Substantiation answers a simple question for the controller and the auditors: can we prove every number on the balance sheet? In practice, teams assign each account an owner, a risk rating and a required frequency. High-risk accounts like cash and accruals get reconciled monthly, while low-risk accounts may be certified quarterly. The output is a complete, signed-off inventory of evidence that stands up in an audit or a SOX review.
The term became common after Sarbanes-Oxley pushed public companies to formalize close controls. Today many private mid-market companies adopt the same discipline before an IPO or a debt raise, because unsupported balances are one of the first things diligence teams find.
In software: BlackLine and FloQast both provide substantiation dashboards that show certification status across every account, with risk-based rules for how often each account needs review. Numeric offers similar coverage aimed at teams moving off spreadsheet trackers.
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