Amazon Selling in 2026
Why Your ERP Integration Matters More Than Your Product Catalog
You’ve watched Amazon grow from online bookstore to retail titan. What you might not realize is how dramatically the requirements for succeeding on the platform have shifted—especially if you’re operating at mid-market scale.
Amazon now represents roughly 40% of all US eCommerce, with gross merchandise value approaching $540 billion annually (eMarketer, 2025). Third-party sellers account for 62% of units sold on the platform (Amazon Q3 2025 Investor Relations), which sounds like an opportunity … until you look at what’s required to operate profitably at scale.
The businesses winning on Amazon in 2026 aren’t just listing products. They’re managing SKU-level profitability across fee structures that rival tax codes in complexity, maintaining inventory velocity that satisfies Amazon’s performance metrics, and coordinating fulfillment across multiple marketplaces from unified inventory. If you’re running operations in spreadsheets or disconnected systems, you’re competing with one hand tied behind your back.
The Fee Complexity That Destroys Margins Without Warning
Amazon’s fee structure has evolved into a multi-layered system that punishes operational inefficiency with surgical precision.
The Inbound Placement Service Fee (launched March 2024) charges between $0.21 and $6.00 per unit, depending on product size and how you distribute shipments across Amazon’s fulfillment network (BrandsBro, 2025). Send everything to one fulfillment center, and you’ll pay premium rates. Distribute optimally across Amazon’s network, and you’ll pay less, but you need data infrastructure to make those decisions.
The Low-Inventory-Level Fee hits sellers maintaining less than 28 days of supply at $0.89 to $1.11 per unit sold (AMZ Prep, 2026). This creates tension with the aged inventory surcharge that starts accumulating at just 181 days (previously 365). You’re penalized for having too little inventory and too much, with a narrow window in between that requires constant monitoring.
Returns processing fees now apply when your products exceed category-specific return rate thresholds. Dimensional weight pricing affects 66% of packages (Red Stag Fulfillment, 2025). Storage fees vary by season, product size, and inventory age.
Here’s the challenge: you can’t assess true product profitability without tracking every fee at the SKU level. That Amazon sales report showing $50,000 in revenue? By the time you subtract referral fees (8-15% depending on category), FBA fees, placement fees, storage fees, advertising costs, and miscellaneous charges, you might be operating at 5-10% net margins or negative margins on slow-moving SKUs.
Your ERP system should calculate this automatically. If it’s not connected to your Amazon data, you’re flying blind.
Inventory Management Requirements Have Reversed Completely
Amazon’s Inventory Performance Index (IPI) now governs your storage limits and fee structure. You need a score above 400 to avoid capacity restrictions, with scores of 500+ unlocking storage fee discounts (Jungle Scout, 2025).
This has flipped inventory strategy on its head. The “just-in-case” stockpiling that made sense during supply chain chaos now costs you thousands in aged inventory fees while tanking your IPI score. Best practice has shifted to maintaining 30-60 days of supply with frequent smaller replenishments every 3-4 weeks.
But here’s what makes this operationally complex: you need to forecast demand accurately enough to maintain that narrow inventory window, coordinate with your purchasing team on smaller batch production runs, and time shipments to avoid stockouts—all while Amazon’s fee structure punishes both understocking and overstocking.
You can’t do this well without automated demand forecasting that factors in seasonality, promotional activity, and actual sell-through rates. Your gut instinct about what to order worked when you had 50 SKUs. At 500+ SKUs across multiple marketplaces, you need systems doing the math.
The Multi-channel Reality: Amazon Is One Piece Of Your Distribution Puzzle
New seller registrations on Amazon hit a decade low in 2025, with only 1.9 million active sellers out of 9.7 million total registered accounts (Marketplace Pulse, 2025). That’s not because opportunity disappeared—it’s because competition intensified and operational requirements increased.
Chinese sellers now represent 59.9% of new Amazon registrations and approximately 48.9% of third-party revenue share (Marketplace Pulse, 2025). You’re competing against sellers with significantly lower cost structures and sophisticated operations.
The response isn’t to abandon Amazon—it’s to expand beyond it. Omnichannel shoppers deliver 30% higher lifetime value than single-channel buyers, and sellers see average 22% revenue growth in first 60 days of multi-channel expansion (Shopify Multi-Channel Report, 2024).
Walmart Marketplace added over 200,000 active sellers in 2025, with 44,000 joining in just the first five months (Cross-Border Magazine, 2025). TikTok Shop generates $1.1 billion in monthly US GMV with referral fees of just 5-6% compared to Amazon’s category-specific rates (TikTok Commerce Report, 2025).
You can’t manage this expansion manually. Each platform has different fee structures, fulfillment requirements, and inventory sync protocols. Oversell on Walmart because your Amazon inventory count was stale? That’s a policy violation and negative customer experience that damages your seller rating.
Why Advertising Costs Now Determine Profitability
Amazon’s advertising revenue reached $56.2 billion in 2024, growing 18-20% year-over-year (Sequence Commerce, 2026). That growth comes from sellers like you who’ve discovered that organic ranking alone no longer drives sufficient traffic.
Average cost-per-click sits at $0.99 to $1.04, with seasonal peaks reaching $1.14 (Canopy Management, 2025). Average Advertising Cost of Sales (ACoS) is 30.20%, with top performers achieving 22-25%. The recommended Total Advertising Cost of Sales (TACoS) benchmark for healthy brands is 10-18%, depending on category.
Here’s the operational challenge: you need to track advertising spend at the SKU level, measure true profitability after all fees and ad costs, and make decisions about which products to promote, maintain, or discontinue. If your financial system doesn’t integrate advertising data with inventory costs and fee structures, you can’t calculate actual product margins.
That’s why sellers operating at scale need their PPC data feeding into the same system that manages inventory, purchasing, and financial reporting. Without integration, you’re making decisions based on incomplete information.
Multi-Channel Fulfillment: Using FBA Inventory For All Your Sales Channels
Here’s a capability that changes the multi-channel equation: Amazon Multi-Channel Fulfillment (MCF) lets you use your FBA inventory to fulfill orders from Shopify, Walmart, TikTok Shop, and other platforms.
MCF offers $3.64 per item for shipments of 4+ items, with 93% US zip code coverage for same/next-day delivery (Amazon MCF, 2025). You get FBA’s logistics infrastructure without requiring customers to buy on Amazon.
But here’s the operational complexity: you need your ERP to route orders intelligently. When an order comes in from Shopify, Walmart, BigCommerce, WooCommerce, or Magento, should it fulfill from FBA via MCF, from your warehouse, or from a third-party logistics provider? The answer depends on product dimensions, destination, inventory levels across locations, and your fulfillment cost thresholds.
Suite Engine’s Channel Sales Manager (CSM) handles this orchestration within Business Central. When a Walmart order comes in, CSM can automatically route it to MCF if the item exists in FBA inventory, or to your warehouse if it doesn’t. You’re not logging into multiple systems to manage fulfillment; you’re managing unified inventory with intelligent routing.
The Financial Reconciliation Nightmare Amazon Creates
Amazon settlement reports contain over 50 different transaction types—sales, refunds, FBA fees, storage fees, advertising charges, reimbursements, chargebacks, and more (Versa Cloud ERP, 2025). Each requires transformation and categorization before posting to your financial system.
The timing misalignment makes this worse. An order placed on January 15th might ship on January 17th, but not appear in your settlement report until January 24th when Amazon processes the payout. Your customer already received the product, but from an accounting perspective, you can’t recognize revenue until the settlement processes.
Amazon also holds account-level reserves and implements Day+7 payment delays for new or high-risk sellers (introduced November 2024) (EZ Integrations, 2025). Your actual cash flow doesn’t match your sales reports, which creates forecasting challenges if you’re relying on marketplace dashboards instead of your ERP.
Finance teams using automated Amazon-to-ERP integration report 90% reduction in manual reconciliation time (EZ Integrations, 2026). That’s not just efficiency—it’s accuracy. Manual reconciliation introduces errors that compound over time, creating discrepancies between your marketplace activity and your books.
What Business Central Integration Actually Solves
Channel Sales Manager (CSM) connects Business Central with Amazon, Shopify, BigCommerce, Magento/Adobe Commerce, WooCommerce, and Walmart (released April 2025). Here’s what that integration enables:
Unified inventory management: You maintain one source of truth for inventory across all channels. When you sell a unit on Amazon, your Shopify available quantity updates automatically. When you receive a purchase order in Business Central, all connected channels reflect the new stock level.
Automated order processing: Orders from any marketplace flow into Business Central as sales orders, triggering your existing fulfillment workflows. You’re not manually entering Amazon orders into your ERP; the integration handles it.
Comprehensive fee tracking: All Amazon fees post to appropriate general ledger accounts in Business Central with transaction-level detail, giving you the financial data needed to analyze profitability.
Financial reconciliation automation: Amazon settlement data posts to the correct GL accounts automatically, with transaction-level detail that makes reconciliation straightforward instead of a monthly ordeal.
Multi-channel fulfillment orchestration: Orders from Shopify, Walmart, BigCommerce, WooCommerce, or Magento route to FBA, MCF, or your warehouse based on business rules you define. Customer location, product characteristics, inventory availability, fulfillment costs, and delivery speed requirements all factor into automated decisions.
Bi-directional refunds and returns: When a customer initiates a return on Amazon, CSM creates the corresponding credit memo in Business Central and updates inventory. Your financial records stay synchronized with marketplace activity.
This isn’t about having “better data”—it’s about operating at a scale and complexity level that manual processes can’t support. When you’re managing 1,000+ SKUs across four marketplaces with different fee structures, promotional schedules, and fulfillment requirements, integration is the difference between profitable growth and operational chaos.
What This Means For Your Amazon Strategy
If you’re considering Amazon as a sales channel, or if you’re already selling but managing everything manually, here are the operational questions that determine success:
Can you calculate true product profitability after all fees and advertising costs? If not, you might be losing money on products that appear profitable in Amazon’s dashboard.
Can you maintain optimal inventory levels (30-60 days of supply) across multiple SKUs without constant manual calculation? If not, you’re paying unnecessary storage fees or losing sales to stockouts.
Can you fulfill orders from other marketplaces using your FBA inventory without manual intervention? If not, you’re either maintaining duplicate inventory across fulfillment locations or missing the multi-channel opportunity.
Can your finance team reconcile Amazon settlements without multi-day manual processes? If not, you’re diverting valuable resources from analysis to data entry.
These aren’t theoretical questions. They’re the operational requirements that separate sellers who scale profitably from those who plateau or exit the platform after discovering hidden costs.
Where To Start
If you’re using Business Central and considering Amazon or already selling on marketplaces, start by assessing your current integration approach:
Manual processes: Exporting CSV files from marketplaces and importing to Business Central creates lag, introduces errors, and doesn’t scale beyond a few dozen orders daily.
Basic API connections: Direct API integrations require ongoing maintenance as marketplaces change their specifications, and often lack the business logic needed for complex fulfillment scenarios.
Purpose-built middleware: Solutions like Channel Sales Manager (CSM) are designed specifically for the Business Central + marketplace combination, with pre-built logic for common scenarios and ongoing updates as platforms evolve.
You can explore CSM’s capabilities through AppSource or request a demonstration focused on your specific marketplace mix and operational requirements. The question isn’t whether integration provides value—it’s whether you’re capturing that value now or leaving it on the table while competitors gain operational advantages.
Amazon represents a significant eCommerce opportunity in 2026, but that opportunity requires operational sophistication that manual processes simply can’t deliver. Your product catalog gets you in the door. Your systems determine whether you stay profitable as you scale.
Related Resources:
- The Great eCommerce Shift
- What an eCommerce Business Really Gains from ERP Integration
- The Secret Life of eCommerce Orders and Inventory
- Why Your Inventory Counts Never Match
- Multi-Channel eCommerce Order Management in Business Central
- The Power of CSM Notifications: Enhancing BC
- CSM Item Variations
- Channel Sales Manager for Business Central
- CSM Feature Updates and Capabilities
Questions about integrating Business Central with Amazon or other marketplaces? Contact Suite Engine’s team to discuss your specific operational requirements and explore whether CSM addresses your current challenges.
