Multichannel
eBay inventory management
eBay sells whatever quantity a listing shows. Selling an item it no longer has counts against the seller, which is why eBay offers to keep a listing live and hidden at zero rather than end it.
On eBay the stock is yours, the same stock Shopify is selling. Every unit is offered in two places at once, and the listing quantity is a promise made on behalf of the warehouse.
At zero quantity
Listing stays live, hidden
With the out-of-stock option on, a listing at 0 stays active but hidden from search, and reappears when the quantity goes up.
SourceWhere it is set
Selling preferences
eBay: the toggle is "Listings stay active when you're out of stock", under Multi-quantity listings.
SourceSeller standards
Transaction defects
eBay says the option "may help protect you from receiving a transaction defect for running out of stock."
SourceRead from eBay's own seller pages on 23 September 2026. Marketplaces change their rules without notice, so check the current page before these inform a decision.
Three ways to run eBay stock beside Shopify
Each is right for a particular operation. Listings, locations and order volume decide when you move from one to the next.
01
By hand in eBay's own tools
Fits when
A few listings, one location, and someone who adjusts quantities as orders arrive.
Who owns what
eBay and Shopify each hold their own count, and a person keeps them level.
02
A listing tool that pushes quantities
Fits when
Enough listings that hand edits fall behind, with stock still in one place.
Who owns what
One stock figure is pushed out to Shopify and eBay, so a sale on one channel reduces the other.
03
A stock system that owns the truth
Fits when
Several channels, more than one location, or stock split between your shelves and a 3PL.
Who owns what
The stock system says what exists and where. eBay and Shopify are told what they may sell, and orders flow back to be allocated.
How the stock systems in this market compare is on stock control software, and how orders from every channel get allocated is on order management systems.
The number eBay should be sent
Stock is four numbers. A marketplace receives one of them, and it has to be the right one.
On hand
What sits physically on the shelf. Never the figure to send a marketplace.
Committed
Units already sold on any channel and not yet shipped. They leave the channel's figure the moment the order lands.
Available
On hand less committed, less any buffer held back for the channel. This is the figure the marketplace receives.
Incoming
Stock on order. Offered only where the marketplace allows a later dispatch date, and said so on the listing.
The same question for the other marketplace
Amazon inventory management
Amazon offers two places for stock to live: its own fulfilment centres under FBA, or your warehouse under Fulfilled by Merchant. With Multi-Channel Fulfilment, FBA stock can also fill orders from other channels, Shopify included.
Shopify and eBay on one stock figure
Tell us how many listings you run on eBay, where the stock sits and what keeps the counts level today. We'll reply with the setup that fits and what it takes to get there.