Lesson 5: Double-Declining Balance Method of Depreciation: Accelerated Cost Allocation

• What makes the Double-Declining Balance method “accelerated”?
• How does DDB differ from the Straight-Line method?
• Why does depreciation expense decrease each year under DDB?
• How does accelerated depreciation impact net income in early years?
• Why might a corporation choose an accelerated depreciation method?

• Double-Declining Balance (DDB)
• Accelerated depreciation
• Book value
• Accumulated depreciation
• Useful life
• Salvage value
• Depreciation rate
• Net income impact
• Cost allocation

B. Accounting Principles: Identify and describe GAAP principles and explain how application impacts financial reporting.

C. Accounting Process: Complete steps of the accounting cycle and analyze financial statement impact.

Analyze and describe how business transactions impact the accounting equation.

Students apply multi-step mathematical reasoning and justify analytical conclusions using numerical evidence. Students practice interpreting how changes in assumptions affect reported financial outcomes.

Description:

Students review the straight-line method and compare it to the Double-Declining Balance method.

Purpose:

This lesson expands students’ understanding of depreciation by introducing an accelerated method of cost allocation.

DOK 1: Define and calculate depreciation using DDB.
DOK 2: Apply DDB to structured problems.
DOK 3: Analyze how accelerated depreciation affects income and financial strategy.

Corporations may choose accelerated depreciation methods to match higher asset productivity in early years or to reduce taxable income in early periods.

• Salvage value is subtracted before calculating DDB each year.

• Step-by-step modeling of first-year DDB calculation
• Comparison chart: Straight-Line vs DDB
• Guided worksheet with structured calculation columns
• Excel depreciation schedule template
• Small group problem-solving
• Challenge extension: Compare income under two methods
• Spanish vocabulary support for ELL students

• Depreciation schedule worksheet
• Excel modeling assignment
• Exit ticket explaining why DDB results in higher early-year expense
• Short written analysis comparing DDB to Straight-Line
• Mini-case recommending a depreciation method with justification

• Century 21, Accounting, General Journal, 11th edition
• Online working papers (MindTap)
• Microsoft Excel software (depreciation modeling)
• Depreciation comparison chart
• Structured practice problem set
• Class notes, Do Now, Exit Tickets
• Projector for Excel walkthrough