How Amazon FBA Fee Changes Make Automated Repricing Non-Negotiable

Amazon raised FBA fees on 15 January 2026 by an average of $0.08 a unit. Modest enough to dismiss, and most sellers did. The bigger problem is that the January change was not the only one. Fees moved again in April, and they move again every October without any announcement at all, because the holiday peak rates are already scheduled.

A seller who treats January as the annual fee event has their floor wrong for roughly three months of every year, and those three months are the ones carrying the most volume.

TL;DR

Amazon's fee schedule moved three times in 2026, and a floor reviewed once a year catches one of them. January brought an average $0.08 per unit rise, ranging from no change to $0.51 depending on size and price band. April added a 3.5% fuel and logistics surcharge calculated on the fulfilment fee. Then on 15 October the holiday peak rates took over until 14 January, adding an average of $0.32 a unit on top of everything else, while Q4 storage runs at roughly three times the off-peak rate. A typed minimum price absorbed all three silently. The fix is a floor derived from live cost inputs, and a review cadence of twice a year rather than once.

What Changed in Amazon's January 2026 Fee Structure

Amazon raised FBA fulfilment fees effective 15 January 2026, and the headline average of $0.08 per unit describes almost no actual seller.

Amazon's own announcement to selling partners, published 15 October 2025, puts the rise at an average of $0.08 per unit sold, or less than 0.5% of an average item's selling price. The spread underneath that average is what matters, and Supply Chain Dive published the full table from Amazon's fee schedule:

The range runs from nothing to 0.51.Asellerreading"0.08 on average" and deciding it was not worth acting on could have been absorbing more than six times that.

Two other changes landed at the same time. Multi-Channel Fulfilment fees rose by an average of $0.30 per unit. Amazon Warehousing and Distribution storage in the West region went from $0.48 to $0.57 per cubic foot per month, a rise of about 19%, while other regions held at $0.48. Referral percentages were not changed in 2026, though Amazon's own letter quantifies only the FBA side, so that detail comes from trade coverage rather than from Amazon directly.

Amazon's letter states plainly that sellers get at least 90 days before any fee increase takes effect. From the 15 October 2025 announcement to the 15 January 2026 effective date is 92 days. That window is the one most sellers did not use.

For scale, Modern Retail reports Amazon earned more than $150 billion in revenue from seller fees in 2024, up 7% on the year before. Small per-unit movements across a base that size are not small.

The Two Changes That Came After January

Most coverage of 2026 fees stops at January. Two further changes landed after it, and neither was an annual schedule update.

April: the fuel and logistics surcharge. From 17 April 2026, Amazon applied a 3.5% fuel and logistics-related surcharge to FBA fulfilment services for third-party sellers in the US and Canada, along with Remote Fulfilment from the US into Canada, Mexico and Brazil. Retail Dive reports that it is calculated on the seller's fulfilment fees rather than on the sale price of the item. From 2 May 2026 it extended to Buy with Prime and Multi-Channel Fulfilment. On a $5.00 fulfilment fee it adds roughly $0.18.

The practical point is that it is a multiplier, not a flat charge. It scales with whatever your fulfilment fee happens to be, which means it quietly amplifies every other increase, including the peak rates below.

October: the holiday peak rates. These are not announced as a fee change because they are a scheduled seasonal rate card, which is exactly why they get missed. They are covered in the next section.

Neither of these appears in a January floor review. A seller who did their annual recalculation in December 2025 and has not touched it since has been wrong since April, and more wrong since 15 October.

What the October to January Peak Window Costs

US holiday peak fulfilment rates run from 15 October 2026 to 14 January 2027, adding an average of about $0.32 per unit over standard rates.

That average is unchanged from the previous holiday season, so the uplift itself did not grow for 2026. What grew was the base it sits on, because January's increase and April's surcharge both feed into it. Reported figures put the per-unit uplift somewhere between $0.19 and $2.81 depending on size tier, so as with the January change the average is a poor guide to any individual SKU. Amazon does not publish the peak rate card publicly, so check your own tier in Seller Central rather than working from the average.

Storage moves on a different clock. Standard-size monthly inventory storage runs at $0.78 per cubic foot from January to September and $2.40 from October to December, roughly tripling for the quarter.

The two windows do not line up, and that is the trap. Storage reverts on 1 January while holiday fulfilment rates run to 14 January. A seller who recalculates once on 1 January is carrying the wrong fulfilment fee for a fortnight, during the returns-heavy period when they can least afford to be wrong about margin.

Peak also changes who you are competing against, which is a separate job from fixing the floor. The Q4 repricing settings guide covers the rule changes that belong alongside the recalculation.

Recalculating Your Minimum After a Fee Change

The formula does not change when fees change. The inputs do, and the floor moves by more than the fee did.

Put every cost that scales with the selling price into the denominator, and everything fixed on top:

Minimum price = (landed cost + fulfilment fee including its 3.5% surcharge + inbound shipping + storage + target margin) ÷ (1 − referral rate − returns rate)

Storage belongs in that stack. It is a small line for most of the year and a materially larger one from October, which is precisely why a formula that omits it reads fine in June and fails in Q4.

The part sellers get wrong. A fee rise of $0.08 does not raise your floor by $0.08. Because the referral fee is a percentage of the selling price, raising the price to cover a cost also raises the referral fee you pay on it. Taking the referral effect alone at an 8% rate, a $0.08 fee increase raises the correct floor by $0.08 ÷ 0.92, which is $0.09. Carry a returns provision as a percentage of price too and the divisor shrinks again, so the real gap is a little wider still.

Worked at the top of the January range, the $0.51 increase on small items above $50 raises the floor by $0.51 ÷ 0.92, which is $0.55 on the referral effect alone, or $0.57 once a 2.5% returns provision goes into the same denominator. At 500 units a day, the conservative $0.55 figure is $275 a day, $8,250 a month and $100,375 a year on a single SKU, against an increase that never appeared as a warning anywhere.

To find the correct fee for your own product, pull the Fee Preview report in Seller Central under Reports, then Fulfilment by Amazon, or use the Revenue Calculator, which reads the live fee for your actual size and weight tier. Referral rates for your category are published on Amazon's public referral fee table.

Updating Your Floor Prices in Your Repricer

Once you have the correct minimum for each affected SKU, update it before the next sale. Every sale below a corrected floor is a loss you have already identified.

1. Identify affected SKUs. Download the Fee Preview report and compare the current fulfilment fee per ASIN against the figure your floors were calculated from. Anything that moved is affected.

2. Recalculate. Apply the formula with the new fee, the surcharge, and the peak storage rate if you are inside the October to December window.

3. Update the minimum price field. Individually in the product settings for one ASIN, or by CSV export, edit and reimport for a catalogue.

4. Verify the floor holds. If the repricer was already sitting at the old floor, your live price is now below the corrected one and needs raising manually before automated repricing resumes.

5. Check for rule conflicts. A price war rule or a clearance rule set aggressively will keep pushing against the new floor. Resolve that before going live.

Why a Cost-Calculated Floor Survives All Three

A floor derived from cost inputs moves when the inputs move. A typed floor does not, and nothing alerts you.

This is a different argument for automation than the usual one. It is not about being faster than competitors to the Buy Box. It is about the baseline those moves are measured against. A repricer executing perfectly against an incorrect floor is losing margin on every sale it wins, and its Buy Box statistics will look excellent throughout.

Profit Protection is Repricer's version of a calculated floor. Repricer describes it as ensuring products never sell below their associated costs, built on the net margin repricing approach where you enter your costs and the system holds your target profit margin rather than a number you typed. Confirm the exact input list when you configure it, because a calculated floor is only ever as accurate as the costs behind it.

One seller review on Capterra makes the same point from the other direction: the reviewer notes that a genuine per-SKU net profit figure only appears once every relevant cost has been entered into the system, rather than revenue being mistaken for profit. That is the whole dependency in one sentence.

On whether it is safe to let software move 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.

For every fee component that belongs in the stack, the Amazon seller fees guide covers the full methodology.

The Twice-Yearly Review Cadence

One annual review in December catches the January change and misses everything else. Two reviews catch all of it.

The old advice was to treat December as the window, on the logic that Amazon announces in Q4 and changes take effect in January. That holds for the annual schedule update and fails for the other two thirds of the year's fee movement. A December review happens two months after peak rates took effect and eight months after the surcharge arrived.

Review one: late September or the first week of October. Recalculate with the holiday fulfilment rates and the Q4 storage rate before 15 October, not after. This is the review that was missing, and it covers the highest-volume quarter.

Review two: December or early January. Recalculate against the new annual rate card, which Amazon will have announced in October with at least 90 days' notice. Hold the peak fulfilment rate in the calculation until 14 January, then run the standard rates.

Two habits make both reviews cheap:

1. Read the Seller Central fee announcement when it lands, rather than when the change takes effect. Amazon's 2026 announcement gave 92 days. A seller who acted in October 2025 had correct floors on day one.

2. Move off typed floors. The repricing rules guide covers the design principles for configurations that survive input changes. Floors derived from inputs update on their own; typed floors need both reviews to be done by hand, every year, forever.

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Key Takeaways

1. Fees moved three times in 2026, not once. January's rate card, April's 3.5% surcharge, and October's holiday peak rates.

2. The January average of $0.08 described almost nobody. The real range was no change to $0.51 per unit depending on size tier and price band.

3. A fee rise raises your floor by more than the fee. At an 8% referral rate, $0.08 becomes $0.09 and $0.51 becomes $0.55, because the referral fee scales with the price you raise.

4. The peak uplift averages about $0.32 a unit, unchanged from last season, across a base that January and April both raised. Reported per-tier figures span $0.19 to $2.81.

5. Storage roughly triples in Q4, from $0.78 to $2.40 per cubic foot for standard size, and it belongs inside the floor formula.

6. The two peak windows do not align. Storage reverts on 1 January, fulfilment rates on 15 January.

7. Review floors twice a year, in early October and again in December or early January. One annual review structurally cannot catch peak.

Action Plan

1. Download the Fee Preview report from Seller Central and compare the live fulfilment fee per ASIN against the figure your current floors were built on.

2. Add the 3.5% surcharge to the fulfilment fee in every floor calculation. If your floors predate 17 April 2026, none of them carry it.

3. Apply the peak storage rate of $2.40 per cubic foot for any floor you are calculating between October and December.

4. Recalculate using the denominator method so the referral and returns percentages are handled correctly rather than estimated.

5. Update every ASIN where the gap exceeds $0.10, individually or by bulk CSV, and verify no live price now sits below its corrected floor.

6. Diary the next two reviews now: one for the first week of October, one for late December.

7. Switch to cost-calculated floors so the next rate card change does not need a catalogue-wide job at all.

Frequently Asked Questions

1. What changed in Amazon's FBA fees in 2026?

Three separate things. Fulfilment fees rose an average of $0.08 per unit on 15 January 2026, ranging from no change for large items under $10 up to $0.51 for small items above $50. A 3.5% fuel and logistics-related surcharge on fulfilment fees followed on 17 April, extending to Buy with Prime and Multi-Channel Fulfilment on 2 May. Then holiday peak fulfilment rates took effect on 15 October and run to 14 January. Multi-Channel Fulfilment also rose about $0.30 per unit in January, and Amazon Warehousing and Distribution storage in the West region went from $0.48 to $0.57 per cubic foot.

2. How much notice does Amazon give before a fee change?

Amazon's own announcement states that sellers get at least 90 days before any fee increase takes effect. The 2026 change was announced on 15 October 2025 and took effect on 15 January 2026, which is 92 days. Holiday peak rates are different: they are a scheduled seasonal rate card rather than an announced fee change, which is why they are the ones sellers most often miss.

3. Does the 3.5% surcharge apply to my whole Amazon bill?

No. It is calculated on fulfilment fees rather than on the sale price of the item, and on a $5.00 fulfilment fee it adds roughly $0.18. Because it is a percentage of the fee, it rises whenever the underlying fulfilment fee rises, including during the holiday peak window. Check your own Fee Preview report to see how it lands on your tiers rather than assuming a flat amount.

4. When should I review my minimum prices?

Twice a year. Once in late September or the first week of October, so your floors carry the holiday fulfilment rates and the Q4 storage rate before 15 October. Once in December or early January, against the new annual rate card. Recalculate immediately after any fee announcement as well, rather than waiting for the next scheduled review.

5. Why does a fee increase raise my floor by more than the increase?

Because the referral fee is a percentage of the selling price. When you raise your price to cover a higher fulfilment fee, Amazon's referral fee on that higher price rises too, so part of the increase is eaten before it reaches your margin. At an 8% referral rate the referral effect alone means dividing the fee increase by 0.92, which turns $0.08 into $0.09 and $0.51 into $0.55. Put your returns provision into the same denominator and the gap widens again. Adding the raw fee increase to your floor leaves you short every time.