Rule Atlas
IRC § 471(c): Inventory Accounting for Businesses: COGS, FIFO, LIFO, and Valuation
Under IRC § 471(c) (IRS / Treasury Circular 230), inventory Accounting for Businesses: COGS, FIFO, LIFO, and Valuation establishes the authoritative rules tested on the IRS Enrolled Agent (EA). Master the critical inventory costing methods (FIFO, LIFO) for the SEE exam. VoraPrep verifies every threshold, worked table, and practice question below against the current IRS Enrolled Agent (EA) blueprint.
Worked Example: FIFO vs. LIFO in a Period of Rising Costs
| Date | Transaction | Units | Unit Cost | Total Cost |
|---|---|---|---|---|
| Jan 1 | Beg. Inv. | 100 | $10 | $1,000 |
| Mar 15 | Purchase | 200 | $12 | $2,400 |
| Sep 1 | Purchase | 300 | $15 | $4,500 |
| Total Available for Sale | 600 | $7,900 |
Apex Manufacturing, a C corporation, has used the FIFO method for inventory valuation since its inception. For the current tax year, Apex wants to switch to the weighted-average method to better reflect its cost of goods sold. What is the primary form Apex must file with the IRS to request this change in accounting method?
Worked Example: FIFO vs. LIFO in a Period of Rising Costs
Scenario. GadgetCo, a calendar-year C corporation, sells a single product. During 2025, a period of rising costs, its inventory activity was as follows:
- | Date | Transaction | Units | Unit Cost | Total Cost | |---|---|---|---|---| | Jan 1 | Beg. Inv. | 100 | $10 | $1,000 | | Mar 15 | Purchase | 200 | $12 | $2,400 | | Sep 1 | Purchase | 300 | $15 | $4,500 | | Total Available for Sale | | 600 | | $7,900 |
- GadgetCo sold 450 units during the year. The question asks for the Cost of Goods Sold (COGS) to be reported on its Form 1125-A under the LIFO method.
- Step 1: Confirm Goods Available for Sale (GAFS) The total cost of all inventory the company could have sold is $7,900 (100 units @ $10 + 200 units @ $12 + 300 units @ $15).
- Step 2: Apply the LIFO Method to the 450 Units Sold LIFO assumes the last units purchased are the first ones sold. We work backward from the most recent purchase to account for the 450 units sold. From the Sep 1 purchase: 300 units @ $15 = $4,500 From the Mar 15 purchase: 150 units @ $12 = $1,800 Total units accounted for: 300 + 150 = 450.
Common IRS Enrolled Agent (EA) Distractors on IRC § 471(c)
- 1Every inventory question on the SEE follows the same underlying structure. Use this 5-step decision framework and you'll rarely miss one:
- 2Step 1. Identify the question's goal. Is it asking for Cost of Goods Sold (COGS), Ending Inventory value, or the impact on gross profit? The goal dictates which side of the inventory equation (GAFS = COGS + Ending Inventory) you need to solve for.
- 3Use this memory aid to recall the effects of FIFO and LIFO during inflationary (rising price) periods:
- 4LIFO leads to LOWer Tax: The most recent, higher costs are expensed first, resulting in higher COGS and thus LOWer taxable income.
- 5FIFO is Fatter Profit: The older, lower costs are expensed first, resulting in lower COGS and thus Fatter (higher) taxable income.
Frequently Asked Questions: IRC § 471(c)
What is the core rule under IRC § 471(c) (Inventory Accounting for Businesses: COGS, FIFO, LIFO, and Valuation)?
Under IRC § 471(c) (IRS / Treasury Circular 230), inventory Accounting for Businesses: COGS, FIFO, LIFO, and Valuation establishes the authoritative rules tested on the IRS Enrolled Agent (EA). Master the critical inventory costing methods (FIFO, LIFO) for the SEE exam. VoraPrep verifies every threshold, worked table, and practice question below against the current IRS Enrolled Agent (EA) blueprint.
How is IRC § 471(c) tested on the IRS Enrolled Agent (EA)?
Every inventory question on the SEE follows the same underlying structure. Use this 5-step decision framework and you'll rarely miss one: Step 1. Identify the question's goal. Is it asking for Cost of Goods Sold (COGS), Ending Inventory value, or the impact on gross profit? The goal dictates which side of the inventory equation (GAFS = COGS + Ending Inventory) you need to solve for.
Where can I practice IRS Enrolled Agent (EA) questions on Inventory Accounting for Businesses: COGS, FIFO, LIFO, and Valuation?
Test yourself instantly with the free playable IRS Enrolled Agent (EA) question on this page, or launch VoraPrep's full IRS Enrolled Agent (EA) adaptive question bank, interactive lessons, and 1:1 exam simulator at voraprep.com/ea-prep.