Amazon Repricing: How to Stop Selling at a Loss and Fix Your Minimum Prices
You might be selling at a loss right now. Not on your worst SKUs, you know those are thin. On the ones your dashboard calls your best performers. The high-volume lines, the ones with 800 reviews and a Buy Box win rate that looks excellent from every angle.
The tell is in the Payments report, not the Orders report. Orders measure revenue. Payments measure what actually left Amazon's hands and arrived in yours, after every fee. And there is a second problem that catches sellers every autumn: a floor that was correct in September stops being correct on 15 October, because three of its inputs change at once.
TL;DR
A floor calculated on off-peak costs is wrong by roughly 60 cents a unit from mid-October, and most floors are already wrong before peak season touches them. This guide runs the full calculation from unit cost to correct floor, with every input labelled, then runs it again at peak rates so you can see which components move. In the worked example below the off-peak floor is $19.55 and the peak floor is $20.14. Three things change between October and mid-January: monthly storage roughly triples, fulfilment fees step up for the holiday window, and the 3.5% fuel and logistics surcharge applies to the higher fee. Cost-calculated floors handle all three without you remembering to.
How Amazon Sellers End Up Selling Below Cost
The most common cause of selling below cost is a floor set as a round number rather than a calculated one.
A seller works out their costs approximately, decides that landed cost is about $9 and fees are roughly $5, so $14 feels safe, and types $14.00 into the minimum price field. The problem is that "roughly $5 in fees" is nothing of the sort once inbound shipping, the returns provision, the current fulfilment fee tier and the surcharge on top of it are all counted. The floor is wrong from the day it is entered, and it stays wrong silently.
In Jungle Scout's seller survey, 13% of small and midsize Amazon sellers said their business was not yet profitable, against an average profit margin of 21% across that same group. Those figures come from a survey fielded over December 2023 and January 2024, so read them as a direction rather than a current reading. The sellers sitting below zero are rarely the ones sourcing badly. They are the ones pricing against costs that stopped being correct.
The pressure is not imagined. Marketplace Pulse records active Amazon sellers falling from 2.4 million in 2021 to 1.65 million by the end of 2025, across a period it calls the Great Compression, when fee increases, ad costs and competition squeezed margins at the same time. Sellers who did not make it through were not all badly capitalised. Many were priced correctly against costs that had quietly stopped being correct.
Sellers say the same thing in their own reviews. A retail seller writing on Capterra in December 2021 described the value of the tool in terms of keeping his margins, in his words, "in the black" rather than letting them slip under. An automotive seller with an 11 to 50 person business, reviewing in February 2018, reported something more pointed: once prices were being managed properly she found products she had been underpricing, and correcting them made the business money she had been leaving on the table. Both reviews are several years old, and neither mentions floor prices by name, but the pattern underneath them is the one this guide is about.
Five ways sellers end up below cost without noticing:
The typed floor. A flat dollar number entered once and never recalculated. It works until any input changes, and something changes every year.
The fee-increase blind spot. Amazon raised FBA fulfilment fees by an average of $0.08 a unit on 15 January 2026, with small items in the $10 to $50 band taking $0.25, then added a 3.5% fuel and logistics surcharge to every US and Canadian fulfilment fee from 17 April 2026. A floor set in December 2025 has been wrong twice over since.
The missing returns provision. Returns cost you the fulfilment fee, which Amazon does not refund, plus return processing, plus disposal or repackaging. In apparel that can reach 15 to 20% of revenue. A floor without a returns line assumes everything sells cleanly.
The referral fee miscalculation. The referral fee is a percentage of the selling price, not of profit, so it moves whenever your price moves. Worse, sellers routinely apply the wrong category rate. Amazon publishes the full schedule on its public referral fee table, where Home and Kitchen, Tools and Home Improvement and Office Products all sit at 15%, while 8% belongs to a narrower set of categories. Getting that wrong on a $20 item is a $1.40 error per unit, every unit.
The DIM weight trap. Amazon charges on the greater of actual or dimensional weight. A product weighing 1.5 lb in a 12 by 10 by 8 inch box has a dimensional weight of 6.9 lb under the 139 divisor. Using the number on the product label rather than the shipping box puts the fulfilment fee out by a dollar or more.
The Complete Cost Stack: Every Fee That Belongs in Your Minimum
Your minimum price has to account for every cost between you and the customer, or it is not a real minimum.
The full stack is landed cost, fulfilment fee, the fuel and logistics surcharge on that fee, referral fee, inbound shipping per unit, returns provision, storage, and your target margin. The three most commonly left out are the returns provision, inbound shipping per unit, and the dimensional weight uplift on the fulfilment fee. The surcharge is now a fourth, because it arrived mid-2026 and most floors predate it.
The referral fee deserves its own note. Most sellers know their headline category rate, but two details catch people. Amazon charges a minimum referral fee of $0.30 per transaction, which matters on anything under about $2. And the rate itself varies more than sellers expect. For the current schedule by category, the Amazon seller fees guide covers the full breakdown including the non-standard rates.
Calculating Your True Break-Even Minimum Price
Run this for each SKU. The answer tells you whether your current floor is correct.
Step 1: Total your true landed cost. Purchase price per unit from the supplier invoice, plus inbound freight divided by units, plus duties and customs brokerage if they apply, plus inspection and prep fees. This is not your supplier's unit price. It is the total cost of getting one unit to an Amazon fulfilment centre.
Step 2: Look up the exact fulfilment fee. Use the dimensions and weight of the shipping box, not the product. Dimensional weight is length times width times height divided by 139, and the fee is based on whichever is greater. Find the tier in Seller Central under Fulfilment by Amazon, then Fee Schedule. Note which price band you are in, because standard-size fees differ for items under $10, between $10 and $50, and over $50.
Step 3: Add the fuel and logistics surcharge. Multiply the fulfilment fee by 1.035. The surcharge applies to fulfilment fees only, not to storage and not to the referral fee.
Step 4: Add inbound shipping, returns provision and storage. Inbound shipping is the freight cost of your most recent shipment divided by units. The returns provision is your category return rate times the fulfilment fee plus return processing, or 2.5% of selling price as a simpler approximation. Storage is the monthly rate times your product's cubic feet times the average months it sits in FBA before selling.
Step 5: Solve for the floor in one pass. Both the referral fee and the returns provision are percentages of the selling price, so put them in the denominator rather than guessing at a price and iterating:
Minimum price = (landed cost + fulfilment fee with surcharge + inbound + storage + target margin) ÷ (1 − referral rate − returns rate)
That single formula removes the estimate-then-refine loop. Everything that scales with price sits on the bottom, everything fixed sits on top.
What Changes Between 15 October and 14 January
Three inputs in that formula move for peak season, and they do not move on the same dates.
The date mismatch is the part that trips people up. Storage reverts to the off-peak rate in January while the holiday fulfilment rates run to 14 January, so the two are only aligned for part of the window. The surcharge is not a peak charge at all, it simply scales with whatever the fulfilment fee happens to be, so it quietly amplifies the peak increase.
Storage is the component that moves most in percentage terms, roughly tripling, but it is usually the smallest line in the stack, so the fulfilment step-up tends to cost more in absolute cents. The combined effect in the example below is about 60 cents a unit. That is small per unit and considerable per quarter: at 200 units a day across the 92-day window it is roughly $11,000.
Peak is also when your competitive set changes, which is a separate problem from your floor. The Q4 repricing settings guide covers the rule changes that go alongside the recalculated floor.
A Worked Example: Off-Peak Floor and Peak Floor
The example below states every input, including the ones usually left implicit, so the arithmetic can be followed and checked.
The product: a household storage item, large standard size, 4 oz or less shipping weight, 0.15 cubic feet, selling in the $10 to $50 price band, averaging one month in FBA before it sells.
Off-peak floor = $16.13 ÷ (1 − 0.15 − 0.025) = $16.13 ÷ 0.825 = $19.55
Peak floor = $16.62 ÷ (1 − 0.15 − 0.025) = $16.62 ÷ 0.825 = $20.14
At the off-peak floor the referral fee works out at $2.93 and the returns provision at $0.49. At the peak floor they are $3.02 and $0.50. Both are consequences of the price, which is why they belong in the denominator rather than being estimated up front.
Where the 59 cent difference comes from:
Storage, plus 29 cents. The rate triples but the line is small, so the effect is modest.
Fulfilment fee, plus 30 cents. A 24 cent step-up on the fee itself, which then gets marked up by the surcharge and by the referral and returns percentages as the floor rises.
The honest headline is not the peak gap. It is that a seller holding a floor anywhere near $17 on this product is below break-even all year, and roughly 60 cents further below it from mid-October. If this seller's floor is $14.00, a common number that felt safe, they are losing $5.55 on every unit sold at floor off-peak. At 200 units a day that is $1,110 a day.
Good news: finding this is the hardest part. Fixing it takes less than an hour.
Uploading Your Corrected Minimum Prices to Your Repricer
Once you have the correct floor for each affected SKU, update your repricer before the next sale.
For a single ASIN, update the minimum price field directly in your repricer's product settings. It takes about 90 seconds. Do it now if you already know your correct floor and your current one is wrong.
For 10 or more SKUs, use a bulk upload. In Repricer, export a CSV of current settings from your product list, update the minimum price column with the corrected floors, and reimport. At catalogue scale this is the only practical route.
After updating, check three things:
Does the minimum field show the new number? Open the ASIN and confirm it saved.
Is the live price now below the new floor? If the repricer has been pricing under the corrected minimum, you may need to raise the price manually before normal operation resumes.
Is any active rule trying to price below the new floor? A price war rule or a clearance rule set aggressively will conflict with a corrected floor. Resolve that before going live, or the rule will keep fighting the floor.
If you are doing this in October, do it once with peak numbers rather than twice. Recalculating on 15 October and again on 15 January is two jobs; setting cost-calculated floors is none.
How Cost-Calculated Floors Stop This Recurring
The reason this problem keeps happening is that typed floors go stale, and the solution is floors that calculate rather than store.
A flat minimum price is a guess about the future. It is correct on the day you work it out and silently wrong from the moment any input moves. In 2026 alone, two inputs moved for every standard-size FBA seller in the US: the January fee increase and the April surcharge. Peak season moves two more every October.
Profit Protection is Repricer's version of this. Repricer describes it as making sure your products never sell below their associated costs, and it rests on the net margin repricing approach: you enter your costs and the system sells only at your target profit margin, rather than holding a number you typed months ago. Confirm the exact input list when you configure it, because a calculated floor is only as good as the costs you feed it.
Three cases where a calculated floor earns its keep:
A fee changes. A floor derived from fee inputs moves when those inputs move. A typed one does not, and nobody gets an alert.
Your supplier raises prices. Update the landed cost once and every ASIN sharing that cost moves together.
Peak season arrives. Storage and fulfilment both step up in October, and a derived floor absorbs that without a catalogue-wide CSV job in your busiest month.
For how the margin calculation works across channels, the net margin guide covers every cost component including the ones that only apply on Amazon.
On the question of whether it is safe to let software move your prices at all, Repricer states on its pricing page that it is compliant with Amazon's rules and guidelines, is a member of the Amazon Marketplace Developer Council and an Amazon Web Services Technology Partner, and works with Amazon directly as the platform changes. Those are checkable affiliations rather than reassurance, which is the right standard to hold any tool to before it touches your prices.
The Retrospective: What the Wrong Floor Cost You
Run this after fixing the floor, not before. It is useful for financial planning and useless for making yourself feel bad.
For each affected ASIN: daily unit sales multiplied by the gap between the correct and the wrong minimum, multiplied by the number of days the floor was wrong.
Using the worked example, a seller whose floor sat at $17.26 against a correct off-peak floor of $19.55 carried a gap of $2.29. At 150 units a day over 90 days that is $30,915 of margin that was never there. The same seller entering peak season without recalculating adds a further 59 cents a unit on top.
The historical loss is sunk. It is worth calculating for two reasons only: restating the quarter honestly, and understanding why the floor has to stay accurate rather than be accurate once.
Key Takeaways
Sellers who lose money are usually mispriced, not badly sourced. The most common cause is a floor that does not carry every cost Amazon charges.
The stack is landed cost, fulfilment fee, the 3.5% surcharge on that fee, referral, inbound, returns, storage and margin. Leave one out and the floor is wrong.
Put the percentages in the denominator. Referral and returns both scale with price, so solving in one pass is more accurate than estimating a price and refining.
Three inputs change for peak and they change on different dates. Storage October to December, fulfilment fees 15 October to 14 January, surcharge always.
In the worked example the floor moves from $19.55 to $20.14 for peak, about 60 cents a unit, or roughly $11,000 across the window at 200 units a day.
The bigger error is usually the off-peak floor itself. Check the referral rate you are applying, because 8% belongs to a few categories and most general merchandise is 15%.
Cost-calculated floors remove the annual scramble. Enter the inputs once and the floor follows every fee change on its own.
Action Plan
Pull the Payments report for your top 10 ASINs and divide by units. Any ASIN where the per-unit payout is near or below your expected break-even goes to the top of the list.
Confirm the referral rate you are using for each one. This is the single most likely place a floor is wrong by more than a dollar.
Run the five-step calculation with the real fee tier from Seller Central, your real landed cost, the correct dimensional weight, and the 3.5% surcharge applied to the fulfilment fee.
Run it twice if you are reading this between October and mid-January, once at standard rates and once at peak rates, and use the peak figure until the rates revert.
Update the minimum price for any ASIN where the gap is more than $0.10. Single ASIN directly, multiple by bulk CSV.
Check for rule conflicts before going live, so no active rule is trying to price under the corrected floor.
Switch to cost-calculated floors so the next fee change, and the next peak season, do not need a catalogue-wide job.
Frequently Asked Questions
1. How do I know if I am selling at a loss on Amazon?
Compare your Orders report against your Payments report for the same period and divide each by units. Orders shows gross revenue, Payments shows what Amazon actually transferred after fees. If the per-unit Payments figure is below your landed cost plus fulfilment fee, those SKUs are losing money. The full five-step calculation is the precise version, because the two-report comparison can still miss storage and the returns provision.
2. How do I calculate my Amazon break-even price?
Break-even equals landed cost plus the fulfilment fee including its 3.5% surcharge, plus inbound shipping, returns provision and storage, all divided by one minus the referral rate minus the returns rate. Fixed costs go on top, anything that scales with the selling price goes in the denominator. For a target margin, add the margin in dollars to the numerator before dividing.
3. Does my minimum price need to change for peak season?
Yes, and by more than most sellers expect. Monthly storage for standard-size inventory goes from $0.78 to $2.40 per cubic foot across October to December, and holiday fulfilment rates apply from 15 October to 14 January. In the worked example above that moves the floor from $19.55 to $20.14. Recalculate in early October and again when the rates revert, or use cost-calculated floors so it happens by itself.
4. Does the 3.5% fuel surcharge apply to everything?
No. It applies to FBA fulfilment fees in the US and Canada, calculated on the fee rather than on the sale price, and it has been in effect since 17 April 2026. It does not apply to monthly storage fees and it does not apply to referral fees. Multiply only the fulfilment fee by 1.035 when you build your floor.
5. Why does my floor keep becoming wrong?
Because it is stored as a typed number rather than calculated from inputs. A typed floor is a snapshot of your costs on the day you entered it. Amazon's fee changes, the arrival of the surcharge, supplier price moves and the October peak rates all change the real break-even without touching the number in your repricer. Floors calculated from live cost inputs solve it permanently.
