Amazon FBA Aged Inventory Surcharge: The 180-Day Rule and Inventory Clearance Strategies

This post is for Amazon FBA sellers whose inventory tends to sit in fulfillment centers for extended periods. If you have any seasonal items past their prime, products that underperformed expectations, or stock you over-ordered that's now stagnant, this applies to you. Amazon charges an additional fee for inventory that remains in fulfillment centers for too long, separate from the standard monthly storage fees. The critical threshold for this is 180 days (starting from day 181). We've outlined when and how this surcharge is calculated, and what you need to do before your inventory crosses that deadline.

What is the Aged Inventory Surcharge? The Aged Inventory Surcharge (sometimes called "seasoned" inventory surcharge) is an additional per-unit fee applied to inventory stored in Amazon fulfillment centers for 181 days or longer. The key word here is "additional." This fee doesn't replace your existing FBA Monthly Storage Fee; rather, it's added on top of it.

The assessment timeline has also changed. Amazon has tightened its FBA inventory management policies, moving the application point up to 181 days. This is 90 days earlier than previous standards, meaning if you're still operating under the old assumption that "270 days is safe," you could face unexpected costs.

Furthermore, many sellers are only familiar with the traditional Long-Term Storage Fee and overlook the fact that the Aged Inventory Surcharge is a separate charge. Both fees can be incurred simultaneously, and unlike a one-time charge, the Aged Inventory Surcharge is reapplied monthly. As long as your inventory isn't sold or removed, that bill will keep coming every month.

Rates Increase Incrementally as Inventory Ages Amazon applies a tiered rate structure based on inventory age. Instead of a fixed rate after 181 days, the fee increases incrementally as your inventory crosses each age bracket.

181-210 days: The first surcharge tier. Additional costs begin to accrue beyond your monthly storage fees. 211-240 days: Rate increases. 241-270 days: Rate increases again. 271-300 days: A relatively new tier, applying higher rates earlier than before. 301-330 days: Further increase. 331-365 days: Continues to rise steadily. 365+ days: The highest rate tier.

Once inventory exceeds 365 days, the nature of the fees changes. For inventory aged 12 months (365 days) or more, a minimum of $0.30 per unit (or $6.90 per cubic foot, whichever is greater) is charged. For inventory aged 15 months (455 days) or more, this increases to $0.35 per unit (or $7.90 per cubic foot, whichever is greater). Since these are charged in conjunction with volume-based monthly storage fees, even small items can quickly accrue significant per-unit costs. Essentially, if you don't dispose of it quickly, you're guaranteed to incur losses.

However, the exact rates vary based on the product's Size Tier and the specific period. Use the tiers above as a general guide, but always verify the actual fees for your products in Seller Central.

Monthly 15th Snapshot and FIFO Calculation The Aged Inventory Surcharge is assessed by taking a snapshot of your inventory on the 15th of every month, and it applies to any inventory stored in fulfillment centers for 181 days or more at that time. Whether through sales promotions or removal orders, your inventory must be cleared before the 15th to avoid that month's surcharge.

You should also understand the calculation method. Amazon calculates inventory age using the FIFO (First-In, First-Out) method. This means that inventory that arrived first is considered sold or removed first. So, even if your most recent shipments are selling well, the age of your older inventory continues to accrue if it remains. This is where situations like, "My product is selling great lately, why am I getting a surcharge?" arise. Good sales volume is separate from having units in the warehouse that have exceeded 181 days.

I've Been Hit By This Surcharge Myself Rather than reading lengthy policy explanations, experiencing it once tends to simplify your decision-making.

I've personally been hit with this surcharge. Since then, I make sure to clear out inventory before it reaches 180 days. If I don't think it will sell, I either dispose of it or run a discount deal to sell it off cheaply, ensuring it doesn't cross the deadline.

The key is not to react after 180 days, but to make a decision before 180 days. Whether you dispose of it or discount it, there will be some loss. However, inventory that exceeds the deadline will incur the surcharge again every 15th of the month, and the rate will increase as it moves into higher tiers. A quick calculation will show you which is more advantageous: cutting your losses with a one-time hit or enduring ever-increasing monthly costs.

Identify Risk Zones in Advance with Reports To make decisions before the deadline, you first need to know how old your inventory is. Amazon already provides reports for this purpose.

Inventory Age Report: Check via Reports → Fulfillment → Inventory Age. You can also access it through Inventory → Manage FBA Inventory → Inventory Age. This report shows the age in days per SKU and quantities within specific tiers like '181-210 days', '211-240 days', '241-270 days', and so on. Inventory Health Report: Use this to monitor aged inventory metrics and identify items for removal orders.

You should check these reports at least once a week. Since the assessment date is fixed on the 15th of each month, checking only once a month means you'll miss your window for action. Also, set your own thresholds in advance. Classify inventory over 150 days as aged stock for separate management, and treat anything over 300 days as a red flag requiring top-priority action. Seller Central also sends notifications for inventory approaching the surcharge assessment date, so simply paying attention to these alerts can speed up your response.

The FBA Revenue Calculator allows you to simulate total FBA costs, including monthly storage fees and the Aged Inventory Surcharge, in advance. Recalculate whether this product is still profitable, factoring in the current and projected fees.

150-180 Day Window: Selling is the Cheapest Disposal Method From a cost perspective, the most advantageous way to clear inventory is to sell it. Removal or disposal incurs fees and means losing the inventory entirely, but selling generates revenue. This makes the 150-180 day window your critical battleground.

During this period, actively leverage coupons, Lightning Deals, price reductions, and enhanced Amazon Ads campaigns. However, excessive discounts can erode your margins. Before setting your discount level, it's wise to calculate and compare "how much will this inventory cost me monthly if it enters the surcharge tier?" If the margin lost to a discount is less than the future surcharges you'd pay, selling is the winning strategy.

Removal, Liquidation, or Disposal: What to Choose? If sales promotions don't move your stock, you'll need to decide to remove it from the warehouse. You have three options:

Removal Order: Return inventory to your own warehouse, a supplier, or a 3PL provider. This is viable if there's potential to sell through other channels, but you must consider the total cost, including return shipping and handling fees. Note that recent policy changes have reduced removal fees for certain standard-sized items, so check current rates. Liquidation: Dispose of inventory through the FBA liquidation program. While recovery rates are low (typically 5-10%), it's a practical alternative to minimize losses if you don't have external storage after removal. Disposal: Abandon the inventory to stop future fees. This can be the most rational choice if the future costs outweigh the inventory's remaining value.

To create a removal order, go to Inventory → Manage FBA Inventory, select the items, and choose Create removal order from the Action on selected item dropdown. If managing this manually is difficult, you can set up automated removal or disposal for inventory older than a certain period by configuring Automated actions on the Inventory → FBA Inventory page under Fix stranded inventory.

Watch Out for Pitfalls in Disposal Orders When Fees Are Incurred: Removal and disposal fees are calculated when the order is submitted, but actual billing occurs when the items leave the fulfillment center. However, once an order is placed, those items will no longer incur monthly storage fees or the Aged Inventory Surcharge. While storage costs until removal are waived, the removal/disposal fee itself is still charged.

Processing Time: Fulfillment centers typically process disposal orders within 10-14 business days, but during busy periods like holidays, it can take 30 days or more. To avoid the 15th-of-the-month snapshot, you must factor in this processing time and place your order sufficiently early.

Per-Unit Cost Comparison: Removal and disposal fees are charged per unit and vary based on product size and weight. Compare the estimated disposal costs with the inventory's potential sales value (or possibility of selling through other channels) to choose the option that minimizes your losses.

What's Scarier Than Fees: IPI Score and Storage Volume Limits The problem of aged inventory doesn't just end with a bill. Excess and aged inventory can lower your IPI (Inventory Performance Index) score, and a low IPI can lead to FBA inventory storage volume limits. This creates a vicious cycle where unsold inventory takes up space, preventing you from sending in fast-selling products.

IPI is managed through four key factors: Lowering your Excess Inventory percentage, Increasing your FBA Sell-through Rate, Immediately resolving Stranded Inventory, and Maintaining an In-stock Inventory rate. Aim for a score of 400 or higher, ideally 550 or above.

Furthermore, unsold inventory ties up your capital. Money that could have been used for new product sourcing or marketing is locked away in the warehouse, meaning the actual loss is greater than just the billed fees.

The Best Strategy: Don't Create Excess Inventory in the First Place The ultimate solution is actually the first step: ordering. Maintain optimal inventory levels and adjust your reorder cycles based on demand forecasts to prevent inventory from being classified as excess for 90 days or more. Seller Central offers demand forecasting and restock recommendation tools that are worth utilizing. Amazon generally recommends maintaining approximately two months' worth of inventory in fulfillment centers. While ordering in bulk to lower unit costs can be tempting, you must factor in that this strategy can backfire with surcharges the moment inventory rotation slows down.

Before Counting 181 Days, Verify Your Inventory Counts All the calculations discussed so far rely on the quantities and measurements recorded in Amazon's system. However, I've personally encountered several instances where these baseline numbers were incorrect.

For example, I once sent in 1,000 units, but Seller Central showed 1,500. I contacted Seller Support to request an inventory reconciliation, and only after the investigation was completed were the correct quantities updated. The opposite has also happened. I sent 1,000 units, but only 500 were recorded, and I rectified it through the same process.

It wasn't just about quantities. For products in poly bags, the dimensions could vary depending on how the bag was measured, leading to inconsistent FBA fees for the same item—sometimes higher, sometimes lower. After an inventory reconciliation for this issue, I received a refund for the overcharged fees.

That's why I record the number of units I send in for each shipment and regularly cross-reference it with the report figures. If I had left inflated quantities uncorrected, the surcharge after 181 days would have been calculated for non-existent inventory. An invoice isn't just a document to pay and forget; it's a document where you can verify the basis and request corrections. Whether it's 180 days or 365 days, managing inventory tiers is only meaningful if your quantity data is accurate.

Common Seller Mistakes Confusing Long-Term Storage Fees with Aged Inventory Surcharges. The Aged Inventory Surcharge is a separate fee applied monthly, starting earlier at 181 days, based on the storage duration of individual inventory units. Believing a good IPI score guarantees safety. Even with a healthy IPI, if a specific SKU exceeds 181 days, the surcharge will still apply. Failing to regularly check reports. Without using the Inventory Age and Inventory Health reports, there's no way to proactively detect when inventory enters a risk zone. Missing the window for action. Delaying decisions means you'll act after the fees have already been assessed, and with processing times, you'll likely get caught in the next month's snapshot as well.

Action Checklist 1. Check your Inventory Age report (Reports → Fulfillment → Inventory Age) weekly. 2. Classify inventory over 150 days into a separate list, and prioritize anything over 300 days for immediate action. 3. For inventory in the 150-180 day window, first attempt sales liquidation using coupons, Lightning Deals, price discounts, and advertising. 4. Before setting discount levels, use the FBA Revenue Calculator to compare total costs (including storage and surcharges) to potential revenue. 5. If selling isn't feasible, calculate the costs for removal, liquidation, or disposal to choose the option that minimizes your losses. 6. Since disposal orders take 10-14 business days (or 30+ days during peak seasons) to process, create them well in advance by counting back from the 15th-of-the-month snapshot. 7. If manual management is challenging, set up Automated actions under Fix stranded inventory in Inventory → FBA Inventory. 8. Maintain an IPI of 400 or higher (ideally 550+), and regularly review your excess inventory, sell-through rate, stranded inventory, and in-stock inventory rate. 9. At the ordering stage, aim for an optimal inventory level and reorder cycle based on approximately two months' worth of stock in fulfillment centers. 10. Record your inbound quantities and regularly cross-reference them with report figures. If quantities, dimensions, or fees seem incorrect, request an inventory reconciliation from Seller Support.