Schedule C Lines 3, 4 & 5: How Returns, Cost of Goods Sold & Gross Profit Fit Together (2026)

Published: July 8, 2026 · Reading time: 7 min

TL;DR: The top of Schedule C is a short subtraction chain. Line 1 (gross receipts) minus Line 2 (returns and allowances) = Line 3 (net receipts). Line 4 is cost of goods sold, carried down from Part III. Line 5 is gross profit — Line 3 minus Line 4. Add Line 6 (other income) and you reach Line 7 (gross income). If you sell services with no inventory, Line 4 is $0 and Line 5 equals Line 3 — you skip Part III. If you sell products, Lines 4 and 5 are where your inventory cost quietly lowers your income before any Part II deduction.

Most freelancers can name Line 1 (the money that came in) and Line 31 (the profit that gets taxed). The three lines in between — 3, 4, and 5 — get filled in by tax software and never thought about again. But if you sell anything physical, these lines decide how much of your revenue is even counted as income before deductions start. Here's exactly how the top of Schedule C is built for 2026.

The Chain: From Sales to Gross Profit

Schedule C's income section is a step-by-step calculation, not five independent boxes. Each line feeds the next:

The whole point of the chain is to arrive at gross income (Line 7) — the figure every Part II deduction is subtracted from, and the number the IRS matches against your 1099s.

Line 3: Net Receipts (What You Actually Kept)

Line 3 is simply Line 1 minus Line 2. You report all your sales on Line 1, subtract returns and allowances on Line 2, and Line 3 shows what's left.

• Returns = refunds for products a customer sent back.
• Allowances = discounts you gave after the sale for a defect or a problem, without a full return.

For a service freelancer, Line 2 is almost always blank, so Line 3 equals Line 1. For a product seller, this is where refunds you processed through Etsy, Shopify, or PayPal come out — so track them, because your Line 1 total should include gross sales and Line 2 should catch the give-backs.

Reconciliation tip: Your Line 1 must include all income — cash, checks, Venmo, PayPal — not just the totals on your 1099-NEC and 1099-K forms. A payment processor reports gross sales before refunds, so subtracting refunds on Line 2 is often what makes your Schedule C reconcile with a 1099-K.

Line 4: Cost of Goods Sold (Carried Down From Part III)

Line 4 is not a number you type in — it flows down from Part III, Line 42. Part III is the inventory worksheet, and it does one job: figure out the direct cost of the goods you actually sold this year (not everything you bought).

The Part III logic:

1. Beginning inventory (what you had January 1)
2. + Purchases of goods for resale
3. + Cost of labor, materials, and supplies that go into the product
4. − Ending inventory (what's still on the shelf December 31)
5. = Cost of goods sold → lands on Line 4

The ending-inventory subtraction is the key: unsold stock is not an expense yet. You only get to count the cost of items once they've sold. That's why a reseller who buys $10,000 of inventory but sells only half of it reports roughly $5,000 of COGS on Line 4, not $10,000 — the rest is inventory valued on Lines 33 & 34.

Who has a Line 4 number: Etsy sellers, eBay and Amazon resellers, home bakers, florists, and makers who sell a physical product. Who leaves it blank: anyone selling only services or their own labor.

Line 5: Gross Profit

Line 5 = Line 3 − Line 4. It's the profit on your products before any operating expense.

• Service business: Line 4 is $0, so Line 5 = Line 3 = Line 1. Nothing to calculate — your receipts flow straight to gross profit.
• Product business: Line 5 is your markup — sales minus the cost of what you sold. A $40,000-sales shop with $16,000 of COGS shows $24,000 of gross profit on Line 5.

Line 5 is a useful health check on its own: it's your gross margin. If Line 5 is thin relative to Line 3, your products cost too much to make or you're pricing too low — a signal no Part II deduction will fix.

The Mistake That Costs Sellers Money: COGS ≠ Deductions

Here's the distinction that confuses nearly every new product seller:

• Cost of goods sold (Line 4) is subtracted above gross income — the cost of the inventory itself.
• Business deductions (Part II) are subtracted below gross income — your operating costs like software, advertising, mileage, and the home office.

They reduce your tax the same way in the end, but you must never count the same dollar in both places. Shipping supplies, packaging, and materials that become part of the product can go through COGS; the software you use to run the shop is a Part II deduction. Pick one lane per cost and stay in it.

Why it matters: COGS reduces both your income tax and your self-employment tax, exactly like a Part II deduction. So the goal isn't to route costs to COGS for a tax edge — it's to classify each cost correctly so your Schedule C is accurate and audit-ready.

A Worked Example

Maya runs a small ceramics shop on Etsy. In 2026 she has:

• $52,000 in gross sales → Line 1
• $2,000 in refunds for broken-in-shipping pieces → Line 2
• $50,000 net receipts → Line 3
• $18,000 cost of goods sold (clay, glaze, kiln firing, packaging that ships with the product), from Part III → Line 4
• $32,000 gross profit → Line 5
• $0 other income → Line 6
• $32,000 gross income → Line 7

Only after Line 7 does Maya subtract her Part II operating expenses — her studio home office, her design software, and her mileage to the post office. The top of the form did its job: it turned $52,000 of sales into the $32,000 of income her deductions get subtracted from.

Keeping Lines 3–5 Audit-Proof

1. Track refunds separately so Line 2 is accurate and Line 3 reconciles with your 1099-K.
2. Count inventory at year-end — the ending-inventory number drives your Line 4 COGS.
3. Tag every cost as COGS or operating expense the moment you record it, so nothing is double-counted or missed.
4. Keep the receipts — the itemized records that make a purchase IRS-valid, whether it's inventory or overhead.

Frequently Asked Questions

What is the difference between Schedule C Line 3, Line 4, and Line 5?

Line 3 is gross receipts minus returns and allowances (net sales). Line 4 is cost of goods sold, carried down from Part III. Line 5 is gross profit — Line 3 minus Line 4. A service business leaves Line 4 blank, so Line 5 equals Line 3.

Do freelancers with no inventory fill in Line 4 and Line 5?

No inventory means no cost of goods sold, so Line 4 is $0 and Line 5 equals Line 3. You skip Part III entirely. Lines 4 and 5 exist for businesses that buy or make products to resell.

Where does the number on Line 4 come from?

It's carried down from Part III, Line 42 — the inventory worksheet that subtracts ending inventory from beginning inventory plus purchases and materials to find the cost of goods actually sold.

Is cost of goods sold the same as a business deduction?

No. COGS is subtracted above gross income; operating deductions are subtracted below it in Part II. Both lower your tax, but a cost is either COGS or an operating expense — never both.

What are "returns and allowances" on Line 2?

Refunds for returned products and price reductions (allowances) for defective goods. You report total sales on Line 1 and subtract these on Line 2 so Line 3 reflects what you kept.

Authoritative References

• IRS Schedule C (Form 1040) and Instructions
• IRS Publication 334 — Tax Guide for Small Business
• IRS — Inventory / Cost of Goods Sold guidance
• IRS — Recordkeeping for Small Businesses

Track Every Cost — COGS and Overhead — in One Place

The top of Schedule C only works if your inventory costs and your operating costs are cleanly separated all year. CentSense scans every receipt with AI, lets you tag each one as cost of goods sold or a specific Part II Schedule C line, and tracks mileage at the 2026 rate of $0.725/mile — then exports a CPA-ready CSV where nothing is double-counted or missing. Start free with 10 AI scans a month — no credit card required; the Solo plan ($5/month) adds unlimited scanning and mileage tracking.

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This article is educational and not tax advice. Consult a qualified tax professional about your specific situation.