IAASB ISA cost depends on your scope, auditor choice, and whether you use compliance automation. The ranges below are 2026 market benchmarks. ISAs govern financial statement audits. Audit fees are borne by the audited entity and vary by company size. Small company audits may cost $10K-$50K; large multinational audits can cost millions.
Overall Cost Range
Expect $10,000 – $500,000 all-in, with the spread driven by company size, scope breadth, and auditor tier.
Budget Tiers
| Approach | Estimated Cost | When It Works |
|---|---|---|
| DIY with automation | $6,000 – $12,000 | Startups and small teams with capable in-house ownership and a compliance automation platform. |
| Mid-market | $10,000 – $255,000 | Growing companies combining automation with a consultant for policy and risk work. |
| Enterprise | $300,000 – $600,000+ | Multi-entity, multi-region programs with top-tier certification bodies and dedicated GRC headcount. |
Where to Cut Cost
- Scope aggressively. One product, one BU, one region first. Expand after you have the baseline.
- Use a compliance automation platform. Evidence collection accounts for a large share of consultant hours.
- Get three auditor quotes. Prices for identical scopes vary 2–3×.
- Bundle adjacent frameworks. If you need two, do them together — 70–80% of the controls overlap for most pairings.
Where Not to Cut Cost
- Risk assessment. Framework-based audits turn on it; a thin assessment leads to findings at the audit stage.
- Internal audit / self-assessment. Required by most frameworks and the main early-warning signal before the formal audit.
- Senior engineer time. Compliance work needs people who can speak to the architecture — not an admin task.
Browse Related
See the full IAASB ISA certification process and when and why to pursue IAASB ISA. To compare auditor firms, see the auditor directory.