Updated May 2026
C3PAO Cost 2026: $30K to $200K+ Assessment Fees
Third-party assessor (C3PAO) fees for CMMC Level 2 cluster in three tier bands by company size and CUI scope. Phase 2 of 32 CFR Part 170 begins November 2026, making C3PAO certification mandatory for Level 2 contractors. Around 80 C3PAOs are currently authorised on the Cyber AB registry.
C3PAO fee tier bands
Three size bands cluster public C3PAO fee reports and practitioner write-ups. Quoted fees vary with engagement scope, asset count, CUI boundary complexity, and site count.
| Tier | Profile | Typical C3PAO Fee | Assessor Days |
|---|---|---|---|
| Small | Under 50 employees, single site, modest CUI scope, clean SSP | $30,000 - $50,000 | 5 - 8 |
| Mid | 50-200 employees, 1-2 sites, defined CUI scope | $50,000 - $80,000 | 8 - 15 |
| Larger | 200-500+ employees, multi-site, complex CUI scope | $80,000 - $200,000+ | 15 - 30+ |
Source pattern: public C3PAO engagement reports, Cyber AB registry composition, practitioner write-ups on LinkedIn and Reddit r/govcontracting. We do not publish per-firm pricing because most C3PAOs do not list fees publicly. See methodology.
What drives the variance
Assessor on-site days
Larger CUI boundaries take more days. Days are the primary cost lever; the daily rate is roughly stable across C3PAOs in a given tier.
Asset count to inventory
Every endpoint, server, network device, and SaaS environment in the CUI boundary requires evidence review. More assets equals more time.
CUI boundary clarity
A clean SSP that clearly defines what is in and out of scope reduces assessor scope-clarification time. A muddled SSP can add 20-40 percent to assessor effort.
Number of physical sites
Multi-site contractors pay for travel days plus per-site evidence review. Two sites typically adds 30-50 percent to a single-site baseline.
Evidence package quality
Pre-organised, indexed evidence reduces re-work cycles. Disorganised evidence can trigger additional assessor follow-up rounds at billable rates.
Prior NIST 800-171 maturity
Contractors with mature NIST SP 800-171 self-assessments (high SPRS scores) hit fewer findings during the C3PAO assessment, reducing remediation re-work loops.
Verifying a C3PAO before you engage
- Pull the official authorised C3PAO list from the Cyber AB. Confirm the C3PAO is currently authorised (not suspended, not pending reauthorisation).
- Confirm the lead CCA assigned to your engagement is on the authorised CCA roster.
- Check the C3PAO's conflict-of-interest declaration. A C3PAO cannot assess a contractor for which the C3PAO has also provided consulting, remediation, or implementation services within the relevant scope window. The Cyber AB COI rules disqualify mixed-role engagements.
- Ask for client references from a contractor of similar size and CUI profile. C3PAOs typically provide 2-3 references on request.
- Verify scheduling availability against your Phase 2 (November 2026) target. Current C3PAO scheduling backlogs run 6-12 months. Engagements not yet booked by mid-2026 may not assess before Phase 2 lock-in.
Reducing the assessment cost
The largest C3PAO-cost savings come from scope tightening before engagement rather than negotiating the daily rate.
Tighten the SSP
A defensible SSP that clearly draws the CUI boundary reduces assessor scope-clarification effort. Invest in SSP quality before engagement.
Cloud enclave to shrink boundary
Moving CUI to a dedicated cloud enclave (GCC High, Azure Government, or a CMMC-aligned platform) pulls assets out of the general IT estate and shrinks the assessment boundary. See remediation.
Pre-assessment readiness review
A readiness review (run by an RPO or internally) catches findings before C3PAO time-on-the-clock. Costs $5K-$25K but can save 20-40 percent on the C3PAO fee.
Indexed evidence package
Pre-organise evidence by NIST SP 800-171 Rev 3 requirement family. Reduces assessor evidence-hunt time, which is billable.