What is the difference between an audit, review, and compilation?

A plain-English guide for choosing the right financial statement service before a lender, board, investor, or regulator asks for it.

The decision framework

Start with the report user. A lender, investor, board, grantor, or regulator may specify exactly what they need. If they require an audit, a review or compilation will usually not satisfy the requirement.

If no one has mandated a report, the decision should weigh risk, cost, assurance level, timeline, and how the financial statements will be used.

How the services compare

  • Audit: highest level of assurance in this group, with testing, risk assessment, and an auditor opinion.
  • Review: limited assurance using inquiry and analytical procedures.
  • Compilation: financial statements prepared or presented by a CPA without assurance.
  • Agreed-upon procedures: specific procedures and findings for users who agree on the scope.

What to gather before scoping

  • The lender, investor, board, or regulator request.
  • Prior financial statements and prior CPA reports.
  • Trial balance, general ledger, bank reconciliations, debt schedules, and supporting records.
  • Deadlines, intended users, and whether comparative periods are required.
Source-Backed Notes

Assurance level matters before the engagement starts

Audit, review, compilation, and agreed-upon procedure work should be scoped around the report users, required assurance level, records available, and applicable professional standards.

Bottom Line

What is the difference?

Short answer: an audit provides reasonable assurance, a review provides limited assurance, a compilation provides no assurance, and agreed-upon procedures report specific findings for a defined scope.

  • Choose based on report users and required assurance level.
  • Reviews and compilations are not substitutes for an audit when an audit is required.
  • AUP engagements can answer narrow questions without opining on the full financial statements.

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