Short answer: Choose FBA for SKUs that sell steadily, are small enough to keep fulfillment fees reasonable and benefit from the Prime badge. Choose FBM for slow movers, bulky or awkward items, products with tight margins, and anything you want to control yourself. Most growing sellers end up running both, decided SKU by SKU.
This guide explains what each method means in 2026, what changed this year, and how to score each product in your catalog.
FBA and FBM in one paragraph each
Fulfillment by Amazon (FBA)
With FBA, you send inventory to Amazon's fulfillment centers. Amazon says it will "pick, pack, and ship orders, as well as handle customer service and returns" for those products, and FBA items are eligible for Prime shipping. In return, you pay fulfillment fees (based on the product's price, weight and dimensions), monthly storage fees, an aged inventory fee for stock stored a long time, and fees for returns processing, removals and disposals.
Fulfilled by Merchant (FBM)
With FBM, you store, pack and ship each order yourself or through your own warehouse team. Amazon's FBM page says you must confirm shipment within your stated handling time and respond to return requests within 24 hours. Your performance is measured on the Account Health dashboard: order defects, late shipments, pre-fulfillment cancellations and valid tracking. FBM sellers who meet Amazon's performance requirements may be able to join Seller Fulfilled Prime and show the Prime badge on their own shipments.
Both methods pay the same kind of referral fee on each sale. Amazon describes it as a percentage of the total price or a minimum amount, whichever is greater.
What changed for FBA in 2026
As of October 2026, three FBA changes from Amazon's own announcements matter for this decision:
- Fee update. Amazon announced that US FBA fees would rise by an average of $0.08 per unit sold from January 15, 2026, with "no new FBA fee types in 2026." The change varies by size tier and price band, so check the Revenue Calculator for each SKU rather than relying on the average.
- Fuel and logistics surcharge. From April 17, 2026, Amazon added a 3.5% fuel and logistics-related surcharge to FBA fulfillment fees in the US and Canada. It is calculated on fulfillment fees, not on the sale price.
- No more Amazon prep in the US. Amazon's developer changelog states that from January 1, 2026, "prep and item labeling services for Fulfillment by Amazon (FBA) shipments will no longer be available in the US marketplace." Bagging, labeling and other prep is now your job or your prep partner's.
None of these makes FBA a bad choice, but they make the per-SKU math more important.
FBA vs FBM at a glance
| Factor | FBA | FBM |
|---|---|---|
| Who stores, picks, packs and ships | Amazon | You or your warehouse |
| Customer service and returns | Handled by Amazon for FBA orders | You; respond to return requests within 24 hours |
| Prime badge | Yes, FBA items are Prime-eligible | Only through Seller Fulfilled Prime, if you qualify |
| Main costs | Fulfillment, monthly storage, aged inventory, returns, removal and disposal fees | Your own storage, packaging, labor, shipping labels and software |
| Inventory limits | Monthly FBA capacity limits set by Amazon | Limited only by your own space |
| Prep | Your responsibility in the US since January 1, 2026 | Your responsibility; you pack the final box |
| Control and evidence | Amazon controls the physical process | You control packing, packaging and package evidence |
| Biggest risk | Fees and storage costs on slow or bulky stock | Late shipments and tracking problems hurting account health |
This is a qualitative comparison. Fees and programs change, so confirm current figures in Seller Central before deciding.
Five questions to ask about every SKU
1. How big and heavy is it?
FBA fulfillment fees depend on size and weight, and storage is charged by volume. Small, light items usually fit FBA well. Oversized or awkward items can cost more to store and ship through FBA than through your own carrier accounts, so they are often FBM candidates.
2. How fast does it sell?
FBA storage is charged monthly on the volume you hold, and Amazon charges an aged inventory fee on stock stored for a long time. A SKU that sells through quickly spends little time in storage. A SKU that sells a few units a month can sit in Amazon's warehouse long enough for storage to eat the margin. Slow movers often belong in FBM, where they wait on your own shelf.
3. Will FBA capacity allow it?
Amazon uses a monthly FBA capacity limit to control how much inventory you can send and store. According to Amazon, these limits are influenced by your Inventory Performance Index (IPI) score, sales forecasts for your ASINs, shipment lead time and fulfillment-center capacity. If your capacity is tight, give it to the SKUs that earn the most from Prime and fast turnover, and fulfill the rest yourself.
4. What is the margin after fees?
Run every SKU through Amazon's Revenue Calculator for both methods. Include the 2026 fee update and surcharge on the FBA side. On the FBM side, include your real labor, packaging, label cost and a share of warehouse rent. Low-priced items with thin margins are where small fee changes hurt most.
5. How much control do you need?
Some products need careful packing, inserts, inspection before dispatch or proof of what went in the box. Some need to be bundled from parts you buy separately. FBM gives you that control and a record of what shipped. FBA gives you speed and the Prime badge, but you hand over the physical process.
A scoring table for your catalog
Score each SKU from 0 to 2 on the factors below. A high total points to FBA; a low total points to FBM. The scoring is a starting point, not a rule.
| Factor | Score 2 (favors FBA) | Score 1 | Score 0 (favors FBM) |
|---|---|---|---|
| Size and weight | Small and light | Standard but heavy | Oversized or awkward |
| Sales speed | Sells through quickly | Steady but slow | Occasional sales |
| Margin after FBA fees | Comfortable | Thin | Negative or near zero |
| Prime importance | Category where buyers filter by Prime | Mixed | Buyers rarely filter by Prime |
| Prep complexity | Ready to ship as is | Simple labeling or bagging | Bundles, kits, fragile or inspected items |
| Capacity pressure | Plenty of FBA capacity | Some pressure | Capacity is fully used |
Re-score each quarter. A SKU can move from FBM to FBA once it proves steady demand, and back again if it slows down.
Running a hybrid catalog without chaos
Running both methods is common, but it adds a second operation. Your FBA work is replenishment: forecasting, prep, inbound shipments and watching storage. Your FBM work is a daily order-to-ship loop: importing orders, spotting stock shortfalls, purchasing, receiving, picking, packing, shipping with tracking and reviewing profit.
The FBM side is where most hybrid sellers struggle, because it needs a live process rather than a monthly restock. We cover it stage by stage in the Amazon FBM order-to-ship workflow, and explain the tools side in running FBM operations without spreadsheets.
Two habits keep a hybrid catalog under control: record each SKU's method with the date and reason it was chosen, and watch FBM late shipment and valid tracking rates weekly, because FBM orders are the ones you can make late.
If you are still choosing a sourcing model rather than a fulfillment method, read online arbitrage vs wholesale or our comparison of FBA vs dropshipping.
Where ECOMHUTSY fits
ECOMHUTSY has worked in e-commerce operations since 2016, has processed $150M+ in e-commerce sales and has a team of 100+ e-commerce professionals. We support both sides of a hybrid catalog:
- FBA: our FBA wholesale management service covers supplier research, offer setup and pricing checks, FBA prep guidance, inbound coordination, restocking and aged-stock discipline.
- FBM: HutsyBoard, our Amazon FBM warehouse software, runs the order-to-ship loop in one workspace. It connects to Seller Central through SP-API OAuth (no shared passwords; tokens encrypted at rest; disconnect any time) and covers orders and shortfall, purchasing with supplier proof, QR receiving, owned and shared inventory, FBM pick, pack and ship, profit and multi-tenant roles. You can start a trial at hutsyboard.com.
Neither a service nor software can promise a sales, profit or account-health result. What they can do is make the per-SKU decision visible and the daily process harder to skip.
Frequently asked questions
Is FBA or FBM more profitable?
Neither is more profitable across the board. FBA tends to suit small, fast-selling items that benefit from Prime. FBM tends to suit bulky, slow or low-margin items. Compare both for each SKU using Amazon's Revenue Calculator plus your own real FBM costs.
Can I use FBA and FBM in the same account?
Yes. Many sellers fulfill some SKUs through FBA and others themselves. The key is to track which method each SKU uses and why, and to run the FBM side with a proper daily process.
Can FBM orders get the Prime badge?
Only through Seller Fulfilled Prime. Amazon says sellers who meet its performance requirements may join and show the Prime badge on offers they ship themselves.
Do I still need to prep products for FBA?
Yes. From January 1, 2026, Amazon no longer offers prep and item labeling services for FBA shipments in the US marketplace, so you or a prep partner must prepare and label units before sending them in.
Who handles returns under FBM?
You do. Amazon's FBM page says you must respond to return requests within 24 hours using Manage Returns.
Decide your catalog SKU by SKU
Not sure which of your SKUs belong in FBA and which in FBM? Bring your catalog and current costs, and an ECOMHUTSY operator will walk through the decision with you.
Amazon fees, programs and policies change. This article reflects publicly available Amazon information as of October 2026. Always check Seller Central for current fees and requirements.
Sources
- Amazon, Fulfillment by Amazon (what FBA handles, Prime eligibility, fee types): https://sell.amazon.com/fulfillment-by-amazon
- Amazon, Fulfilled by Merchant (handling time, 24-hour returns response, Seller Fulfilled Prime, Account Health metrics): https://sell.amazon.com/programs/fulfilled-by-merchant
- Amazon, Selling fees (referral fee definition): https://sell.amazon.com/pricing
- Amazon Seller Forums, News_Amazon, 2026 Updates to US Referral and Fulfillment by Amazon Fees: https://sellercentral.amazon.com/seller-forums/discussions/t/f3fa3211-820b-4e2e-a023-158a9cf55f99
- Amazon Seller Forums, News_Amazon, Fuel and logistics-related surcharge: FBA, MCF, and BWP in US and CA: https://sellercentral.amazon.com/seller-forums/discussions/t/7cbc0233-ee5b-4359-978a-dee7cad5c6f4
- Amazon SP-API Changelog, US FBA prep and labeling services to end January 1, 2026: https://developer-docs.amazon/sp-api/changelog/us-fba-prep-and-labeling-services-to-end-january-1-2026
- Amazon, Announcing a new streamlined FBA capacity management system (IPI and other factors): https://sell.amazon.com/blog/announcements/fba-capacity
