Key takeaway
Verification is the audit trail for your emissions data. It is also the single biggest credibility marker CDP recognises. A company that has third-party verified its emissions under ISO 14064-3 with reasonable assurance scores meaningfully higher than a company with the same emissions reporting unverified internally. This lesson explains the verification standards CDP recognises, the difference between limited and reasonable assurance, the verifier landscape, and how to plan a verification programme that scales with your CDP score ambitions.
What verification is and is not
Verification is independent third-party assurance that your emissions calculation is accurate and your methodology is consistent with the relevant standard. It is not:
- Internal review by your sustainability team
- Audit by your financial auditor (unless they are accredited verifiers and following an emissions verification standard)
- A signed statement from your CSO
Verification is performed by an accredited body (ANAB, UKAS, NABCB, or other national accreditation body) following an emissions verification standard.
The two main standards
CDP recognises several verification standards. The two most widely used:
| Standard | Issuer | Most-used by |
|---|---|---|
| ISO 14064-3 | International Organization for Standardization | Most large companies globally; Indian and Asian companies; manufacturing sectors |
| ISAE 3410 | International Auditing and Assurance Standards Board | Companies whose financial auditors do their emissions verification; financial services firms; European companies |
Other standards CDP recognises: AA1000 (used by some specialty providers), ASAE 3000 / ASAE 3410 (Australia), DNV's own verification framework, and national equivalents.
For most companies, ISO 14064-3 is the default choice. The methodology is comprehensive, the standard is internationally recognised, and the cost is reasonable.
Limited versus reasonable assurance
This is the most important distinction in the verification world.
| Assurance level | What it means | Effort required | CDP scoring impact |
|---|---|---|---|
| Limited assurance | The verifier confirms that nothing has come to their attention that would suggest the emissions data is materially misstated | Sample testing, methodology review, plausibility checks | Acceptable for Management tier; Leadership tier eligible |
| Reasonable assurance | The verifier expresses an opinion that the emissions data is fairly stated in all material respects | Substantive testing, recalculation, independent emission factor verification | Stronger Leadership tier signal; required by some regulations |
Reasonable assurance is roughly 2-3 times more expensive than limited assurance and takes longer. Most companies start with limited assurance and graduate to reasonable assurance over multi-year cycles.
Analogy
Limited assurance is like a credit check: the bank confirms there is no obvious red flag. Reasonable assurance is like a full underwriting: the bank verifies your income, employment, debts, and assets independently. Both are useful; one is more rigorous. CDP rewards both, with reasonable assurance scoring higher.
Coverage decisions
The verification statement covers specific scopes and emission categories. Coverage decisions matter for scoring:
- 100 percent of Scope 1 + Scope 2 is the typical floor for Management tier on Q7.16.
- Plus dominant Scope 3 categories (typically Category 1 and Category 11) is the Management tier standard.
- Plus full Scope 3 is Leadership tier.
The grader looks at the verification statement attached to your response and checks coverage explicitly.
The verifier landscape
CDP recognises a wide range of accredited verifiers. Common providers:
| Verifier | Strength |
|---|---|
| Big Four (KPMG, Deloitte, EY, PwC) | Cross-functional integration with financial audit; broad sector coverage |
| Bureau Veritas, DNV, TUV, BSI, SGS | Engineering depth; familiarity with manufacturing operations; ISO 14064-3 specialty |
| Mid-tier specialists (BDO, Grant Thornton) | Cost-effective for mid-size companies |
| Indian providers (TUV India, BV India, KPMG India, ERM India) | Local knowledge of Indian factors and regulations |
| CDP Accredited Solutions Providers | Specialty firms (some of which also verify); brand recognition with CDP |
The verifier you choose does not affect CDP scoring directly, as long as they are accredited. But practical considerations: cost, sector expertise, geographic coverage, and integration with your annual reporting cycle.
Q7.16 - What CDP wants in the verification disclosure
Q7.16 asks for the verification of your emissions, with several sub-fields:
- Verification status (verified, not verified, in progress)
- Scope coverage (which scopes and categories)
- Standard (ISO 14064-3, ISAE 3410, etc.)
- Level of assurance (limited or reasonable)
- Provider name
- Verification date
- Statement attached as evidence
A scoring-quality answer:
"Verified by KPMG India under ISO 14064-3, Limited Assurance level. Coverage: 100 percent of Scope 1, 100 percent of Scope 2 (location and market), 100 percent of Scope 3 Categories 1, 4, 6, 11, and 15. Verification statement attached, signed 12 June 2026 by KPMG India lead verifier. The verifier reviewed our methodology, sampled 18 facilities (representing 92 percent of Scope 1+2 emissions), and tested calculations against source documentation. Material assumptions and limitations noted in the statement: estimation uncertainty for Scope 3 Category 11 use-phase emissions estimated at +/- 18 percent."
This level of detail earns Leadership tier consideration.
Planning your verification programme
For a company starting from no verification, the multi-year build typically looks like:
-
Year 1. Verify Scope 1+2 only, limited assurance, with one provider. Cost: USD 30,000-80,000 depending on number of facilities. Score: Management tier on Q7.16.
-
Year 2. Add Scope 3 dominant categories (Category 1, Category 11) to verification, still limited assurance. Cost: additional USD 20,000-40,000 typically. Score: Management to Leadership tier.
-
Year 3. Move Scope 1+2 to reasonable assurance, keep Scope 3 at limited assurance. Cost: additional USD 30,000-60,000. Score: Leadership tier.
-
Year 4 and beyond. Maintain reasonable assurance on Scope 1+2, expand reasonable assurance to dominant Scope 3 categories. Add other categories as data quality matures.
The total annual verification spend for a mid-size company at Leadership tier is typically USD 100,000-200,000. Larger companies spend USD 500,000+ across global operations.
Worked example
InfraCorp India (synthetic). Three-year verification journey.
Year 1 (FY24). No verification. Q7.16 answered as "verification planned for FY26." Disclosure tier.
Year 2 (FY25). Verified Scope 1+2 only, limited assurance, by Bureau Veritas India, USD 45,000 cost. Q7.16 disclosure includes verifier name, standard (ISO 14064-3), assurance level, coverage. Statement attached. Management tier.
Year 3 (FY26). Same verifier, coverage extended to Scope 3 Categories 1, 4, 6, 11, plus Scope 1+2 unchanged at limited assurance. USD 65,000 cost. Plus internal preparation for Year 4 reasonable assurance. Management to Leadership tier.
Year 4 plan (FY27). Move Scope 1+2 to reasonable assurance under ISO 14064-3, keep Scope 3 at limited assurance. Estimated cost: USD 95,000.
The CFO has approved the multi-year budget for verification. The Sustainability Committee at the board reviews verification scope annually before contracting.
This is a credible verification programme. The grader treats the multi-year build as evidence of serious commitment.
Common pitfalls
- Verifying without attaching the statement. Saying "verified" without uploading the verification statement is the most common point loss. The grader cannot give credit for evidence they cannot see.
- Internal "verification" passed off as third-party. This is a serious problem if discovered. Internal review is not verification; the grader differentiates clearly.
- Verifying the inventory but not the methodology. The verification statement should cover both data accuracy and methodology consistency with GHG Protocol.
- Verification scope shrinking year-on-year. If your Year 2 verification covers fewer categories than Year 1, the grader treats this as backsliding.
Three trends are pushing verification costs up: (1) regulatory expansion (CSRD requires reasonable assurance over time, IFRS S2 introduces assurance expectations), (2) Scope 3 verification becoming standard in addition to Scope 1+2, and (3) verifiers themselves charging more as demand grows. Companies budgeting for verification should expect 10-20 percent annual cost increases through 2027. Locking in multi-year contracts at fixed rates is increasingly common.
Key Takeaways
- ISO 14064-3 and ISAE 3410 are the two main verification standards CDP recognises; ISO 14064-3 is the default for most companies
- Limited assurance is the entry level; reasonable assurance is more expensive but a stronger Leadership-tier signal
- Coverage matters: 100 percent of Scope 1+2 is the floor for Management tier; adding dominant Scope 3 categories is needed for Leadership
- Verification cost for a mid-size company at Leadership tier is typically USD 100,000-200,000 annually
- Always attach the verification statement; saying 'verified' without evidence does not earn credit
Knowledge Check
Test what you just learned
6 questions · check each one as you go
Which is the most widely-used emissions verification standard?
What is the difference between limited and reasonable assurance?
True or false: 'Verification' by your internal sustainability team is acceptable to CDP as third-party assurance.
Which is the typical floor for Management-tier verification coverage?
Which is the most important pitfall to avoid?
Match each verifier type to a typical strength.
Match each item to its pair
Big Four (KPMG, Deloitte, EY, PwC)
Bureau Veritas, DNV, TUV, BSI, SGS
Mid-tier specialists (BDO, Grant Thornton)
CDP Accredited Solutions Providers