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Seller glossary with examples

By L-Guard · Published

A glossary for Amazon sellers: ASIN, SKU, FNSKU, fees, inventory and payouts. Plain definitions, fictional examples and dated sources from L-Guard.

A

Account Health Rating

Amazon's score for an account's health, from 0 to 1000: 200 and above is Healthy, 100 to 199 At risk, below that Unhealthy.

Example: an account rated 200 is in the Healthy band; a drop to 199 would put it At risk.

Where you see it: The Account health status in the top bar of every page (classic: Performance › Account Health)

Rule: Account health targets, checked . Change log: Account health targets

Sources:

Lesson: Seller account tour

Aged-inventory snapshot

The count on the 15th of each month of how long your units have been in Amazon's warehouses. The aged-inventory fee uses it.

Example: units of a kitchen product that are 181 days old or more on count day add an aged-inventory fee.

Where you see it: Supply chain › Manage Amazon inventory › Manage FBA inventory (classic: Inventory › Manage FBA Inventory)

Rule: Aged-inventory monthly count, checked .

Sources:

ASIN

Amazon's identifier for a catalog product; offers from sellers of that same product share its product page.

Example: B0SIM00001 is the fictional ASIN for the silver water bottle.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Sources:

Lesson: ASIN, SKU and FNSKU

B

Brand owner

A seller enrolled in Brand Registry for a brand. When Amazon replaces an over-limit title, a brand owner gets 14 days to review it.

Example: if the seller of the Hearthline cutting boards is enrolled in Brand Registry for Hearthline, they are its brand owner.

Rule: Title length limit, effective ; checked . Change log: Title length limit

Sources:

Lesson: Product title rules

C

Commingling

Pooling identical units from different sellers under one barcode. Amazon ended it for inventory shipped from Mar 31, 2026; label details need verification.

Example: two sellers send Amazon the same made-up water bottle; with commingling, a buyer could get either seller’s unit.

Rule: End of commingling, effective ; checked .

Sources:

Lesson: ASIN, SKU and FNSKU

Cubic foot

Cu ft: the space of a box one foot on each side. Storage and most aged-inventory fees are charged per cubic foot of your units.

Example: a carton of kitchen containers is charged storage each month for the cubic feet its units take up.

Where you see it: Supply chain › Manage Amazon inventory › Manage FBA inventory (classic: Inventory › Manage FBA Inventory)

Rule: Monthly storage fees by season, checked .

Sources:

D

DD+7

Sales money held through 7 full days after delivery under the standard reserve. Extensions and payout scheduling can delay receipt.

Example: a water bottle delivered on Monday completes 7 full reserve days on the following Monday. Under the standard policy without an extension, the funds become eligible on Tuesday; the next payout may be later.

Where you see it: Finance › Manage payments (classic: Payments › Payments Dashboard)

Rule: DD+7 payouts, effective ; checked . Change log: DD+7 payouts

Sources:

Lesson: Seller account tour

F

FBA

Fulfillment by Amazon: Amazon stores your units in its warehouses and packs and ships each order, for a fee per unit.

Example: a seller who sells a made-up water bottle with FBA sends units to Amazon, and each order ships from an Amazon warehouse.

Where you see it: Supply chain › Manage Amazon inventory › Manage FBA inventory (classic: Inventory › Manage FBA Inventory)

Rule: FBA fulfillment fees and size tiers, effective ; checked . Change log: FBA fulfillment fees and size tiers

Sources:

Lesson: Seller account tour

FNSKU

An ID in Amazon's inventory reports, next to ASIN and MSKU. The low-inventory-level fee is counted per seller FNSKU.

Example: in the Inventory Ledger, a made-up water bottle shows the FNSKU XSIM000001 next to its ASIN and MSKU.

Where you see it: Supply chain › Manage Amazon inventory › Manage FBA inventory (classic: Inventory › Manage FBA Inventory); Supply chain › Supply chain reports › FBA inventory reports (classic: Reports › Fulfillment)

Rule: Low-inventory-level fee per FNSKU, effective ; checked . Change log: Low-inventory-level fee per FNSKU

Sources:

  • Amazon help page GV43F6S76Y9DHYRH (opens a real Amazon page), checked
  • Report column names read by L-Guard Refund Recovery (Inventory Ledger: FNSKU, ASIN, MSKU; reimbursements and returns: sku, fnsku, asin), checked

Lesson: ASIN, SKU and FNSKU

G

GTIN

Global Trade Item Number: a unique number used across supply chains to identify a product or service.

Example: a water-bottle model has a GTIN that retailers use to identify it when ordering or invoicing.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Sources:

Lesson: ASIN, SKU and FNSKU

H

Holiday peak fee

An extra FBA fulfillment fee per unit for units that ship from Oct 15, 2026 to Jan 14, 2027.

Example: a seller pays a higher FBA fee on a made-up water bottle for units that ship in the holiday window than for units that ship before it.

Where you see it: Finance › Manage payments (classic: Payments › Payments Dashboard)

Rule: Holiday peak fulfillment fee, effective ; checked . Change log: Holiday peak fulfillment fee

Sources:

Lesson: Seller account tour

I

Inventory Ledger

Amazon's report of your units' movements in its warehouses, including units lost, found or damaged; it replaced the Inventory Adjustments report.

Example: a seller’s ledger shows a made-up water bottle (MSKU HL-WB32-SLV, FNSKU XSIM000001) with one unit lost, then found.

Where you see it: Supply chain › Supply chain reports › FBA inventory reports (classic: Reports › Fulfillment)

Rule: Inventory Ledger replaced the Inventory Adjustments report, checked . Change log: Inventory Ledger replaced the Inventory Adjustments report

Sources:

Lesson: ASIN, SKU and FNSKU

Item Highlights

A field of up to 125 characters, shown under the product name since Aug 10, 2026; only for titles of 75 characters or fewer.

Example: a USB-C charging cable whose title fits the limit can add Item Highlights such as “Braided nylon, works with most phones and tablets”.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Rule: Item Highlights field, effective ; checked . Change log: Item Highlights field

Sources:

Lesson: Product title rules

L

Low-inventory-level fee

An extra FBA fee per unit when both your 30-day and 90-day supply are under 28 days; counted per FNSKU.

Example: when a water bottle’s stock at Amazon runs low on both measures, each unit shipped carries this extra fee until either measure is back at 28 days or more.

Where you see it: Supply chain › Manage Amazon inventory › Manage FBA inventory (classic: Inventory › Manage FBA Inventory)

Rule: Low-inventory-level fee per FNSKU, effective ; checked . Change log: Low-inventory-level fee per FNSKU

Sources:

Lesson: ASIN, SKU and FNSKU

M

Media category

Amazon's Media categories, such as books, music, video and DVD, and software. The 75-character title limit does not apply to them.

Example: a cookbook is in a Media category; a set of kitchen tools is not.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Rule: Title length limit, effective ; checked . Change log: Title length limit

Sources:

Lesson: Product title rules

MSKU

Merchant SKU: the name of the SKU column in the Inventory Ledger. The reimbursements and returns reports call the same column sku.

Example: a made-up water bottle appears in the Inventory Ledger with MSKU HL-WB32-SLV.

Where you see it: Supply chain › Supply chain reports › FBA inventory reports (classic: Reports › Fulfillment)

Sources:

  • Report column names read by L-Guard Refund Recovery (Inventory Ledger: FNSKU, ASIN, MSKU; reimbursements and returns: sku, fnsku, asin), checked

Lesson: ASIN, SKU and FNSKU

O

Order Defect Rate

The share of seller-fulfilled orders that had a problem, as Amazon counts them. Amazon's target is under 1% over 60 days.

Example: a seller with no defective seller-fulfilled orders in the period has an Order Defect Rate of zero. The current target does not apply to FBA orders.

Where you see it: Account health (classic: Performance)

Rule: Account health targets, checked .

Sources:

Lesson: Seller account tour

P

Parent and child ASIN

Child ASINs identify variations such as colors or sizes; the parent groups related variations.

Example: a fictional bottle comes in silver and black, with a child ASIN for each color.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Sources:

Lesson: ASIN, SKU and FNSKU

Payout

Money Amazon sends from your available balance to your bank account, on its settlement cycle or when you request it.

Example: once a water bottle order’s held money becomes available, it goes into the seller’s next payout.

Where you see it: Finance › Manage payments (classic: Payments › Payments Dashboard)

Rule: DD+7 payouts, effective ; checked . Change log: DD+7 payouts

Sources:

Lesson: Seller account tour

Plain cut

L-Guard's cut of an over-limit title at the last whole word within 75 characters. Not what Amazon does.

Example: a long kitchen container title is cut after its last whole word that fits, and a dangling “with” at the end is dropped.

Where you see it: L-Guard Listing Studio, when it shortens a title in code

Rule: Title length limit, effective . Change log: Title length limit

Sources:

  • L-Guard rules record, checked
  • L-Guard listing rules code (dated copy, version of Oct 22, 2026), checked

Lesson: Product title rules

Prep services

Amazon's paid service that prepared and labeled units in its warehouses. It ended for US FBA shipments on Jan 1, 2026.

Example: a seller’s water bottles arrive at Amazon already bagged and labeled by the seller; units that arrive without proper prep are not eligible for reimbursement if damaged or lost.

Rule: End of US prep services, effective ; checked .

Sources:

Lesson: ASIN, SKU and FNSKU

Promotional phrase

Deal wording: Free Shipping is prohibited in titles; subjective Best Seller wording falls under guidance. Older checker warnings may differ from current policy.

Example: remove “Free Shipping” from a product title even if an older checker shows only a warning (current Amazon Help).

Where you see it: L-Guard listing limits checker

Sources:

Lesson: Product title rules

R

Removal order

A request to Amazon to send units back to you or dispose of them, so they stop counting toward storage and aged-inventory fees.

Example: a removal order for old kitchen stock, submitted by 11:59 pm PT on the 14th, avoids that month’s aged-inventory charge.

Where you see it: Supply chain › Manage Amazon inventory › Manage FBA inventory (classic: Inventory › Manage FBA Inventory)

Rule: Aged-inventory monthly count, checked .

Sources:

S

Search Terms

Hidden keywords that help search find your product, up to 249 bytes. Buyers do not see them; some letters take several bytes.

Example: for a USB-C cable, Search Terms might hold words shoppers use that are not in the title, such as “charger cord”.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Rule: Search Terms byte limit, checked .

Sources:

Lesson: ASIN, SKU and FNSKU

Seller account

The back office where a seller runs their store: listings, stock, orders and money in workspaces, with account health in the top bar.

Example: in a seller account, a water bottle’s listing, its stock and its orders each sit in their own workspace.

Where you see it: My business (the home page) (classic: Home)

Sources:

Lesson: Seller account tour

Settlement report

A report of the sales, fees and refunds behind one payout. Legacy XML and flat-file formats end Nov 11, 2026; a newer flat-file format stays.

Example: the settlement report for one payout lists each sale of a made-up water bottle, its fees and any refund.

Where you see it: Finance › Finance reports › Payment reports (classic: Reports › Payments · Date Range Reports)

Rule: Old settlement report formats removed, effective ; checked . Change log: Old settlement report formats removed

Sources:

Site map

One page that lists the seller account's tools in groups, mostly by workspace, linked from the menu and from the page footer.

Example: to find where Manage FBA Inventory went, open the site map and look under Supply chain.

Where you see it: Menu › Site map (also in the page footer)

Sources:

Lesson: Seller account tour

SKU

A code for a product in your inventory records. You may choose it, or Amazon can assign one.

Example: the fictional SKU HL-WB32-SLV identifies the silver water bottle in the seller's records.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Sources:

Lesson: ASIN, SKU and FNSKU

T

Title

The product name at the top of a product page: at most 75 characters, spaces included, outside Media categories.

Example: “Hearthline Bamboo Cutting Board Set, Three Sizes” fits the limit.

Where you see it: Products › Manage products (classic: Inventory › Manage All Inventory)

Rule: Title length limit, effective ; checked . Change log: Title length limit

Sources:

Lesson: Product title rules

W

Workspace

A group of related pages, such as Finance or Supply chain. Workspaces replaced the classic top menus.

Example: a water bottle’s stock is in the Supply chain workspace; its orders are in Orders.

Where you see it: My business (the home page) (classic: Home)

Screen names as of Oct 2026.

Sources:

Lesson: Seller account tour

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