Amazon FBA Restock Limit and Capacity Limits (2026): Your Maximum Inventory Level and How to Raise It

The thing most sellers still call the Amazon FBA restock limit has not existed under that name since 1 March 2023. Amazon replaced it with a single monthly FBA capacity limit per storage type, measured in cubic feet rather than units and announced in the Capacity Monitor each month. Your practical maximum inventory level is that cubic-foot limit minus what you already hold and what is already inbound, and there are four routes to move it: Capacity Manager, Amazon Warehousing and Distribution, shrinking the volume each unit consumes, and raising your IPI over time.

One boundary first: your IPI score is the account metric that feeds this limit — this page is about the limit itself, when it lands and what moves it.

The Vocabulary Ledger: What Each Old Term Means Now

Search results for “restock limit” mix four generations of policy. Here is what Amazon’s own dated announcements say, all read logged out on 2026-08-02.

Two of those rows are where most 2026 advice goes wrong.

“Maximum inventory level” is a display, not the constraint. Capacity limits are measured “in cubic feet (vs. number of units), which better represents the capacity sellers’ products use in our fulfillment centers and transportation vehicles” (sell.amazon.com, checked 2026-08-02). The unit figure on the dashboard is derived: when your product mix changes shape it moves without your limit changing at all.

The overage fee is gone. Guides still quoting a per-cubic-foot overage rate are quoting the March 2023 announcement — which did say “overage fees will apply if your on-hand inventory in Amazon’s fulfillment centers, not including open shipments, exceeds your capacity limit” — without noticing it was withdrawn 16 months later. A tight limit now blocks the shipment rather than generating a fee — per Jameson_Amazon, “you will not be able to create a new shipment until your inventory level drops below your limit” (Seller Forums, checked 2026-08-03).

How the Number Is Set — and Which Inputs You Control

Amazon publishes the input list and nothing about the weighting:

“FBA capacity limits are influenced by sellers’ IPI scores, as well as other factors such as sales forecasts for their ASINs, shipment lead time, and fulfillment center capacity.” — sell.amazon.com, checked 2026-08-02

Read that as a control map. IPI is yours to move, slowly; sales forecasts are Amazon’s model, fed by your history; lead time is partly yours. Fulfillment center capacity sits entirely outside your account, and is why limits get cut in a quarter when nothing about your business changed.

Whether you get a limit at all depends on the account, per the Dominic_Amazon staff account on the Seller Forums (read logged out 2026-08-02):

Source: Refresher: FBA Capacity Limits & How They Work, Seller Forums.

The 15-cubic-foot line is a hard ceiling, not a starting point, and the only exit is upgrading the plan — see Individual vs Professional selling plans. The 39-week window is the opposite trap: a new professional account runs uncapped, and its first limit is calculated from habits formed while nobody was counting.

What counts against the limit. Per Dominic_Amazon: “Usage against your FBA capacity limits will consider your inventory on-hand at Amazon and open shipments on the way to our fulfillment centers, calculated in cubic feet.” Inbound stock consumes headroom from the moment you create the shipment.

The Calendar That Actually Binds You

Timing, not arithmetic, is what makes capacity limits painful for importers.

• They land late. “Capacity limits for the upcoming month will be announced in the third full week of each month via the Capacity Monitor in Seller Central and an email notification” (sell.amazon.com, checked 2026-08-02).
• The forward view is hedged. Amazon provides “estimated limits for the following two months to help you plan,” then warns that “Estimates may vary up or down” with your IPI score and “how much space and labor we have available to support you” (Seller Forums, checked 2026-08-02).
• Where to read it. The Capacity Monitor sits “at the bottom of the FBA dashboard,” where “The table on the right displays your estimated capacity limits for the next three months” (Dominic_Amazon, 2026-08-02).

Put a lead time against that. A seller importing on a 90-day cycle places the PO for November arrival in roughly August; the confirmed November limit appears in the third full week of October. The estimate — which Amazon states may move down — is all you have for the decision that costs real money. Capacity planning therefore belongs in the purchasing calendar, doubly so in Q4, where the Q4 preparation checklist covers the deadlines stacked on top.

Four Ways to Raise Your Maximum Inventory Level

1. Buy capacity through Capacity Manager

The only lever that works within a single month, run as a sealed-bid allocation: “you can request additional capacity based on a reservation fee that you specify. Requests are granted objectively, starting with the highest reservation fee per cubic foot until all capacity available under this program has been allocated” (Seller Forums, checked 2026-08-02).

Per Dominic_Amazon: state how much extra capacity you want and when, set your maximum reservation fee, and “We’ll assess fulfillment center capacity regularly (typically twice per week) and grant requests as capacity is available.”

The fee is refundable in effect if the goods move: “Performance credits earned from the sales generated using the extra capacity can offset up to 100% of the reservation fee” (News_Amazon, checked 2026-08-02). Amazon’s framing is conditional — “so you don’t pay for the capacity as long as your products sell through” (Seller Forums, checked 2026-08-02). Reserved space that does not sell through is paid for twice. Bid on fast movers, never on the tail.

2. Hold inventory upstream in AWD

AWD changes the denominator instead of the limit: “inventory that’s auto-replenished from AWD doesn’t count towards your Fulfillment by Amazon (FBA) capacity limits” (News_Amazon, checked 2026-08-02) — which holds “if you leave auto-replenishment enabled” (sell.amazon.com, checked 2026-08-02).

Two constraints decide whether the route is open to you:

• Size eligibility narrowed in 2026. The KJ_Amazon staff account states: “Starting July 31, 2026, AWD only accepts sortable items (smaller than 18” x 14" x 8" and weighing less than 20 lbs)" (Seller Forums, checked 2026-08-02). Oversize sellers — whose cubic feet run out first — are exactly who this now excludes.
• It is one-directional. Amazon’s program FAQ states you cannot move inventory from FBA to AWD, “because items are stored differently in our fulfillment and distribution centers” (sell.amazon.com, checked 2026-08-02). AWD is a decision made at the port, not a release valve pulled when the Capacity Monitor turns red.

Routing, fees and replenishment are covered in the AWD guide.

3. Make each unit consume fewer cubic feet

Because the limit is volume, packaging is a capacity lever that costs nothing per month. Cutting a carton’s cube by a fifth raises the units your existing limit permits by roughly a quarter — no request, no bid, no waiting. The same change often moves the FBA size tier too, so run the arithmetic on your top five SKUs by cubic feet held rather than by revenue.

4. Raise IPI, and accept that it is the slow lever

IPI is the only account-side input Amazon names, and “Sellers with consistently higher IPI scores receive higher capacity limits, adjusted for sales volume and available capacity” (Dominic_Amazon, 2026-08-02). Note consistently: this route is measured in quarters and will do nothing for a shipment you need to create on Friday. The component metrics and the order to repair them in are covered in the IPI score guide.

What makes the slow lever tolerable is forecasting: shorter, more frequent replenishments hold the same service level in less cubic footage. Restock forecasting tools run that cadence, and AMZFinder maintains an independent directory of the same category at its inventory and operations workflow page.

What a Tight Limit Costs You Now

With the overage fee withdrawn and the block quoted above in its place, the cost moved off the fee report and into quieter places: a Q4 shipment you cannot create in September is revenue that does not exist in November; a binding limit freezes the slow tail in place rather than removing it, and aged inventory surcharges climb the longer those units sit; and smaller, more frequent inbound tranches raise cost per unit, landing in landed cost and margin rather than anywhere labelled “capacity.”

Common Mistakes

• Quoting an overage-fee rate. It was withdrawn 1 July 2024; any article giving a dollar figure per cubic foot for exceeding your limit is recycling the March 2023 announcement.
• Planning against the unit number. The limit is cubic feet; the unit figure moves when your mix moves.
• Treating the two-month estimate as a commitment. Amazon states estimates “may vary up or down,” and POs sized against one carry that risk. Open shipments also count against usage from the moment they are created.
• Discovering the 39-week cliff after it arrives. A new professional account is uncapped, and its first limit reflects habits formed during that window.
• Reaching for AWD in an emergency. It is upstream-only, cannot be fed from FBA, and since 31 July 2026 accepts sortable items only.
• Bidding in Capacity Manager for slow SKUs. Credits offset the fee only to the extent the inventory sells through.

A Working Checklist

1. In the third full week of each month, read the confirmed limit and both estimates in the Capacity Monitor.
2. Convert open purchase orders to cubic feet — not units — and lay them against the estimate for their arrival month.
3. Rank on-hand inventory by cubic feet consumed and check whether the top five include slow movers occupying volume the winners need.
4. If a gap exists this month, price a Capacity Manager request and bid only on SKUs you expect to sell through the reserved space. If the gap is structural and your items are sortable, evaluate AWD before the next PO leaves the factory.
5. Run the packaging arithmetic on the highest-cube SKUs once a year, and treat IPI improvement as a quarterly objective rather than a fix for this week’s shipment.

Frequently Asked Questions

What is the Amazon FBA restock limit in 2026?

There is no separate restock limit. Amazon replaced the weekly restock limit and the quarterly storage limit with a single monthly capacity limit per storage type effective 1 March 2023, measured in cubic feet, covering both what you may store and what you may send (News_Amazon, checked 2026-08-02).

Where do I find my maximum inventory level?

In the Capacity Monitor at the bottom of the FBA dashboard, where Amazon states the table on the right displays estimated capacity limits for the next three months. Usage is still shown in units alongside the cubic-foot limit, but the cubic-foot number binds.

Does Amazon still charge FBA overage fees?

No. The News_Amazon account states on the public Seller Forums that “we eliminated the overage fee for storage effective July 1, 2024” (checked 2026-08-02). Exceeding your limit blocks shipment creation instead (Jameson_Amazon, Seller Forums, checked 2026-08-03). Monthly storage fees and aged inventory surcharges are separate and still apply.

How do I increase my FBA capacity limit quickly?

Capacity Manager is the only fast route: you specify a maximum reservation fee, Amazon grants requests starting with the highest fee per cubic foot until available capacity is allocated, and assesses them typically twice per week. Performance credits offset up to 100% of the fee if the inventory sells through.

Do new sellers have FBA restock limits?

New professional selling accounts active in FBA for less than 39 weeks do not receive capacity limits, per the Dominic_Amazon staff account (checked 2026-08-02). Individual accounts have a fixed 15 cubic feet Amazon states is not eligible to be increased.

Does AWD inventory count against my FBA capacity limit?

Amazon states inventory auto-replenished from AWD does not count toward FBA capacity limits (News_Amazon, checked 2026-08-02). Since 31 July 2026 AWD accepts only sortable items smaller than 18" x 14" x 8" and under 20 lbs, and inventory cannot be moved from FBA into AWD.

Conclusion

The restock limit did not get stricter; it got renamed, re-based into cubic feet, and detached from a fee. What binds you in 2026 is a monthly volume ceiling published in the third full week of the prior month, built from your IPI, Amazon’s forecast of your ASINs, your lead times, and warehouse space you cannot see. Plan purchasing against the two-month estimate while treating it as provisional, keep high-cube slow movers from eating the limit your winners need, and decide about AWD at the port rather than at the ceiling.