Prime Day Leftovers: What to Do With Unsold Inventory (2026)

Seasonal playbook · 2026

Quick answer: Prime Day 2026 ran June 23–26 — which means whatever didn’t sell has now been sitting in FBA for three-plus weeks, and it’s time to make a call on it. Triage every leftover SKU by days of supply at its real, post-spike velocity: under ~90 days, hold and do nothing; 90–180 days, sell it down before Q4 storage rates arrive in October; beyond that, price aggressively, move it through another channel, or remove it. And before you do any of it, fix your velocity numbers — a four-day promo spike left inside your average daily sales will quietly inflate every reorder you place for the next month.

Prime Day advice all points one direction: get ready, stock deep, don’t run out. Then the event ends, the dashboards cool off, and nobody writes the sequel — what to do with the inventory that didn’t leave.

Three weeks out is the honest checkpoint. The bulk of the returns are in (the window runs about a month, so expect a tail), your sales data shows what the event actually did per SKU, and the next deadline is already visible: for most sellers, August is when Q4 purchase orders go out. Every dollar sitting in Prime Day leftovers is a dollar that isn’t available for the inventory that has to land before Black Friday.

Here’s the playbook, in the order that protects the most cash.

Step 1: Fix your forecast before you touch the inventory

This is the step almost everyone skips, and it’s the one that compounds. A Prime Day spike sitting inside your trailing average doesn’t just describe the past badly — it writes the wrong future, because your reorder points multiply that average by your lead time.

Take a SKU that normally sells 10 units a day. During the four event days it did 60 a day. A 30-day trailing average now reads:

(26 days × 10) + (4 days × 60) = 500 units → 16.7/day
Real baseline: 10/day — the spike inflated your velocity by 67%

Feed 16.7 into a reorder point with a 60-day lead time and you’ll order roughly 400 units more than the SKU actually needs — on top of the leftovers you’re trying to work down. The overstock problem reorders itself.

The fix is simple, whatever tool or spreadsheet you use: compute average daily sales with the promo window excluded (or capped at a normal day’s rate), and check whether the post-event run rate has settled back to the pre-event baseline. Sometimes it settles higher — Prime Day introduced the product to buyers who are now reordering and reviewing. That SKU isn’t overstocked; it’s growing. Which is exactly why this is a per-SKU read, not a blanket rule.

A promo spike left inside your average doesn’t just misread last month — it mis-orders next month.

Step 2: Triage every leftover SKU by days of supply

With honest velocity numbers, days of supply becomes trustworthy again: units on hand ÷ real daily sales. Now bucket every SKU that came out of Prime Day heavier than planned:

Days of supply (at real velocity)	What it is	What to do
Under ~90 days	Not a leftover — it’s just stock	Nothing. Q4 demand will absorb it. Resume normal replenishment off the corrected velocity.
~90–180 days	An overweight position	Sell it down before October: sharpen the price, coupon it, bundle it with a fast mover, push it on your other channels. Pause reorders until it’s back under target coverage.
180+ days	A fee magnet	Act now — aggressive markdown, liquidation, or pull it out of FBA. Holding is a decision too, but make it with the fee math open in front of you, not by default.

The reason the buckets break where they do is the calendar, not a round number. Amazon’s monthly storage rates step up for October through December, so every cubic foot of slow stock costs more precisely when your fast stock needs the space. And the aged-inventory surcharge starts once units cross 181 days in fulfillment centers — stock that landed in early June crosses that line in early December, in the middle of peak. A SKU at 200 days of supply today is scheduled to be paying peak-season rent and an age surcharge on its slowest-moving units unless you intervene.

Step 3: Pick the exit that fits the SKU

Sell it through — usually the best margin exit

A markdown you control almost always beats a liquidation you don’t. Work the price down in steps, run a coupon, or attach the slow mover to a bestseller as a bundle. If the unit economics still clear your floor, this is the exit that returns the most cash per unit.

Move it — if Amazon isn’t your only shelf

Leftovers on Amazon aren’t necessarily leftovers everywhere. Your Shopify store, Walmart, wholesale, even a B2B closeout buyer can clear stock at prices Amazon shoppers were never going to pay. This is one of the quiet advantages of running more than one channel — a demand miss on one shelf becomes a transfer, not a write-off.

Liquidate or remove — the deliberate loss

Amazon offers liquidation and removal paths for stock you’ve decided not to carry into Q4. You’ll recover pennies on the dollar (liquidation) or pay per-unit fees to get it back or dispose of it (removal) — but a small certain loss now can beat months of storage on a SKU that was never going to move. Do the math per SKU: remaining storage cost until sell-through vs. the loss you’d book today.

The honest caveat: most post–Prime Day advice is liquidation-happy. For a lot of SKUs the cheapest option is to do nothing — Q4 is the biggest demand quarter of the year, and an “overstock” in July is often just Black Friday inventory that arrived early. There’s a fee on the other side of this trade too: run stock down too hard and Amazon’s low-inventory-level fee starts charging you for being too lean relative to demand. The skill isn’t “clear everything” — it’s knowing which bucket each SKU is actually in.

Step 4: Protect August

The real deadline hiding behind all of this is the Q4 order window. With typical 60–90 day lead times, purchase orders placed in August are the ones that land in October — in position for Black Friday and Cyber Monday. Leftover inventory hurts you twice here: it ties up the cash you need for those POs, and (if you skipped Step 1) it inflates the velocity numbers those POs are sized from.

So sequence it: correct the velocity, triage the leftovers, free the cash — then size Q4. Sellers who liquidate in September are usually paying for a decision they declined to make in July.

See your real days of supply, per SKU, per channel

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Frequently asked questions

When was Prime Day 2026?

Prime Day 2026 ran June 23–26 — four days, and earlier than usual. The event is typically held in July, but Amazon moved it to June in 2026.

What should I do with unsold Prime Day inventory?

Triage each SKU by days of supply at its real (spike-corrected) velocity. Under ~90 days of supply: hold — normal demand will absorb it. Around 90–180 days: sell it down before Q4 storage rates start in October, and pause reorders. Beyond that: mark it down aggressively, move it through another channel, or use Amazon’s liquidation or removal options.

How does Prime Day distort my sales velocity?

A four-day spike sitting inside a 30-day trailing average can inflate average daily sales dramatically — a SKU that sells 10 a day but did 60 a day during the event reads as 16.7 a day afterward. Since reorder points multiply velocity by lead time, that error becomes an oversized purchase order. Exclude or cap the promo window when computing your baseline.

Should I remove leftover inventory from FBA?

Not by default. Removal and disposal cost per-unit fees, Q4 is the year’s biggest demand quarter, and running stock down too far can trigger Amazon’s low-inventory-level fee. Remove or liquidate when the remaining storage cost until realistic sell-through exceeds the loss you’d book today — that’s a per-SKU calculation, not a policy.

When do Amazon storage fees go up for Q4?

Amazon’s monthly inventory storage rates step up for October through December, the peak season. Slow-moving stock also risks the aged-inventory surcharge as units cross the 181-day mark — inventory received in early June hits that line in early December.

When should I order Q4 and Black Friday inventory?

Count backward from when it must be sellable. With typical 60–90 day end-to-end lead times, purchase orders placed in August land in October — in position for Black Friday and Cyber Monday. That’s why clearing Prime Day leftovers in July matters: it frees the cash those orders need.