Amazon Kept 38% of That Sale. You Kept $2.33.

Here's the full CPG accounting breakdown including referral fees, FBA, ads, returns so you can see what you keep on a $30 product.

You sold a $30 product on Amazon. Congrats. But wait…by the time Amazon is done with you, you might be keeping less than $8 of that sale. That is not a typo. That is CPG accounting in 2025.

Most founders know Amazon fees exist. Very few know exactly how much they stack. Referral fees, FBA fees, storage fees, ad spend, returns; each one feels small on its own. Together, they eat your margin alive. This article walks through every dollar on a real $30 product so you can see exactly where your money goes and what you actually keep.

The $30 Product: Setting the Scene

Let's use a clean example. Disclaimer: these are healthy numbers; many brands are running tighter.

Imagine you sell a $30 skincare product on Amazon. It weighs 8 oz, ships in a standard-size box, and you're running Sponsored Products ads to stay visible. Your COGS is $7.50. At this rate, you think you're just printing money.

You are not printing money.

Here's every fee Amazon charges you, line by line.

The Full Amazon Fee Breakdown on a $30 Sale

That's 46% of your gross revenue gone before you pay for a single unit of product.

Now Subtract Your COGS

Amazon fees are only half the story. You still have to make the thing.

A 28.8% gross margin sounds okay until you remember you haven't paid for your team, your 3PL prep costs, your agency, your software stack, or your founder salary. Those come next.

The Full Unit Economics Picture

This is where CPG accounting gets real. Gross profit is not the finish line. It's the starting line for your operating expenses.

At $1M in Amazon revenue, that 18.8% contribution margin means you're keeping roughly $188,000 to cover everything else. At $5M, it's $940,000. Sounds like a lot until your inventory is sitting in FBA for 90 days and Amazon just hit you with a long-term storage fee you forgot to model.

Breaking Down Each Fee (So Nothing Surprises You)

Referral Fees

Amazon charges a referral fee on every sale. The rate depends on your category. Beauty and personal care is 8% on the first $10.00 and 15% on anything above that. Grocery is 8%. Supplements and health products sit at 15%. If you're in a high-referral-fee category and your ASP is under $20, the math gets brutal fast.

The referral fee is calculated on the total sale price including any shipping you charge the customer. It's not negotiable. It's not avoidable. It's the cost of playing on Amazon's platform.

FBA Fulfillment Fees

FBA fees are based on the size tier and weight of your product. A standard-size item under 1 lb runs about $3.06 to $3.22 in 2025. Once you cross into large standard or oversize, fees jump fast. A 3 lb product in a large standard box can run $5.00 or more just for fulfillment.

These fees also change. Amazon adjusts them annually, usually in February. If you built your unit economics model in 2022 and never updated it, your numbers are wrong.

FBA Storage Fees

Storage fees are charged monthly per cubic foot. January through September runs about $0.78 per cubic foot. October through December, peak season, jumps to $2.40 per cubic foot. If your product sits in FBA for more than 365 days, you get hit with long-term storage fees on top of that.

For a small product, monthly storage might only be $0.30 to $0.50 per unit. But if you over-order inventory and it sits, those fees compound. Brands that send in 6 months of inventory to save on shipping often end up paying more in storage than they saved.

Amazon Advertising

This is the one that sneaks up on founders the most. Amazon ads are not optional anymore. Organic rank is real, but for most competitive categories, you need Sponsored Products running to stay visible. The average CPG brand on Amazon spends 10% to 20% of revenue on ads. Some spend more.

At 15% ad spend on a $30 product, you're spending $4.50 per unit just to get the click. Your ACoS might look fine at 30%, but your TACoS - total advertising cost of sale including organic should be your north star.

Model your ad spend as a percentage of total revenue, not simply ad-attributed revenue. That's the number that matters for CPG accounting.

Returns

Amazon's return policy is generous to customers and expensive for sellers. Return rates vary by category. Beauty and skincare typically runs 5% to 10%. When a customer returns a product, Amazon may restock it, mark it as unfulfillable, or dispose of it. You pay a returns processing fee. You may lose the product entirely. A 5% return rate on a $30 product costs you roughly $1.20 per unit sold when you factor in the lost product value and processing fees.

What You Keep

On a $30 sale, after referral fees, FBA fees, storage, ads, and returns, you net $16.13 from Amazon. After COGS of $7.50, your gross profit is $8.63. After a conservative SG&A allocation of $3.00, your contribution margin is $5.63 per unit.

That's 18.8 cents on every dollar of revenue.

Amazon took 46% of your gross revenue in fees. You spent 25% on product. You kept 18.8% to run your business.

Don't panic. Remember, brands that win on Amazon aren't the ones with the best product. They're the ones who understand their unit economics well enough to price correctly, manage inventory tightly, and make smart decisions about where to grow.

Why Most CPG Brands Get This Wrong

The most common mistake in CPG accounting is treating Amazon revenue like real revenue. It's not. Amazon revenue is gross revenue before a very long list of deductions. When founders look at their Seller Central dashboard and see $500,000 in sales, they feel good. When they look at their bank account, they feel confused.

The gap between gross Amazon revenue and what actually hits your bank account is where most CPG brands lose track of their business. You need a P&L that starts with net revenue after all Amazon fees, not gross sales. You need unit economics that include ad spend as a cost of sale, not a separate marketing line item. And you need to model returns as a real cost, not an afterthought.

If your financial model doesn't account for all of this, you're flying blind.

The Brands That Get It Right

The CPG brands that scale profitably on Amazon treat their unit economics like a living document. They update their fee assumptions every time Amazon changes its rate card. They track TACoS weekly, not monthly. They know their contribution margin by SKU, not just by channel. And they build their pricing strategy around what they need to keep, not what they hope to make.

That discipline is what separates a brand doing $5M on Amazon with 20% contribution margins from one doing $10M and losing money on every unit.

Frequently Asked Questions

What is the average total fee percentage Amazon charges CPG brands?

When you add referral fees, FBA fulfillment, storage, advertising, and returns, most CPG brands on Amazon are paying 35% to 50% of gross revenue back to Amazon in some form. The exact number depends on your category, product size, ad spend, and return rate. A beauty brand spending 15% on ads in a 15% referral fee category will hit the high end fast.

How do I calculate my real Amazon contribution margin?

Start with your gross selling price. Subtract referral fees, FBA fulfillment fees, storage fees, ad spend as a percentage of revenue, and a blended return cost. That gives you net revenue. Subtract COGS to get gross profit. Subtract any allocated overhead or SG&A to get contribution margin. That final number is what you actually keep per unit to run your business.

Are Amazon FBA fees the same for every product?

No. FBA fees are based on size tier and weight. A small standard item under 4 oz runs about $3.06. A large standard item between 2 and 3 lbs runs closer to $5.00. Oversize products can run $8.00 to $20.00 or more. If you have a heavy or bulky product, FBA economics may not work at your current price point.

Should Amazon ad spend be included in unit economics?

Yes, always. Ad spend is a cost of sale on Amazon, not a separate marketing expense. If you exclude it from your unit economics, your contribution margin is overstated. Model it as a percentage of total channel revenue using your TACoS, not your ACoS.

What is a healthy contribution margin for a CPG brand on Amazon?

Most healthy CPG brands target 20% to 30% contribution margin on Amazon after all fees, COGS, and ad spend. Below 15% and you have very little room for error. Above 30% and you have real pricing power or a very efficient supply chain. If you don't know yours, that's the first problem to fix.

Your Amazon P&L is not a mystery. It's math. And once you see the math clearly, you can actually do something about it.

If you want to stop guessing and start knowing your real unit economics, contribution margin, and cash flow across every channel, book a demo at irisfinance.co.