Amazon FBA Inventory Accounting 2026: Stock Valuation, COGS & FBA Inventory Guide

What Is Amazon FBA Inventory Accounting?

Amazon FBA inventory accounting is the process of tracking, valuing, reconciling, and reporting the stock you send to Amazon fulfilment centres. When you sell through Fulfillment by Amazon, Amazon stores your products, picks and packs orders, ships to customers, and handles many returns. Your accounting still remains your responsibility: you must know how many units you own, what each unit cost, when that cost becomes cost of goods sold, and what value remains on the balance sheet at month end or year end.

The biggest mistake many sellers make is posting every supplier invoice directly to expenses. That may feel simple, but it can destroy gross margin accuracy. Inventory is normally a current asset until a unit is sold. Only after the sale should the related product cost move from inventory to COGS. That timing is what allows your profit and loss report to match revenue with the correct product cost.

For a growing Amazon business, clean FBA inventory accounting supports cash-flow planning, pricing, SKU profitability, tax preparation, and financing. It also connects with other bookkeeping areas such as Amazon settlement reconciliation, Amazon fee tracking, SKU profitability analysis, and tax preparation support for online sellers.

What Costs Make Up Amazon FBA Inventory Value?

The starting point for Amazon FBA stock valuation is landed cost. Landed cost means the full cost required to bring inventory to the location and condition needed for sale. For most sellers, this is more than the supplier invoice. It includes product cost, supplier freight, import duty, inbound freight, inspection, prep, labelling, packaging required before FBA check-in, and other directly attributable costs.

In plain English, inventory cost should answer this question: “What did it cost to get this sellable unit ready and available for Amazon FBA?” The cleaner this calculation, the more reliable your Amazon FBA COGS and SKU margin reports become.

• Product purchase price — the unit cost charged by the manufacturer, wholesaler, distributor, or brand owner.
• Import duty and customs charges — non-recoverable duties and tariffs paid to bring goods into your selling country.
• International freight — ocean freight, air freight, freight forwarder fees, port charges, and delivery from supplier to destination.
• Domestic inbound freight — shipping from your warehouse, prep centre, 3PL, or supplier into the Amazon fulfilment network.
• Prep, labelling, bundling, and inspection — FNSKU labels, poly bags, bubble wrap, quality checks, cartons, and bundle assembly where required for sale.
• Non-recoverable taxes — taxes that cannot be reclaimed and are directly related to acquiring inventory.
• Currency conversion costs — exchange differences and payment fees where they are part of the actual purchase transaction.

Amazon FBA Inventory Stock Valuation Methods 2026

Once you know what costs belong in inventory, the next decision is your stock valuation method. This method determines which cost is moved into COGS when a unit sells. Amazon does not choose this for you. Your business, accountant, accounting standard, and software setup determine the method.

The three common methods are FIFO, weighted average cost (often called AVCO), and specific identification. For Amazon FBA sellers with interchangeable units, FIFO and weighted average are the practical options. Specific identification is usually reserved for unique, high-value, individually trackable products.

1. FIFO for Amazon FBA Inventory Accounting

Under FIFO inventory accounting, you assume the first inventory purchased is the first inventory sold. This often fits physical stock movement because older batches should usually leave the supply chain before newer batches, especially for dated, seasonal, or version-sensitive products. FIFO can also make ending inventory closer to recent purchase prices when costs are rising.

Example: You buy 100 units in January at £5.00 per unit and 100 units in February at £6.00 per unit. In March you sell 120 units. Under FIFO, your COGS uses the oldest costs first:

• 100 units × £5.00 = £500 COGS
• 20 units × £6.00 = £120 COGS
• Total COGS = £620
• Remaining inventory = 80 units × £6.00 = £480

2. Weighted Average Cost / AVCO for FBA Sellers

Under weighted average cost, you calculate a blended average cost per unit. If new stock arrives at a different cost, the average is updated. This method is often easier where products are identical and units are mixed together inside Amazon’s fulfilment network.

Using the same example, 100 units at £5.00 and 100 units at £6.00 create 200 units at an average cost of £5.50. If 120 units sell, COGS is 120 × £5.50 = £660 and remaining inventory is 80 × £5.50 = £440.

3. Specific Identification for Unique Amazon Inventory

Specific identification means matching the exact cost of a specific item to the exact sale of that item. It is suitable for rare collectibles, refurbished electronics, jewellery, artwork, luxury goods, or individually serialised items. It is usually not practical for private-label sellers moving hundreds or thousands of identical units through FBA.

FIFO vs Weighted Average vs Specific ID — Side-by-Side

Amazon FBA COGS Accounting: How Inventory Moves to Expense

COGS means Cost of Goods Sold. In Amazon seller accounting, COGS is the product cost assigned to units sold during the period. It should not include every Amazon fee. It is focused on the inventory cost of the units that left stock because of sales. Fees such as referral fees, fulfilment fees, storage, advertising, refunds, and software should be recorded in separate expense categories so you can see true gross margin and true operating profit.

If your books show high sales but no COGS, profit is overstated. If you expense all purchases immediately, profit may be understated during heavy restock months and overstated during months where you sell older inventory. Good FBA inventory accounting gives you a cleaner picture month by month.

Journal Entry When Stock Is Purchased

When you buy stock, the entry should normally debit an inventory asset account. If you use a stock-in-transit account, goods can sit there until Amazon or your 3PL confirms receipt. A simple purchase entry is: Debit Inventory Asset / Credit Bank or Accounts Payable.

Journal Entry When Stock Is Sold

When units sell, your inventory tool or bookkeeper should move the cost from the balance sheet to the profit and loss account: Debit COGS / Credit Inventory Asset. This is where your chosen valuation method matters.

Journal Entry for FBA Inventory Write-Offs

If units are destroyed, lost without reimbursement, expired, or unsellable, record the cost as an inventory write-off: Debit Inventory Write-Off Expense / Credit Inventory Asset. If Amazon later reimburses you, record that reimbursement separately so it does not inflate ordinary sales revenue.

FBA-Specific Inventory Accounting Challenges in 2026

Inventory Spread Across Multiple Amazon Fulfilment Centres

Amazon may distribute your FBA stock across multiple fulfilment centres. For accounting, you normally value the total inventory you own, not each Amazon warehouse separately. The key is to reconcile total units owned, units received, units sold, units returned, removals, disposals, and reimbursements.

Inbound Placement and Freight Costs

Many sellers now pay more attention to inbound placement, shipping routing, Amazon Global Logistics, 3PL handling, and prep-centre costs. Some of these costs may be part of landed inventory cost when they are directly connected to bringing inventory into sellable FBA condition. Others may be operating expenses. Treat the policy consistently and ask your accountant when the amount is material.

Amazon FBA Reimbursements

Amazon may reimburse sellers for lost or damaged inventory. Do not automatically record every reimbursement as sales. The cleaner approach is to first remove the lost inventory cost from the inventory asset account, then record the reimbursement in a separate income or recovery account. This keeps gross product sales, COGS, and reimbursement income easier to understand.

Returns, Resellable Stock, and Unsellable Stock

Customer returns complicate FBA accounting because a returned unit may become sellable, customer-damaged, carrier-damaged, defective, or disposed of. If returned inventory is sellable, it may go back into stock. If it is unsellable, you may need to write it down, remove it, liquidate it, or record a disposal. Your monthly checklist should compare returned units with the accounting treatment applied.

Stranded Inventory and Listing Problems

Stranded inventory is stock that cannot currently be purchased by customers because of listing, pricing, compliance, or fulfilment issues. It may still be your inventory asset, but it needs review. If the listing will be fixed quickly, the stock may remain at cost. If the product is obsolete, restricted, damaged, or unlikely to sell above cost, you may need an NRV write-down.

Multi-Currency FBA Inventory

Sellers buying from China, paying suppliers in USD, selling in the UK, expanding to the EU, or operating a US entity must be careful with exchange rates. Inventory purchases should be recorded in your functional currency using a consistent exchange-rate policy. Keep supplier invoices, payment records, freight invoices, import documents, and FX charges together so landed cost can be supported later.

Lower of Cost or Net Realisable Value for Amazon Inventory

Year-end inventory is not only about counting units. You also need to ask whether inventory is still worth at least its recorded cost. Under common accounting principles, inventory should not be carried above the amount expected to be recovered from sale. In practical FBA language, compare your unit cost with what you realistically expect to receive after Amazon selling costs.

Net Realisable Value (NRV) for an Amazon SKU can be estimated by starting with the expected selling price and subtracting the costs necessary to sell the item. These costs may include referral fees, fulfilment fees, closing fees, expected discounts, and disposal or liquidation costs where relevant.

If NRV is lower than inventory cost, the difference is normally recorded as a write-down expense. Review slow-moving stock, suppressed listings, seasonal products, expired goods, damaged units, stranded inventory, and SKUs where pricing has dropped because of heavy competition.

Monthly Amazon FBA Inventory Accounting Workflow

A reliable monthly workflow is more useful than a once-a-year cleanup. The goal is to close each month with inventory quantities and inventory value that agree with your purchase records, Amazon reports, and accounting software.

1. Download Amazon settlement and inventory reports

   Collect settlement reports, inventory ledger movements, received inventory, reimbursements, removals, returns, and storage or aged inventory reports from Seller Central. Keep the files in a monthly folder.

2. Match purchase orders and supplier invoices

   Confirm what was ordered, what was shipped, what was received, and what costs belong to each SKU. Attach freight, duty, prep, inspection, and inbound shipping costs to the correct batch.

3. Calculate landed cost per SKU

   Build a landed cost sheet or use inventory software. Allocate shared freight and duty by quantity, weight, volume, or product value using a reasonable and consistent basis.

4. Update inventory quantities

   Reconcile opening inventory plus purchases and returns against sales, removals, disposals, adjustments, and ending units. Investigate unexplained differences before closing the month.

5. Post COGS using your chosen valuation method

   Use FIFO or weighted average consistently. Post COGS to the correct month so revenue and product cost are matched.

6. Record reimbursements and write-offs

   Separate reimbursements from product sales. Write off lost, destroyed, expired, or unsellable units where appropriate, then record any recovery separately.

7. Review slow-moving and stranded inventory

   Check aged inventory, suppressed listings, price drops, and products near expiry. Decide whether to hold, reprice, remove, liquidate, bundle, or write down.

8. Reconcile accounting software to inventory records

   Make sure the inventory asset balance in Xero or QuickBooks agrees with your inventory valuation report after journals have been posted.

How to Record Amazon FBA Inventory Accounting in Xero or QuickBooks

Accounting software should show the financial result, but it may not be enough by itself to manage every SKU, shipment, landed cost layer, and Amazon inventory movement. Many sellers use a combination of accounting software, a settlement tool, and an inventory system.

Recommended Chart of Accounts

Xero Setup Notes for FBA Sellers

Xero can work well for Amazon sellers when it receives clean settlement summaries and properly coded inventory journals. For basic sellers, COGS may be posted monthly from a landed cost schedule. For larger sellers, connect Xero to tools that can produce SKU-level or batch-level inventory values. Keep your Xero for Amazon sellers setup simple: inventory asset, COGS, Amazon fees, ad spend, reimbursements, refunds, and sales tax/VAT should not be mixed together.

QuickBooks Setup Notes for FBA Sellers

QuickBooks Online can track products, but many FBA sellers outgrow native item tracking once they add landed cost, multiple marketplaces, bundles, returns, and Amazon adjustments. Use a separate inventory system where needed and post summarized monthly journals into QuickBooks. See our QuickBooks for Amazon sellers guide for settlement and chart-of-accounts setup.

Inventory Accounting Tools for Amazon FBA Sellers

The best tool depends on your sales volume, number of SKUs, marketplaces, bundles, manufacturing complexity, and whether you sell beyond Amazon. Do not choose software only because it has a popular name. Choose the tool that can produce reliable inventory quantities, landed cost, COGS, and reconciliation reports.

UK, US, and International Notes for Amazon FBA Inventory Accounting

This guide is written for ecommerce sellers who want practical bookkeeping clarity, not formal tax advice. Rules vary by country, entity type, accounting framework, and tax filing method. A UK limited company, a US LLC, and an international seller operating multiple marketplaces may all need different reporting treatment.

• UK sellers: FIFO and weighted average are commonly used under UK/IFRS-style inventory principles. Keep VAT, import VAT, duty, and reclaimable taxes separate from true product cost.
• US sellers: Inventory accounting must clearly reflect income and should be consistent from year to year. Ask a US tax professional before using LIFO or changing inventory methods.
• EU sellers: Watch cross-border VAT, import rules, stock movements, and marketplace reporting. Inventory accounting and tax reporting may not be the same thing.
• Global sellers: Use a consistent exchange-rate policy and keep supplier, freight, customs, and Amazon marketplace records in one audit-ready file.

Amazon FBA Inventory Accounting Checklist for 2026

Use this checklist before you close each month or send records to your bookkeeper. It helps prevent the common mistakes that create wrong profit reports, missed reimbursements, and year-end cleanup bills.

• Inventory asset account is separate from COGS and Amazon fees.
• Landed cost policy includes product cost, freight, duty, prep, inspection, and inbound shipping where appropriate.
• FIFO or weighted average method is documented and applied consistently.
• Purchase orders and supplier invoices are matched to received inventory.
• Stock in transit is recorded when goods are paid for but not yet received.
• Monthly sales units are matched with COGS units.
• Amazon reimbursements are recorded separately from ordinary product sales.
• Returns and unsellable stock are reviewed before closing the month.
• Removals, disposals, and liquidations are recorded correctly.
• Slow-moving, stranded, and price-dropped SKUs are reviewed for write-downs.
• Inventory valuation report agrees to the balance sheet inventory account.
• Supporting reports are saved for tax preparation and future due diligence.

Common Amazon FBA Inventory Accounting Mistakes

Expensing All Inventory Purchases Immediately

This is the classic seller mistake. If you buy £50,000 of stock in June but sell it across July to December, expensing everything in June makes June look terrible and later months look too profitable. Inventory should normally sit as an asset until sold.

Mixing Amazon Fees With COGS

Referral fees and FBA fulfilment fees are important, but they are not the same as product cost. Keep them in separate accounts so gross margin, contribution margin, and net profit can be analysed properly.

Ignoring Reimbursements

FBA reimbursements can be easy to miss or code incorrectly. Treat them as recoveries, not normal sales, and make sure the lost or damaged inventory is also removed from stock value.

Not Reviewing NRV

Dead stock, seasonal products, restricted listings, and heavy competition can reduce recoverable value below cost. If you do not review NRV, your balance sheet may show inventory you cannot realistically recover.

Changing Methods Without Documentation

Switching between FIFO, average cost, and manual estimates can distort profit. If a change is necessary, document the reason, date, effect, and approval from your accountant.

FAQ: Amazon FBA Inventory Accounting 2026

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