Choosing an auditor requires more than comparing fees. Begin by stating what needs to be audited, the reporting framework and the intended financial year. A statutory accounts audit, a financial review for management and transaction diligence have different objectives. If proposals describe different work, their prices cannot be compared meaningfully until the scope and deliverable are aligned with the company's actual requirement and timetable.
Verify the proposed auditor or audit firm's appropriate registration and ability to perform the engagement in Spain. The ROAC register is central to that check. Identify who will take responsibility and sign the report. An impressive brand, foreign qualification or long relationship with the company does not, by itself, establish that the proposed engagement satisfies the applicable Spanish authorisation requirements for this particular assignment.
Ask how independence is assessed, including existing accounting, advisory, commercial or personal relationships. Provide complete information about connected entities and services already received. Independence is a substantive requirement, not a sentence added to the quotation. The auditor must consider relevant threats and applicable restrictions. Management should not assume that using a separate employee within the same provider automatically resolves every issue created by another service.
For a hypothetical family company seeking its first audit, one proposal comes from a provider already preparing the accounts. The directors disclose that relationship and request a clear independence assessment before considering the offer further. Another proposal is cheaper but omits significant components. The comparison therefore examines eligibility, scope and resource assumptions before deciding whether either fee represents the work the company actually needs.
Review the practical terms: information required from management, expected communication, timetable, responsibility for group components and treatment of additional work. Ask how significant findings and proposed adjustments will be discussed. Avoid demanding a promised unmodified opinion as part of selection. A credible proposal explains the engagement process; it cannot guarantee the conclusion before the necessary audit evidence has been obtained and evaluated by the auditor.
Document the selection rationale and ensure appointment and contracting requirements are checked for the circumstances. Keep the accepted scope and management responsibilities accessible to the team. A proposal review can help identify missing questions and make offers comparable, allowing the company to select an appropriately authorised independent auditor without confusing ordinary advisory support with the separate role of issuing the audit report.