation Expense $1,600
   Cr. Accumulated Depreciation $1,600
   Explanation: The company is recognizing the depreciation expense for the year based on the asset's book value and increasing the accumulated depreciation account.

Common Mistakes

1. Mistake: Confusing debits and credits for expense accounts.
   Correction: Remember that debits increase assets and expenses, while credits increase liabilities and equity. Use the mnemonic "ADE" (Assets, Drawings, Expenses) to help you remember.
2. Mistake: Not considering the asset's useful life when calculating depreciation.
   Correction: Make sure to calculate the asset's useful life and use it to determine the depreciation expense.
3. Mistake: Not updating the asset's book value after depreciation.
   Correction: Remember to update the asset's book value by subtracting the depreciation expense from the asset's cost.

Exam Tips

1. Tip: When calculating depreciation, make sure to use the correct formula and consider the asset's useful life.
2. Tip: Be careful when updating the asset's book value after depreciation, as it can affect the company's financial statements.
3. Tip: Remember that depreciation is an expense, not a liability, and it's recorded on the income statement.

Quick Practice

1. A company buys a $10,000 asset with a 5-year useful life. What is the annual depreciation expense using the straight-line method? Answer: $2,000. Explanation: The company would divide the asset's cost by its useful life to calculate the annual depreciation expense.
2. A company depreciates $2,000 per year for a 5-year asset. What is the accumulated depreciation after 3 years? Answer: $6,000. Explanation: The company would multiply the annual depreciation expense by the number of years to calculate the accumulated depreciation.
3. A company uses the declining balance method to depreciate an asset with a 20% depreciation rate. If the asset's book value is $8,000 at the end of the first year, what is the depreciation expense for the second year? Answer: $1,600. Explanation: The company would multiply the asset's book value by the depreciation rate to calculate the depreciation expense.

Last-Minute Cram Sheet

1. ⚠️ Depreciation is an expense, not a liability.
2. Depreciation Expense = (Asset Cost ÷ Useful Life).
3. Accumulated Depreciation = Total Depreciation Expense.
4. Asset Book Value = Asset Cost - Accumulated Depreciation.
5. ⚠️ Dividends are NOT an expense – they go directly to retained earnings.
6. Depreciation Rate = (Asset Cost ÷ Useful Life) × 100.
7. Straight-Line Method is the simplest method of depreciation.
8. Units of Activity Method is used for assets with a variable useful life.
9. Declining Balance Method is used for assets with a high depreciation rate.
10. ⚠️ Make sure to update the asset's book value after depreciation.