What changed
A dated log of every fee update, correction and new calculator added to Reselling Math, newest first.
Updated
September 21, 2026
Added seven fee guides — the cross-platform fee-base comparison, Whatnot's tier table, a dated log of fee changes, promoted and boosted listings, an eBay Store break-even table, what "free shipping" does to each platform's fee, and a decision procedure for picking where to list.
September 19, 2026
Launched with eBay, Mercari, Poshmark, Whatnot and Depop fees checked against each platform's help pages. Whatnot's tiered commission (from September 21, 2026) is built in.
Get an email when a marketplace changes its fees
When eBay, Mercari, Poshmark, Whatnot or Depop changes a seller fee and we update the calculators, we send one short email saying what changed. Nothing else.