A profit and loss statement (P&L) for an Amazon business is a report that subtracts all costs — cost of goods sold, Amazon fees, advertising, returns, storage, and overhead — from revenue to show true net profit for a period. Amazon does not provide one. Seller Central shows sales, payouts, and fee transactions, but it never calculates your profit, because Amazon doesn’t know your product costs. Building an accurate P&L is the seller’s job, and the single most common place it goes wrong is COGS.
This guide covers how a proper Amazon seller P&L is structured, how to calculate COGS correctly, and the specific mistakes that make sellers believe they’re more profitable than they are.
Why your Seller Central payout is not your profit
The number Amazon deposits every two weeks is revenue minus Amazon’s fees minus reserves — nothing more. It excludes at least four major cost categories:
- Cost of goods sold. Amazon has no idea what you paid your supplier.
- Advertising billed separately. PPC is often deducted from disbursements, but many sellers pay part of it by credit card, so it never appears in the payout math.
- Costs that happen outside Amazon. Freight, duties, prep, software, VA salaries, insurance.
- Timing distortions. A payout covers a settlement period, not a calendar month, and includes reserve releases from prior periods.
A seller with a $42,000 monthly payout can be earning $9,000 or losing $3,000. The payout alone cannot tell you which.
The structure of an accurate Amazon P&L
An Amazon seller P&L should flow from gross sales down to net profit in clearly separated blocks:
| Line | What it includes |
| Gross revenue | Product sales + shipping charged + gift wrap |
| − Refunds | Refunded amount, including refunds where the item never comes back |
| = Net revenue | The real top line |
| − COGS | Landed cost of the units sold this period |
| = Gross profit | Product-level profitability before Amazon |
| − Amazon fees | Referral fees, FBA fulfillment fees, storage (monthly + aged), inbound placement, refund administration, disposal/removal |
| − Advertising | Sponsored Products, Brands, Display — attributed to the period the spend occurred |
| = Contribution margin | What your catalog actually contributes |
| − Operating expenses | Software, salaries, prep center, photography, accounting, loan interest |
| = Net profit | The number that matters |
Two principles make this structure work:
Accrual beats cash for decision-making. Record COGS when a unit sells, not when you pay the supplier. A $30,000 inventory purchase in March is not a March expense — it’s an asset that becomes an expense unit by unit as stock sells through. Cash-basis P&Ls show catastrophic months when you reorder and fantastic months when you don’t, and both are illusions.
Every line should be traceable to a SKU where possible. Account-level profit hides SKU-level losses. In most Amazon catalogs, a minority of ASINs generate the majority of profit while a few quietly destroy it — usually via returns or aged storage fees. A P&L you can’t break down by product is a scoreboard, not a tool.
How to calculate COGS for Amazon: landed cost, not invoice cost
Cost of goods sold for an Amazon seller is the fully landed cost per unit, multiplied by units sold in the period. Landed cost includes:
- Unit price paid to the supplier
- Inbound freight (sea/air from supplier to your warehouse or to Amazon), allocated per unit
- Customs duties and tariffs, allocated per unit
- Prep and labeling (poly bags, bundling, FNSKU labels, prep center fees)
- Domestic freight to Amazon fulfillment centers, if you pay it
- Payment costs on the purchase (wire fees, currency conversion spread)
A product invoiced at $4.20 per unit routinely lands at $5.60–$6.10 once freight, duty, and prep are allocated. A seller using $4.20 as COGS overstates gross margin on every single unit sold — permanently, invisibly, and compounding with volume.
The COGS mistakes that distort Amazon P&Ls
1. Using invoice cost instead of landed cost. The most common error. It flatters margin by 15–30% on typical imported goods, which is often the entire difference between a “profitable” product and a real one.
2. Expensing inventory purchases when paid. This is the cash-basis trap described above. It makes month-over-month comparison meaningless and hides your true run-rate profitability.
3. One blended COGS forever. Supplier prices change, freight rates swing dramatically (recent years have proven this repeatedly), and tariffs change with trade policy. COGS should be tracked per purchase batch. When a new batch lands at a different cost, margin on units from that batch is different. Averaging a 2024 freight rate into 2026 sales misstates today’s profitability.
4. Ignoring COGS on refunded and unsellable units. When a customer returns a unit that can’t be resold, you lose the product and most fees. When a refund is issued but the item never comes back, you’ve lost revenue and the unit. These write-offs belong in your P&L; most spreadsheets silently omit them.
5. Forgetting samples, giveaways, and lost inventory. Units sent to reviewers, damaged in transit, or lost by the fulfillment center (and not reimbursed) consumed cash. They should be expensed, not left floating in an inventory number that no longer reflects reality.
6. Treating cashback and supplier rebates inconsistently. If you negotiate a rebate or pay by a card with cashback, decide once whether it reduces COGS or sits as other income — and apply it the same way every month.
Amazon fees deserve their own block — all of them
Referral and FBA fulfillment fees are visible on every transaction, so sellers rarely miss them. The fees that erode P&L accuracy are the ones billed at account level or on separate schedules:
- Monthly storage fees, including the Q4 rates that are roughly triple the January–September rates
- Aged inventory surcharges on units stored 181+ days
- Inbound placement service fees
- Refund administration fees (Amazon keeps a portion of the referral fee when you refund)
- Removal, disposal, and liquidation fees
- Subscription, and where applicable, high-volume listing fees
These should map into your P&L monthly and, where possible, be allocated back to the SKUs that caused them. A product with healthy per-unit margin and 9 months of stock cover can be net-negative once its storage burden is allocated honestly.
A worked example
A private-label seller, one month, one SKU:
| Units sold | 1,000 |
| Net revenue (after refunds) | $24,300 |
| COGS at landed cost ($5.80 × 1,000) | −$5,800 |
| Referral fees (15%) | −$3,645 |
| FBA fulfillment fees ($4.15 × ~1,010 shipped) | −$4,192 |
| Storage (monthly + aged share) | −$610 |
| PPC | −$4,100 |
| Refund write-offs (32 unsellable units) | −$186 |
| Contribution margin | $5,767 (23.7%) |
The same month calculated with invoice cost ($4.20), no storage allocation, and no write-offs shows $7,963 — a 38% overstatement. Scale that across a catalog and a year, and a seller can spend twelve months reinvesting into products that were never actually profitable.
How often should an Amazon seller update their P&L?
Monthly is the minimum for accounting; daily is the standard for operating. Advertising performance, refund spikes, and fee changes move too fast for a month-end spreadsheet to catch. This is the core argument for automated profit analytics: a tool like sellerboard — a profit analytics platform for Amazon sellers — pulls every order, fee, refund, and PPC transaction from your account via API, applies your batch-level COGS, and maintains a live P&L by month, by product, and by marketplace. The spreadsheet version of the same discipline is possible; it simply costs hours per month and tends to die the first week you skip it.
FAQ
Does Amazon provide a profit and loss statement? No. Seller Central provides sales and transaction-level fee reports (the Payments report and Date Range reports), but it never subtracts your product costs. Any true P&L must be built outside Seller Central, in accounting software, a spreadsheet, or a profit analytics tool.
What counts as COGS for an Amazon FBA business? The landed cost of units sold in the period: supplier unit price plus allocated freight, duties, prep, labeling, and inbound shipping. It does not include Amazon fees or advertising — those are separate expense lines, not COGS.
Should Amazon fees be included in COGS? No. Keeping fees separate from COGS preserves the meaning of gross margin (product economics) versus contribution margin (product economics after Amazon and ads). Blending them makes it impossible to see whether a margin problem comes from sourcing or from fees.
Is cash or accrual accounting better for Amazon sellers? Accrual for management decisions, always — COGS recognized when units sell. Your tax accounting may legitimately differ by jurisdiction and business size; keep the management P&L accrual-based regardless.
How do I track COGS when my costs change between orders? Record cost per purchase batch and let each sale draw down the batch it shipped from (or use a weighted average recalculated on every receipt). Never overwrite history: if you correct your March landed cost, your March P&L should restate, not your July one.
