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Understanding Inventory and COGS Methods

May 28, 2025

Inventory and Cost of Goods Sold: Key Points

Introduction

  • Inventory is a key asset for retailers, distributors, and manufacturers.
  • Includes goods awaiting sale, raw materials, and work-in-process.
  • Recorded on the balance sheet at cost.

Cost of Goods Sold (COGS)

  • When sold, inventory cost is removed and reported as COGS on the income statement.
  • COGS is usually the largest expense.
  • Subtracting COGS from sales gives gross profit.
  • Quick sale of inventory is crucial to maintain cash flow.

Cost Flow Methods

  • FIFO (First In, First Out): Oldest costs are reported as COGS; recent costs remain in inventory.
  • LIFO (Last In, First Out): Most recent costs are reported as COGS; oldest costs remain in inventory.
  • Weighted Average: Calculates an average cost per unit for COGS and inventory.

Inventory Systems

  • Periodic System: Inventory account updated periodically; end-of-year adjustments determine COGS and ending inventory.
  • Perpetual System: Continuously updates inventory; requires periodic physical counts for accuracy.

Estimating Inventory Costs

  • Gross Profit Method: Uses historical income data for estimating ending inventory.
  • Retail Method: Calculates cost-to-retail ratio to estimate inventory costs from retail data.

Examples

  • Corner Bookstore: Demonstrates the application of cost flow methods under periodic and perpetual inventory systems using hypothetical data.
  • Periodic FIFO/LIFO/Average: Calculations done at year-end.
  • Perpetual FIFO/LIFO/Average: Continuous calculations for each transaction.

Additional Concepts

  • Specific Identification: Items are expensed based on their specific cost.
  • LIFO Benefits: Can result in tax savings during inflation.
  • Inventory Management: Reducing inventory levels via just-in-time delivery can be beneficial.

Financial Ratios

  • Important ratios: Inventory Turnover Ratio and Days Sales in Inventory.

Conclusion

  • Choosing the right method depends on the company's circumstances and financial strategies.
  • Professional advice recommended for tax implications and inventory management strategies.

Further Study

  • Suggested quizzes and PRO Plus materials for deeper understanding and certification.