Episode 02 · Amazon FBA Fee Auditor
I built the n8n workflow that catches the $2K–$5K/month Amazon FBA leaks most DTC brands never check.
Misclassified dimensions, weight-tier mismatches, refunds that don’t refund the fulfillment fee, long-term storage charges on items not old enough to qualify. The workflow audits all four automatically, every month.
One month of sample data — $97 in misbilled fees surfaced from 5 errors. Annualize for a $10M+ FBA brand: $5K–$30K/year.
Four fee errors this workflow catches
Wrong size tier
Amazon bills your Small Standard item at Large Standard rates. Per-unit overcharges compound across catalog.
Weight tier overcharge
Your 12oz item gets billed in the 16oz+ tier. Common when Amazon’s scale data drifts from your declared weight.
Refund without fee refund
Customer returns the item. Amazon doesn’t refund the fulfillment fee. Silent leak on every return.
LTS on too-new SKUs
Long-term storage fee billed on items below the 271-day threshold. Rare but expensive when it hits.
What you get
The n8n JSON
9 nodes, ready to import. Drops straight onto your existing n8n instance.
Setup guide (PDF)
1-page quick start. Where to put files, how to point at your real Amazon settlement.
Sample data
23 settlement rows + 12 SKUs with 5 intentional fee errors. Test before connecting to your live data.
The audit logic
60 lines of JavaScript that catch all four error types. Modify the fee schedule for your category.
Know when the next episode drops
One email per new workflow. Nothing else.
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Want this audit running on your actual Amazon settlement data?
I install and customize this workflow for DTC brands doing $2–15M ARR on FBA. Fixed-scope, fixed-price, 2 weeks. Pays for itself in the first month for most brands at this scale.
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