Vendor Central to Seller Central: A 90-Day Operations Plan for 1P Brands Moving to FBA

By Bernardo Campelo, Forbes Business Council E-Commerce Leader, Amazon SPN Certified provider, Amazon SP-API authorized partner, and Founder of PrepVia.

As of October 29, 2026, Amazon describes the two account types in one short paragraph on its Seller Central page: "Vendor Central is by invitation only from Amazon. It's a first-party vendor relationship. Instead of selling directly to customers, vendors sell in bulk (wholesale) to Amazon." In Seller Central the brand is the seller, and the inventory never stops being the brand's until a customer buys it.

That is why a move from 1P to 3P is an operations project before it is a marketing one. Amazon's Business Solutions Agreement has the seller represent that "you have valid legal title to all Units" it sends to Fulfillment by Amazon, and that it will "be responsible for all costs incurred to ship the Units to the shipping destination." Storage, labeling, inbound mistakes and the wait for cash all land on the brand's books.

This guide is a 90-day plan for a manufacturer or importer moving from Vendor Central to its own Seller Central account with FBA, written for the ecommerce, operations and finance leads who will each own a part of it.

Every date and name below was checked on October 29, 2026 against Amazon's Seller Central help pages, the Business Solutions Agreement, Amazon's Brand Registry site and an Amazon moderator answer in the Seller Forums, linked where they first appear. Amazon edits these pages without dating them, so check the linked page before you act on a rule.

What Changes Hands When a Vendor Becomes a Seller

In the vendor model, Amazon is the customer: it issues the purchase order and buys the goods. In the seller model, Amazon is a marketplace and, with FBA, a warehouse for the brand's own inventory. The table keeps to what Amazon publishes; where a vendor agreement decides, it says so.

The last row matters most in the first week. What happens to purchase orders already issued, and to inventory Amazon already owns, is not something a seller account controls or a help page answers. Your vendor agreement decides. Confirm both with your vendor manager or in Vendor Central before you forecast 3P volume.

"When a vendor becomes a seller, the first thing that changes is who carries the inventory risk. Amazon no longer buys the units, so every unit that sits unsold, arrives without the right label or waits on a reimbursement claim is the brand's cost until it sells or Amazon reimburses it."

Bernardo Campelo, Founder of PrepVia

Risk does not mean every loss is yours. Amazon's FBA inventory reimbursement policy says that if an item "is lost or damaged at a facility or by a carrier operated by Amazon or on behalf of Amazon, we replace that item with a new item of the same product or reimburse you for it." The page lists conditions, among them "The item is registered in FBA at the time it is lost or damaged" and "You have sent us the exact items and quantities stated in your shipping plan." A clean inbound is one of the conditions that keeps a lost unit Amazon's problem. The claim still has to be filed, and a unit lost in inbound or in fulfillment center operations before fulfillment is reimbursed at its "sourcing cost," which "excludes costs such as shipping, handling, customs duties, or other costs."

Days 1 to 30: Accounts, Brand Registry and the Right Entity

Use one login across the accounts

Amazon's Brand Registry page is direct about it: "If you have a Seller Central or Vendor Central account, use the same username and password to create your Brand Registry account." The Seller Central page says the same, to "sync access."

Enroll from the entity that owns the trademark

Brand Registry follows the trademark owner. Amazon's requirements say "You must be the trademark owner. If you are an authorized agent, have the trademark owner enroll the brand, then add you as an additional Brand Registry account user." The trademark has to be "an active, registered trademark or a pending trademark application" from the trademark office of a country with an Amazon store, and the trademark text must match the brand name on the application.

If the trademark sits in a parent company and Seller Central in a subsidiary, the entity that owns the trademark has to enroll the brand and assign the roles. Sort that out with your trademark counsel before the first listing.

Recover the Administrator if it left with the vendor team

If the brand's Brand Registry Administrator left with the vendor team, Amazon's FAQ lists two routes. With access to another enrolled brand, submit a request through Brand Registry Support and "Select Update brand ownership as the topic." Otherwise, start an enrollment with the same trademark number, open the Share Contact Information form and, if your account is eligible, use the appeal link at the bottom; "If your appeal succeeds, you'll be added to the brand with the Administrator and Rights Owner roles."

Register the products, then check the role

This is the step teams skip. Amazon's page on using manufacturer barcodes for FBA says: "Enrolling your brand in Brand Registry doesn't automatically connect your products to your brand. To use manufacturer barcodes, you must register your products to your brand."

Then confirm the seller account's role. Amazon's FBA barcode choice and labeling FAQ says the seller must be "enrolled in Amazon Brand Registry as a brand representative for the brands you are selling," and points to the Brand Relationships page in Seller Central to verify selling roles.

Listings: Who Controls the Detail Page After 1P

A former vendor arrives in Seller Central with ASINs that already have titles, images and a List Price. The brand's new edits compete with what is there, and Amazon publishes how it picks the value it shows.

The rules Amazon publishes

• The system picks. Amazon's page on suggesting changes to a detail page says that when contributions "do not show on the product detail page, it means Amazon's system has selected another contributor's information that best describes the product."
• On a brand-registered ASIN, the Brand Representative wins over resellers. The same page: "the contribution from the seller with a Brand Representative role is displayed in the product detail page."
• Between authorized users of the brand, performance can decide. Amazon's product detail page rules say the system "may choose which information should be displayed based on the contributing parties' sales volume, refund rate, buyer feedback, and A-to-z claims."
• Support will not edit it for you. "Contributions made by an authorized user to a Brand Registry branded ASIN can't be edited by the Selling Partner Support team." Amazon points to Account Health, Report Abuse, for incorrect information.
• Register first. Amazon tells sellers with a brand role to "register products to your brand before suggesting changes to your product detail page."

Amazon's pages do not say how contributions made through a vendor account rank against a seller's, so do not plan around a rule Amazon has not published. The practical sequence follows from what Amazon does publish: register the products to the brand, confirm the Brand Representative role, submit the change, wait the 48 hours Amazon gives for a verified contribution to show, and only then escalate.

The product ID does not move

The detail page rules also say: "Unless your listing was created with a GTIN exemption, you cannot edit or update the product ID of an existing listing." A brand that wants to fix a UPC on an old 1P ASIN cannot do it by editing.

List Price has to earn its strikethrough

A List Price carried over from the vendor years shows only if it passes Amazon's validation. Amazon's list price page says "The lookback period is 90 days," that on Amazon sales the List Price must match the Featured Offer price "for a meaningful number of days in the last 90 days," and that "Products need at least 9 days of Featured Offer data to qualify." It can also be validated against other retailers' prices, and the reference price policy says "If Amazon cannot verify your List Price, we might not use it." An old MSRP that the Featured Offer has not matched in the last 90 days, and that other retailers do not support, is not a promise.

Days 31 to 60: Manufacturer Barcode or FNSKU, SKU by SKU

A manufacturer usually has GS1 barcodes on its units. In FBA the barcode is a per-SKU decision with rules attached, and the rules changed this year. Amazon's FBA barcode requirements open with it: "As of March 31, 2026, barcode requirements have changed. Brand owners can continue to use manufacturer barcodes without stickers. Resellers are required to use Amazon barcodes for products even if they have a manufacturer barcode."

To track a product by its manufacturer barcode, Amazon lists three conditions. The product must "Be in new condition," "Have a single, scannable UPC, EAN, or ISBN barcode matching a single ASIN in the Amazon catalog," and "Be associated with a brand enrolled under Amazon Brand Registry where the seller is a brand representative."

Two details catch former vendors. First, the vendor catalog attribute is not a receiving barcode. Amazon calls "Vendor_barcode" "An internal catalog attribute that isn't used for fulfillment center receiving or product matching." Second, the barcode preference takes "about 24 hours" and applies "only to new offers." Existing offers keep their setting until you change it offer by offer, and created shipments cannot change. Set the preference before you create your FBA offers, and check each offer's setting before the first shipment.

Choosing the manufacturer barcode is not free of risk either. Amazon's page warns: "If a product requiring an Amazon barcode arrives without one, we'll mark it as defective and apply a barcode sticker ourselves." A SKU that fails one of the three conditions and ships without FNSKU labels arrives as a defective unit that Amazon has to sticker itself, the defect shows on your Inbound Performance Dashboard, and Amazon's labeling FAQ says units that are not properly labeled are not eligible for reimbursement. Our guide to manufacturer barcode eligibility covers the March 31 change in detail.

The First Inbound: Box Content, Placement and Send to Amazon

A vendor shipment followed Amazon's purchase order. A seller shipment follows a shipping plan the brand builds itself, in Send to Amazon or through the Selling Partner API. Three decisions in that plan have a direct cost.

Box content for every carton

Amazon's box content page says "Amazon requires accurate box content information for each box sent to a fulfillment center," and "If you do not provide box content information, Fulfillment by Amazon (FBA) will assess a fee to manually process the contents of each box." Mixed-SKU shipments of "a total of 15 boxes or fewer, and a total of 25 SKUs or fewer" can use the web form, a file or 2D barcodes; above that, only a file or 2D barcodes. For single-SKU boxes, Send to Amazon lets you "Create reusable case pack templates" with box content, weight, dimensions and prep details, so the carton is defined once per SKU. Our walkthrough of adding box content to an FBA shipment goes through each method.

Placement: fee or five identical cartons

Amazon's inbound placement service fee page lists the options. "Minimal shipment splits" send inventory to the fewest inbound locations "for a fee." "Amazon-optimized shipment splits" send it to several locations "for no fee," and "To qualify, shipments must include at least five identical cartons or pallets per item. Each carton or pallet must contain the same quantity per item and the same item mix." Partial splits are for bulky items only. Amazon dates its current fee changes "effective January 15, 2026." Our placement fee guide has the current schedule.

Days 61 to 90: Cash, From a Vendor Invoice to a DD+7 Settlement

This is the section for the CFO. As a vendor, the brand invoiced Amazon and was paid on the terms of its vendor agreement. As a seller, there is no invoice. Cash comes from customer orders, after delivery, net of fees.

The reserve

Amazon's page on payments based on delivery date says: "Funds are reserved until a shipment is delivered, plus a reserve period. The standard reserve period is 7 days after delivery date ("DD + 7" reserve policy). For example, if you sell something on January 1, and it is delivered on January 6, then under the DD + 7 policy, your funds will become available for disbursement starting on January 14." It adds that "Your reserve period may be extended following an assessment of your overall risk and historical performance."

An Amazon moderator answered sellers in the Seller Forums on February 25, 2026: "DD+7 is becoming the standard for all sellers in Amazon's store." The same answer points to Disburse on Demand, which lets a seller request its available funds "once every 24 hours." Amazon's page adds that delivery date reserves still "process normally," so it does not release funds still in reserve.

The first month looks worse than it is

The line a finance team should read twice: "If you recently had a delivery date reserve policy applied to your account, or if you have just started selling, it is normal for all of your funds to be held in reserve." Those transactions "appear on your Payments Dashboard as Deferred transactions." A brand that stops vendor invoicing and starts selling in the same month will see revenue on the dashboard and very little cash in the bank for the first weeks.

The Business Solutions Agreement sets the outer frame: Amazon will "remit to you your available balance on a bi-weekly (14 day) (or at our option, more frequent) basis," and may establish a reserve based on its assessment of risk and modify the amount "at our sole discretion."

What to model

• Costs start before sales. Inbound freight and storage are the seller's from the first shipment. Amazon's storage fee page says fees "are calculated on your daily average volume in cubic feet."
• Two cash streams overlap for a while. Any vendor receivables still due under the old terms run alongside the new settlements. Keep them in separate lines in the forecast.
• Close the month on accruals. Our post on accruing Amazon fees at month end covers the close.

Take the accounting treatment of the switch to your accountant.

The 90-Day Plan on One Page

The order matters more than the exact days: the barcode depends on the brand role, the brand role on the right entity, and the first inbound on the barcode.

Where a Prep Center Fits

A prep center works on the physical side of the seller account. It receives the brand's inventory, counts it, applies FNSKU labels where the SKU needs them, builds the cartons and pallets to the box content the shipping plan declares, and creates the inbound shipment.

• What it handles. Receiving, inspection, counting, labeling, bagging, box packing, pallet building and inbound shipment creation; FNSKU, barcode and suffocation-warning labels; case packs for the shipping plan.
• What stays with the brand. The vendor agreement and open POs, Brand Registry enrollment and roles, detail page content and List Price, the barcode preference in Seller Central, and the cash plan.
• What to ask. Does the prep center create the inbound plan, placement options and box content through the Selling Partner API, or does your team re-key them? How does it report a count that does not match the packing list?

PrepVia preps for Amazon FBA from its warehouse at 8507 NW 72nd St, Miami, FL 33166. Inbound shipments are created through Amazon's SP-API, including the inbound plan, placement options, box content, partnered freight booking and receiving status. Receiving and inspection are included, and discrepancies are reported within 24 hours of arrival, with photos. EDI and ASN transactions are not offered.

Frequently Asked Questions

What is the difference between Vendor Central and Seller Central?

Amazon says Vendor Central "is by invitation only" and that vendors "sell in bulk (wholesale) to Amazon." In Seller Central the brand sells to customers itself. With FBA, the seller holds title to the units in Amazon's fulfillment centers and pays the inbound freight and storage.

Can I use my Vendor Central login for Seller Central and Brand Registry?

Amazon recommends it. Its Brand Registry FAQ and its Seller Central page both say to use the same username and password as your Vendor Central account to sync access.

What happens to my open purchase orders when I move to Seller Central?

Your vendor agreement decides. Amazon does not publish a seller-side rule for open POs or for inventory it already bought as a vendor. Confirm both with your vendor manager or in Vendor Central before you plan 3P volume.

Can a former vendor ship to FBA with its own UPC barcodes?

Yes, if each SKU qualifies. The product must be new, carry one scannable UPC, EAN or ISBN matching one ASIN, and belong to a brand in Brand Registry where the seller is a Brand Representative, with the products registered to the brand. Since March 31, 2026, resellers can no longer skip the sticker. Products with a GTIN exemption need Amazon barcodes.

Why don't my edits show on my old 1P listings?

Amazon's system picks the contribution it displays. On a brand-registered ASIN, the Brand Representative's contribution is shown over a reseller's, and Amazon asks brand-role sellers to register products to the brand before suggesting changes. If a verified change does not appear within 48 hours, the system chose another contributor's data.

How long does Amazon hold a new seller's money?

The standard reserve is seven days after delivery (DD+7), and Amazon says it can be extended based on risk and performance. For a new seller, Amazon says it is normal for all funds to be held in reserve at first. Available balances are remitted on a 14-day basis or more often under the Business Solutions Agreement.

Final Take

Leaving the vendor model moves three things to the brand at once: the inventory, the listings and the timing of cash. Each has a published Amazon rule, and they depend on each other.

Run the 90 days in that order. Settle the vendor agreement questions first, get the Brand Registry identity right, decide the barcode per SKU, ship clean cartons with box content, and fund the first weeks of reserve before they arrive.