When you're ready to hire an auditor, asking the right questions upfront saves time, prevents miscommunication, and helps you avoid overpriced or under-qualified firms. Most businesses get multiple audit quotes before deciding, but many don't know what to ask beyond "how much?" to actually compare apples to apples. This guide walks you through the essential questions that separate a thorough proposal from a surface-level pitch.
Clarify the Scope and Type of Audit
Start by confirming exactly what type of audit you need. Financial statement audits, internal audits, compliance audits, and SOC 2 audits all differ significantly in depth and cost. Ask your potential auditor to specify which standards or frameworks they'll follow—GAAS (Generally Accepted Auditing Standards), AICPA guidelines, or industry-specific requirements.
Request a written description of what's included: Will they review all account categories, or focus on high-risk areas? Do they test internal controls, or just verify balances? A firm quoting $3,000 might be doing a limited scope review, while another at $8,000 is conducting a full financial statement audit. Getting this in writing prevents surprises mid-project.
Ask About Timeline and Resource Allocation
Audits aren't one-size-fits-all on timing. Small companies with straightforward finances might wrap up in 2–4 weeks; larger organizations with complex transactions can take 8–12 weeks or longer. Ask the auditor:
- How many on-site visits do they plan, and how long is each?
- Will the same team member lead your audit from start to finish, or will you work with multiple staff?
- What's their typical turnaround from fieldwork completion to final report delivery?
A firm assigning a junior associate with minimal oversight differs from one pairing you with a senior manager who stays involved. This impacts quality and your ability to ask informed questions mid-audit.
Understand Fee Structure and Billing
Audit costs vary widely based on company size, transaction volume, and complexity. Expect to pay $2,500–$6,000 for a basic audit of a small business, $10,000–$25,000 for a mid-sized company, and $50,000+ for larger organizations. Always ask:
- Is the quote fixed, or do they bill hourly with a range?
- What's included in the quoted price—fieldwork, reporting, and revisions?
- Are there extra charges if they discover significant issues or unusual transactions?
- Do they charge for preliminary meetings or tax planning consultations?
Request itemization by service (e.g., planning phase, field testing, reporting) so you see where the money goes and can compare across vendors meaningfully.
Verify Experience and Industry Knowledge
An auditor familiar with your industry spots red flags faster and asks smarter questions. A firm experienced auditing nonprofits, for example, knows the specific compliance traps that trip up that sector. Ask:
- How many audits have they completed in your industry in the past three years?
- Do they have staff with relevant certifications (CPA, CIA, or CFE)?
- Have they worked with clients your size before?
- Do they stay current on regulatory changes affecting your field?
If you're in healthcare, construction, or financial services, industry expertise genuinely matters—it reduces friction and improves insights.
Ask About Quality Control and Independence
Independence is non-negotiable in auditing. Confirm the firm isn't providing bookkeeping, payroll, or tax preparation services that could compromise their ability to audit objectively. Ask who reviews their audit work before issuing the final report and what their quality control process looks like.
Also inquire about peer reviews or regulatory oversight. Are they registered with the PCAOB if they audit public companies? Do they undergo external quality reviews? These credentials signal rigor.
Get References and Check Their Track Record
Never skip this step. Ask for at least two references from clients in a similar size or industry. Call them and ask: Did the audit stay on budget and timeline? Were there surprises? Did the auditor provide useful insights beyond compliance checking?
If a firm can't or won't provide references, move on.
Frequently Asked Questions
Q: How long should I expect the audit process to take from kickoff to final report? Most audits span 6–16 weeks total, depending on size and complexity; however, the actual on-site work typically takes 1–4 weeks concentrated over one or two visits.
Q: Can I use the same firm for both audit and tax preparation? Yes, but confirm they have internal controls separating the audit team from the tax team to maintain independence—some larger firms manage this effectively, while smaller practices may lack the structure.
Q: What should I do if an audit quote seems unusually low? Request a detailed scope breakdown and check their proposed team's experience level; suspiciously low bids often signal limited fieldwork, less-experienced staff, or undisclosed constraints that emerge later.
Compare audit providers side-by-side on Mercoly to find firms that match your needs, timeline, and budget.