Understanding Net Income Overstatement:

Net Income (NI) = Revenue - Expenses

If net income is overstated, then expenses must be understated or revenue must be overstated.

Cost of Goods Sold (COGS) is an expense that directly affects net income.

Why Understated COGS Causes Overstated Net Income:

COGS = Beginning Inventory + Purchases - Ending Inventory

If COGS is understated, expenses are lower than they should be, resulting in a higher net income.

Why Other Options Are Incorrect:

A. Beginning inventory overstated: This would increase COGS (not decrease it), leading to a lower net income.

C. Ending inventory understated: This would increase COGS, reducing net income.

D. COGS overstated: This would result in a lower net income, not an overstatement.

IIA Standards and References:

IIA Standard 2120 – Risk Management: Internal auditors must assess financial misstatements and risks.

IIA Practice Guide: Auditing Financial Statement Close Processes (2018): Emphasizes accuracy in inventory and expense reporting.

COSO Internal Control – Integrated Framework: Supports accuracy in financial reporting and controls over misstated financial data.

Thus, the correct answer is B: Cost of goods sold was understated for the year.