Aged Inventory Surcharge vs. Ad Spend: How to Set a Clearance ACoS Ceiling
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Stock received in February is past 270 days at the mid-November snapshot, where Amazon's aged inventory surcharge on it more than triples. Most brands meet that charge on the bill, after it is too late to avoid.
The aged inventory surcharge is a cost you can buy your way out of, and the price is set by arithmetic, not instinct: every unit you sell before the next monthly snapshot avoids the surcharges it would have paid, so it is worth more ad spend than your usual ACoS target allows. This piece shows how to turn that into a clearance ACoS ceiling, how to know when to stop, and when ads are the wrong tool.
Quick Answer: the ad ceiling is the margin you keep plus the fee you avoid
- The rule: the most you should pay in ads to sell one aged unit is its contribution margin before ads plus the aged inventory surcharges that unit would otherwise pay. Divide by price and you have a clearance ACoS ceiling.
- The deadline: Amazon measures inventory age on the 15th of each month, so a unit sold (or removed) by the 14th skips that month's charge.
- Where it pays most: bulky SKUs about to cross 271 days, where the per-cubic-foot rate jumps from $1.50 to $5.45 a month.
- The opportunity: a "bad" ACoS on aged stock can beat both the storage bill and a deep discount, and you keep your list price.
- The risk: ads cannot sell a listing that does not convert, and spend above the ceiling costs more than the fee it avoids. Set the stop before the push starts.
How the 2026 aged inventory surcharge sets your deadline
Every FBA unit pays the regular monthly storage fee. The aged inventory surcharge is a separate charge layered on top once a unit has sat in the fulfillment network for more than 180 days, and it grows as the unit ages. Amazon publishes the schedule on its aged inventory surcharge help page; the US rates below have applied since January 16, 2026, as summarized in Goat Consulting's 2026 FBA rate card. Confirm them against your own Fee Preview report before you build a plan on them, because Amazon revises fees during the year.
| Inventory age on the 15th | Monthly surcharge per cubic foot | Per-unit minimum | What it means for clearance |
|---|---|---|---|
| 181–210 days | $0.50 | None | Early warning: cheap to wait, cheap to act |
| 211–240 days | $1.00 | None | Start planning the push |
| 241–270 days | $1.50 | None | Last cheap month: act before the 14th |
| 271–300 days | $5.45 | None | The cliff: the rate more than triples |
| 301–330 days | $5.70 | None | Every month held now costs more |
| 331–365 days | $5.90 | None | Removal starts to compete with ads |
| 366–455 days | $6.90 | $0.30, whichever is greater | Small items still pay the floor |
| 456+ days | $7.90 | $0.35, whichever is greater | Exit what will not sell |
US aged inventory surcharge, effective January 16, 2026. Clothing, shoes, bags, jewelry, and watches are exempt from the 181–270 day tiers. Verify current rates in Seller Central.
Three mechanics drive everything that follows:
- It is charged monthly, not once. A unit that sits for three more months pays three more surcharges, each higher than the last.
- It is assessed on the 15th. Amazon's own aging inventory action plan sets 11:59 p.m. PT on the 14th as the cutoff for removal and disposal orders to keep units out of that month's charge. The same date is your sell-by date.
- It is priced by volume. The fee per unit is the rate times the unit's cubic feet, so size decides whether a SKU is worth an ad push at all.
The jump at day 271 is where the math changes
Between 241 and 270 days, a unit costs $1.50 per cubic foot a month. One month later it costs $5.45. That single step is the clearest signal in the schedule: inventory sitting in the 241–270 band today is the inventory to work on now, while a modest push can still get ahead of the expensive tiers.
Size decides whether the push is worth a campaign
| Unit size | Surcharge per unit, 241–270 days | Surcharge per unit, 271–300 days | Clearance takeaway |
|---|---|---|---|
| 0.10 cu ft (a phone case) | $0.15 | $0.55 | The fee barely moves the ceiling; price or removal usually wins |
| 0.42 cu ft (a small kitchen gadget) | $0.63 | $2.29 | Worth a capped push, especially across several months |
| 1.0 cu ft (a countertop appliance) | $1.50 | $5.45 | The fee is a real budget line; ads often pay |
| 2.5 cu ft (a large bulky item) | $3.75 | $13.63 | Every unit sold early is worth a lot of ad spend |
Per-unit surcharge equals the monthly rate times the unit's cubic feet. Unit examples are illustrative.
Set the clearance ACoS ceiling from three numbers
You need the unit's price, its contribution margin before ad spend (after cost of goods, referral, and fulfillment fees), and the surcharges it will pay if it does not sell soon.
Clearance ceiling per unit = contribution margin before ads + surcharges avoided
Clearance ACoS ceiling = clearance ceiling per unit ÷ price
Your normal break-even ACoS is margin divided by price. The clearance ceiling sits above it by exactly the fee avoided as a share of price. Any ACoS between the two loses money on the sale and still beats letting the unit sit.
Count the months, not just the next bracket
The fee you avoid is not one month's surcharge. It is every surcharge the unit would have paid before it finally sells. If your current sales pace means the last aged unit leaves in three months, a unit you sell now saves three months of rising charges. Divide units on hand by daily sales to see how long the stock will sit, then add up the surcharge for each 15th it would cross.
The ceiling is a stop line, not a target
At the ceiling you are indifferent between paying for the click and paying Amazon to hold the unit. Run the push well inside it and treat the ceiling as the number that ends the campaign. If your margin floor is stricter than the ceiling, the floor wins.
Discount the fee for sales that would have happened anyway
ACoS counts every ad-attributed sale, including some that would have happened organically. Those sales do not avoid any fee you were not already avoiding. If you suspect a large share of attributed sales are organic buyers clicking an ad, cut the fee portion of the ceiling, and judge the push by total daily units sold, not by ACoS alone.
Worked example: 480 units heading into the 271-day band
All figures are hypothetical, built on the 2026 rates above.
The input. A kitchen gadget sells for $39.99, measures 0.42 cubic feet, and earns $11.20 per unit before ads. Its normal ACoS target is 20%, and break-even ACoS is 28.0%. On October 28, 480 units from one February 12 shipment are 258 days old and selling five a day. On November 15 they will be 276 days old.
The workflow.
- Project the snapshots. At five a day, 390 units are still there on November 15 (271–300 band), 240 on December 15 (301–330), and 85 on January 15 (331–365). The last unit sells in early February. Doing nothing costs about $1,678 in surcharges, on top of regular storage.
- Price the marginal unit. Selling one extra unit now shortens the queue, so the last unit leaves sooner and skips three charges: $2.29 + $2.39 + $2.48 = $7.16.
- Set the ceiling. $11.20 + $7.16 = $18.36 per unit, or a clearance ACoS ceiling of 45.9%.
- Run a capped push. Raise bids and budgets on the gadget's best-converting non-branded targets until November 14, aiming for nine units a day, with the campaign stopped if ACoS passes 40%.
The output. Suppose the push adds four units a day for 18 days, at a 38% ACoS on those extra sales. That is 72 extra units and $1,094 of extra ad spend, or $15.20 per unit. Surcharges fall to about $1,162, a saving of $516. Net of the ad spend and the margin earned on those 72 units, the brand is about $228 better off than if it had done nothing, while running a campaign that looks like a failure on a standard ACoS report.
The business decision. Keep the push running through November 14, then reset the target for the December 15 snapshot. A 20% markdown that produced the same 72 extra units would have cost $8.00 on all 162 units sold in the window, or $1,296, more than the ad push, and it would have lowered the price for the shoppers who were already buying. The 13 units projected to remain on January 15 are the candidates for a removal order before the 14th.
Compare the exits before you pick one
| Option | What it costs per unit | Best when | Outcome |
|---|---|---|---|
| Do nothing | Every surcharge until the unit sells | Stock will clear before the next 15th anyway | Fine for small units close to selling through |
| Capped ad push | Ad spend up to the clearance ceiling | The listing converts and needs more traffic | Keeps list price; best for bulky SKUs near day 271 |
| Markdown or Outlet deal | The discount, on every unit sold in the window | The listing is seen but the price is wrong | Moves units, but discounts buyers who would have paid full price |
| Removal or disposal | The removal fee, plus the margin you never earn | Demand is gone or the SKU is discontinued | Stops the surcharge for good |
| Liquidation | Whatever the buyer pays | You need the cash and the space now | Fast, with recovery set by someone else |
Amazon's Outlet deals require a discount of at least 20%, per its aging inventory action plan.
Ads and price are not either-or. If a listing is invisible, a discount lowers the price of something nobody sees; if the price is wrong, more traffic buys more unconverted clicks. Our guide to clearing dead stock with dynamic pricing and ads covers running both against a price floor.
Run a weekly aged-stock review, not a year-end scramble
- Pull inventory age. Use the FBA Inventory tool or the Aged Inventory Surcharge report to list SKUs by age band, and the Fee Preview report for unit dimensions.
- Flag what crosses a bracket in the next 30 days, with the 241–270 band first.
- Project the months each SKU will sit at its current pace, and add up the surcharges a marginal unit avoids.
- Set the clearance ACoS ceiling per SKU, then a working cap below it.
- Push only that ASIN. Raise bids and budgets on its best-converting targets in steps, leave branded campaigns and other SKUs' budgets alone, and set a revert date before you change anything.
- Check pace against the 14th. If the push will not clear enough units, decide on removal or a markdown while there is still time to submit it.
Brands that run this review weekly start in the 211–240 band, when small pushes are enough. Brands that wait for the bill start after the cliff.
Where the ceiling stops working
- It cannot create demand. If the ASIN does not convert at full price, a higher ACoS buys more clicks that do not sell. Fix the listing or the price first.
- Attribution lags. Ad sales land in reports days after the click, so a push started on the 10th will not show its result before the 14th. Start earlier.
- Seasonal stock is different. Inventory ahead of its season may be worth holding through a surcharge or two. Compare the fee against the margin you expect in season.
- Exempt categories skip the early tiers. Clothing, shoes, bags, jewelry, and watches are exempt from the 181–270 day charges, which changes the timing.
- The rates are Amazon's to change. Rebuild the ceiling whenever the fee schedule moves. Regular monthly storage, which this math leaves out, only makes selling sooner more valuable.
Common mistakes with aged stock
- Treating every ACoS above target as waste, when the extra spend costs less than the surcharge it avoids
- Waiting for the storage bill, which arrives after the 15th, when that month's charge is already set
- Clearing with discounts alone, when a short, capped ad push could sell the same units at list price
- Pushing with no stop line, so the campaign keeps spending after the ceiling stopped making sense
- Raising account-wide budgets instead of the aged ASIN's own targets, which spends clearance money on healthy SKUs
Where Trellis fits: running the review every week instead of once a year
The math here fits on a napkin for one SKU. The hard part is doing it every week for a whole catalog, before the 14th, and remembering to undo the bid changes afterward.
Qore, Trellis' workflow product, runs this as a skill. The Overstock Clearance Engine finds stock headed for the next aged-inventory bracket, sizes the units to clear and the daily pace needed, and sets a break-even ACoS ceiling plus the storage fee avoided, with your margin floor overriding it when stricter. It raises bids and budgets on the aged ASIN's best-converting targets in capped steps, never touches branded campaigns or other ASINs' budgets, and sets a revert date before any change. You approve the ceiling, any promo, and any large raise; nothing moves without that approval.
On the pricing side, Qinetix, Trellis' ads automation platform, runs dynamic pricing inside operator-set floors and ceilings and can watch Days on Hand, so a markdown on slow stock stops where you told it to. Ads and pricing run as parallel mechanisms with shared visibility in one platform, so you can see both levers on the same aged SKU. See the advertising features for how Qinetix handles bids and rules.
The bottom line for eCommerce teams
- The aged inventory surcharge is a monthly charge set on the 15th. The 14th is your real deadline.
- A unit sold early is worth its margin plus every surcharge it skips. That sum, divided by price, is your clearance ACoS ceiling.
- The day-271 jump and large unit volume are where a capped ad push pays most.
- Push one ASIN at a time, set the stop and the revert date first, and exit what will not clear.
Conclusion: put a number on the fee before it lands
Old stock does not need a fire sale. It needs a ceiling. Work out what the aged inventory surcharge will cost each SKU over the months it will sit, add the margin you keep by selling, and you have the most ad spend that sale is worth. Spend inside that number before the 14th, stop when you reach it, and send what remains to removal while the charge is still avoidable. For the everyday targets that sit underneath this, see our guide to Amazon ACoS targets, and for the opposite problem of too little stock, inventory-aware PPC.
If you want this review running across your catalog every week, with you approving each push, see the Overstock Clearance Engine in action.
Frequently Asked Questions
It is a monthly fee Amazon adds on top of regular FBA storage for units that have sat in its fulfillment network for more than 180 days. It is charged per cubic foot, rises as inventory ages, and is assessed on a snapshot taken on the 15th of each month. Check the current schedule in Seller Central.
It replaced what sellers used to call the long-term storage fee, and many people still use the old name. It is separate from the regular monthly storage fee that every FBA unit pays, so aged units pay both.
Sell the units or submit a removal or disposal order by 11:59 p.m. PT on the 14th, before Amazon takes its snapshot on the 15th. Units still in the fulfillment network on the 15th are assessed for that month.
Up to the clearance ceiling: the unit's contribution margin before ads plus the surcharges it would otherwise pay, divided by price. Above that, the ad spend costs more than the fee it avoids. Run the push well inside the ceiling and stop when you reach it.
It depends on why the stock is slow. If the listing converts but lacks traffic, a capped ad push can sell units at list price. If shoppers see it and still do not buy, the price is the problem and a markdown or Outlet deal fits better. Many brands run both against a price floor.
When demand is gone, the SKU is discontinued, or the unit is small enough that the surcharge barely moves the ad ceiling. Removal stops the charge for good, at the cost of a removal fee and the margin you never earn.