Derek Okonjo-Williams is an E-commerce Bookkeeper who specializes in the unique accounting challenges of online retail.

With expertise in multi-channel revenue recognition, inventory accounting, marketplace reconciliation, and sales tax compliance, Derek provides bookkeeping that actually understands how e-commerce works. In 2026, Derek employs e-commerce-native accounting workflows that integrate directly with sales channels and payment processors. His methodology includes automated revenue recognition from multiple marketplaces, real-time inventory costing, and automated sales tax calculation and reporting across all jurisdictions. Derek's knowledgebase encompasses e-commerce platform accounting (Amazon, Shopify, eBay, Walmart), marketplace fee structures, FBA/3PL inventory accounting, and multi-state sales tax nexus requirements. He maintains clean books that accurately reflect the true economics of your e-commerce operation including proper handling of returns, chargebacks, and marketplace fees. For e-commerce businesses struggling with the complexity of multi-channel selling, Derek provides specialized bookkeeping that captures every revenue stream, properly accounts for fees, and keeps you sales tax compliant across all states where you have nexus.