Here is a list of what I call the "big five" when it comes to third party selling websites and the fees for each. All use some form of retail payment processing AKA managed payments. Fees are only part of the decision to choose a site to sell on.
Ebay charges (in most categories) 12.95% plus 30 cents final value fee on the total the buyer paid including item price, shipping and sales tax. No fee to list if you use a basic listing and keep within your listing limits.
Amazon final value fees average 15% plus 99 cents of the sale price plus shipping if you don't have a store plus $1.80 if you sell a book (per transaction fee). Their fees range from 8-45% and is charged on the total amount paid to the seller. They do not charge fees on sales tax. No fee to list. They charge 7 cents to print a shipping label (at least they used to a few years ago).
Mercari charges 10% on the sale price plus shipping plus 2.9% plus 30 cents processing fee, so 12.9% plus 30 cents. No fee to list. They don't specifically state that fees are charged on sales tax, but the 2.9% fee applies to the total amount the buyer pays, so I assume that is what is charged on the sales tax. Their FAQ is not clear.
Poshmark charges $2.95 final value fee for sales under $15 and 20% for anything higher than $15. No fee to list. Their FAQ makes no mention whether fees are charged on sales tax or shipping.
Etsy charges a listing fee of 20 cents per listing. Final value fees are 6.5% paid on the sale price plus shipping plus final value fees that vary depending on country. For the US, final value fees are 3% plus 25 cents, so 9.5% plus 25 cents. If you sell from the US or Canada, fees are not charged on sales tax. If you sell from outside the US or Canada, fees do apply.
The easier you are to offend the easier you are to control.
We seem to be getting closer and closer to a situation where nobody is responsible for what they did but we are all responsible for what somebody else did. - Thomas Sowell
