What Is Amazon FBA? How to Calculate Cost and Profit (2026)

Amazon FBA is the fulfillment model where you send your products to Amazon’s warehouse and hand over storage, packing, shipping, customer service and returns to Amazon. That’s the short answer; but the question that actually burns sellers is this: what does that convenience cost, and can your product carry it? Because in FBA, it isn’t just commission that comes off the price — at least three separate fee items (referral, fulfillment, storage) are deducted. Saying “I sell on Amazon” without accounting for these usually ends with the seller selling at a loss a product they thought was profitable. In this article you’ll see what FBA is, how it differs from FBM, all the fee items, and how to calculate a product’s net profit step by step.

What is Amazon FBA?

FBA stands for Fulfillment by Amazon. The mechanics are simple: you ship your products in bulk to Amazon’s logistics center, where your stock sits. When an order comes in, Amazon — not you — picks, packs and ships the product to the customer. Shipment tracking, customer questions and the return process are also Amazon’s responsibility. You only worry about restocking the warehouse before you run out and about listing the product.

FBA’s biggest benefit to the seller is the Prime badge and speed: FBA-shipped products promise fast delivery to Prime members, which lifts click-through and purchase rates. When multiple sellers offer the same product, the FBA seller usually has a higher chance of winning the buy box. In return, Amazon charges its operations fee on every order. In other words, FBA is a model where you convert your labor into money: you don’t deal with the warehouse, shipping and returns yourself, but you pay the price of that on every order.

The difference between FBA and FBM

The model opposite FBA is FBM — Fulfillment by Merchant. In FBM the product sits in your own warehouse; when an order comes in you pack it, ship it with your own contracted carrier, and manage customer service and returns yourself. In this model Amazon only takes the referral fee (commission); there is no fulfillment or storage fee. A summary of the two models:

The rough rule: for small, light and fast-selling products the speed and buy box advantage FBA provides is worth the fees; for large, heavy, slow-moving products FBA’s fulfillment and storage fees eat the profit and FBM makes more sense. But you should make this decision with the calculation below, not by gut feel.

FBA fee items

FBA cost is made up of three main items; a fourth group consists of the “invisible” extra fees. Let’s go through them in order.

1. Referral fee (commission)

This is the base commission Amazon takes on every sale and it is common to both FBM and FBA — that is, it is not FBA-specific, it exists on every sale. It varies by category; it roughly sits within a band of about 5% to 20%, and some categories apply a minimum amount. You must verify the exact rate for your category in Amazon Seller Central; rates change over time and quoting a precise figure here would be misleading.

An important VAT difference: on Trendyol, commission is calculated on the VAT-included price and the result is already VAT-inclusive — no VAT is added on top. On Amazon, however, the referral fee is calculated on the VAT-excluded amount, and 20% VAT is added separately to the resulting commission. So the real referral fee you pay is base × rate × 1.20. You claim this VAT as a deduction on your return, but in cash terms it leaves your pocket at that moment. Also take a look at our Amazon commission rates article, where we cover category rates and this VAT logic in detail.

2. FBA fulfillment fee

This is the FBA-specific item and it is the per-order fee Amazon takes for picking, packing and shipping that order. The amount is set by the product’s size and weight: Amazon sorts products into size tiers (small standard, large standard, oversize, etc.) and applies a fixed fulfillment fee for each tier. For a small, light accessory this fee is low, while for a heavy or bulky product it grows quickly and eats the margin. You can see which tier your product falls into and the current fulfillment fee from the FBA fee calculator in Seller Central.

3. Storage fee

You pay a monthly storage fee for the stock you keep in Amazon’s warehouse. This fee is generally calculated on the volume (cubic meters) the product occupies; what matters is how much space your average stock sitting in the warehouse takes up over the month. It has two important nuances:

• Seasonal increase: in the last quarter of the year (usually October–December) warehouses fill up, so the per-unit storage fee rises relative to other months. Entering peak season with a large stock raises the cost.
• Long-term storage fee: an extra penalty is charged on top of the standard storage fee for stock that sits unsold for a long time. On slow-moving products this is FBA’s most insidious cost — a product you can’t sell keeps taking money from you every month.

4. Invisible extra items

Beyond the three main items, expense groups that should enter the profit calculation but that most sellers skip:

• Return handling: in FBA returns, when the product comes back there are handling, inspection and re-stocking costs and the risk of an unsellable return.
• Inbound inventory cost: the shipping cost of getting the product from your location to Amazon’s warehouse is on you.
• Removal / disposal fee: a separate fee is charged for products you want pulled from the warehouse or disposed of.
• Withholding tax (1%): on e-commerce sales the payment institution withholds 1% of the VAT-excluded sale amount as tax paid upfront; it is offset against income/corporate tax at year-end but leaves today’s cash.
• Advertising: if you run Amazon ads (sponsored products), you should spread the spend per order and add it to the profit calculation.

Step-by-step profit calculation

Now let’s work out net profit with a concrete example. The amounts below are illustrative — the aim is to show the logic; for your own product be sure to get the fulfillment and storage fees from Seller Central’s FBA calculator. Example product: a small-standard size, fast-moving accessory.

In this example the seller’s rough mental math was probably “480 − 200 = 280 TL profit.” Once you deduct the items one by one, real gross profit drops to 140.60 TL — about half of what they thought. And we haven’t yet added the VAT offset and the ad share:

• VAT offset: the 80 TL VAT you collected isn’t your money, it belongs to the state; but you deduct the VAT on your purchase, commission, fulfillment and expense invoices from it. If your purchase and sale VAT rates are the same the difference stays small; if they differ (like buying at a low rate and selling at a high one) you should run the numbers with your own rates.
• Advertising: divide your monthly Amazon ad spend by your monthly order count and subtract this share too from the profit above. 3,000 TL of ads for 100 orders a month means 30 TL per order — in this example profit drops from 140.60 to 110.60 TL.

As a net formula: Net profit = sale price − referral − FBA fulfillment − storage share − withholding tax − product cost − inbound/return share − ad share − VAT difference. Instead of building this by hand for your own product, you can enter price, cost, category and size into the Amazon FBA calculator and see all the items on one screen. If you only care about the referral fee, the Amazon commission calculator will do the job too.

Who is FBA sensible for, and who not?

FBA is a convenience service and it doesn’t suit every product. When deciding, ask yourself three questions: is my product small/light, does it turn over fast, and is my margin wide enough to carry the FBA fees?

A practical approach: first test a new product with FBM, measure demand and return rate; once it starts selling regularly and you’ve confirmed it’s small/light, move it to FBA. And if you don’t want to stay dependent on a single marketplace, we covered the logic of positioning the same product across different platforms in our multi-marketplace sales strategy article; to see which platform is more profitable for your product, you can also look at the which marketplace is more profitable comparison.

Before you decide: don’t estimate, calculate

FBA’s appeal is the comfort of “let Amazon handle everything”; its trap is that the cost of that comfort comes from three separate places — referral, fulfillment and storage — and that these items, each looking small on its own, eat the margin in total. You can’t know whether a product is profitable in FBA without calculating it with that product’s real size/weight tier and real sales velocity.

Setting up the calculation in this article for your own product takes a few minutes: enter your sale price, cost, category and product size into the Amazon FBA calculator; let the referral, fulfillment and storage items be deducted, and also see the price you need to sell at to reach your target margin. For ongoing tracking there is Verimle: once you connect your marketplace accounts, it reads the real deductions of every order, distributes returns and ads per product on a per-sale basis, and sends you the “this product turned into a loss this month” alert before you notice it. Don’t estimate your profit; measure it.

A reminder: Amazon FBA fees — fulfillment, storage and processing items — change based on the product’s size-weight tier and the period (especially the last quarter of the year when warehouses fill up); the amounts in this article are only an example showing the logic and do not replace Amazon’s current official FBA fee schedule. Verify your own product’s exact fees via Amazon Seller Central or the Amazon Türkiye pricing page then enter these current amounts into the Amazon FBA calculator to see your net profit on one screen. This guide was reviewed on 18 July 2026.