Ad-free, mathematically rigorous guides on payment gateway pricing, marketplace seller fees, interchange regulations, and small business tax optimization.
Comprehensive fee breakdown comparing domestic card rates, in-person POS hardware, dispute fees, and international transaction costs for online merchants.
Compare seller commissions and net payouts across top resale platforms. Learn how Mercari and Depop's 0% models compare to Poshmark's $15 threshold and eBay's Final Value Fees.
State-by-state credit card surcharge compliance, card brand disclosure rules, Durbin Amendment caps, and exact mathematical formulas for reverse fee invoicing.
Discover when growing merchants should graduate from flat 2.9% + $0.30 rates to wholesale interchange-plus pricing. Detailed volume thresholds and card brand assessments explained.
How Shopify's additional transaction fees work when using external gateways like Authorize.net or PayPal, and how high-volume stores can optimize their payment architecture.
Tax guide for e-commerce sellers, freelancers, and small businesses on writing off merchant processing fees, reconciling IRS 1099-K forms, and avoiding audit traps.