Introduction:
Shopify and Amazon sellers often put all their energy into boosting sales. But many discover too late that sales growth without proper bookkeeping leads to cash flow problems, tax penalties, and even business collapse. Here are the three most common mistakes e-commerce sellers make — and how to avoid them.

1. Mixing Personal and Business Expenses
Many sellers swipe the same card for personal and business purchases. This creates messy records, confuses tax deductions, and can trigger IRS issues. Keeping separate bank accounts and credit cards is essential.

2. Ignoring Landed Costs
Most sellers record only product purchase price as cost of goods sold. They ignore shipping, customs duty, and packaging costs. Without landed cost tracking, reported margins are inflated — owners may think they’re profitable when they’re not.

3. Neglecting Sales Tax Compliance
In the U.S., sales tax compliance is complex. Each state has different rules, and sellers often cross nexus thresholds without realizing it. Not collecting/remitting sales tax can lead to huge penalties.

Conclusion & CTA:
Clean bookkeeping is not optional — it’s the foundation of sustainable e-commerce growth. With proper accounting, sellers can understand true profitability, plan inventory, and stay compliant.
👉 RBC Global Advisors provides specialized bookkeeping and CFO services for Amazon and Shopify sellers, so you can scale confidently.