Gross vs profit, the 2026 federal $20K/200-transaction threshold, the states that stayed at $600, what deducts, and the 15-minute system that ends January panic.
TikTok Shop, Facebook Marketplace, eBay, Poshmark, Mercari, Whatnot and Etsy seller fees in one honest table — with the math on a $40 sale.
What a death pile really costs, why it forms, and a listing system that actually clears it — from a fellow accumulator.
Sourcing trips and meetup drives are deductible at 72.5–76 cents per mile in 2026. Here's the math, the split-year gotcha, and how to log it painlessly.