Fees checked October 25, 2026 against official pages

Keep More of Every Sale: the free 2026 reseller fee & profit guide

16 pages, straight to the point: what each marketplace really takes, how to price every item for profit, and 12 legal ways to pay less in fees. Every number is calculated, not guessed.

Where do you sell? (optional)

Enter your name and email, then download the PDF instantly. You also join the early-access list for the FlipMath profit tracker. No spam; unsubscribe any time.

What's inside

The 3 rules that decide what you keep

Which marketplaces charge on shipping and sales tax, why cheap items lose up to 30% to fees, and what ads really cost.

Cheat sheets for all 7 marketplaces

eBay, Etsy, Depop, Whatnot, Poshmark, Mercari and Grailed: every rate, the traps, and how to pay less on each.

Same item, 7 marketplaces

What you keep on a $20, $50, $100 and $250 sale on each platform, ranked.

The minimum price table

The lowest list price that still makes the profit you want, worked out to the cent for every marketplace.

12 legal ways to pay less

Price thresholds, labels, ads, stores and cash-outs, each with the dollars it saves.

Real profit and taxes

The 9 things to record for every sale, a 15-minute monthly review, and the 1099-K rules from the IRS.

Who it's for

US resellers selling on eBay, Etsy, Depop, Whatnot, Poshmark, Mercari or Grailed, from side hustlers to full-time flippers. If you've ever wondered why a sale paid less than you expected, start with chapter 2.