When sellers say they want to ship all their Amazon FBA inventory to one warehouse, they are describing an option Amazon actually sells: minimal shipment splits. You send one shipment to one destination, Amazon redistributes the units across its network afterwards, and you pay a per-unit FBA inbound placement service fee for the privilege. The free alternative — Amazon-optimized shipment splits — costs $0 in placement fees but requires you to send to four or more locations and to meet a carton-uniformity requirement many small sellers cannot meet. So this is an arithmetic question, not a policy question: one warehouse is cheaper whenever the placement fee costs less than the extra freight you would pay to split.
This page gives you the three official options, the way the fee is structured and billed, and a break-even threshold you can run on a napkin before you build the shipping plan.
The Three Official Placement Options
Amazon introduced the inbound placement service fee effective 1 March 2024. Every shipping plan you build resolves to one of three placement options, and the option you pick is what determines whether you pay.
| Option | Destinations | Placement fee | Who decides where units end up |
|---|---|---|---|
| Amazon-optimized shipment splits | Four or more locations | No fee | You ship directly to the set Amazon assigns |
| Partial shipment splits | Two or three locations | Reduced per-unit fee | Split between you and Amazon |
| Minimal shipment splits | Typically a single location | Full per-unit fee | Amazon redistributes after receipt |
Two constraints matter more than the table suggests.
Partial splits are gone for standard-size products. For shipping plans created on or after 20 February 2025, partial shipment splits are available only for large bulky inventory. If you sell standard-size items, your real choice is binary: qualify for Amazon-optimized splits and pay nothing, or take minimal splits and pay the full per-unit fee. The middle option is not on your screen.
“No fee” is not the same as “available to you.” Amazon-optimized splits at $0 require a meaningful volume commitment per item — Amazon’s help documentation frames the qualifying condition around sending at least five identical cartons or pallets per item, each holding the same quantity and item mix. A seller inbounding 40 units of a SKU in two mixed cartons does not have a free option to compare against. For them the question is not “which is cheaper” but “how much does inbounding cost at all.”
Source note (checked 2026-08-19): the definitions, the 1 March 2024 start date and the 20 February 2025 change to partial splits come from Amazon’s “FBA inbound placement service fee” help page (sellercentral.amazon.com/help/hub/reference/external/GC3Q44PBK8BXQW3Z). Seller Central help pages return a navigation-only shell to automated fetches, so these were confirmed through Amazon-domain search results rather than a direct page read.
What the Fee Costs Per Unit
The fee is charged per unit, and the rate depends on three things: the product’s size tier, its shipping weight band within that tier, and the inbound region the shipment goes to. There is no single number.
This page deliberately publishes no per-unit rate table. On 2026-08-19 the Seller Central fee page returned 171,876 bytes containing zero occurrences of the word “placement” and zero dollar amounts — it renders its rate grid client-side, and the Wayback Machine’s 2026-03-09 capture is the same empty shell. The third-party summaries that fill that gap flatly contradict one another: for the large standard tier alone, independent write-ups put the top of the per-unit range anywhere from roughly $0.36 to $1.90 — a two-to-fivefold spread, with no way to tell which vintage of Amazon’s rate card each one copied. Amazon’s own fee page is the only authoritative source for these figures, and Amazon has restructured the bands more than once. Reprinting one of those columns here would be picking a winner at random and handing you a number to budget against that is probably wrong.
What is safely documented is the shape rather than the amounts: rates step up across small standard, large standard, the oversize tiers and special oversize, and every source we checked agrees on that ordering even where the numbers disagree. The distance between tiers is far wider than the spread within any one tier — so which tier your ASIN falls into moves the answer more than its weight band or destination region does.
What we can quote from an Amazon-owned domain is the direction of travel for 2026. Amazon’s selling-partner announcement states: “In 2026, FBA fees will increase by an average of $0.08 per unit sold, or less than 0.5% of an average item’s selling price,” with all changes effective 15 January 2026. That announcement does not break out the placement fee specifically. Our page on the 2026 FBA fee changes covers the parts that were itemised.
To get the real number, build a shipping plan in Send to Amazon for the ASINs and quantities you actually intend to send and work through to the placement-option screen, where Amazon prices the options side by side for that specific shipment. The per-unit fee it quotes for minimal splits already reflects your size tier, weight band and destination region — the three things a published table cannot know about you. After receipt, reconcile against the FBA inbound placement service fee report, which shows what you were billed rather than what was estimated. Use that number, not a blog number, including not the illustrative one below.
When Amazon Charges You
The billing timing surprises people more than the rate does.
You are charged the inbound placement service fee 45 days after your shipment is received, and the charge is based on the inbound location the units actually went to and the quantities actually received — not on what your shipping plan predicted. Three practical consequences:
- The cost lands in a different month than the shipment. A March inbound shows up as a May charge. If you reconcile landed cost by month, the placement fee will not line up with the freight invoice for the same units unless you deliberately match them.
- Short receipts reduce the fee. Because it is billed on quantities received, units that never got receipted are not billed. That is a small consolation for a lost carton, but it does mean your estimate and your invoice will rarely match to the cent.
- There is a dedicated report. Amazon publishes an FBA inbound placement service fee report so you can attribute charges back to specific shipments. Pull it before you build the next quarter’s plan rather than arguing from estimates.
Should You Ship Your Amazon FBA Inventory to One Warehouse? The Break-Even Math
Here is the whole decision in one line:
Splitting is worth it only if the extra freight per carton is less than (placement fee per unit × units per carton).
That right-hand side is your threshold. Everything else is bookkeeping.
A worked example, with every assumption on the table
Assumptions — change any of them and the answer changes:
- 500 units of a large standard item, packed 25 units per carton = 20 cartons.
- Placement fee assumed at $0.32 per unit. An arbitrary placeholder picked to keep the arithmetic legible — not a quoted rate, and not taken from any Amazon rate card. Substitute what your own Send to Amazon workflow shows: double this rate and both the placement column and the per-carton threshold double with it, while the shape of the decision is unchanged.
- Single-destination freight assumed at $18 per carton (one LTL lane — an illustrative figure, not a quoted rate).
- Four-destination freight assumed at $24 per carton (four smaller shipments at small-parcel pricing with no volume break — also illustrative).
| One warehouse (minimal splits) | Four warehouses (Amazon-optimized) | |
|---|---|---|
| Placement fee | 500 × $0.32 = $160 | $0 |
| Freight | 20 × $18 = $360 | 20 × $24 = $480 |
| Total inbound cost | $520 | $480 |
Splitting wins by $40. Now the threshold: the placement fee spread over 20 cartons is $160 ÷ 20 = $8.00 per carton. So splitting is cheaper only while it costs you less than $8.00 extra per carton than the single-destination lane.
How the answer moves when the assumptions move
- Split premium of $3/carton instead of $6 → splitting costs $420 and wins by $100. Common when all four destinations sit on the same coast as your forwarder.
- Split premium of $10/carton → splitting costs $560 and one warehouse wins by $40. Common when Amazon assigns a destination in a region your carrier prices badly, or when a four-way split drops each shipment below an LTL minimum.
- Denser cartons raise the threshold. At 50 units per carton the same $0.32 fee is worth $16.00 per carton of split premium — one warehouse gets much harder to beat.
- Sparser cartons collapse it. At 8 units per carton the threshold is $2.56, and almost any real split premium beats paying the fee.
- Heavier size tiers flip it faster. The rate steps up by size tier, so an oversize item carries a higher per-unit fee than a standard one at the same carton density, raising the threshold and making one warehouse harder to beat. How much higher is exactly the number to pull from Send to Amazon rather than estimate.
The pattern worth remembering: units per carton is the lever, not the fee rate. Two sellers paying the identical per-unit fee reach opposite conclusions purely because one of them packs four times as densely.
The costs this comparison leaves out
The table above prices inbound only. Before you commit, sanity-check three things the arithmetic ignores: whether a four-way split pushes any single shipment under your carrier’s minimum, whether splitting delays the slowest destination enough to matter for a launch, and whether your FBA capacity limit makes the whole shipment size moot. And if you are palletising, the FBA pallet requirements constrain how you can split at all.
Four Charges People Mix Up
The placement fee gets blamed for charges it did not cause. These are four distinct line items, and only one of them responds to your placement choice.
| Charge | What triggers it | When it is billed |
|---|---|---|
| Inbound placement service fee | Choosing fewer destinations than Amazon-optimized | 45 days after receipt, per unit received |
| Inbound transportation (partnered carrier) | Moving the boxes to the destination | At shipment creation or carrier invoicing |
| Monthly inventory storage fee | Space occupied per cubic foot, per month | Monthly, on measured volume |
| Aged inventory surcharge | Units sitting past the age thresholds | Monthly, on top of storage |
Only the first one is affected by how many destinations you pick. If you are building a full unit-economics model rather than a single shipment decision, start from FBA fees and profit, and see the aged inventory surcharge page for the long-tail cost of getting the quantity wrong.
Decision Checklist
Copy this and run it before you build the shipping plan:
- Count your cartons per item. Fewer than five identical cartons → Amazon-optimized is not available; skip to step 5.
- Check the size tier. Standard-size → partial splits are off the table; the choice is optimized or minimal.
- Read the actual per-unit fee in Send to Amazon for this ASIN and destination. Do not use a number from a blog post.
- Compute the threshold: per-unit fee × units per carton = maximum acceptable split premium per carton.
- Quote both lanes with your forwarder: one destination vs. the destination set Amazon proposes. A freight forwarder can usually quote both in the same email.
- Compare against the threshold. Split premium below it → split. Above it → pay the placement fee.
- Re-run it per shipment. The destination set changes, and so does the answer.
If the answer keeps coming out against you, the structural fix is upstream: Amazon Warehousing and Distribution changes where the distribution problem sits rather than optimising a bad shipping plan.
Frequently Asked Questions
Can I force Amazon to accept all my FBA inventory at one warehouse for free?
No. Sending to a single destination is the minimal shipment splits option, and it carries the per-unit placement fee by design. The only $0 route is Amazon-optimized shipment splits, which requires shipping to the four-or-more destination set Amazon assigns.
Why did my placement fee estimate change after I created the shipment?
The fee is billed on the inbound location and the quantities Amazon actually received, 45 days after receipt. An estimate built at plan creation is a forecast; short receipts, re-routed cartons and reclassified size tiers all move the final number.
Is the placement fee charged per shipment or per unit?
Per unit. That is why carton density drives the decision — the fee scales with units while your freight savings scale with cartons.
Do partial shipment splits still exist?
For large bulky inventory, yes. For standard-size products they were withdrawn for shipping plans created on or after 20 February 2025, leaving standard-size sellers with a two-way choice.
Where do I find the exact rate for my product?
In the Send to Amazon workflow when you select a placement option, and after the fact in the FBA inbound placement service fee report. Amazon’s own fee page is the reference table; third-party summaries go stale every time Amazon restructures the bands, and the ones we checked disagreed with each other by two to five times — which is why this page quotes none.
Conclusion
Shipping all your FBA inventory to one warehouse is a purchase, not a workaround: you are buying distribution labour from Amazon and paying per unit for it. Whether that is a good purchase depends almost entirely on how densely you pack. Multiply the per-unit fee by your units per carton, get a per-carton threshold, and ask your forwarder what a four-way split actually costs. If the split premium is under the threshold, split. If it is over, pay the fee and stop feeling bad about it — and pull the placement fee report in 45 days to check that the number you planned against is the number you got.
Rates and policy details on this page were checked on 2026-08-19. No per-unit placement rate table is published here on purpose: the third-party figures we checked disagree with one another by two to five times, and none could be verified against Amazon’s own fee page. Confirm your own rate in Send to Amazon before acting on any arithmetic here.