Choose FBA (Fulfillment by Amazon) if your products are small, light and sell quickly, because Prime eligibility and a stronger Buy Box usually lift sales. Choose FBM (Fulfillment by Merchant) if your products are bulky, slow-moving, fragile or custom-made, or if you want tighter control over cost and packaging. Many sellers use both, and the right answer can differ product by product.
This guide compares FBA and FBM on fees, Prime and the Buy Box, control, returns, risk and scale, with 2026 data, two worked profit examples and a decision tree you can apply to your own catalogue.
FBA means Amazon stores, packs, ships and handles returns, in exchange for fulfilment and storage fees. FBM means you do it all yourself and pay your own shipping. About 82% of active Amazon sellers use FBA, according to a 2026 industry estimate, because Prime and the Buy Box boost conversion. But FBM can earn more profit per unit on bulky, heavy or slow-selling items. A hybrid (FBA for best sellers, FBM for the rest) is common and often smartest.
⚡ Key Takeaways
- About 82% of active Amazon sellers use FBA; 68% use FBA only, 21% use both and 11% use FBM only (AMZPrep industry estimate, updated August 2026).
- FBA gives Prime eligibility and handles returns; FBM gives control and avoids storage fees.
- Amazon’s FBA fees include fulfilment, monthly storage and aged-inventory fees for stock held 181+ days.
- On a small, light $25 item, FBA earned more in our worked example; on a large, heavy $60 item, FBM did.
- FBA fees rose about $0.08 per unit on average from January 15, 2026, so re-check your margins.
- Seller Fulfilled Prime lets FBM sellers show the Prime badge, but only if they pass strict delivery tests.
What Is FBA, and What Is FBM?
According to Amazon, FBA lets you “outsource order fulfillment to Amazon and offer customers free, two-day shipping through Prime.” You send inventory to Amazon’s fulfilment centres, and Amazon picks, packs and ships orders and handles customer service and returns.
With FBM, you store the product (at home, in a warehouse or with a 3PL), pack it and ship it to the customer yourself, then handle questions and returns. Amazon still shows your listing and takes its referral fee, but you control fulfilment.
If you have not opened your account yet, start with our guide on how to open a store on Amazon. The rest of this article assumes you are selling and want to choose how to ship.
How Many Sellers Use FBA vs FBM in 2026?
Amazon does not publish an official FBA adoption rate, so treat these as industry estimates. According to AMZPrep (updated August 27, 2026), about 82% of active sellers use FBA. In its dataset, 68% use FBA only, 21% use both FBA and FBM, and 11% use FBM only.
| Fulfilment approach | Share of active sellers (AMZPrep estimate) |
|---|---|
| FBA only | 68% |
| Both FBA and FBM (hybrid) | 21% |
| FBM only | 11% |
Different research firms define “active seller” differently, so other surveys report slightly different splits. The pattern is consistent, though: most sellers lean on FBA, and a sizeable minority run a hybrid.
FBA vs FBM: Side-by-Side Comparison
| Factor | FBA | FBM |
|---|---|---|
| Who ships and stores | Amazon | You (or your 3PL) |
| Prime badge | Automatic | Only through Seller Fulfilled Prime |
| Buy Box | Strong advantage | Weaker unless metrics and speed are excellent |
| Customer service and returns | Amazon handles | You handle |
| Fees | Referral + fulfilment + storage (+ aged inventory and other fees) | Referral + your own shipping, packing and storage |
| Upfront cash | Higher (stock sits in Amazon’s warehouses; fees apply) | Lower |
| Control over packaging and branding | Limited | Full |
| Scalability | Easy to scale volume | Needs staff, space and systems as you grow |
| Best for | Small, light, fast-selling products | Bulky, heavy, fragile, slow-moving or custom items |
FBA vs FBM Fees: A Worked Profit Example
Fees are where most sellers decide. Amazon’s FBA charges include fulfilment fees (based on price, weight and dimensions), monthly storage fees by cubic foot, aged-inventory fees for items stored 181+ days, returns processing and removal charges (per Amazon’s FBA page). FBM costs are your own shipping, packing materials, labour and storage.
The two examples below are illustrative. They use a 15% referral fee and made-up but realistic shipping and FBA costs, so replace them with your own numbers.
| Per unit | Small item, FBA | Small item, FBM | Large item, FBA | Large item, FBM |
|---|---|---|---|---|
| Selling price | $25.00 | $25.00 | $60.00 | $60.00 |
| Product cost | $7.00 | $7.00 | $20.00 | $20.00 |
| Referral fee (15%) | $3.75 | $3.75 | $9.00 | $9.00 |
| FBA fulfilment fee | $4.50 | – | $15.00 | – |
| Inbound shipping and storage | $1.00 | – | $2.50 | – |
| Own shipping, packing and labour | – | $8.00 | – | $14.00 |
| Profit per unit | $8.75 | $6.25 | $13.50 | $17.00 |
The lesson is not that one method always wins. Parcel shipping is cheap for FBA on small, light items because Amazon’s rates are built for them, while heavy items carry steep FBA fees that can exceed your own freight. Do this calculation for your top ten products, not your average product.
💡 Pro Tip: This only compares costs. FBA often lifts sales through Prime and the Buy Box. If FBA doubles your unit sales on the small item, the $8.75 comparison is even more lopsided.
What Changed in 2026
- Amazon announced that FBA fees would rise by an average of $0.08 per unit from January 15, 2026, with no referral fee increase, in its 2026 fee announcement. Averages hide size-tier differences, so check your own products in the fee preview.
- Amazon’s FBA page describes aged-inventory fees for items stored 181+ days, so slow sellers can quietly become expensive on FBA.
- New professional sellers can access up to $50,000 in credits and incentives through Amazon’s FBA new-seller programme (see Amazon’s FBA page for terms), which can soften early FBA costs.
Prime, the Buy Box and Conversion
Prime eligibility is FBA’s biggest advantage. The Prime badge builds trust and fast-delivery shoppers filter for it, and the Buy Box (the Add to Cart box) tends to favour FBA and Seller Fulfilled Prime offers. Analyses such as Repricer’s 2026 Buy Box guide estimate the Buy Box accounts for about 82% of Amazon sales, so losing it hurts.
With FBM, you can still win the Buy Box on price and strong seller metrics, but you will often be competing against Prime offers. That is why many FBM sellers consider Seller Fulfilled Prime.
Seller Fulfilled Prime (SFP): The Middle Path
SFP lets you ship from your own warehouse and still show the Prime badge. It is demanding. According to SPS Commerce’s 2026 guide, you generally need 100+ self-fulfilled packages, a cancellation rate under 2.5%, valid tracking above 95% and a late shipment rate below 4% before entering a roughly 30-day trial, and Amazon reviews performance weekly afterwards. SellerSprite reports that Amazon raised SFP delivery-speed requirements from July 6, 2026. Check Seller Central for the current rules before you plan around it.
Control, Returns and Customer Service
- Branding and packaging: FBM lets you use custom boxes, inserts and thank-you cards. FBA limits you to Amazon’s packaging.
- Returns: Amazon processes FBA returns, which saves time but means you cannot inspect or restock items as you wish. With FBM you control the policy and keep the return data.
- Customer service: Amazon handles FBA service, while FBM puts message response and delivery issues on you, and these feed your account health.
- Quality control: FBM lets you inspect items before they ship, which matters for fragile, high-value or made-to-order products.
Whichever you choose, keep an eye on your order defect rate and late shipment rate. Our Amazon store guide explains the basics, and Amazon account management services cover ongoing account-health monitoring.
Risk, Storage and Inventory Control
FBA’s risks are mostly about money tied up in stock: storage fees, aged-inventory fees and the chance of lost or damaged units in transit or in the warehouse. Amazon reimburses many inventory losses, but you often have to spot and claim them. A FBA shipment reconciliation service can reconcile what you sent against what Amazon received and recover what is owed.
FBM’s risks are operational. Shipping delays, stock-outs in your own warehouse and weak packaging can damage your metrics fast, and you carry the labour cost as order volume rises.
| Risk | FBA | FBM |
|---|---|---|
| Storage and aged stock fees | Yes | No (your own storage costs) |
| Lost or damaged inventory | Possible, claimable | Your own risk |
| Late shipments and defects | Mostly Amazon’s | Yours, and they hit your metrics |
| Labour and space growth | Low | High as volume grows |
FBA vs FBM: Which Should You Choose?
Choose FBA if…
- Your product is small, light and standard-size.
- It sells fast, so stock does not sit for 180+ days.
- You want Prime and a stronger Buy Box position.
- You prefer to spend your time on sourcing, listings and ads rather than packing boxes.
- You can fund inventory and fees up front.
Choose FBM if…
- The item is large, heavy, fragile or oversized.
- It sells slowly or seasonally.
- It is custom, personalised or made to order.
- You need full control over packaging and the unboxing experience.
- Your margins are thin and FBA fees would erase them.
Consider a Hybrid Model
Send your best sellers to FBA and keep slow movers or bulky variations on FBM, so you capture Prime where it pays and avoid aged-inventory fees where it does not. Many sellers also keep FBM as a back-up when FBA stock runs out, which helps protect their listings.
Common Mistakes When Choosing a Fulfilment Method
- Choosing FBA for every product without checking size-tier fees.
- Sending large inventory batches before testing demand, then paying aged-inventory fees.
- Using FBM without a plan for fast shipping and tracking, then failing delivery targets.
- Comparing only fees and ignoring the sales lift from Prime and the Buy Box.
- Never re-running the numbers when Amazon updates fees.
- Not reconciling FBA shipments, which leaves reimbursable losses unclaimed.
If you are weighing channels, compare global marketplaces, and see our guide to improving ecommerce conversion, since a better listing lifts either method. Strong titles and keywords from our Amazon SEO services help both too.
Practical Action Plan
- Do This Now: list your top ten products by revenue, and calculate profit per unit under FBA and FBM using Amazon’s fee preview and your real shipping costs.
- Do This Now: flag items that have been in stock more than 120 days and decide whether to discount, remove or move them to FBM.
- Worth Doing: test FBA on one fast, small product and compare sales and profit against your FBM baseline for 30 days.
- Worth Doing: reconcile your last three FBA shipments against Amazon’s receipts.
- Low Priority: look into Seller Fulfilled Prime only if you already ship quickly and reliably from your own warehouse.
- Low Priority: if the workload is too heavy, consider outsourcing with our Amazon account management services.
Frequently Asked Questions
What is the difference between FBA and FBM?
With FBA, Amazon stores your stock and picks, packs, ships and handles returns. With FBM, you do all of that yourself. FBA brings Prime eligibility and often a stronger Buy Box; FBM gives you control and avoids FBA fees.
Is FBA or FBM cheaper?
It depends on the product. FBA is often cheaper for small, light items because Amazon’s shipping rates are efficient at that scale. FBM can be cheaper for large, heavy or slow-selling items because FBA fulfilment and storage fees are higher. Run the numbers for each product.
Is FBA better for beginners?
Usually yes. It removes shipping and customer service work and gives the Prime badge. But beginners should start with small batches to avoid storage and aged-inventory fees.
Can I use both FBA and FBM?
Yes. AMZPrep’s 2026 estimate is that 21% of sellers use both. Many sellers use FBA for best sellers and FBM for bulky or slow items, or as a backup when FBA stock runs out.
What is Seller Fulfilled Prime?
A programme that lets approved sellers ship from their own warehouses with the Prime badge. It requires passing a trial and meeting strict delivery and tracking targets that Amazon reviews weekly.
What FBA fees should I expect in 2026?
Fulfilment fees by size and weight, monthly storage fees, aged-inventory fees for stock held 181+ days, and returns or removal fees. Amazon said average FBA fees would rise by $0.08 per unit from January 15, 2026.
Does FBA help me win the Buy Box?
It helps. FBA and Seller Fulfilled Prime offers are favoured, though price, order defect rate and shipping speed also matter, and Amazon does not publish the weights.
When should I switch from FBM to FBA?
When your product is small and light, sells steadily, has margin left after FBA fees and you want to lift conversion with Prime. Test one SKU first and compare the results.
Conclusion: Let the Numbers Decide
FBA and FBM are tools, not identities. Use FBA where Prime and convenience earn more than the fees cost, use FBM where size, speed or control make it cheaper or safer, and re-check every few months as fees and your catalogue change.
If you want help modelling the numbers, reconciling FBA shipments or running the account day to day, talk to our team about Amazon account management services.
Statistics are cited with their source and date. Worked examples are illustrative, not guarantees. Fees and programme rules change, so confirm current figures in Seller Central.
