What Is sso.tax?

sso.tax is a public list of software vendors that treat single sign-on (SSO) as a premium "Enterprise" feature rather than a baseline security requirement. It documents how much more you pay when SSO is gated behind a higher tier, and it exists to pressure vendors into including SSO in all plans or charging a reasonable amount for it. It's most useful if you're an IT or security lead evaluating vendors, or a founder trying to budget for SSO without jumping to an enterprise contract.

What the site actually tracks

The core of the site is a table of vendors with four data points per row:

• Vendor — the product being evaluated.
• Base Pricing — the cost of the plan most teams would otherwise choose.
• SSO Pricing — the cost of the tier that unlocks SSO.
• Increase — the percentage jump between the two, plus a source link and an "Updated" date.

The site also has sections for Price Increases and Quotes Required, and an FAQs section. "Quotes Required" matters because some vendors don't publish SSO pricing at all, which makes comparison harder and negotiation less transparent.

Why the percentage column is the point

The headline number is the multiplier, not the absolute price. A few examples from the site's table:

The site's own framing is that this "can inflate the cost by 3x, 5x, 10x, or more, forcing smaller companies to choose between a secure environment and an affordable budget." That trade-off is the thing the list is designed to make visible.

The argument behind the list

The site's stated position is that SSO is a core security requirement for any company with more than five employees. Its reasoning, in its own words:

• For users, SSO means one password (and maybe a security key) gets them everywhere.
• For IT and security teams, SSO is a single place to onboard, manage, and offboard users, and to centralize strong authentication, logging, and account recovery.
• For vendors, SSO shifts responsibility for exotic authentication requirements onto the SSO provider instead of the vendor.

From that, the site argues that gating SSO behind an "Enterprise" paywall — often bundled with unnecessary features or large minimum seat counts — "punishes growing businesses and encourages dangerous security shortcuts."

How to use it when you're evaluating a vendor

1. Find the vendor in the table and note the Base Pricing and SSO Pricing columns.
2. Check the Updated date. Pricing changes; a row from 2019 may no longer reflect current plans.
3. Follow the source link to confirm the current numbers on the vendor's own pricing page before you rely on them.
4. If the vendor appears under Quotes Required, treat SSO cost as unknown until you get a written quote — don't assume it's included.
5. Compare the increase against your seat count, since a per-user-per-month jump compounds with team size.

What to keep in mind

• The list is a snapshot with dates attached, not a live price feed. Always verify against the vendor's pricing page.
• A high percentage doesn't automatically mean a bad deal — a small absolute increase on a cheap plan can be fine. The percentage is a signal, not a verdict.
• The site's threshold claim ("more than five employees") is its own editorial position, not a formal standard.
• Absence from the list isn't proof a vendor includes SSO in every plan; it may just mean the site hasn't catalogued it.