The pre-IPO audit prep timeline runs 18 to 24 months from your first planned public filing, driven by SOX 404 readiness, ICFR documentation, and a PCAOB-registered Big Four audit. At $50M to $200M ARR, the monthly close compresses to 3 to 5 days. Indinero, in continuous operations since 2009, supports specific workstreams here, R&D credits, multi-state tax, and audit-defensible GAAP books, not the audit itself.