Moving from Amazon 1P to 3P: the operations checklist for vendor brands

This guide is for US brands moving from selling to Amazon as a vendor to selling on Amazon themselves, whether Amazon stopped buying or you chose to go. It covers what changes, a day-one checklist with an owner and an automation option for every line, and the choice between your own seller account, a reseller and a 1P accelerator. Amazon and Pattern facts come from their own pages and filings, and the vendor-termination history from the outlets that reported it. Each source is linked where it is used and was checked on September 25, 2026.

What is the difference between Vendor Central and Seller Central?

Vendor Central is the portal for first-party (1P) suppliers: you sell to Amazon, and Amazon sells to the shopper. Amazon's Seller Central page (checked September 25, 2026) says Vendor Central is by invitation only, and that vendors sell in bulk, wholesale, to Amazon, which then distributes the product. Seller Central is the third-party (3P) side, open to businesses that register and pass Amazon's verification. You sell to the shopper directly, on the same product detail pages, and pay Amazon fees. In 3P you become the seller of record, the business named in the Sold by line, with the stock, the price and the customer questions that come with it.

Why are brands moving from 1P to 3P?

Some brands choose to move. Others are told to, and Amazon has cut vendor relationships more than once. In March 2019 it stopped filling weekly purchase orders from tens of thousands of vendors, then walked most of that back within a week, as Modern Retail reported (checked September 25, 2026). Its follow-up email gave vendors 60 days to enroll in Brand Registry to keep automatic purchase orders, and pointed vendors that were not brand owners to Seller Central.

In October 2024, Retail Brew reported (checked September 25, 2026) notices telling vendors that Amazon would stop sourcing their products, one of them effective November 9, 2024. An Amazon spokesperson told the outlet the company regularly reviews its product offerings. A 1P advisor it quoted said Amazon seemed to be targeting brands with less than $1 million to $5 million a year in Vendor Central sales, and that some brands got two to three months' notice.

The notices kept coming. In June 2026 the Amazon consultancy Goat Consulting published the text of a notice (checked September 25, 2026) that it says vendors in the latest round received. It ends the vendor relationship on August 2, 2026, says Amazon will not sign new agreements or extend current ones past that date, and invites the vendor to list its items as an independent seller. Amazon has not published a list of these rounds, so work from the date in your own notice. If yours said August 2, Amazon has already stopped buying, but it may still be selling the units it bought from you.

Brands that move by choice want what 1P never gave them: the retail price, the retail margin and a direct view of shopper demand. In exchange you fund the inventory, pay the fulfillment fees and staff the pricing, stock and customer work that Amazon's retail team used to do. Whether that pays depends on contribution margin per SKU, not on the top line, which is why the checklist below starts with pricing.

What happens when Amazon stops buying from you?

New purchase orders stop by the termination date, but your products do not disappear. Detail pages, ASINs and reviews stay in Amazon's catalog, and Amazon's guide to product listings (checked September 25, 2026) explains that a seller can match an offer to an existing detail page instead of creating a new listing, though some brands and categories need approval first. Amazon still owns the units it bought from you and can keep selling them at its own price. When that stock runs out and no seller offer is ready, the page has nothing to sell, and your rank and reviews sit idle.

The risk window is the gap between Amazon's last unit and your first FBA unit that is received and available, so plan your first shipment against Amazon's remaining stock, not the termination date. You can estimate it while you still have Vendor Central access. Amazon's Selling Partner API documentation (checked September 25, 2026) lists vendor-only Retail Analytics reports, including an inventory report with Amazon's sellable on-hand units per ASIN and a sales report with shipped units by day or week. Divide on-hand units by average daily shipped units for a rough count of the days Amazon's stock will last, then subtract your receiving time.

While Amazon sells through, its offer and yours share the page, and the Featured Offer (Buy Box) goes to one of them. Undercutting Amazon's price to win it mostly moves margin from you to the shopper, and Amazon has already paid you for those units. Price for the long run, let Amazon's stock run down, and make sure your FBA units are received before the last of it sells.

What changes in pricing, margin and control?

Price becomes your job. Amazon's Marketplace Fair Pricing Policy (checked September 25, 2026) lets Amazon remove the Featured Offer, remove the offer or, in serious or repeated cases, suspend selling privileges when a price is significantly higher than recent prices offered on or off Amazon. Those recent prices can include what Amazon itself charged for your product as the retailer, so set your opening price close to what shoppers last paid and move it in steps. If you run a minimum advertised price policy with other retailers, hold your own Amazon offer to it as well, or your retail partners will see the brand undercutting them.

Margin changes shape. In 1P your margin is the wholesale price, less invoice deductions, less landed cost. In 3P it is the retail price less every Amazon fee, prep, your ad spend and returns. Compare the two per SKU, with the same landed cost in both, before you commit volume to 3P:

1P margin per unit = wholesale price − invoice deductions (chargebacks, shortages, allowances) − freight to Amazon, if you pay it − landed cost

3P contribution per unit = your price − referral fee − FBA fulfillment fee − storage and inbound placement fees per unit − inbound freight to FBA per unit − prep and labeling per unit − ad spend per unit − returns cost per unit − landed cost

Pull referral and FBA fees for your SKUs from the Revenue Calculator on Amazon's pricing page, and use your vendor-era ad cost per unit as a first guess. SKUs that lose money at 3P fees are candidates to ship yourself, bundle, reprice or drop. Do not build new-seller incentives into the model yet: Amazon's FBA page (checked September 25, 2026) enrolls new sellers in its FBA New Selection program when they bring new eligible products to FBA, and does not say whether a former vendor's ASINs count as new. Our contribution margin entry has the full calculation.

Control is the part brands want. Amazon Brand Registry (checked September 25, 2026) is free and needs a pending or registered trademark plus a logo with your brand name on the product or its packaging. It gives brand owners enhanced detail-page content and protection tools. If you are not enrolled yet, Amazon says to create the Brand Registry account with the same username and password as your Seller Central or Vendor Central account. Once a brand is enrolled, Amazon's listing guide says only sellers associated with it can create or suggest updates to its detail pages through the standard listing processes, and a new detail page needs a Brand Representative or an authorized reseller.

Brand Registry now matters for logistics too. For FBA inventory shipped on or after March 31, 2026, Amazon's commingling announcement (December 8, 2025, checked September 25, 2026) says brand owners with the Brand Representative selling role no longer need Amazon barcode stickers on products that already carry a manufacturer barcode such as a UPC. Resellers without that role must use Amazon barcode stickers, and products with no manufacturer barcode need them either way. Get the role onto your seller account before the first shipment, or plan to sticker every unit.

The day-one 3P operations checklist

This is the checklist we would set up with a vendor brand for its first day as a 3P seller. Every line has an owner, the person on your team who answers for it, and an automation option. "Rule" means a fixed check that runs on a schedule. "Model" means a step that uses a forecasting or language model. Purchase orders, prices outside the approved band, budget changes above a set limit, claims and every customer reply stay with a person.

Five lines need more detail than a table row can hold.

Prep. Since January 1, 2026, Amazon no longer offers FBA prep and item labeling in the US (checked September 25, 2026), including for stock routed through AWD, Amazon Global Logistics, SEND and Supply Chain Portal. Any unit that needs prep or an Amazon barcode must arrive with it, whether your prep center, your 3PL or your own warehouse does the work. That is why the 3P formula above carries its own prep and labeling line, priced per unit from your prep center's rate card or your warehouse labor.

Capacity. Amazon's January 2023 announcement of its capacity system (checked September 25, 2026) sets limits monthly in cubic feet, counts stock on hand plus shipments created but not yet arrived, and weighs factors such as your IPI score and sales forecasts. Sellers ask for more through Capacity Manager by naming a reservation fee, and Amazon's Holiday 2026 post (July 7, 2026, checked September 25, 2026) still points sellers there. A new seller account has no FBA sales history of its own, so check its limit in Seller Central before you book freight. Our replenishment guide covers reorder points across FBA, AWD and a 3PL.

Customer service. Amazon's FBA page says it handles customer service and returns for FBA orders, yet questions still reach you. An Amazon staff post in the Seller Forums (March 16, 2026, checked September 25, 2026) says all customer questions, pre-purchase ones included, have routed to the Buyer-Seller Messaging inbox since early 2025. It adds that a customer who contacts you about an order issue and gets no reply within 48 hours can file an A-to-z Guarantee claim, while a reply after 24 hours does not count against your account health metrics. Treat 24 hours as the target that protects sales and 48 hours as the line you never cross.

Reimbursements. Under the policy Amazon announced in December 2024 (checked September 25, 2026), units lost or damaged before a customer order are reimbursed at manufacturing cost: your cost to make or source the product, excluding shipping, handling and customs duties. If you do not enter your own costs, Amazon applies an estimate based on comparable products. A vendor brand already knows these costs from its own invoices, so enter them before the first shipment lands, and keep landed cost separately for the margin model above.

Ads and data. Amazon Ads says a product must be eligible for the Featured Offer to run Sponsored Products. A new seller account no longer has to clear a separate seller eligibility bar for that: as of September 2026, Amazon's help page Becoming the Featured Offer says offers from all sellers are evaluated, though an offer that is out of stock or not price-competitive still is not featured. See the Buy Box entry for the levers. Sponsored Brands is open to professional sellers enrolled in Brand Registry. Amazon lists its Vendor Retail Procurement Orders API as vendors only, while the Selling Partner API gives sellers their own data on orders, shipments, payments and inventory (all checked September 25, 2026). Any feed built on vendor data needs a seller-side replacement. Save the vendor history first: Amazon's documentation says its vendor forecasting report returns only the most recent weekly demand forecast, and past forecasts cannot be requested, so export it along with sales and inventory before access ends.

What should you automate from the start?

Automate the checks that fail quietly and cost money every day: price guardrails, Featured Offer alerts, reorder points and shipment drafts, ad budgets paced by stock, shipment reconciliation and a daily margin per SKU. Nearly all of them are rules, fixed checks that run on a schedule, and that is a strength: rules are easy to audit, and your team can see exactly why an alert fired. Start with the reorder point and the price band, because those two decide whether the page stays in stock and keeps the Featured Offer in the first month.

Two steps earn a model. Demand forecasting comes first, because a vendor's history is messy: purchase orders reflect Amazon's buying pattern, not shopper demand. Forecast from shopper sales, starting with the ordered units in your exported vendor sales report, let the model handle promotions and seasonality, and let a reorder rule turn the forecast into a draft purchase order. Drafting replies to buyer messages is the second, with a person sending each one. Our pages on the inventory and replenishment agent and the advertising agent we build show where rule steps end and model steps begin.

Keep a person on purchase orders, budget changes above a set limit, claims, prices outside the approved band and every customer reply. Inventory-aware ad spend covers pausing ads before a stockout, and the FBA reimbursements guide lists each claim window and the evidence Amazon asks for, which is why reconciliation starts on day one, not in a quarterly audit.

Your own account, a reseller or a 1P accelerator?

Three routes keep your products on Amazon, though only two of them work once Amazon has stopped buying. They differ in who is the seller, who sets the price, who funds the stock and how you get paid. Use the table to rule routes out before you talk to anyone who sells one, including us.

Pattern's 3P Accelerator (checked September 25, 2026) buys inventory upfront: on day one it orders what it expects to sell in the first few months, keeps buying as it sells, and handles forecasting, content, listing optimization, ad strategy and customer service. Its Form 10-K for fiscal 2025 (checked September 25, 2026) describes brands selling their products to Pattern at predetermined prices. Pattern's 1P Accelerator (checked September 25, 2026), which Pattern's site now also calls 1P Partnership, works differently: the brand keeps selling wholesale to Amazon, Pattern's 3P page describes it as for brands already selling 1P on Amazon US, and the same 10-K says Pattern does not purchase inventory there and brands pay platform and service fees.

A reseller is the better choice if you do not want to fund FBA inventory or build a marketplace team: you trade the retail margin for a simpler wholesale business. A 1P accelerator is the better choice if you still have a vendor relationship worth keeping. Your own account suits brands that want the price, the margin and the data, and can carry the stock. Our comparison of accelerators, aggregators and agencies sets out who keeps what in each model, and Ecomsellertool vs Pattern covers Pattern's two models in detail.

What does a 90-day transition plan look like?

Start the week the notice arrives, not the week of the termination date. Account verification, Brand Registry roles, prep and FBA check-in each take time, and they mostly run in order. If the termination date has already passed, squeeze weeks 1 to 4 into as few days as verification allows: Amazon's remaining stock, not the calendar, sets your deadline, so check each detail page daily for signs that Amazon's own offer is running out.

How can Ecomsellertool help with a 1P to 3P move?

Ecomsellertool helps vendor brands run 3P on their own accounts. We deploy Ecomsellertool Growth OS on your own marketplace and ad accounts and build the pricing guardrails, replenishment, ad pacing, shipment reconciliation and daily reporting from this checklist, with purchase orders, budget changes, claims and customer replies coming back to your team for approval.

We do not buy inventory or sell on your behalf. You stay the seller of record, set your prices and keep the retail revenue. You keep your accounts, your data and the custom code we build; the Growth OS base is licensed to you. Growth OS is the base system for listings, pricing, orders, inventory and replenishment, 3PL operations, advertising, FBA reimbursements and reporting; we build the custom modules and AI agents your operation needs on top.

We have built on Amazon's seller APIs since 2017. For Little Owl, an FBA prep center, we built the software that manages its clients' listings and inbound shipments, generates FNSKUs and keeps a checklist of FBA requirements for each product, the prep work a vendor brand now owns. For Execuseller we built a reimbursement management system that tracks reimbursements for lost and damaged FBA units and overcharged FBA fees, claim type by claim type. The repricer we built for a client is rule-based automation: prices move only within rules the seller sets against the Featured Offer or the lowest price.

Once your seller account is live, start with the free 24-hour diagnostic: connect Amazon with Login with Amazon, no password shared, and the report arrives within 24 hours of connecting, on business days. We only read data; we never change listings, prices, stock or ads. If you are still on Vendor Central with a termination date ahead, schedule a call from the card below and we will walk through your transition plan with you.