The biggest challenge is tracking cost of goods sold accurately when you never touch the product. Every sale needs a matching supplier cost so your profit margins reflect reality. When you’re processing dozens or hundreds of orders a day through different suppliers with different pricing, it’s easy for COGS to get lumped together or estimated instead of tracked per transaction. That makes your profit and loss statement unreliable.

Selling on multiple platforms creates another layer of complexity. Shopify, Amazon, eBay, and Walmart each calculate fees differently. Platform commissions, payment processing fees, advertising costs, and fulfillment charges all get deducted before you receive a payout. If you only look at what hits your bank account, you’re missing the full picture of revenue and expenses. Each platform needs to be reconciled separately, and their payout reports don’t always match what your accounting software expects.

Payout timing is a constant headache. A customer buys something on Monday, but the platform doesn’t deposit funds until the following week. Meanwhile, you’ve already paid your supplier. Your bank balance, your sales records, and your supplier payments are all on different timelines. Without proper accrual tracking or at least a clear system for matching transactions, your books will always feel off.

Sales tax compliance gets complicated fast. E-commerce businesses that ship to multiple states often trigger economic nexus thresholds, meaning you owe sales tax in states where you have no physical presence. Each state has different rules, different rates, and different filing frequencies. Missing a registration or filing deadline leads to penalties that add up quickly.

Refunds and chargebacks need careful handling too. A refund isn’t just reversing a sale. You need to account for whether the platform refunded their fees, whether the supplier issued a credit, and whether shipping costs were absorbed. Chargebacks add dispute fees on top of the lost revenue. Each one needs to be recorded correctly or your books won’t balance.

International suppliers introduce currency conversion differences. You might pay in US dollars, but if your supplier invoices in another currency, exchange rate fluctuations affect your actual costs. Small differences on individual orders add up over thousands of transactions.

The common thread across all of these challenges is volume. A handful of orders a month is manageable. But most dropshippers scale quickly, and the bookkeeping complexity scales with it. Getting systems in place early, using proper integrations between your sales platforms and accounting software, and working with a small business bookkeeping service that understands e-commerce can prevent months of cleanup work down the road.