SellersOS
SELLERSOS LLC
Amazon Profit Analytics & Fee Auditing
SellersOS Profit Analytics delivers instant, accurate financial clarity for high-volume Amazon sellers. By synchronizing directly with Amazon Selling Partner API (SP-API) Financial Events, Orders, and Settlement Reports, SellersOS calculates true contribution margin for every SKU, order, and marketplace — accounting for COGS, referral fees, FBA fulfillment costs, storage fees, returns, and advertising spend.
Figure 1: SellersOS Financial Command Center — Real-time P&L, Contribution Margin, and SKU Economics
1. Real-time unit economics & net margin
Traditional accounting spreadsheets rely on delayed bi-weekly settlement reports. SellersOS provides hourly financial visibility by reconciling order-level revenue against all variable and fixed cost structures:
- Automated Cost of Goods Sold (COGS): Flexible landed cost assignment per SKU and batch, supporting FIFO and weighted average valuation methods.
- Comprehensive Amazon Fee Breakdown: Itemized calculation of Referral Fees, Variable Closing Fees, FBA Weight-Based Fulfillment Fees, and High-Volume Listing Fees.
- Return & Refund Analytics: Accurate deduction of refund administration charges, unsellable customer returns, and inventory restocking fees.
- Net Profitability Cockpit: Instant visualization of Gross Revenue, Net Revenue, Contribution Margin 1 (CM1), and Contribution Margin 2 (after ad spend).
2. FBA lost inventory & fee reimbursement audits
Amazon fulfillment centers process millions of units daily, occasionally resulting in damaged goods, lost shipments, or incorrect dimensional weight tier classifications. SellersOS automatically audits your FBA account telemetry:
| Audit Category | Detection Mechanism | Reimbursement Action |
|---|---|---|
| Lost Warehouse Inventory | Continuous cross-comparison of FBA Inventory Ledger versus inbound shipment receipts | Identifies uncredited units missing for > 30 days eligible for Seller Central claim |
| Damaged in Warehouse | Reconciles warehouse damage status codes against processed reimbursement disbursements | Flags discrepancies where Amazon damaged units without issuing compensation |
| Customer Return Discrepancies | Monitors refunded buyer orders where physical units were not returned within 45 days | Generates itemized claim documentation with Order IDs and transaction records |
| FBA Fee Overcharges | Tracks historical changes in Amazon ASIN cubic dimensions and weight tier brackets | Alerts sellers to remeasurement opportunities when dimensional fees spike unexpectedly |
3. Blended TACoS & advertising attribution
Evaluating advertising in isolation leads to unprofitable scaling. SellersOS unifies Amazon Ads API data with organic sales:
- True Total Advertising Cost of Sales (TACoS): Tracks ad spend as a percentage of total revenue at both store and individual ASIN levels.
- Organic Lift Telemetry: Evaluates whether Sponsored Products campaigns are cannibalizing organic orders or driving incremental velocity.
- Break-Even ROAS / ACoS Targets: Dynamic target calculation based on exact SKU profit margins to prevent bidding into negative margins.
4. Multi-marketplace currency conversion
For brands operating internationally across North America (US, Canada, Mexico) and Europe (UK, Germany, France, Italy, Spain):
- Automated FX Conversion: Live currency rates convert foreign sales into your primary reporting currency (USD, EUR, GBP).
- Cross-Border Fulfillment Fees: Tracks Pan-EU, Remote Fulfillment with FBA (NARF), and European Fulfillment Network (EFN) surcharge fees accurately.
5. Zero Buyer PII architecture
In strict accordance with the Amazon Selling Partner API Data Protection Policy (DPP):
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