What Is Form 1125-A? Cost of Goods Sold, Line by Line

Form 1125-A is the IRS schedule that businesses use to calculate cost of goods sold and attach to their entity return. It rides along with Form 1120, 1120-S, 1065, 1120-C, or 1120-F, and the total on Line 8 flows to page 1 of the main return to reduce gross income. The form itself is one page with eight numbered lines, but the records behind those lines have to be clean, because cost of goods sold is one of the numbers the IRS looks at hardest.

Who Has to File It

The form is required whenever any of these entities claim a deduction for cost of goods sold:

  • C-corporations filing Form 1120
  • S-corporations filing Form 1120-S
  • Partnerships filing Form 1065
  • Cooperatives filing Form 1120-C
  • Foreign corporations filing Form 1120-F

If your entity files one of those returns and you deduct the cost of producing or purchasing the goods you sold, Form 1125-A attaches.1Internal Revenue Service. About Form 1125-A, Cost of Goods Sold

Sole proprietors do not use this form. If you run an unincorporated business and report on Schedule C of your personal Form 1040, cost of goods sold gets calculated in Part III of Schedule C instead. This trips people up often enough to say plainly: a sole proprietor searching for Form 1125-A almost certainly needs Schedule C.

The Small Business Exemption That Lets You Skip It

Not every business that sells physical products has to keep formal inventories. Under IRC Section 471(c), a small business taxpayer can treat inventory as non-incidental materials and supplies, or follow whatever method the business uses on its financial statements. Either route removes the need for formal inventory accounting, which removes the need for Form 1125-A.

You qualify as a small business taxpayer if your average annual gross receipts over the prior three tax years do not exceed $32 million for tax years beginning in 2026.2Internal Revenue Service. Revenue Procedure 2025-32 The threshold adjusts for inflation each year. Businesses meeting the test also get a companion benefit: exemption from the Section 263A uniform capitalization rules, which otherwise force you to capitalize indirect production costs into inventory.3Office of the Law Revision Counsel. 26 USC 263A – Capitalization and Inclusion in Inventory Costs of Certain Expenses Tax shelters cannot use the exemption regardless of receipts.

Clear the threshold or fail to qualify for another reason, and formal inventory accounting is required. Form 1125-A comes with it.

Line by Line

The math is simple addition and one subtraction. What matters is what belongs on each line.

  • Line 1, beginning inventory. The dollar value of all inventory on hand at the start of the tax year. This must match the ending inventory reported on last year’s return. If it doesn’t, the IRS notices.
  • Line 2, purchases. Total cost of raw materials, finished goods, or merchandise bought during the year, reduced by returns and by any items withdrawn for personal use. For partnerships, the cost of personally withdrawn items goes on Schedule K and K-1 as distributions to partners.4Internal Revenue Service. Form 1125-A (Rev. November 2024) Cost of Goods Sold
  • Line 3, cost of labor. Wages paid to employees directly involved in making or extracting your products. Assembly workers, machinists, and production-floor supervisors belong here. Administrative staff, salespeople, and office managers do not; their wages are indirect costs handled elsewhere.
  • Line 4, additional Section 263A costs. If your business is subject to the uniform capitalization rules, this line captures the indirect costs that must be capitalized into inventory, such as off-site storage, production-related insurance, and certain taxes. Attach a supporting schedule showing the breakdown.4Internal Revenue Service. Form 1125-A (Rev. November 2024) Cost of Goods Sold
  • Line 5, other costs. Production-related costs not captured on Lines 2 through 4. Freight, containers, packaging, and factory overhead are typical entries. Attach a schedule listing these in detail.4Internal Revenue Service. Form 1125-A (Rev. November 2024) Cost of Goods Sold
  • Line 6, total. Add Lines 1 through 5.
  • Line 7, ending inventory. The value of all unsold inventory at the close of the tax year.
  • Line 8, cost of goods sold. Subtract Line 7 from Line 6. This figure transfers to the appropriate line on the main return, generally page 1, Line 2.4Internal Revenue Service. Form 1125-A (Rev. November 2024) Cost of Goods Sold

Line 4 is where businesses over the $32 million threshold report the share of indirect costs that Section 263A forces into inventory, including rent on production facilities, depreciation of manufacturing equipment, utilities, quality control, and certain taxes.5eCFR. 26 CFR 1.263A-1 – Uniform Capitalization of Costs The allocation calculations can be involved, and mistakes there ripple through the entire cost of goods sold figure.

Inventory Valuation Methodsh2>

Below the eight calculation lines, the form asks how you value your inventory. The three standard options are cost, lower of cost or market, and other methods approved by the IRS. Within those categories, you also identify how you track the flow of goods, most commonly First-In, First-Out (FIFO) or Last-In, First-Out (LIFO).

The choice affects taxable income. LIFO assumes the most recently purchased items sell first, so during periods of rising prices it pushes higher costs onto the income statement and lowers reported profit. FIFO works the opposite way. Neither is inherently better; the right choice depends on product type, price trends, and long-term tax strategy.

Once you adopt a method, you cannot switch without filing Form 3115, Application for Change in Accounting Method.6Internal Revenue Service. Instructions for Form 3115 – Application for Change in Accounting Method Changes to inventory valuation, LIFO pool structures, and related accounting practices all go through that form. Switching without approval can trigger an adjustment that accelerates deferred tax into a single year.

Filing Deadlines and How to Submit

Form 1125-A is not filed on its own. It attaches to the entity’s primary tax return, so the deadline is whatever applies to that return. For calendar-year filers covering tax year 2025:

  • Partnerships (Form 1065): March 15, 2026
  • S-corporations (Form 1120-S): March 15, 2026
  • C-corporations (Form 1120): April 15, 2026

Those dates shift to the next business day if they land on a weekend or holiday.7Internal Revenue Service. Publication 509 (2026), Tax Calendars Fiscal-year filers use the 15th day of the 3rd month (partnerships and S-corps) or 4th month (C-corps) after the close of their tax year.

Most tax software attaches Form 1125-A automatically once you indicate the business maintains inventory, and it pulls the Line 8 total onto the main return. If you file on paper, place Form 1125-A immediately behind the primary return in your filing package.

What Errors Cost You

Form 1125-A does not generate its own standalone penalty. It is a supporting schedule, not an independent return. But an error in cost of goods sold changes taxable income directly, and that is where the penalties hit.

If an inflated cost of goods sold produces a substantial understatement of income tax, the IRS imposes an accuracy-related penalty equal to 20% of the resulting underpayment.8Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments For most taxpayers, an understatement is “substantial” when it exceeds the greater of 10% of the correct tax or $5,000. Corporations use a different threshold. If the IRS determines the error involved a gross valuation misstatement, the penalty doubles to 40%.

Beyond penalties, inconsistent cost of goods sold numbers are a common audit trigger. A beginning inventory that does not match last year’s ending inventory, sudden jumps in labor costs without corresponding revenue, or missing attached schedules for Lines 4 and 5 all draw scrutiny.

Records to Keep

The IRS generally recommends keeping business tax records for at least three years from the date you filed the return or the date it was due, whichever is later.9Internal Revenue Service. Taking Care of Business: Recordkeeping for Small Businesses That window tracks the standard audit statute of limitations. If the IRS suspects you underreported gross income by more than 25%, the window extends to six years. Employment tax records should be kept for at least four years.

For Form 1125-A specifically, the supporting documents are purchase invoices, supplier contracts, payroll records for production workers, freight bills, warehouse receipts, and any working papers used to calculate Section 263A allocations. Those records substantiate every line on the form, and producing them promptly during an inquiry is the fastest way to close it without adjustments.