How do I compare FIFO, LIFO and weighted average inventory valuation?
- Expert answer
- Undergraduate
- Asked
The question
My financial accounting assignment asks me to compare FIFO, LIFO and weighted average inventory valuation.
I need to explain the effect on COGS, closing inventory and profit.
Short answer
FIFO assumes the earliest purchases are sold first, weighted average uses an average unit cost, and LIFO assumes latest purchases are sold first. In rising prices, FIFO usually gives lower COGS and higher profit than LIFO.
Full expert answer
Accounting tutor
ACCA-qualified accountant, MSc Accounting
Inventory valuation affects cost of goods sold, closing inventory, gross profit and tax-related discussion. A strong assignment answer explains the logic of each method and how price changes affect the financial statements.
What the question is asking
The question is asking you to compare costing assumptions. The physical goods may not actually move in the same order as the accounting assumption. You need to show the financial effect.
Key concepts to cover
- FIFO: first in, first out
- LIFO: last in, first out
- Weighted average cost
- Cost of goods sold
- Closing inventory
- Gross profit
- Rising and falling prices
- IFRS treatment where relevant
Mini example
Opening inventory: 10 units at 5 each. New purchase: 10 units at 7 each. Sales: 12 units.
Under FIFO, the 12 units sold include 10 at 5 and 2 at 7:
textCOGS = 50 + 14 = 64Weighted average cost:
textaverage cost = (50 + 70) / 20 = 6 per unit
COGS = 12 x 6 = 72If LIFO is allowed in the context, latest costs are sold first:
textCOGS = 10 x 7 + 2 x 5 = 80Sample questions and short answers
1. Which method gives higher profit in inflation?
FIFO usually gives higher profit because older, cheaper costs are charged to COGS.
2. Which method gives higher closing inventory in inflation?
FIFO usually gives higher closing inventory because recent higher costs remain in inventory.
3. Is LIFO allowed under IFRS?
No. IFRS does not permit LIFO for inventory valuation.
4. Why use weighted average?
It smooths price fluctuations and is practical when units are similar.
Common student mistakes
- Confusing physical flow with cost flow
- Forgetting the impact on gross profit
- Ignoring rising or falling price context
- Using LIFO in an IFRS answer without noting treatment
- Not showing calculations
Related questions
- How should a company record revenue recognition for goods sold on credit?
- How do I calculate liquidity, profitability and solvency ratios for a retail company?
- How do I prepare a cash flow statement using the indirect method?
Academic use note
Use this as a method guide. Follow the accounting standards and country context specified in your assignment.
Sources and further reading
This answer explains a method for you to apply to your own work. Copying it into a submission would count as plagiarism, and it is indexed by similarity checkers.
All questions