Amazon seller terms, in plain English.
Definitions of the Amazon terms that show up in your profit dashboard, your fee statements, and your review requests — with a note on why each one actually moves your margin.
35 terms across 3 sections
Seller fundamentals
- ASIN(Amazon Standard Identification Number)
A 10-character code Amazon assigns to every product listing. One ASIN can be sold by multiple sellers competing for the same Buy Box, or represent a single seller's unique item.
Why it matters: ASIN is the anchor for profitability data — it's the level at which sales, fees, and margin actually need to be tracked, since a single SKU can map to one ASIN sold across several marketplaces.
- SKU(Stock Keeping Unit)
The seller's own internal code for a specific product variant — separate from Amazon's ASIN, and usually the identifier your inventory and accounting systems already use.
Why it matters: Profit swings are almost always a SKU-level story — one variant quietly losing money while the ASIN average still looks fine. Tracking margin per SKU, not just per listing, is what surfaces that.
- FBA(Fulfilled by Amazon)
A program where sellers ship inventory to Amazon's warehouses, and Amazon handles storage, packing, shipping, customer service, and returns for those orders.
Why it matters: FBA trades higher fees (fulfillment, storage, and several inventory-based charges) for Prime eligibility and less manual work — which only pays off if the fee stack is actually netted against the sale price per unit.
- FBM(Fulfilled by Merchant)
The seller stores, packs, and ships orders themselves (or through a third-party logistics provider) instead of using Amazon's warehouses.
Why it matters: FBM swaps Amazon's fulfillment fees for your own shipping and labor costs — a different cost structure that needs its own margin math rather than being lumped in with FBA SKUs.
- Seller Central
Amazon's web dashboard for managing listings, orders, inventory, advertising, and payouts. It's the source system that order and fee data ultimately comes from.
Why it matters: Seller Central shows raw order and fee data, but not real-time, per-SKU profit — that calculation (order revenue minus fees minus COGS) is the gap tools built on top of it, like InviPulse, are meant to close.
- Buy Box
The featured “Add to Cart” offer on a product page when multiple sellers list the same ASIN. Amazon awards it algorithmically based on price, fulfillment method, and seller performance.
Why it matters: Chasing the Buy Box with price cuts is only a good move if margin per unit is visible in real time — otherwise it's easy to win the Buy Box and lose money on every sale.
- Brand Registry
Amazon's program for verified trademark owners, unlocking brand protection tools, A+ Content, and access to programs like Amazon Vine.
Why it matters: Brand Registry is usually the gate that determines whether a seller can even run structured review-generation programs — worth knowing before planning a reviews strategy.
- A+ Content
Enhanced product page modules (images, comparison charts, brand story) available to Brand Registry sellers, replacing the plain text description.
Why it matters: A+ Content tends to lift conversion rate, not fees — so its payoff shows up in sales velocity per SKU rather than anywhere in the fee stack.
- Variation(Parent-Child listing)
A listing structure where one “parent” product groups several “child” ASINs that differ by size, color, or count — shown together on one product page.
Why it matters: Variations are the classic place profit hides — the parent listing's overall rating and sales look healthy while one specific child SKU is barely breaking even or running at a loss.
- Category Approval(Gating)
A requirement in certain product categories (e.g. grocery, beauty, some electronics) where sellers must apply and get approved by Amazon before listing.
Why it matters: Gated categories often carry different fee schedules and compliance costs, which is a reason not to assume the same margin model applies across every category a seller operates in.
- Marketplace
A regional storefront (Amazon.com, Amazon.co.uk, Amazon.in, Amazon.ca, and others) with its own currency, fee schedule, and local compliance requirements.
Why it matters: The same product can carry a different margin in each marketplace once local currency, referral fee bands, and shipping costs are factored in — profit has to be tracked per marketplace, not just per SKU.
Fees & profitability
- Referral Fee
A percentage of each item's sale price that Amazon charges for access to its marketplace — the rate varies by product category, typically in the 8–17% range.
Why it matters: Referral fees are usually the single largest deduction from revenue on every order, which makes them the first thing a real-time profit calculation has to pull in accurately.
- FBA Fulfillment Fee
A per-unit charge for picking, packing, and shipping an FBA order, based on the product's size tier and weight.
Why it matters: This fee is set by dimensions and weight, not price — so a small, cheap item and a bulky, cheap item can carry very different margins even at the same sale price.
- COGS(Cost of Goods Sold)
The direct cost to produce or acquire the unit being sold — manufacturing or wholesale cost, plus inbound freight and duties, before any Amazon fees.
Why it matters: COGS is the number Amazon's own reports never include — true profit per unit only exists once it's layered in against the sale price and every Amazon fee.
- Landed Cost
The total cost of a unit once it's ready to sell — unit cost, plus freight, customs duties, and any inspection or prep charges.
Why it matters: Using landed cost instead of just factory price avoids the most common way sellers overstate their own margin.
- Net Margin(Net Profit)
What's left from a sale after every cost is subtracted — referral fee, fulfillment fee, storage and other FBA charges, advertising spend, and COGS.
Why it matters: Revenue and order count can climb while net margin quietly shrinks — it's the number that actually tells a seller whether growth is profitable, which is why it needs to be visible per order, not just at month-end.
- Monthly Storage Fee
A per-cubic-foot charge for inventory sitting in Amazon's fulfillment centers, billed monthly and higher during the October–December peak season.
Why it matters: Storage fees erode margin on slow-moving SKUs specifically — a cost that's easy to miss until it's tracked against the individual SKU it applies to, rather than as one lump sum.
- Aged Inventory Surcharge
An additional fee on top of standard storage fees for units that have sat in an Amazon warehouse for an extended period (commonly past 181 or 271 days), scaling up the longer inventory stays.
Why it matters: This is one of the fastest ways a previously profitable SKU turns negative — inventory that isn't moving keeps accumulating cost with no matching revenue.
- Inbound Placement Service Fee
A per-unit fee for how Amazon distributes inbound shipments across its fulfillment network; it varies depending on whether the seller ships to one location or splits inventory across several.
Why it matters: This fee is set at the shipping-plan stage, before a single unit sells — it needs to be baked into per-unit cost assumptions up front, not discovered after the fact in a fee statement.
- Low-Inventory-Level Fee
A surcharge applied when a seller's FBA inventory for a SKU falls below the level needed to reliably meet demand, relative to how much of it sells.
Why it matters: It penalizes exactly the situation a seller can't always avoid — a stockout risk — which is why it needs to sit inside per-SKU margin tracking, not get treated as a rare, ignorable line item.
- Removal Fee
A per-unit charge for having Amazon return or dispose of inventory from a fulfillment center — an alternative to leaving stock to accumulate aged inventory surcharges.
Why it matters: Removal fees are a real cost of cutting losses on dead stock — factoring them in is what makes a “cut and move on” decision an informed one rather than a guess.
- Return Processing Fee
A fee charged on certain FBA categories (notably apparel) when a customer return is processed, on top of any refunded fulfillment fee.
Why it matters: High-return categories can look profitable on the initial sale and lose money once returns are factored in — margin has to account for the return rate, not just the sale price.
- Settlement Period
The roughly two-week cycle Amazon uses to batch orders, fees, and refunds before paying out the net balance to a seller's bank account.
Why it matters: Waiting for a settlement report means finding out margin two weeks after the fact — one reason real-time, order-level profit tracking catches problems a payout cycle would only reveal later.
- SP-API(Selling Partner API)
Amazon's official API for sellers and authorized third-party tools to read order, fee, and inventory data directly from Seller Central, with read and write permission scopes granted separately.
Why it matters: This is how a tool like InviPulse pulls order and fee data automatically — read-only access, no manual exports or spreadsheet uploads needed to see profit update in real time.
- Advertising Cost(Ad Spend)
The amount spent on Amazon Sponsored Products, Sponsored Brands, and other ad placements to drive traffic to a listing.
Why it matters: Ad spend has to come out before profit is real — a SKU can show strong sales and still lose money once its advertising cost is netted against the margin it generates.
- Refunds
Money returned to a buyer for a cancelled, returned, or disputed order — netted against a seller's balance rather than issued as a separate charge.
Why it matters: Refunds claw back revenue on a sale that already looked closed — profit tracking that doesn't count refunds as they happen will overstate margin until the next settlement corrects it.
- Unit Economics
The revenue, fees, and costs attributable to a single unit sold, boiled down to a profit-per-unit figure.
Why it matters: Unit economics is what answers “should I sell more of this SKU” — a question store-wide revenue or overall margin can't answer on its own.
- Payouts
The net funds Amazon transfers to a seller's bank account at the end of each settlement period, after fees, refunds, and adjustments are deducted from revenue.
Why it matters: The payout total is often the first place a seller notices something changed, but it lands days after the fact — real-time profit tracking is what shows the same shift as it happens, order by order.
Reviews & ratings
- Amazon Vine
An Amazon-run program (available to Brand Registry sellers) that gives free units to trusted reviewers in exchange for honest, disclosed reviews — priced per enrolled ASIN.
Why it matters: Vine's per-ASIN cost is a real marketing expense that eats into margin on that SKU, worth weighing against lower-cost ways of generating review volume, like automated post-purchase requests.
- Review Velocity
The rate at which a listing accumulates new reviews over time, rather than the total review count on its own.
Why it matters: A steady trickle of reviews after every order compounds into ranking and conversion advantages over time — which is the case for keeping review requests running consistently rather than only after a launch push.
- Product Reviews vs. Seller Feedback
Two separate systems: product reviews rate the item itself and live on the listing; seller feedback rates the buying experience (shipping speed, packaging, service) and lives on the seller's account page.
Why it matters: Amazon's review-request tools and policies treat these differently — knowing which one a request is actually asking for avoids wasted effort or a policy misstep.
- Star Rating
The 1–5 average shown on a listing, calculated from all product reviews (weighted by factors like recency and verified-purchase status, not a simple average).
Why it matters: A dip in star rating on a specific SKU is often an early signal of a quality or fulfillment issue that's also about to show up as returns and lost margin.
- Verified Purchase
A label Amazon applies to reviews from customers who bought the item at a genuine, non-heavily-discounted price through Amazon.
Why it matters: Verified reviews carry more weight with both Amazon's ranking algorithm and shoppers, which is why automated requests sent to real buyers outperform any workaround.
- Review Solicitation Policy
Amazon's rules governing how sellers may ask for reviews — no incentives, no requests targeted only at happy customers, and no review-gating.
Why it matters: Violations can mean lost review privileges or account action, which is why any automated review-request setup needs to send neutral, unconditional requests to every eligible buyer.
Most of these terms are line items in the same calculation. If you want to see them netted against each other per SKU rather than looked up one at a time, that is what real-time profit tracking does — and the blog works through several of them in detail, including how referral fees are actually computed.
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