An order management system (OMS) is software that tracks every eCommerce order from checkout to delivery and returns, connecting payments, inventory, picking, shipping labels and customer updates in one place. Online stores need one because orders, stock and shipping promises must stay in sync – and in the US, the FTC requires sellers to ship within the time they advertise, or within 30 days if no time is stated.
Key Takeaways
- An order management system tracks each order through its lifecycle: booking, payment, sourcing, picking and packing, shipment, tracking, delivery and returns.
- An OMS is not the same as an inventory management system (stock counts) or a warehouse management system (where stock sits and how the warehouse works); growing stores often run all three together.
- According to the US Census Bureau, e-commerce was 17.1 percent of total US retail sales in the second quarter of 2026, so order volume and customer expectations keep rising.
- Shopify’s admin already records a payment status and a fulfillment status for every order; third-party order management apps extend that.
- Under the FTC Mail, Internet, or Telephone Order Merchandise Rule, US sellers must ship on time, send a delay notice offering cancellation, and refund promptly.
As anyone who has owned or worked for an eCommerce site would attest, maintaining an online business that is so reliant on a lot of external factors can get extremely nerve wracking at times.
Online shopping keeps growing: according to the US Census Bureau, retail e-commerce sales reached an estimated $340.2 billion (seasonally adjusted) in the second quarter of 2026, or 17.1 percent of total US retail sales. Today’s shopper expects the online shopping experience to be effortless and orders to arrive quickly. This can prove to be quite a challenge for most eCommerce sites out there.
This is why today we decided to concentrate on order management systems, often overlooked in the larger scheme of things when it comes to running an eCommerce business, but over time it is one of the systems that most directly decides how fast orders ship and how accurately customers are kept informed.
1] Helping Expedite Your Shipping Process
If you are shipping your orders from a warehouse, then a big chunk of order delays can be caused due to the time taken by workers to figure where each exact item is stored and then pick them up, wrap them and bring them out to the delivery vehicle. An order management system reduces this delay by sending each order straight into the picking queue, usually working alongside a warehouse management system (WMS) that records the precise location of stock in the warehouse.
Even if you are a drop shipper who uses the Shopify platform, having a third party shopify order management can extend the order tracking already built into the Shopify admin – which records a payment status and a fulfillment status for every order – and help you give customers accurate details about where their orders are.
And if you are shipping from a physical location then order management systems can categorise and pull up storage data on any item in an instant and at the same time print out shipping labels and automate a lot of the other related menial tasks so that orders leave the building faster.
2] Have Your Inventory Managed Real Time
As an e-commerce business, storage space is expensive and ordering something twice can block valuable capital as well as storage space for indefinite amounts of time.
At the same time if due to some human error you fail to have enough stock of a popular item, then you might end up with a frustrated customer at best and at worst a cancelled order if the shipping time takes too long.
This is why having an order management system connected to an inventory management system that updates stock levels in real time is important for the smooth running of your e-commerce platform: every confirmed order should reduce the sellable quantity immediately, so the store never sells stock it no longer has.
3] Using Historical Sales Data to Forecast Changes
Having a dedicated order management system lets you access and analyse all your previous order data in the matter of a few clicks. This is vitally important if you are looking to stay ahead of the trends and keep up with stocks of your most purchased items as their demand increases and decreases with seasonal fluctuations.
The ability to have a birds eye view of your sales also helps in making other forecasts like your trajectory for the next year, where you should be investing more money and energy into and if you are sustainable enough on your current scale to go for another round of expansion!
At the end of the day a good order management system is almost like the perfect manager that keeps on top of your business and production all at once and helps you close out sales deals and evaluate all the financial decisions you have made and how they have impacted your e-commerce platform in general.
In fact it is exactly this ability of giving you a birds eye view of your entire business as a whole that makes order management systems invaluable as a software solution for any online business, especially one that sells through its own eCommerce store.
What Is an Order Management System?
An order management system (OMS) is software that tracks orders from the moment they are placed until they are fulfilled, and manages the people, processes and data connected to each order, as IBM describes it. In eCommerce, an OMS typically collects orders from every sales channel, checks payment, reserves stock, decides which location ships each item, sends the order for picking and packing, creates shipping labels, and records returns and refunds.
The term also has a separate meaning in finance, where an order management system handles securities trades. This article covers the retail and eCommerce meaning only.
OMS vs. Inventory Management vs. Warehouse Management
Order management, inventory management and warehouse management overlap, but each answers a different question. Small stores often get all three from one platform; larger operations usually connect separate systems.
| System | Main question it answers | Typical functions |
|---|---|---|
| Order management system (OMS) | Where is this order, and what happens next? | Order capture from all channels, payment status, order routing, fulfillment status, customer notifications, returns |
| Inventory management system (IMS) | How much stock do we have, and when do we reorder? | Stock counts per location, committed vs. available units, purchase orders, reorder points |
| Warehouse management system (WMS) | Where exactly is the item, and how does the warehouse run? | Recording stock arrivals and departures, bin locations, space use, pick lists and task coordination |
The definition of a WMS as a system whose core function is to record the arrival and departure of inventory, including the precise location of stock, follows Wikipedia’s entry on warehouse management systems. For a deeper look at the stock side, see this guide on why inventory management matters.
What Are the Stages of the Order Lifecycle?
The order lifecycle is the sequence of steps an order passes through from enquiry to after-sales. Wikipedia’s entry on order fulfillment lists 14 stages; for a typical online store they group into these steps:
- Order booking and acknowledgment – the customer places the order and receives a confirmation.
- Invoicing and payment – the payment is authorized and captured, and an invoice or receipt is issued.
- Order sourcing – the system decides which warehouse, store or supplier ships each item.
- Order changes – address corrections, item swaps or cancellations are applied before shipping.
- Order processing – the warehouse picks and packs the items.
- Shipment, track and trace – the parcel is handed to the carrier and the customer receives tracking details.
- Delivery and settlement – the goods arrive and payment is finalized.
- Returns – unwanted or faulty items come back and are refunded, exchanged or restocked.
An OMS is the record that ties these steps together, so any staff member can see which stage an order is in without checking several tools. Returns are a lifecycle stage of their own; this guide to handling common reverse logistics issues covers that side in more detail.
Which Order Picking Method Should a Warehouse Use?
Order picking is the warehouse process of collecting items in the specified quantity before shipment to fill customer orders. Faster, more accurate picking is where an OMS and WMS most visibly shorten shipping times. The common methods, as defined in Wikipedia’s entry on order picking, are:
| Picking method | How it works | Best suited to |
|---|---|---|
| Piece (discrete) picking | One picker collects all the items for a single order | Low order volumes, small catalogs |
| Batch picking | One picker collects items for several orders at once along the most efficient route | Many small orders that share popular items |
| Zone picking | Each picker works only in an assigned zone; picks are combined afterwards | Large warehouses with many product types |
| Wave picking | A combination of zone and batch picking: batches pass from picker to picker through separate zones | High-volume operations with scheduled carrier pickups |
| Sorting systems | The picker stays still and an automated system brings products to them | Automated, high-throughput facilities |
| Pick to box | Items go straight into a mailing-ready container, with no repackaging | eCommerce parcels shipped direct to consumers |
The “best suited to” column is a general guide rather than a rule; order volume, catalog size and warehouse layout decide the right method. More ideas are in this guide on making a warehouse more efficient.
How Does Shopify Handle Order Management?
Shopify includes order management in its admin, so a Shopify store does not need a separate OMS to start. According to the Shopify Help Center, every order carries three kinds of status:
- Order status: Open, Archived or Canceled.
- Payment status: including Pending, Authorized, Paid, Partially paid, Refunded, Partially refunded, Voided and Expired.
- Fulfillment status: including Unfulfilled, In progress, On hold, Scheduled, Partially fulfilled and Fulfilled.
Shopify also separates stock into inventory states. Available units can be sold; Committed units are set aside, for example in an unfulfilled order; Unavailable units are held back as damaged, in quality control or as safety stock; and Incoming units are on the way from transfers or purchase orders. On hand equals Committed plus Unavailable plus Available. This is how a confirmed order automatically stops the same unit from being sold twice.
For fulfillment, the Shopify Help Center describes fulfilling orders one at a time, in bulk, or in batches where staff pick, pack and print documents for many orders at once; buying and printing shipping labels from the admin; and using a fulfillment service or app that stores inventory and ships orders on the merchant’s behalf. Stores that sell on several channels, run several warehouses or need complex routing rules are the ones that usually add a dedicated order management app. If you are still choosing a platform, compare Shopify and WooCommerce.
What Shipping Rules Must US Online Sellers Follow?
In the United States, the Federal Trade Commission’s Mail, Internet, or Telephone Order Merchandise Rule sets deadlines that an order management system should help a store meet. According to the FTC’s business guide to the rule:
- Ship on time: sellers must ship within the time clearly stated in their advertising, or within 30 days if no time is stated. If the customer applies for credit to pay for the order, the seller has 50 days.
- Send a delay notice: if the seller cannot ship on time, it must tell the customer before the deadline, give a revised shipping date (or say it does not know one), and offer the choice to wait or cancel for a full and prompt refund.
- Silence rules: for a delay of 30 days or less, a customer who does not respond is treated as agreeing to wait; for a longer or indefinite delay, the order is canceled 30 days after the original deadline unless the customer expressly agrees to wait.
- Refund promptly: refunds are due within 7 working days for most payments, or within one billing cycle when the seller extends the credit.
- What counts as shipping: the goods are shipped when they are physically placed in the possession of the carrier.
An OMS helps by showing which orders are close to their promised ship date, triggering delay emails and recording customer consent or cancellations. This is general information about the rule, not legal advice; sellers outside the US should check their own consumer protection rules.
How Do You Choose an Order Management System?
Choosing an order management system starts with mapping where orders come from and where they ship from. These steps keep the decision concrete:
- List your sales channels – your own store, marketplaces, social shops, wholesale – and confirm the system can import orders from each.
- List your stock locations – home, warehouse, retail store, third-party logistics (3PL) provider, dropshipping supplier – and check the system can route each order to the right one.
- Check inventory sync – stock should update across every channel when an order is placed, canceled or returned.
- Check shipping tools – label printing, carrier rate comparison, packing slips and tracking emails.
- Check returns handling – return authorizations, refunds and restocking.
- Check reporting – order history, sales by product and season, and time from order to shipment, which feed the forecasting described above.
- Compare total cost – pricing models differ (monthly plans, per-order fees, platform add-ons), so check current prices on each vendor’s site before committing.
A wider list of software categories is in this guide to eCommerce tools an online business needs.
Common Order Management Mistakes
- Updating stock by hand across channels, which leads to overselling an item that has already sold out elsewhere.
- Advertising a delivery time the warehouse cannot meet, which in the US also creates obligations under the FTC shipping rule.
- Treating returns as an afterthought, so returned items are not restocked and the available quantity stays wrong.
- Keeping order data in separate tools, so customer service cannot see payment and fulfillment status in one place.
- Ignoring order history, when past orders are the most reliable input for seasonal stock planning.
Frequently Asked Questions
What does an order management system do?
An order management system tracks each order from checkout to delivery and returns. It records payment and fulfillment status, reserves stock, routes the order to the right location for picking and packing, creates shipping labels and tracking updates, and processes refunds and returns.
Is an order management system the same as inventory management?
No. Inventory management tracks how much stock is held and when to reorder, while order management tracks what happens to each customer order. The two are closely linked: every order placed, canceled or returned changes the available stock.
Does Shopify have built-in order management?
Yes. According to the Shopify Help Center, the Shopify admin tracks an order status, a payment status and a fulfillment status for every order, supports individual, bulk and batch fulfillment, and lets merchants buy and print shipping labels. Third-party apps add features such as multi-warehouse routing.
How long does an online store have to ship an order in the US?
Under the FTC Mail, Internet, or Telephone Order Merchandise Rule, a US seller must ship within the time it advertised, or within 30 days if no time was stated (50 days if the customer applies for credit to pay). If it cannot, it must notify the customer and offer the option to cancel for a prompt refund.
When does a small store need a dedicated OMS?
A small store usually needs a dedicated order management system when it sells on several channels, ships from more than one location, or manages orders and stock in spreadsheets. A single-channel store can often rely on its eCommerce platform’s built-in order tools.
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