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Originally published on April 18, 2024 Last updated on March 6, 2026

Replenishment Strategies for FBA: Avoid Amazon’s Low Inventory Fees

Selling on Amazon is a whole new world beyond selling on your webstore. There’s a lot involved in sustaining continuous sales on Amazon beyond just having products listed on the world’s largest marketplace. To set your Amazon business up for success, one of the main areas to focus on is inventory: the flow, the costs, […]

Selling on Amazon is a whole new world beyond selling on your webstore. There’s a lot involved in sustaining continuous sales on Amazon beyond just having products listed on the world’s largest marketplace. To set your Amazon business up for success, one of the main areas to focus on is inventory: the flow, the costs, the timing of it all.

Amazon’s recent introduction of low inventory fees is a key development you need to be aware of. These fees penalize sellers for consistently maintaining low stock levels relative to historical sales data.

So, how do you avoid running out of stock? Or getting below the 28 days of historical daily sales threshold? It’s probably easier than you think, but does require some diligence to track and check in on levels. More on that below…

Read more: Replenishment Strategies for FBA: Avoid Amazon’s Low Inventory Fees

This crucial component is often overlooked among exciting advertising and merchandising options, but ensuring you have enough inventory to meet that ongoing demand is important not just for sales, but to stay in good graces with Amazon.

The key to avoiding this lies in a strategic FBA inventory replenishment strategy. By proactively managing your stock levels, you can ensure your products are always available, keeping customers happy, your business thriving on Amazon, and avoiding pesky fees.

Understanding Amazon’s Replenishment Landscape

It’s easy to sign up for the magic of Fulfillment by Amazon (FBA): you send your products to Amazon’s warehouses, and they take care of everything from picking and packing to shipping directly to your customers. Sounds convenient, right?

However, FBA throws a few twists into inventory management. While Amazon handles the logistics, the responsibility of ensuring you have enough stock to meet customer demand falls squarely on you, the seller. And, with fees that penalize the seller for sending in too little, along with fees that get applied for slow-moving stock, this is where a strategic FBA replenishment strategy becomes crucial.

To navigate this landscape effectively, understanding three key metrics is essential:

  • Sell-through Rate:  This metric reveals the average number of units you sell per specific period (week or month) on specific product SKUs (or ASINs in the Amazon world). Knowing your sell-through rate helps predict future demand and determine how quickly your inventory moves.
  • Lead Time: This refers to the time it takes for your order to be placed with your supplier and for the inventory to arrive at an Amazon fulfillment center. Lead time can vary depending on factors like your supplier’s location, manufacturing processes, and even global shipping delays.
  • Safety Stock: This buffer inventory acts as a lifeline during unexpected sales surges or unforeseen delays. Having enough safety stock prevents overselling and stockouts and ensures you can continue fulfilling orders even when faced with temporary hiccups.

Building a Replenishment Strategy

Having key data points for sell-through rate and lead time is great, but what do you do with that information? How will this help you to have a well-stocked virtual shelf on Amazon? As selling through FBA, utilizing Amazon’s fulfillment centers, and working within their processes are more complex, a strategic replenishment plan is the key to ensuring your products are always available, preventing stockouts, and maximizing sales.

Here’s how to build a robust replenishment strategy with the right data:

1. Data-driven Decisions

Your historical sales data is a goldmine of insights. Download reports and segment into rolling periods of the 28, 60, and 90-day periods; look at this period over last period and this period over last year’s period (i.e. month over month and month over the same month last year). Analyze it thoroughly to understand your average daily/weekly/monthly sales (sell-through rate) for each product. This data becomes the foundation for forecasting future demand. Then, add your supplier lead times in, as well as time to Amazon’s fulfillment centers to get the full FBA inbound restock timeline to prevent low-inventory fees and stay within ideal stock levels (one to 5 months’ worth).

2. Consider Seasonality

Not all months are created equal. Some products experience significant sales fluctuations throughout the year. Think summer spikes for pool supplies or holiday spikes for toys or winter wear. Ignoring seasonality in your replenishment plan is a recipe for disaster. Factor in historical sales trends beyond the current 30- or 90-day period. Look to last year’s trends and results, match that to the current sales trend and then examine demand planning to adjust your reorder points accordingly.

3. Remember Lead Time

Lead time: we talked about it earlier and it’s worth calling out on its own. This key timing (the time between placing an order and receiving inventory) is crucial. Receiving inventory to your warehouse from suppliers is one thing. Then, when working with Amazon, it’s important to also factor in the additional timeframe to get to Amazon’s fulfillment centers. Miscalculating lead time, whether just to FBA or in from your supplier, can lead to stockouts and lost sales. Consider factors like:

  • Supplier location: Overseas suppliers often have longer lead times than domestic ones.
  • Manufacturing processes: Complex products might involve longer production times.
  • Shipping delays: Whether for global holidays, peak season capacity, or unforeseen delays, allow some buffer time for your deliveries as many things can disrupt your perfectly calculated arrival date.

4. Set Reorder Points

This is where you build in buffer time. Reorder points are thresholds at which you stop selling inventory and start looking into reordering products. This can be done on one sales channel or across all. Setting accurate reorder points allows you to proactively manage those critical moments for when you need to restock your inventory, vs. rushing at the last minute to avoid stockouts. Consider it your pre-determined inventory level at which you trigger a new order. Here’s the formula:

Reorder Point = (Average Daily Sales x Lead Time) + Safety Stock

  • Average Daily Sales: This comes from your historical sales data analysis.
  • Lead Time: Factor in the time it takes to receive new inventory.
  • Safety Stock: This buffer protects you from unexpected demand surges or delays.

Inventory Management Software: Your FBA Replenishment Partner

While the core principles of data analysis, seasonality awareness, lead time consideration, and reorder points form the foundation of a strong FBA replenishment strategy,  implementing these strategies effectively can be daunting, especially as your business scales.

This is where sophisticated inventory management software solutions become your secret weapon. Imagine having a powerful partner that streamlines your entire FBA journey, automating tedious tasks and empowering you with the insights needed to make informed decisions.

  • Real-time Data Analysis: Constantly monitor inventory levels and sales trends and identify potential stockouts.
  • Sales Forecasting: Utilize advanced algorithms to predict future demand based on historical data and seasonal trends.
  • Automated Ordering: Set reorder points and automate purchase orders based on calculated lead times and forecasted demand.
  • Integration with FBA: Seamlessly connect with Amazon’s system for real-time inventory visibility and efficient shipment management.

Streamline FBA with Finale Inventory

Finale Inventory can streamline your entire FBA process, empowering you with the following:

  • Data Analytics at Your Fingertips: Ditch the spreadsheets and manual calculations. Finale Inventory serves as a centralized dashboard that provides a comprehensive view of your inventory performance across Amazon, as well as other marketplaces and webstores. This real-time data empowers you to identify trends, analyze sales velocity, and make data-driven decisions regarding replenishment needs.
  • Intelligent Forecasting: Move beyond guesswork. Finale leverages advanced algorithms that analyze historical sales data, factor in seasonality, and account for external influences. This enables you to predict future demand with exceptional accuracy, minimizing the risk of stockouts and ensuring you have the right amount of inventory to meet customer needs. Further, you can receive reorder notifications, ensuring you never miss a beat on the business.
  • Automated Replenishment: Say goodbye to manual order placement. Finale enables businesses to set up automatic reorder points based on your calculated lead time and forecasted demand. The software will then automatically trigger purchase orders to your suppliers, ensuring a steady flow of inventory without the need for constant monitoring.
  • Effortless Integration with FBA: Seamlessly connect Finale Inventory with Amazon’s system for real-time inventory visibility. This eliminates the need for manual data entry and ensures efficient shipment management, allowing you to focus on growing your business.

By incorporating these replenishment strategies for FBA, Finale Inventory becomes your trusted partner in navigating the complexities of FBA inventory management.


Ready to streamline your FBA experience and regain control of your stock levels? Explore how Finale Inventory can empower you to build a winning replenishment strategy and watch your Amazon business soar.

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“The core of maturity, that I see, is starting with a unified view of inventory. I’ve got to be able to accurately represent what do I have, make sure that I know where it’s located so I can get it to my customers quickly.”

— Troy Graham, Descartes

What is the first thing I should fix if I want to scale operations?

Start with a unified view of inventory. The core of maturity starts with being able to accurately represent what you do have and make sure that you know where it’s located to get it to customers quickly. Without a unified view across your warehouses, 3PLs, and vendors, you cannot make the best decisions because you don’t have the best information at hand.

With Inventory Visibility, Businesses Can Make Smarter Allocation Decisions

Once inventory is centralized, businesses can move from reactive updates to intentional allocation. They can decide how much inventory to expose to each channel, when to use buffers, which marketplaces need extra protection, and how seasonality or campaign performance influence availability.

Once I know what inventory I have, how should I decide where to make it available?

Inventory allocation should reflect where orders are coming from, where marketing is working, and which channels carry the most risk. Once you know what you have and where it is located, you can think more strategically using centralized inventory to make prioritization happen automatically. One fertilizer company lost a little over 5,000 orders in one weekend because someone manually uploaded the wrong available inventory to Amazon.

Better Inventory Data Improves Planning, Purchasing, and Growth Bets

Better visibility turns inventory data into a planning tool. With insight into sales velocity, inventory levels, vendors, and channel performance, businesses can make more informed replenishment decisions, avoid overbuying, and test new product lines or vendor-supplied inventory without taking on unnecessary risk.

“You have to have unified inventory to know how to price your products just at that basic level. I can’t price my products if I don’t know the true cost to get it.”

— Mike Bernico, Flxpoint

How does better inventory data help me make smarter buying decisions?

It lets you measure whether your plan is working before you commit more capital. A key question becomes: “Did my plan work? Am I overleveraged in one place or another?” Centralized systems can also help businesses test new product lines or vendor relationships by looking at sales velocity by channel, allowing them to take risks in a calculated and measured way.

Intelligent Order Routing Turns Inventory Complexity Into Automation

Once inventory and supplier data are reliable, businesses can automate fulfillment decisions. Orders can be routed based on cost, speed, margin, location, warehouse priority, vendor fallback, split-shipment rules, or customer expectations. This helps hybrid fulfillment scale because every order does not need a manual review.

How do I decide the best way to fulfill each order?

There is no single answer, which is why order routing needs to account for the context of each order. Intelligent order routing is not just sending an order to someone who has stock; it is taking each and every order and treating it like its own unique use case. Depending on the order, the business may prioritize speed, margin, an internal warehouse, vendor fallback, or preventing split shipments.

Supplier Inventory Sync Extends Inventory Beyond the Four Walls

For hybrid fulfillment to work, supplier inventory needs to become part of the operating model. Supplier sync does not always require advanced technology; it can happen through automated files, FTP, email, APIs, EDI, or ecommerce storefront integrations. The key is replacing manual updates with automated, reliable supplier data.

Can supplier inventory really be treated like part of my own inventory?

Yes, but the goal is not necessarily to force every supplier into a complex integration. Real-time supplier sync can be defined as any way to get an automated update from a supplier, such as Google Sheets, email, FTP, API, EDI, or ecommerce storefront connections. The key is that accurate supplier stock is foundational. If you don’t have an accurate view of what is in stock with your suppliers, you cannot tell your sales channel accurately what’s available.

Exception-Based Workflows Keep Humans Focused Where They Matter

Automation does not remove people from the process. Mature operations let technology handle the routine majority while humans focus on exceptions, such as high-value orders, fraud risk, compliance requirements, restricted products, export rules, or unusual fulfillment scenarios.

If my business has special cases, can automation still work?

Yes. The point is not to automate every possible decision; it is to automate the routine work and surface the exceptions. Businesses should not have to look at every single order. Instead, technology can highlight high-value orders, risky locations, or compliance requirements. The goal is to take care of the 80% of workflows that are obvious while still allowing human review when specific exceptions arise.

The Right Inventory Technology Should Fit the Business, Not Overwhelm It

Software decisions should be based on business fit, not popularity, feature volume, or broad “all-in-one” promises. Growing ecommerce businesses should identify their highest-impact bottleneck, prioritize what matters now, and choose technology that is right-sized but flexible enough to support future phases of growth.

How should I choose software without overbuying or picking the wrong system?

Start with your priorities, not the biggest feature list. Avoid an all-in-one system that claims to “do everything under the sun” and look for a “best of breed approach” with systems that can scale as you add channels or vendors. The practical advice is to stack rank what matters now, make sure the system can support future phases, and choose technology that fits your business rather than overwhelming it.

How to Scale Ecommerce Operations Beyond Spreadsheets

For many growing ecommerce businesses, Finale and Flxpoint work together as a practical answer to these challenges. Finale helps centralize and manage internal inventory, purchasing, warehouse operations, and stock visibility, while Flxpoint helps connect vendor inventory, automate supplier sync, and route orders across hybrid fulfillment networks. Together, they give businesses a best-of-breed way to improve inventory accuracy, reduce spreadsheet work, and scale fulfillment without forcing every process into a one-size-fits-all system.

Ecommerce Fulfillment Operations FAQ

What Is Ecommerce Fulfillment Operations?

Ecommerce fulfillment operations are the processes that move an online order from purchase to delivery. This includes managing inventory, syncing product availability across channels, routing orders to the right warehouse, 3PL, supplier, or vendor, and making sure the customer receives the right product on time. As discussed in the webinar, fulfillment is no longer limited to “what’s in my warehouse these days”; growing businesses may rely on internal warehouses, 3PLs, marketplace fulfillment services, and supplier inventory at the same time.

What Are Ecommerce Fulfillment Operation Examples?

Examples of ecommerce fulfillment operations include updating inventory across Shopify, Amazon, Walmart, and other sales channels; allocating inventory to specific marketplaces; sending orders to an internal warehouse, 3PL, or vendor; syncing supplier inventory through files, APIs, EDI, email, or FTP; replenishing warehouse stock based on sales velocity; and flagging exceptions such as high-value orders, compliance requirements, or restricted products. In the webinar, the speakers also discussed hybrid fulfillment examples where a business may fulfill some products from its own warehouse and use vendors as a fallback or extension of available inventory.

How Can I Track My Inventory at an Ecommerce Fulfillment Center?

The best way to track inventory at an ecommerce fulfillment center is to create a unified inventory view that shows what is available, where it is located, and how that inventory connects to each sales channel. That means tracking inventory across internal warehouses, fulfillment centers, 3PLs, marketplace fulfillment programs, and supplier locations instead of relying on disconnected spreadsheets. The webinar emphasized that businesses need to “accurately represent” what they have and know where it is located so they can get products to customers quickly.

How Can I Connect My Inventory to My Supplier?

You can connect supplier inventory through several methods, depending on what the supplier supports. The webinar discussed low-tech and advanced options, including automated Excel or CSV files, Google Sheets, email updates, FTP servers, APIs, EDI, and direct connections to ecommerce storefronts such as Shopify, BigCommerce, or Magento. The key is to ask suppliers how they share inventory today, then use a system that can automate that data flow instead of manually copying supplier inventory into spreadsheets.

What Is Ecommerce Order Routing?

Ecommerce order routing is the process of deciding where an order is fulfilled from after a customer buys. In a simple operation, every order may go to one warehouse. In a more complex or hybrid fulfillment model, the best fulfillment source may depend on inventory availability, shipping speed, cost, margin, customer location, warehouse priority, vendor fallback rules, or whether the order should be split. The webinar described intelligent order routing as treating each order like its own use case, so businesses can automate the best fulfillment decision without manually reviewing every order.

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