COGS Tax Rules For US Retailers: Deductions, Records, And Common IRS Audits

Cost of Goods Sold The direct cost attributable to producing or acquiring the products sold. For US retailers this phrase has tax consequences — what you include in COGS affects taxable income, reporting on business returns, and what the IRS examines during audits.

What The IRS Requires Retailers To Include

The IRS defines COGS components that generally must be capitalized into inventory: beginning inventory, purchases, direct labor, direct materials, and certain factory overhead. Retailers report COGS on business tax returns (Form 1125-A for corporations; Schedule C lines for sole proprietors may require similar reporting). Freight-in, customs duties, and handling costs that are necessary to bring goods to sellable condition are typically included.

Key Tax Rules And Considerations

• Inventory Accounting Method: You must use a consistent inventory method for tax (periodic or perpetual) and choose a cost method (FIFO, average, or LIFO where permitted).
• Tax Forms: Corporations and partnerships often use Form 1125-A to report COGS; sole proprietors include COGS on Schedule C with supporting schedules.
• Section 263A (Uniform Capitalization): Certain costs for producing or acquiring property must be capitalized; retailers should confirm applicability—especially if they perform significant production or resale preparation.
• Lower Of Cost Or Market: For tax and financial reporting, inventory may need write-downs when market value falls below cost; treatment depends on method and tax rules.

Records To Keep For Tax Compliance

Maintain clear, contemporaneous records that support amounts included in COGS:

• Purchase Invoices: Supplier invoices and proof of payment for goods, duties, and freight-in.
• Receiving Reports: Warehouse receipts showing quantities and condition at receipt.
• Inventory Counts: Cycle count logs and year-end physical count records reconciled to book inventory.
• Allocation Workpapers: Documentation for overhead allocation methods and calculations.
• Customs Documentation: Import paperwork and landed cost calculations for cross-border shipments.

Common IRS Audit Triggers And How To Avoid Them

Retailers often draw IRS attention when margins fluctuate unexpectedly, inventory levels shift sharply, or COGS adjustments lack documentation. Avoid red flags by keeping consistent policies, reconciling inventory to books regularly, and retaining proof of shipments, returns, and loss adjustments. Rapid growth, significant returns, and frequent write-offs are typical audit catalysts—document the operational reasons for those events.

Practical Steps For Tax Filing

1) Reconcile beginning inventory on your tax return to the prior year’s ending inventory. 2) Capture all qualifying costs at receipt (freight-in, duties) and record them in your inventory ledger. 3) Choose and document a costing method; change methods only with appropriate tax filings and justification. 4) Prepare supporting schedules for Form 1125-A and retain workpapers for at least the statutory period relevant to tax audits.

When To Get Professional Help

Consult a tax CPA when you import goods, use complex allocation methods, change inventory accounting methods, or when your business has mixed activities (resale and manufacturing). A CPA can help ensure compliance with Section 263A, advise on LIFO election implications, and prepare defensible schedules if audited.

In short, the Cost of Goods Sold reported by US retailers affects taxable income and requires clear documentation and consistent methods. Capture landed costs accurately, keep detailed records that support inventory and overhead allocations, and coordinate accounting policies with tax advisors to reduce audit risk and ensure correct tax reporting.