Every month, small discrepancies accumulate inside an FBA account: a shipment that checked in two cartons short, a fulfillment fee calculated at the wrong weight tier, a customer refund that never produced a reimbursement. Each line looks too small to chase on its own. Together, they become a persistent drag on margin that no dashboard flags. An FBA audit service is the systematic answer — a structured review of your settlements, inventory, and fees, built to find and recover what leaks.
This guide explains the three audits behind a professional FBA audit, what each one checks, and how the work actually gets done.
- Three audits cover the money: settlement, inventory, and fee audits each catch different leak types, and serious sellers run all three.
- The settlement report is ground truth — it records what Amazon actually charged and credited, not what you assumed would happen.
- Inventory audits catch shrinkage around inbound receiving, returns processing, and disposal events that Seller Central never surfaces proactively.
- Fee audits catch overcharges in fulfillment fees, storage fees, and dimension or weight classifications.
- Quarterly is the minimum cadence for most sellers; high-velocity catalogs justify monthly coverage.
- What Is an FBA Audit Service?
- Why FBA Accounts Leak Money Silently
- The Three Core Audits, Compared
- How Professionals Run an FBA Audit
- DIY vs. Hiring an FBA Audit Service
- Common Mistakes With FBA Audits
- FAQ
What Is an FBA Audit Service?
An FBA audit service is a systematic review of your Amazon settlement reports, inventory records, and fee charges, performed to find money Amazon owes you or has overcharged you. The output is not a vague health score — it is a line-item findings list where every entry carries report evidence and a specific recovery action.
The work sits at the intersection of bookkeeping and case management. Auditors reconcile three data layers against each other: what Amazon charged, what Amazon physically received and processed, and what your own records say should have happened. Where the layers disagree, there is usually recoverable money, or a process problem worth fixing on your side, or both.
Why FBA Accounts Leak Money Silently
Amazon's fulfillment network moves enormous volume, and its systems are built for speed, not for protecting any individual seller's margin. Units get miscounted at receiving. Returns get scanned as unsellable and disposed of without a reimbursement. A fee table update lands, and your best-selling SKU quietly starts billing at the wrong size tier.
None of these events generate an alert. Your payout simply arrives slightly lower than it should be, month after month. Because every discrepancy looks small and plausible in isolation, most sellers never investigate — which is precisely why a structured FBA audit earns its keep. The money is not hidden; it is scattered across reports nobody opens.
The Three Core Audits, Compared
A professional audit service splits the work into three passes, each with its own data sources and its own class of findings.
1. Settlement Audit
The settlement report is the definitive record of every charge and credit Amazon applied to your account. A settlement report audit rebuilds each payout from the transaction level and compares it against expectations: reimbursements that were approved in a case but never posted, duplicate charges, fees billed after an order was already refunded, and credits Amazon promised in writing but never issued.
2. Inventory Audit
The inventory audit reconciles what you shipped against what Amazon recorded as received, and what customers returned against what Amazon restocked or reimbursed. It draws on receiving records, inventory adjustment events, and removal and disposal records. This pass catches the classic phantom loss — units that vanished somewhere between check-in and sellable.
3. Fee Audit
An Amazon FBA fee audit verifies that the fulfillment, storage, and weight-handling fees charged for every ASIN match the actual measured dimensions and the current fee schedule. Audits of this type routinely find SKUs billed at the wrong size tier for months at a time. Correcting the classification fixes the future; reconciling the history recovers the past.
| Audit type | What it checks | Primary data sources | Typical findings | Suggested cadence |
|---|---|---|---|---|
| Settlement audit | Charges, credits, and reimbursements actually applied | Settlement reports, case logs | Missing reimbursements, duplicate fees, unissued credits | Monthly to quarterly |
| Inventory audit | Received vs. shipped units, returns vs. restocks and reimbursements | Receiving records, inventory adjustments, removal and disposal records | Lost inbound units, unreimbursed returns, premature disposals | Quarterly |
| Fee audit | Fulfillment, storage, and weight-handling fee accuracy | Fee previews, ASIN dimensions, storage fee reports | Wrong size tiers, stale dimensions, storage overcharges | Quarterly, plus after any fee schedule change |
How Professionals Run an FBA Audit
The mechanics are repeatable, which is what makes the service scalable:
- Pull the data. Export six to twelve months of settlement reports, reimbursement records, inventory adjustments, and fee reports from Seller Central.
- Rebuild expectations. Reconstruct what should have happened for each shipment, order, and ASIN from your shipment and catalog records.
- Flag exceptions. Match actuals against expectations and list every discrepancy above an agreed materiality threshold.
- Check claim windows. Sort findings by eligibility, because reimbursement claims must be filed within time limits that vary by claim type and have shortened over time.
- Build evidence packs. Attach shipment IDs, case IDs, and transaction references to each finding so a claim can survive review.
- File and track. Submit cases through Seller Central, log responses, and escalate rejections with the evidence already attached.
- Report and re-audit. Document what was recovered, what was rejected, and which process change prevents recurrence next period.
DIY vs. Hiring an FBA Audit Service
| Dimension | DIY audit | Professional FBA audit service |
|---|---|---|
| Time cost | Several hours per pass, mostly report wrangling | Near zero for you; the service owns the workflow |
| Coverage | Usually settlement-only, when time allows | All three layers, on a fixed cadence |
| Tools | Spreadsheets and patience | Reconciliation workflows built for report volumes |
| Follow-through | Claims often stall after the first rejection | Rejection handling and escalation are part of the job |
| Cost | Free in cash, expensive in hours | Percentage of recovery, flat fee, or bundled into a retainer |
DIY is viable for small catalogs with light shipment volume. Once inbound shipments, returns, and fee events pile up, exception handling tends to outgrow spreadsheet capacity, and the audit stops happening at all.
Common Mistakes With FBA Audits
- Auditing only the settlement report. It is the most convenient source, but it cannot show inventory that never entered a transaction at all.
- Waiting until year end. Claim windows are measured in months for many claim types, so a December audit finds last January's money already expired.
- Filing claims without evidence. Under-documented claims get rejected, and repeated weak submissions waste the account's credibility on cases that mattered.
- Treating an audit as a one-time fix. Leakage recurs as volume grows; a single audit clears the backlog but does not stop the drip.
- Ignoring sub-threshold discrepancies. A small fee error is not worth a case on its own, but the same error repeated across thousands of units is.
FAQ
How much does an FBA audit service cost?
Pricing varies. Some providers charge a percentage of recovered funds, others a flat fee, and full-service agencies often bundle audits into a monthly management retainer. Before signing, ask exactly what happens when a claim is rejected — that is where most of the real work lives.
How often should I audit my account?
Quarterly is a sensible minimum for most sellers. If you send inbound shipments frequently, run promotions, or manage a large catalog with many size tiers, monthly coverage catches problems while claim windows are still open.
Can I run an FBA audit myself in Seller Central?
Yes, for a small account. Export the settlement, reimbursement, inventory adjustment, and fee reports, then reconcile them in a spreadsheet. The constraint is time: the reconciliation grows with order volume, and it repeats every single period.
Will filing audit claims hurt my account health?
Legitimate, evidence-backed claims are a normal part of using FBA. What creates friction is bulk submission without documentation. If your account already has health issues, resolve those in parallel — our account health rating guide explains how Amazon scores accounts.
Is an audit the same as a recovery service?
No. The audit is the diagnostic; recovery is the follow-through that files, tracks, and escalates the claims the audit surfaces. Many services sell them together, which is usually the better value. For the recovery half, see our guide to FBA recovery services.
Next Step
An audit is the fastest way to learn whether your account is quietly leaking margin, and the findings usually fund the effort of finding them. Tim's Amazon Lab runs settlement, inventory, and fee reviews through its Cases & Reimbursements service line, with a dedicated account manager owning the follow-through on every account.
Want a professional pair of eyes on your account?
Tim's Amazon Lab offers a free account audit — a dedicated account manager reviews your account health, listings, and reimbursements, and tells you exactly what needs fixing. No contract, no pressure. Start your free audit →
Related Reading
- FBA Reimbursement Audit: How Professionals Find the Money Amazon Owes You
- Amazon Fee Audit: Finding the Fees You're Overpaying Every Month
- FBA Reimbursement Checklist
- A three-layer diagram showing the settlement, inventory, and fee audits feeding into one findings report. Alt text: "FBA audit service covering settlement, inventory, and fee audits".
- An annotated mock of a settlement report line with a missing reimbursement highlighted. Alt text: "settlement report audit finding a missing FBA reimbursement".
- A seven-step audit workflow graphic, from data pull to claim filing. Alt text: "professional FBA audit process steps from data pull to recovery".