Guides

The thinking behind the calculators: how each fee schedule really works, how to price for profit, what the loan numbers mean. Every guide is dated, cites its sources, and links to the calculator that does the arithmetic.

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Sales tax for online sellers: marketplace facilitator laws explained

Who collects sales tax when you sell on eBay, Etsy or Mercari, when you have to collect it yourself, what nexus means, and how to back tax out of a receipt.

Everyday · 23 Sep 2026 · 5 min read