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How to Choose an Auditor

You’ve been tasked with finding a new external auditor for your organization.   You have identified several auditors that have been recommended by other organizations similar to yours, and you are now wondering how to go about making your final selection.

This article suggests a number of criteria that may be considered when choosing an auditor for your organization.  I have grouped these under three broad headings: Capability, Strategy and Cost.


Size of audit firm:  Larger audit firms are often able to offer greater depth of experience and a larger pool of resources to draw upon, but that may come at a higher price than a smaller firm.

Related experience:  you will likely want to know that the audit firm has experience working with clients in your sector. For example, if you are a not-for-profit organization then you may want to ensure that the assigned audit team has conducted audits of NPO clients that are similar to you.

Staff continuity:  A significant amount of time can be spent initially training auditors on your specific processes and procedures. As far as practically possible, the audit firm should strive to keep the same staff assigned to your account in subsequent years, to avoid the time and cost that this retraining imposes on you and your staff.

Quality control program:  Many audit firms have developed their own comprehensive quality assurance processes, that include training programs for audit staff, and documented systems and processes which they use to conduct their audits. One question you may wish to ask is whether there are multiple levels of review of the audit work.


Audit strategies and methodologies:  There are a number of different approaches to conducting an audit, and it is helpful to understand the differences between each when evaluating audit proposals. These may include for example substantive or risk-based approaches, and value-added approaches focussed on identifying improvement opportunities.

Time to completion:  If you must have the audit completed within a certain period of time following year-end, or if the final report needs to be ready by a specific date each year, then the audit firm must be able to accommodate these requests in its work plan.

Team mix:  In audit firms large enough to have audit partners, senior auditors, and junior staff, it is important to know approximately how many hours will be spent on the audit engagement by each level of person. If there is little involvement of the partner, then the experience and expertise of the other staff becomes of greater interest and importance.


Audit term and fees:   Audit firms are often engaged for a multi-year period, with annual audit fees set at a fixed amount, or to be increased by a specified amount (for example the rate of inflation) over that period.  The quoted audit fees will usually depend on you providing the auditor with required audit documentation, supporting working papers and the preparation of year-end financial statements. It would also assume that there would not be numerous audit adjustments, and that there would be no significant change in the size and scope of your operations.

Value-added activities:   For NPO’s and charities, the preparation and filing of any required annual CRA returns may also be included in the price of the audit.

Once you have developed a short list of potential audit firms, rather than request a formal RFP response from each, we have found that a better approach is to meet with each of the firms being considered.   You can ask them to address the items we’ve covered above, and explain why they might be best suited to become your auditor.

By keeping these criteria in mind, you should be able to successfully find the auditor that best meets your needs.

If you would like assistance in choosing an auditor for your organization, or would like help reducing business risk and strengthening your organization, please contact me at 613-727-1230 ext 212 or

Holding Certified Management Accountant (FCMA), Chartered Professional Accountant (FCPA) and Certified Management Consultant (CMC) designations, Richard is also a graduate of the British Columbia Institute of Technology, holding a diploma in Computer Programming and Systems Technology. Outside of work, Richard enjoys spending time with his wife and three children, and training for obstacle races.

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