Why 90 days
Ninety days is the shortest runway that reliably works, for two reasons. First, remediation lead time: the gaps that matter most to underwriters, such as MFA coverage on remaining accounts, backup immutability, and privileged access review, each take weeks to close properly, and your broker typically wants the completed submission two to four weeks before the renewal date. Second, drift: your environment has changed since last year's application. New SaaS tools, new admin accounts, a migrated backup platform, staff turnover. An answer that was true when it was signed may be false today, and application answers are representations the carrier relies on. What follows is the plan in three phases, plus a triage order if your renewal is closer than 90 days.
If you are renewing for the first time or facing a new carrier's form, read the cyber insurance questionnaire guide for what applications ask, and the requirements guide for what carriers expect control by control.