Yes, Amazon still charges a long-term storage fee, now called the aged inventory surcharge, and it kicks in at 181 days in FBA. Amazon assesses it monthly using a snapshot taken on the 15th, so you must submit any removal or disposal order before 11:59 p.m. Pacific on the 14th to dodge that month’s charge. The surcharge stacks on top of your base monthly storage rate and Q4 peak pricing, which is exactly why it erodes margins faster than most sellers expect.
TL;DR:
- The aged inventory surcharge applies monthly to SKUs held in FBA for over 181 days, stacking on top of regular storage fees and seasonal peak rates.
- Amazon calculates inventory age using network-level FIFO logic, not unit-specific tracking, affecting how sellers track aging inventory manually.
- Automating SKU age monitoring and setting alerts before 150 days can significantly reduce surcharge costs and improve removal timing.
- The 2026 fee bands for aged inventory can increase costs by hundreds of pounds for each month of storage, especially during Q4 peak periods.
- Combining manual review with automated analytics helps prevent fee miscalculations and avoid costly surcharges on slow-moving stock.
Table of Contents
- How the aged inventory surcharge works
- How does Amazon calculate inventory age each month?
- How fees are calculated and what the 2026 rate bands look like
- Aged inventory surcharge vs storage-utilisation and low-inventory fees
- What can you do to avoid or reduce these fees?
- Worked examples: what does holding aged stock actually cost?
- How automation and unified analytics cut fee risk
- An operational recommendation worth acting on this week
- Osellpa: monitor SKU age and forecast fees before they land
- Primary sources and calculators worth bookmarking
- Sources
How the aged inventory surcharge works
Amazon renamed the old long-term storage fee to the aged inventory surcharge and, since 2024, moved from a twice-yearly cleanup charge to a monthly assessment. That single change matters more than the rename. Under the old system, sellers had two annual windows (mid-February and mid-August) to clear stock. Now there is no seasonal breathing room. Every month carries the same risk.
The purpose behind the fee hasn’t changed: Amazon wants warehouse space turning over, not tied up in slow-moving units. The surcharge is Amazon’s way of pricing that opportunity cost directly onto the seller holding it.
A few things to keep straight about how it functions:
- It is charged in addition to your standard monthly storage fee, not instead of it.
- It applies per SKU, based on how long each unit has sat in the fulfilment network.
- It escalates the longer inventory ages, rather than applying a single flat rate.
Rates were adjusted again in January 2026, and seller forum discussions show plenty of frustration about how sharply the top-tier charges have risen. If you haven’t re-run your numbers since that update, your fee forecast is already out of date.
How does Amazon calculate inventory age each month?
Amazon uses network-level FIFO logic to determine age, not unit-level tracking. That means a fresh inbound shipment reduces your oldest-on-hand counts across the whole network rather than clearing a specific physical unit sitting in a specific warehouse. This is the detail that trips up sellers who track age manually in spreadsheets, because Amazon’s own methodology doesn’t match a simple “oldest box first” model.
The monthly cycle you need to build into your calendar looks like this:
- 1st to 14th: review your aged inventory reports and submit any removal or disposal orders.
- 14th, 11:59 p.m. PT: hard deadline. Miss it and that month’s snapshot will catch the stock.
- 15th: Amazon takes the snapshot that determines the charge.
- 18th to 22nd: fees post to your account.
Set a recurring task in the first two weeks of every month. This isn’t a quarterly job any more.
How fees are calculated and what the 2026 rate bands look like
Amazon calculates the aged inventory surcharge either per cubic foot or per unit, whichever produces the higher figure, then adds it to your base monthly storage rate. Base rates themselves swing hard by season: standard-size storage typically triples between off-peak months and the Q4 peak period, so ageing stock that survives into October, November and December gets hit twice, once by the seasonal base rate and once by the surcharge.
Representative age bands for 2026 look roughly like this (always confirm live figures in Seller Central, since rates shift without much warning):
Pro Tip: Model your worst-case SKU (the one that’s been sitting since spring) against the 271-to-365-day band before Q4 hits, not after. By the time you see the invoice, you’ve already paid for a month you could have avoided.
The gap between the lowest and highest bands is large enough that a single overlooked pallet can swing your monthly fee bill by hundreds of pounds. Always cross-check the live rate card in Seller Central before finalising a removal-versus-hold decision.
Aged inventory surcharge vs storage-utilisation and low-inventory fees
Sellers frequently conflate three separate charges, and mixing them up leads to bad decisions. Each one is triggered differently:
- Aged inventory surcharge: SKU-level, based purely on how long that item has sat in FBA past 181 days.
- Storage-utilisation surcharge: account-level, triggered when your overall storage volume exceeds Amazon’s capacity thresholds relative to your sales history.
- Low-inventory-level fee: the opposite problem, penalising sellers who chronically understock relative to demand rather than overstock.
It’s entirely possible to be hit by more than one at once. A seller with a bloated slow-moving catalogue can trigger both the aged surcharge on individual SKUs and a storage-utilisation surcharge across the account, while a fast-moving bestseller in the same account might simultaneously draw a low-inventory fee if replenishment lags. Treat these as three independent dials, not one combined “storage cost” line.
What can you do to avoid or reduce these fees?
A working playbook beats a reactive one. Here’s the sequence that keeps aged inventory under control month after month:
- Run the aged-inventory report every 1st to 14th window and flag anything approaching 150 days.
- Decide early: remove stock heading toward 181 days if it’s not selling, liquidate if margin allows, or discount aggressively through repricing and advertising if the product still has demand.
- Stage buffer stock upstream using Amazon Warehousing & Distribution (AWD) or an independent third-party logistics provider rather than sending everything into FBA at once. This keeps seasonal catalogues out of the aged-inventory clock until closer to their selling window.
- Automate the alert, not the action. Set a trigger at roughly 150 days so you have a genuine decision window before the surcharge starts, rather than discovering the problem on an invoice.
Pro Tip: Use a fee preview tool or calculator to model the removal cost against the projected surcharge before you commit. Removal fees are fixed and known; surcharges compound and are not.
The tactical trap most sellers fall into is treating this as a spreadsheet exercise done once a quarter. Sellers who automate SKU-age monitoring catch the drift weeks earlier than manual review allows, which is the difference between a £20 removal fee and a £200 surcharge.
Worked examples: what does holding aged stock actually cost?
Numbers make this concrete. Take a standard-size item costing £0.75 per cubic foot in off-peak base storage. At 200 days old, it falls into the first aged-inventory band, adding roughly £1.50 per cubic foot on top. Hold that same unit into Q4, where base rates roughly triple, and you’re now paying elevated base storage plus the surcharge simultaneously.
For a full pallet sitting at the highest tier through Q4, that compounding effect can outstrip the item’s remaining resale value within a few months. Once you’ve calculated a removal fee against the projected surcharge, removal usually wins for anything unlikely to sell within 60 days.
How automation and unified analytics cut fee risk
Manual spreadsheet tracking misses the network-level FIFO logic Amazon actually uses, which means sellers relying on manual unit counts routinely misjudge which SKUs are genuinely at risk. Automated dashboards that pull live inventory-age data directly from Amazon’s API close that gap.
The practical advantages worth building into your monthly workflow:
- Earlier drift detection: automated SKU-age alerts flag items approaching 150 days well before the 15th snapshot, not after.
- Faster action: unified dashboards let you queue removal or repricing decisions inside the same 1st to 14th window, rather than reconstructing the picture from separate reports.
- Fewer fee mismatches: reconciling projected charges against actual invoices catches billing errors that manual tracking tends to miss.
Osellpa’s profit-tracking and reconciliation tools are built around exactly this kind of continuous monitoring rather than periodic spreadsheet audits.
An operational recommendation worth acting on this week
Most sellers treat aged inventory as a quarterly clean-up job. That habit is outdated now the surcharge runs monthly. The three actions worth taking in the next seven days: pull your aged-inventory report today, set an automated alert at 150 days for every SKU, and move any genuinely seasonal buffer stock into AWD or a third-party warehouse rather than FBA. Sellers investing in tools that automate this tracking tend to catch problems while there’s still time to act cheaply.
— Harry
Osellpa: monitor SKU age and forecast fees before they land
Chasing aged-inventory reports through Seller Central every month, then cross-referencing them against a separate spreadsheet, is exactly the manual process that lets 181-day surcharges slip through unnoticed. Osellpa pulls your inventory age, profit data and fee exposure into one dashboard, connected directly to Amazon’s API, so you see which SKUs are drifting toward a surcharge tier before the 15th snapshot catches them.
The platform’s profit tracking flags margin erosion at the SKU level in real time, while automated reconciliation checks your actual fee invoices against what should have been charged. Combined with PPC optimisation that redirects ad spend away from slow-moving stock and toward SKUs worth clearing, it closes the loop between spotting a problem and doing something about it.
If you want to see how it maps to your own catalogue, start with Osellpa and watch how quickly it surfaces your highest-risk SKUs.
Primary sources and calculators worth bookmarking
For live rates and deadlines, check Amazon’s own aged inventory surcharge page. For worked cost comparisons, use the FBA storage fee calculator. Always verify current figures directly in Seller Central before acting.
