| Months 0-2: Scope & Gap Analysis |
Define ISMS scope (which systems, processes, locations). Perform gap analysis vs ISO 27001:2022 Annex A. Assign CISO or responsible owner. Executive sign-off on Statement of Applicability (SoA) draft. |
CTO + Security lead: 30–50 hours. Optional consultant: 20–30 hours. |
₹5–15K (consultant gap analysis) |
Scoping too broadly (entire company vs core product). Larger scope = longer audit, higher cost. |
| Months 2-5: ISMS Build & Policy Writing |
Draft all mandatory policies: Information Security Policy, Risk Assessment & Treatment, Acceptable Use, Asset Management, Access Control, Incident Response, Business Continuity, Supplier Security. Complete formal Risk Assessment (identify assets → threats → vulnerabilities → risk score → treatment plan). |
0.5 FTE security engineer full-time. 60–80 policy documents required. |
₹20–40K (tooling, templates, consultant review) |
Copy-pasting generic policy templates without customising to your environment. Auditor will ask "show me this in practice" and it won't match. |
| Months 5-7: Annex A Controls Implementation |
Implement 93 Annex A controls (ISO 27001:2022). Key technical controls: encryption, MFA, vulnerability management, logging, network segregation. Key organisational controls: background checks, NDA, supplier contracts, security training, change management, VAPT. |
0.5–1 FTE engineering + operations. Parallel workstreams recommended. |
₹15–35K (VAPT, background checks, tooling) |
Treating Annex A as a checklist instead of a risk-driven exercise. Auditor asks "why is this control relevant?" You need documented justification in Statement of Applicability. |
| Months 7-8: Internal Audit & Management Review |
Conduct internal audit of ISMS (all policies + controls tested). Present findings to top management (Management Review meeting — mandatory for ISO). Document corrective actions. Complete final Statement of Applicability (SoA). |
Internal auditor or consultant: 40–60 hours. Management: 4–8 hours. |
₹15–30K (internal auditor or consultant) |
Skipping Management Review. ISO specifically requires evidence that top management reviewed ISMS performance. Missing = automatic nonconformity. |
| Months 8-9: Stage 1 Audit (Documentation Review) |
External certification body reviews all ISMS documentation. Confirms scope and SoA are complete. Issues list of gaps to address before Stage 2. Stage 1 is a desk audit — auditor does NOT visit site yet. |
Internal team: 20–30 hours preparing documentation package for auditor. |
₹15–25K (Stage 1 audit fees) |
Submitting incomplete documentation. If SoA is missing justifications or Risk Treatment Plan is vague, Stage 1 will fail and delay Stage 2 by 1–3 months. |
| Months 9-11: Remediate Stage 1 Findings & Prepare for Stage 2 |
Fix all gaps identified in Stage 1. Ensure controls have been operating for minimum 3 months (evidence required). Conduct final pre-Stage 2 mock audit. Prepare evidence packs for all Annex A controls. |
Internal team: 30–50 hours. Consultant review recommended. |
₹10–20K (consultant, tools) |
Not having 3+ months of evidence that controls actually worked. Auditor will request logs, reports, meeting minutes from previous 3 months. No evidence = nonconformity. |
| Months 11-12: Stage 2 Audit (Certification Audit) |
On-site (or remote) deep audit. Auditor interviews key staff. Tests controls in practice. Reviews access logs, backup records, incident logs, training records, supplier contracts. Issues audit report with conformities and nonconformities. |
Internal team: 40–60 hours actively supporting auditor over 3–5 days. |
₹30–60K (Stage 2 audit fees) |
Staff not prepared for interviews. Auditor will ask engineers "how do you request access to production?" If answer contradicts the policy document, it's a nonconformity. |
| Months 12-13: Resolve Nonconformities & Get Certificate |
Certification body issues findings: Major nonconformities (must fix before certificate), Minor nonconformities (fix within 90 days). Submit corrective action evidence. Receive ISO 27001 certificate (3-year validity). |
Internal team: 20–40 hours addressing findings. |
₹0 (included in audit fee) |
Major nonconformity on a core control (e.g., no formal risk assessment). Delays certificate by 1–3 months. Cannot use certificate for enterprise deals until issued. |
| Year 1–3: Surveillance Audits |
Annual surveillance audits (Year 1 and Year 2). Lighter than initial certification audit. Auditor checks ISMS is still operating, nonconformities remediated, continual improvement demonstrated. Full recertification audit in Year 3. |
Ongoing: 10–15 hours/month ISMS maintenance + 20–30 hours per annual surveillance audit prep. |
₹15–30K/year (surveillance audit fees) + ₹30–60K in Year 3 (recertification) |
Treating ISO as "done" after getting certificate. Surveillance auditor will ask "show me your continual improvement log." No improvements logged = certificate at risk of suspension. |