Platform choice is the lead decision
E-commerce cost starts with the platform. Shopify, Ikas, Ideasoft, T-Soft and WooCommerce subscription fees range widely in 2026; transaction fees and paid apps are on top.
Custom builds (Medusa, Saleor or custom Next.js) require higher upfront but eliminate long-term license drag.
Theme, payment and marketplace line items
Stock themes are cheap to free; custom theme design is a separate budget. Payment integrations (iyzico, PayTR, Stripe) are their own integration work.
Trendyol, Hepsiburada, N11, Amazon connections are per-marketplace integration. ERP connectors (Logo/Netsis) add another line item.
Don't forget operations
Monthly e-commerce operations often cost more than the site itself: shipping, packaging, customer service, advertising, content and returns handling.
Projects that don't plan a 'launch + 6 months of operations' budget hit cash stress by month three.
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