ERP for Amazon & Marketplace Sellers

An ERP for Amazon and marketplace sellers has to do one thing above all: bring stock, orders, fees and taxes together across multiple channels in real time, without forcing you to maintain a separate silo for every marketplace. If you sell on Amazon, eBay, Otto or Kaufland and mix FBA and FBM in the process, you quickly lose track of available stock, actual margin and the correct VAT without a central system. This guide shows you, vendor-neutrally, which requirements an ERP has to cover in the marketplace business and how to tell during selection whether a system can really handle your channel mix.

Why marketplace sellers need a specialised ERP

Selling through a marketplace is fundamentally different from the classic web-shop business. You don't sell on a platform you own, but under someone else's rules: the marketplace dictates interfaces, fee models, shipping requirements and return windows. As soon as you run several channels in parallel, the complexity multiplies – identical items sit in different listings, partly in your own warehouse, partly in the marketplace's fulfillment centre.

A pure accounting or shop back end hits its limits here. An ERP for multichannel retail bundles item master data, stock, orders, payments and tax logic in a single data base and syncs it with every connected channel. It's exactly this single source of truth about your stock and your numbers that is the real value – not any individual feature.

FBA and FBM: two fulfillment models, one ERP

Amazon sellers decide per item whether Amazon or they themselves ship. Both models place different demands on your system, and most sellers run a mix of the two.

Fulfillment by Amazon (FBA)

With Amazon FBA, your goods are stored in Amazon's logistics network, and Amazon handles shipping, customer service and first-line returns. For your ERP that means: the stock physically sits outside your warehouse but still has to remain visible. The system needs Amazon's inventory reports to separate FBA stock from your own warehouse and still map the fulfillment status per channel correctly. Storage fees and long-term storage fees also feed into the calculation.

Fulfillment by Merchant (FBM)

With Amazon FBM, you ship yourself from your own warehouse. Here your ERP has to map the classic chain: import the order, generate picking and a shipping label, feed tracking back, and meet the delivery times Amazon prescribes. The upside: full control over packaging and stock. The price: the operational effort sits with you, and shipping shortfalls feed straight through to your seller metrics.

A viable system treats both models not as an exception but as parallel stock locations within the same item – otherwise your numbers drift apart.

Multichannel stock: avoiding overselling

The biggest operational risk in marketplace retail is selling goods that no longer exist. As soon as the same item sits on several channels, every sale has to reduce the available stock of all other listings immediately.

Real-time stock synchronisation

Stock synchronisation is the heart of it. When one channel sells a unit, the ERP has to update the available-to-promise stock across all channels within seconds. Synced with delay or errors, overselling results: you confirm orders you can't fulfil. The consequences are cancellations, negative reviews and – on Amazon – worse seller metrics up to account suspension. So watch for webhook- or event-based synchronisation instead of slow time intervals, and for a safety-stock buffer per channel.

Buy Box and the repricing environment

On Amazon, several sellers compete for the same listing. Whoever wins the Buy Box gets the bulk of the sales. Price, delivery time and seller metrics all play a part. The actual repricing is usually handled by specialised tools, but your ERP provides the foundation: reliable purchase prices and cost data, so dynamic price changes never fall below your contribution-margin floor. Check whether your system interacts cleanly with repricing solutions via an interface instead of rigidly overwriting prices.

Fees and settlement: making the true margin visible

Marketplaces settle in complex ways: sales commissions, FBA fees, storage costs, advertising costs and refunds don't appear per order but bundled in payout reports. If you only book the sales price, you don't know your real margin.

A good ERP imports the marketplace settlements and allocates fees to individual orders or items. That way you see the actual contribution margin per SKU – including commission, shipping and return costs. Important for accounting: a marketplace payout is a net amount after fees, but has to be recorded gross as revenue and separately as expense. Resolving this commission settlement cleanly is a prerequisite for GoBD-compliant, auditable bookkeeping.

Tax: OSS, VAT and e-invoicing

As soon as you sell cross-border within the EU, VAT becomes a core topic. For distance sales to private customers in other EU countries, an EU-wide threshold of 10,000 euros has applied since July 2021. Once it's exceeded, you owe the VAT in the country of destination – reportable centrally via the One-Stop-Shop procedure (OSS), so you don't have to register separately in every country. If you use FBA warehouses abroad, additional cross-border transfers and local registration obligations arise that OSS doesn't cover.

Your ERP therefore has to tag deliveries correctly by destination country, customer type and storage location with the right tax rate and tax code, and evaluate OSS-relevant turnover separately. For domestic B2B sales, e-invoicing comes on top: in Germany, the obligation to receive electronic invoices in the format under EN 16931 (such as XRechnung or ZUGFeRD) has applied since 1 January 2025. The obligation to issue follows in stages – from 1 January 2027 for companies with more than 800,000 euros in prior-year turnover, and from 1 January 2028 for all domestic B2B invoice issuers. When in doubt, clarify cross-border tax matters with your tax advisor.

Returns as a process in their own right

In marketplace retail, returns aren't an edge case but a core process with high rates – especially on Amazon with its customer-friendly return policy. Your ERP has to map a return end to end: record the return, inspect the goods and, depending on their condition, put them back into stock or write them off, reconcile the refund with the marketplace and update the stock.

With FBA, Amazon handles first-line returns and reports them back; your system has to process these returns and the associated refunds so that stock and figures line up. Structured returns management prevents returned but unbooked goods from leading to wrong availabilities and renewed overselling.

What to look for when choosing an ERP

The following checklist helps you measure candidates from the ERP directory against your marketplace requirements:

• Native channel connections – existing connectors to Amazon, eBay, Otto, Kaufland instead of expensive custom development.
• Real-time stock synchronisation with channel-specific safety stock against overselling.
• FBA and FBM handling as parallel stock locations within the same item.
• Fee import from marketplace settlements with allocation per order.
• Tax logic for OSS, destination-country tax rates and e-invoicing.
• End-to-end returns management including FBA returns.

In the DACH region, several systems focused on retail and marketplaces have established themselves, for instance xentral, Billbee, plentyONE, JTL or weclapp. Which one fits depends on your order volume, your channel mix and your manufacturing depth – compare the profiles in the ERP finder. Since marketplace connectivity is technically demanding, a guided integration is often worthwhile for a clean channel and tax setup.

Conclusion

An ERP for Amazon and marketplace sellers stands or falls on its ability to steer multiple channels through a shared data base: real-time stock against overselling, clean FBA/FBM handling, fee-adjusted margins, correct OSS and e-invoicing logic, plus an end-to-end returns process. There is no single best system across the board – what matters is how well a candidate meets exactly these requirements for your specific channel mix. Whoever aligns the selection with this checklist instead of feature lists finds the system that truly holds up in day-to-day operations.