That’s also on top of Stripe Checkout (0.5%) and on top of Stripe Radar (0.5%). Stripe cuts about 5% of every SaaS in the end. That’s a lot of money.
I am no Stripe pricing authority, and have no relation to the company, but I'm pretty sure that is *not* what she said.
She said that Checkout does not have an additional cost on top of transactions fees, not that Tax does not have an additional cost.