>>distan+ok
To be fair - if the SSO tax was just a single SKU for adding _just_ SSO to the platform and it was a reasonable like $2 - $4 a user addition, most people wouldn't care. When we refer to the SSO tax what we normally mean is that SSO is gated into the "Enterprise" category of a tool for some reason, implying that only Enterprises use SSO. The difference usually also includes other tools that the customer doesn't need (we only want SSO) and so the price difference is usually huge. It makes SSO unrealistic for non-enterprise size customers.
IMO thats generally what people refer to when they say SSO tax. It isnt discounting that providing SSO requires work, its that its never decoupled from a huge platform upsell.