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Clerk vs WorkOS vs Supabase Auth vs Auth0 vs Kinde in 2026: The Enterprise SAML SSO Tax on 80,000 Users

B2B SaaS authentication pricing looks completely harmless when you launch. At 10,000 free consumer users, almost every managed authentication provider—Clerk, Supabase Auth, WorkOS, Kinde, and Auth0—costs between $0 and $25/month.

Then your first mid-market or enterprise IT buyer shows up and mandates Okta or Azure AD (Entra ID) SAML 2.0 Single Sign-On (SSO) and SCIM 2.0 automated directory provisioning as a condition of signing a $15,000 annual contract.

Suddenly, your monthly authentication bill jumps from $25/mo to $599/mo, $1,200/mo, or $4,340/mo.

Let us break down the exact 2026 math behind the Enterprise SAML SSO Tax across Better-Auth, Kinde, Supabase Auth, WorkOS, Clerk, and Auth0 on a realistic hybrid SaaS workload.

1. Why the Enterprise SAML Cliff Happens

Managed identity providers monetize along two axes that rarely align with how modern PLG (Product-Led Growth) SaaS products grow:

  1. Plan-Tier Gating (The SAML Cliff): Some platforms lock SAML SSO behind a high-tier platform plan. For example, on Supabase, moving from Pro ($25/mo) to unlock SAML SSO requires upgrading to the Supabase Team Plan ($599/mo)—a $574/mo jump just to turn on your first enterprise SAML connection.
  2. Blended MAU + Per-Connection Metering: If you have 80,000 Monthly Active Users (or Monthly Retained Users) in a freemium product and only 5 enterprise orgs using SAML, providers that charge high per-MAU overages on top of enterprise base plans end up taxing your free users at enterprise rates.

2. The 2026 Enterprise SAML & MAU Simulation (80,000 Users + 5 SAML + 2 SCIM)

Let us run the exact monthly cost simulation for a hybrid PLG + B2B SaaS workload with:

  • 80,000 Monthly Active / Retained Users (MAUs / MRUs)
  • 5 Enterprise SAML SSO Connections (Okta, Entra ID, Google Workspace SAML)
  • 2 SCIM Directory Sync Connections
Auth Provider Base Plan Required MAU / MRU Overage (80k Users) SAML + SCIM Connection Fees Total Monthly Bill
1. Better-Auth (Self-Hosted OSS) $0.00/mo (Runs on your DB) $0.00 (Stored in your Postgres/SQLite) $0.00 (Built-in SSO/SAML plugin) $0.00/mo
2. Kinde Plus $75.00/mo (Includes SAML SSO) ~$347.50 (69.5k over 10.5k @ $0.005) $0.00 SAML included $422.50/mo
3. Supabase Auth (Team) $599.00/mo (Required for SAML) $0.00 (500k MAUs included on Team) $0.00 ($0.015/SSO MAU above 50) $599.00/mo
4. WorkOS AuthKit $0.00/mo (Free up to 1M MAUs) $0.00 (1,000,000 MAUs free) $625 SAML (5 x $125) + $250 SCIM (2 x $125) $875.00/mo
5. Clerk Business $300.00/mo (50k MRUs + 1 SAML) $600.00 (30k MRUs @ $0.02/MRU) $300.00 (4 extra SAML x $75) $1,200.00/mo
6. Auth0 B2B $240.00+/mo ~$4,100.00 (~$0.07/MAU blended) Tier-capped / Enterprise upgrade $4,340.00/mo

(Note on Clerk: If you have fewer than 50,000 MRUs, only need **1 SAML connection, and do not need SCIM or SOC2 audit logs yet, **Clerk Pro is just $25/month* because it includes 50,000 MRUs and 1 enterprise SSO connection).*

3. Three Architectural Rules to Avoid the Auth Tax

  1. Never Mix Free Consumer MAUs and Enterprise SAML Users in the Same High-Rate Tenant: If you use a legacy CIAM provider like Auth0, never store 80,000 free-tier users in the same B2B tenant where every MAU is billed at B2B rates.
  2. Match Your Provider to Your Growth Shape (Freemium vs Enterprise-Heavy):
    • If you have high free MAUs (100k to 1M) and only a few enterprise SAML customers, WorkOS AuthKit (free up to 1M MAUs, $125/mo per SAML connection) or Supabase Team ($599/mo including 500k MAUs) prevents runaway per-user bills.
    • If you have low MAUs (<50k) and 1 to 2 SAML customers, Clerk Pro ($25/mo + $75/mo per extra SAML) or Kinde Plus ($75/mo) keeps fixed overhead low.
  3. Evaluate Database-Backed Open-Source Auth (Better-Auth): When your application already runs on a managed Postgres or edge SQLite database, open-source TypeScript frameworks like Better-Auth store sessions, organizations, passkeys, and SAML SSO configurations directly in your own database tables for $0.00/month in third-party SaaS markups.

Download the 2026 SaaS Auth & Enterprise SAML/SSO Tax Dataset + CLI

To simulate your exact monthly auth bill across any combination of MAUs, SAML connections, and SCIM directory syncs, download the 2026 SaaS Auth, MAU & Enterprise SAML/SSO Pricing Cliff Dataset (CSV + JSON) + Node.js Cost Simulator CLI:

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