Amazon is the default first marketplace for most US sellers of physical products, for one simple reason: the buyers are already there, already searching, and already have a saved payment method. That built-in demand is real, but it comes bundled with commission fees, fulfillment fees, inventory rules, and a review and policy system that can shut your listing down over mistakes that look minor from the outside. This guide covers the decisions and numbers that actually determine whether selling on Amazon is profitable for a small business, not the general "how to start a store" advice that applies to any platform.
FBA vs. FBM: the first decision
Every Amazon seller chooses, per product, between two fulfillment models. Fulfillment by Amazon (FBA) means you ship inventory to Amazon's warehouses in bulk, and Amazon picks, packs, ships, and handles customer service and returns for each order. Fulfillment by Merchant (FBM) means you keep the inventory yourself and ship each order as it comes in, using your own process or a third-party fulfillment service.
FBA products are eligible for Prime shipping, which matters enormously for conversion — Prime shoppers filter for it and buy at a noticeably higher rate. The cost is Amazon's fulfillment and storage fees, plus the loss of hands-on control over how your product is packed and handled. FBM keeps more of each sale and gives you full control, but without Prime badging you're competing at a real disadvantage on anything where a Prime-eligible competitor also sells. Most sellers who commit to Amazon as a primary channel end up on FBA for their core products and use FBM selectively — for oversized items where FBA fees are punishing, or for slow-moving SKUs where storage fees would eat the margin.
What Amazon actually takes: the real fee math
The fee structure is the single most underestimated part of selling on Amazon. New sellers price against their cost of goods and forget that several fees stack before any profit is left. Rates below are representative ranges — Amazon updates its fee schedule periodically, so check Seller Central's current fee pages before pricing a product.
| Fee | What it covers | Typical range |
|---|---|---|
| Referral fee | Amazon's commission on every sale, charged per category | 8%–17% of item price (varies by category) |
| FBA fulfillment fee | Picking, packing, and shipping (FBA only) | A few dollars per unit, scaling with size and weight |
| Monthly storage fee | Warehouse space for FBA inventory | Charged per cubic foot; higher in Q4 (Oct–Dec) |
| Long-term storage fee | Inventory sitting in FBA warehouses too long | Additional surcharge after set aging thresholds |
| Seller plan fee | Professional selling plan subscription | Flat monthly fee, separate from per-item fees |
| Advertising (optional) | Sponsored Products and other PPC placements | Variable — you set the budget and bids |
Run the full stack against your actual cost of goods, packaging, and inbound shipping to FBA before you commit to a price. A product that looks profitable at a 40% gross margin before Amazon's cut can land at break-even or worse once referral fees, fulfillment fees, and a reasonable advertising budget are subtracted. Sellers who skip this step are the ones who discover, three months in, that they've been shipping product at a loss.
Choosing what to sell — and what to avoid starting with
The products that do best for new sellers share a few traits: they're small and light (fulfillment fees scale with dimensional weight), not easily breakable, not in a heavily gated category, and not dependent on being the cheapest option in a race-to-the-bottom niche already dominated by a handful of large sellers. Categories like groceries, supplements, and certain electronics require approval or documentation before you can list in them at all — check Amazon's category restrictions before sourcing inventory, not after it's already ordered.
Private-label (sourcing a generic product and branding it yourself) and wholesale (reselling an established brand's products) are the two most common models for small sellers. Private label gives you more margin and control but requires real product research and upfront inventory investment; wholesale is faster to start but usually means thinner margins and more direct price competition on the same listing.
Setting up your seller account and first listing
- Register for a Professional selling plan through Seller Central, which requires a business name, tax ID (EIN for most US businesses — see our guide to starting an online business in the USA for LLC and EIN basics), and bank account for payouts.
- Choose your fulfillment model per product, and if going FBA, create a shipping plan and send inventory to Amazon's designated fulfillment centers.
- Build the listing: title, bullet points, images, and backend search terms. Amazon's search ranks largely on relevance and sales velocity, so accurate, keyword-aware copy matters from day one.
- Set your price using the real fee math above, not just your cost of goods.
- Launch and monitor your first orders closely — this is when listing errors, missing compliance documents, or fulfillment mistakes surface.
Listing optimization: what actually moves rankings
Amazon's search algorithm weighs keyword relevance in the title and backend search terms, image quality, price competitiveness, and — heavily — conversion rate and sales history. A listing with great copy but poor photos will underperform a plainer listing with sharp, informative images, because shoppers judge instantly on the thumbnail and the first two or three photos. At minimum, include a clean white-background hero image (required by Amazon's image policy), lifestyle photos showing the product in use, and an image or infographic calling out key dimensions or features. Bullet points should answer the specific questions a buyer has before purchasing, not repeat marketing adjectives.
Amazon PPC: getting found inside Amazon's own search
Sponsored Products ads are how most sellers get initial traction on a new listing, since organic ranking is partly driven by sales history a brand-new listing doesn't have yet. Start with automatic targeting to let Amazon surface which search terms actually convert for your product, then layer in manual campaigns targeting the terms that perform. Track Advertising Cost of Sale (ACoS) — ad spend divided by ad-attributed revenue — against your margin from the fee table above; a 30% ACoS can still be profitable on a high-margin product and a loss on a thin one. Budget for a lower-margin launch phase while a new listing builds up reviews and organic sales history, then expect ad spend to do relatively less work once rankings stabilize.
Reviews: what's allowed and what gets accounts suspended
Reviews are one of the strongest conversion signals on Amazon, and also one of the areas with the strictest enforcement. Amazon's own Vine program (sending free units to vetted reviewers in exchange for an honest review) and simply following up with buyers through Amazon's request-a-review tool are both compliant ways to build review volume. What is not allowed, and routinely leads to listing removal or account suspension, includes offering refunds or payment in exchange for a positive review, review swapping with other sellers, or using any outside incentive tied to the content of the review. The rules change in detail over time, so check Amazon's current community guidelines before running any review-generation tactic, rather than relying on what worked a year ago.
Inventory and the IPI score
FBA sellers are evaluated on an Inventory Performance Index (IPI) score that factors in excess inventory, sell-through rate, and stranded or unfulfillable stock. A low IPI score can trigger storage limits on how much inventory you're allowed to send into FBA, which becomes a real constraint right when you most need to restock for a sales spike. Forecasting demand conservatively, avoiding over-ordering slow sellers, and clearing aged inventory before it triggers long-term storage fees all protect both your margin and your storage capacity. Stockouts are the other failure mode — losing the Buy Box or organic ranking during a stockout can take weeks to recover from after inventory is back, since Amazon's algorithm partly rewards consistent availability.
Sales tax, income tax, and the paperwork new sellers underestimate
Amazon collects and remits sales tax on your behalf in most US states under marketplace facilitator laws, which removes a large share of the sales tax burden that applies to sellers running their own independent store. That doesn't eliminate your tax obligations — you're still responsible for income tax on your profits, and depending on your business structure and where you hold inventory (including FBA warehouses, which can create nexus in additional states), you may have state-level filing requirements beyond what Amazon handles. This is a case where a short conversation with an accountant familiar with e-commerce is worth more than guessing; our guide to starting an online business in the USA covers the broader LLC, EIN, and nexus basics that apply whether you sell through Amazon or your own store.
Why most serious sellers don't stop at Amazon
Amazon is excellent for discovery and terrible for owning the customer relationship — you don't get buyer emails, you can't easily remarket, and a policy change or suspension can remove your revenue overnight with limited recourse. Sellers who build real staying power typically use Amazon for volume and cash flow while building an owned channel (their own store, an email list, a social following) in parallel, the same logic that applies to marketplace sellers in any country. Treat Amazon as one channel in a portfolio, not the entire business, from the start.
Common mistakes to avoid
- Pricing against cost of goods only, ignoring referral fees, fulfillment fees, and advertising spend until after launch.
- Launching in a gated or restricted category without checking approval requirements first, then holding inventory you can't list.
- Incentivizing reviews in ways that violate Amazon's policies, risking account suspension over a handful of reviews.
- Over-ordering inventory based on a single strong sales week, then getting hit with long-term storage fees and a lower IPI score.
- Treating Amazon as the entire business instead of one channel, leaving no backup if a listing or account is suspended.
Conclusion
Amazon gives US small businesses access to a massive, ready-to-buy audience, but the fee structure, fulfillment choices, and policy enforcement determine whether that access turns into real profit. Run the full fee math before pricing anything, respect the inventory and review rules closely enough to avoid suspension, and build toward owning at least one channel outside Amazon so the business doesn't depend entirely on a platform you don't control.