What to Look for When Comparing Audit Proposals

Most business owners receive their first audit proposal, read it briefly, and either accept it or ask one question – usually about the fee. The second proposal arrives, they compare the two numbers, and pick the lower one.

This is how many businesses end up with the wrong auditor.

An audit proposal is not a quote for a commodity service where the cheapest option is functionally the same as the most expensive.

The difference between a well-matched auditor and a poorly-matched one shows up in the length of the engagement, the quality of the management letter, the disruption to your finance team during fieldwork, and occasionally in situations you never anticipated – a qualified opinion, a missed filing deadline, or an auditor who simply doesn’t understand your business well enough to ask the right questions.

This guide sets out what audit proposals actually contain, what the numbers mean, what the numbers hide, and the specific things to look for that most businesses miss entirely.

TL;DR – Key Takeaways

What a Statutory Audit Proposal Should Always Include

Before comparing proposals, you need to know what a complete one looks like. A professional audit firm submitting a proposal for a UK statutory audit engagement should include the following:

1. Scope of the engagement. A clear statement of what the audit covers – the entity or entities being audited, the financial year, the accounting framework (UK GAAP or IFRS), and any components explicitly excluded from scope. If a proposal does not define scope clearly, any work outside the implied scope becomes a fee negotiation after the fact.

2. The audit approach. How the firm intends to conduct the audit – risk assessment methodology, reliance on internal controls versus substantive testing, use of sampling, and any areas of particular focus given your business model or sector. A proposal that says nothing beyond “we will conduct a statutory audit in accordance with ISAs (UK)” tells you nothing about how the firm thinks about your specific business.

3. The engagement team. Who will actually do the work? The partner responsible for signing the audit report, the manager who will run fieldwork, and the approximate seniority of the supporting team. This is the most frequently omitted section in proposals from smaller firms and the most frequently ignored section by businesses receiving them.

4. Timeline and key milestones. Proposed start date for planning, fieldwork dates, and expected date of the signed audit report. For businesses with Companies House filing deadlines, this section is not optional – it is the mechanism by which you hold the auditor accountable to a schedule.

5. Fee basis and what causes fees to increase. The quoted fee, the basis on which it was calculated (usually hours multiplied by rates by grade of staff), and a specific list of circumstances that would result in additional charges. Proposals that quote a fee without explaining what is included and what is not are inviting a fee dispute.

6. Independence confirmation. A statement that the firm has considered its independence obligations and identified no conflicts of interest. For UK statutory audits, independence is a legal requirement – a proposal that does not address it at all should prompt a question.

7. Terms of engagement and liability cap. The professional terms under which the engagement will be conducted, including any limitation of liability. Most firms include standard terms – it is worth reading them once, particularly the sections on liability, dispute resolution, and termination.

If a proposal you have received is missing several of these elements, that is itself a data point about the firm’s approach to client communication.

Understanding the Fee – What the Number Actually Means

The quoted fee is the most visible number in a proposal and the most frequently misunderstood.

Audit fees are calculated using a simple formula: hours × hourly rate × staff grade. 

A firm quoting £4,500 + VAT for your statutory audit is telling you they expect the work to take a certain number of hours at their standard charge-out rates. They may be right. They may also be underestimating, planning to use more junior staff than you expect, or deliberately quoting low to win the work with the intention of recovering margin through additional charges.

Here is what actually drives audit fees – and why two firms can quote very different numbers for the same engagement:

1. Hourly rates by grade. A Big Four firm’s senior manager may charge £400 per hour. A regional mid-tier firm’s senior manager may charge £180 per hour. The work is not necessarily better at £400 – the rates reflect the firm’s cost base, their market positioning, and the complexity of the clients they typically serve. For a straightforward SME statutory audit, paying Big Four rates rarely produces proportionally better output.

2. Estimated hours. This is where proposals differ most. Two firms assessing the same engagement may estimate very different hours based on their experience with similar businesses, their planned approach, and – critically – how much they want the work. 

A firm that wants a new client relationship badly enough may quote an optimistically low number of hours that does not survive contact with your actual records.

3. Staff mix. A proposal that commits to a partner-led engagement with experienced senior staff will cost more than one where a partner signs the report but a first-year trainee does most of the fieldwork. For smaller businesses, the difference in what you actually receive can be significant.

In practical terms, when comparing fees, do not compare the totals. Compare what the totals include. Ask each firm to break down their quote by staff grade and number of hours. This takes one email and makes the comparison meaningful rather than superficial.

The Questions That Reveal More Than the Proposal Itself

A well-written proposal tells you what a firm wants you to know. The right questions tell you what you actually need to know.

1. “Can you show me an example anonymised management letter from a similar engagement?”

The management letter – formally the “report to those charged with governance” under ISA (UK) 260 – is issued after the audit and highlights control weaknesses, process improvements, and other matters the auditor identified during fieldwork. It is arguably the most practical output of the audit for a growing business.

Some firms produce detailed, actionable management letters with specific recommendations. Others produce boilerplate documents that say almost nothing. Asking to see an example is entirely reasonable, and the quality of the response will tell you a great deal. 

A firm that has never been asked this before, or that struggles to produce an example, is probably producing the boilerplate version.

2. “What were the biggest issues you identified in the last three audits you conducted for businesses similar to ours?”

This question cannot be answered with a prepared response. It requires the auditor to draw on actual experience and think on their feet. The answer will tell you whether they have genuine familiarity with your sector, whether they are candid about what they find in practice, and whether they think in terms of the client’s interests or purely in terms of completing the audit opinion.

An auditor who says something like “the most common issue we see in construction businesses is revenue recognition timing around long-term contracts – we spend a lot of time on that” is showing sector knowledge. An auditor who responds with a generic statement about the importance of strong internal controls is not.

3. “What happens if there is a dispute about the fee?”

This is a question most businesses never ask and should always ask. The answer reveals how the firm handles disagreements and whether they have a clear process. A firm that responds defensively or dismissively to this question in a proposal meeting is showing you how they will respond when the actual dispute happens.

4. “Who specifically will be the day-to-day contact during fieldwork – and how do we reach them?”

At larger firms, the partner presenting the proposal may have very limited involvement in the actual audit. The day-to-day contact during fieldwork is often a manager or senior who was not in the room when you met the partner. Knowing who this person is before you sign, and having a direct line to them, changes the dynamic of the relationship significantly.

5. “Can you walk me through what happens if my records aren’t ready on time?”

This question tests whether the firm has thought about contingencies and whether they’ll be flexible or rigid when things don’t go to plan. A firm that has a clear answer – “we’d reschedule fieldwork, but we’d need at least two weeks’ notice to avoid a fee impact” – is being realistic. A firm that gives a vague answer or looks uncomfortable hasn’t thought it through.

Comparing Proposals Side by Side – A Practical Framework

When you have two or three proposals in front of you, structure your comparison around these five dimensions rather than going straight to the fee column:

1. Sector experience – specific, not general

Does the proposal reference your industry specifically? Does it mention relevant reporting standards, regulatory requirements, or common audit issues in your sector? “Experience with SMEs” is general. “We audited six property investment companies in 2025, including two with complex lease portfolios under IFRS 16” is specific.

2. Team seniority and continuity

What grade of staff is planned for fieldwork? Is there a named manager? Does the firm have a stated policy on team continuity between years – because an auditor who has to relearn your business every year is a more expensive and less effective auditor than one who builds genuine knowledge over time.

3. Timeline realism

Does the proposed timeline work for your year-end and filing deadline? Is there buffer built in? Have they asked about your own finance team’s availability – or have they proposed dates without reference to your constraints? A firm that does not ask about your calendar before proposing fieldwork dates is not thinking about your business.

4. What happens when things go wrong

Does the proposal address what happens if your records are not ready on time, if unexpected issues arise during fieldwork, or if the signed report is delayed? The absence of any contingency thinking is not a good sign.

5. Communication and responsiveness during the proposal process itself

How long did it take each firm to send their proposal after your initial enquiry? Was it complete and professional? Did they ask intelligent questions about your business before submitting it, or did they send a template with your name on it? The proposal process is a preview of the engagement. A firm that is slow, generic, or uncommunicative before they have won the work will not improve after they have.

Case Study: How the right questions changed the Decision

Background: A Manchester-based technology services company with £12 million turnover received three audit proposals in early 2025. The finance director was new to the audit process – the company had only recently exceeded the audit exemption thresholds – and initially planned to choose based on fee alone.

Proposal A: National mid-tier firm, £7,200. Professional proposal, named partner, but no named manager. When asked for a management letter example, they sent a three-page document that was almost entirely generic boilerplate (“we recommend you maintain adequate internal controls”). When asked about their tech sector experience, the partner mentioned “several software companies” but couldn’t name specific audit risks common to SaaS revenue models.

Proposal B: Regional firm with five partners, £5,800. Two-page proposal. No engagement team named. When asked to break down the fee by hours and grade, they said “we quote on a fixed-fee basis” and couldn’t provide a breakdown. 

When asked what happens if records aren’t ready on time, the partner said “we’d have to charge extra” but couldn’t specify how much or under what circumstances.

Proposal C: Regional firm specialising in tech and digital businesses, £6,500. Detailed proposal that specifically mentioned revenue recognition for subscription models, deferred revenue timing, and R&D tax credit interaction with capitalised development costs – all issues relevant to the company’s business model. Named both partner and manager. Provided a six-page management letter example with specific, actionable recommendations. The fee breakdown showed 50 hours at defined rates by staff grade. When asked about fee disputes, they had a clear, documented escalation process.

The decision: The FD chose Proposal C. Not the cheapest. Not the biggest firm. But the only one that demonstrated actual understanding of the business and could answer the hard questions clearly.

The outcome: The audit was completed on schedule. The management letter identified a revenue recognition inconsistency that had been creating timing differences in quarterly management accounts – the company had been recognising annual contracts upfront rather than spreading them over 12 months. 

The auditor helped them correct the policy and implement a simple tracking spreadsheet. The FD later said: “The fee difference between the cheapest and the one we chose was £700. The value of fixing that revenue recognition issue alone was worth ten times that.”

Key lesson: The questions revealed what the proposals concealed. Proposal B’s “fixed fee” was a red flag – it meant they couldn’t estimate the work accurately and would likely come back mid-audit with a revised figure. Proposal A’s generic management letter example showed they didn’t produce useful output beyond the statutory opinion. Proposal C earned the work by demonstrating competence before the engagement even started.

A real example of what this looks like in Practice

A manufacturing business in the West Midlands with £8 million in turnover and two subsidiaries received three audit proposals through Experlu in 2025.

Proposal A came from a regional firm with eight partners. Fee quoted: £6,200. The proposal was detailed – it named the engagement manager, referenced the company’s accounting framework specifically, identified inventory valuation as a key audit risk given the manufacturing operation, and proposed fieldwork dates that aligned with the company’s year-end timetable. The management letter example they provided was four pages and contained eight specific recommendations from a comparable engagement.

Proposal B came from a smaller two-partner firm. Fee quoted: £4,800. The proposal was two pages. It confirmed they would conduct a statutory audit in accordance with ISAs (UK) and quoted a fee. It did not name a specific manager, did not reference the group structure, and did not mention inventory once.

Proposal C came from a mid-tier national firm with an office in Birmingham. Fee quoted: £9,500. The proposal was comprehensive and professional, but it was clearly a template – the sections on industry-specific risks described the manufacturing sector generically, and when pressed, the partner admitted the team had limited direct manufacturing experience.

The business chose Proposal A. The fee was not the lowest – it was £1,400 more than Proposal B. The audit completed on time, the management letter identified a stock valuation methodology inconsistency that had been creating a small overstatement in the accounts for two years, and the engagement manager was responsive throughout.

Proposal B’s firm, when asked the follow-up questions described earlier in this article, could not produce a management letter example and became evasive when asked about fee escalation. Proposal C was eliminated on sector experience grounds.

This is how the comparison should work in practice.

The Role of Price – Where it belongs in the Decision

Price should be the last factor you assess, not the first.

That is not to say it does not matter. For a small business where the difference between two proposals is £3,000 and the higher-priced firm offers no discernible additional value, choosing the lower fee is rational. But in most cases, the fee difference between a well-matched auditor and a poorly-matched one is small relative to the cost of getting it wrong.

A poorly-matched auditor who takes longer than expected, produces a thin management letter, requires your finance team to spend twice as many hours supporting fieldwork, and delivers a signed report three weeks later than promised has not saved you money. They have cost you money in staff time, caused you anxiety about your filing deadline, and given you nothing useful in return for the engagement.

The right question is not “which proposal is cheapest?” It is “which firm gives me the most confidence that the audit will be completed on time, to a professional standard, with minimum disruption, by people who understand my business?”

Price fits into that question – but it is not the question itself.

How Experlu Makes This Process Simpler

The traditional way of finding an auditor – asking for recommendations, approaching firms individually, waiting for proposals – is time-consuming and produces an uneven comparison. Some firms respond quickly with detailed proposals. Others take two weeks to send a template. By the time you have three proposals in hand, you have already spent more time on the process than it deserves.

Experlu is a free matching platform that connects UK businesses with vetted, ICAEW and ACCA-registered auditors. You submit your requirements – your sector, size, accounting framework, timeline, and any specific requirements – and receive three tailored proposals from matched audit firms within 48 hours.

The matching process means the three proposals you receive are from firms with relevant sector experience and the appropriate capacity for your engagement. You are not comparing a Big Four practice with a sole practitioner and a regional mid-tier firm on the same spreadsheet – you are comparing three firms that have already been screened against your specific requirements.

All three proposals arrive through a single platform. You can compare them directly, ask follow-up questions through the platform, and make your decision without the administrative burden of managing multiple separate firm relationships. There is no cost to your business and no obligation to proceed with any of the proposals you receive.

For businesses going through the audit process for the first time, this structure is particularly valuable – it removes the uncertainty of not knowing whether the proposals you have received represent the market, and it ensures the firms you are comparing have been independently vetted before being put forward.

Before You Sign – The Final Checklist

Before accepting any audit proposal, confirm the following:

✓ The engagement letter matches the proposal. Firms sometimes issue an engagement letter that differs in scope or fee from the original proposal. Read both documents side by side before signing.

✓ The proposed timeline gives you enough buffer. Companies House filing deadlines for private companies are nine months after year-end. If the signed report is expected three weeks before that deadline and anything goes wrong, you have very little room. The tighter the timeline, the more important it is to discuss contingency explicitly.

✓ You know who to call if something goes wrong. Not just the partner’s email address – a direct line to the manager who will be running fieldwork. Test this before fieldwork starts.

✓ Outstanding fees from the previous auditor are resolved. If you are switching auditors, any dispute over the outgoing firm’s final invoice should be resolved before the incoming firm starts work. An unresolved fee dispute with the previous auditor creates friction in the handover process that can delay the current year audit.

✓ You have confirmed the firm’s Registered Auditor status. Before signing, verify the firm holds a current RA licence. You can check this on the ICAEW public register or the ACCA practising certificate register. An audit signed by an unlicensed firm is not legally valid – Companies House will reject it.

Frequently Asked Questions

What should I ask for if I’m comparing audit proposals? 

Ask each firm to provide: 

(1) a breakdown of their fee by staff grade and hours, 

(2) an anonymised example of a management letter from a similar engagement, 

(3) names of the partner and manager who will work on your audit, 

(4) their proposed timeline with key milestones, and 

(5) a clear explanation of what circumstances would cause the fee to increase.

How do I know if an auditor understands my industry? 

Ask them to describe the three biggest audit risks or challenges they typically see in businesses like yours. A firm with genuine sector experience will give specific, technical answers (e.g., “revenue recognition timing for long-term contracts” for construction, or “capitalised development costs vs R&D tax credits” for software). Generic answers like “internal controls” or “fraud risk” suggest they lack sector depth.

Should I always choose the cheapest audit proposal? 

No. The cheapest proposal is often under-priced – the firm either underestimated the work and will charge more later, or they’re planning to use very junior staff. A poorly-matched auditor costs more in staff time, delays, and poor advice than the fee you “saved.” Compare value, not just price.

What’s a management letter and why does it matter? 

The management letter (formally the “report to those charged with governance” under ISA 260) is issued after the audit and highlights control weaknesses, process improvements, and other findings. A good management letter with specific, actionable recommendations is often the most valuable output of an audit for a growing business. Ask to see an example before you sign.

What if the auditor’s fee increases mid-engagement? 

A legitimate fee increase happens when the auditor encounters significantly more work than originally scoped – for example, if your records are incomplete, or if they discover a complex transaction that wasn’t disclosed initially. 

An illegitimate increase happens when the firm deliberately underquoted to win the work. The best protection is a clear fee basis in the proposal that specifies exactly what circumstances will trigger additional charges.

Can I switch auditors if I’m unhappy with the one I chose? 

Yes. You can remove an auditor mid-year by shareholder resolution under section 510 of the Companies Act 2006, or you can simply not reappoint them at year-end.

How long should it take to receive an audit proposal? 

A professional firm should be able to turn around a proposal within 3-5 working days of receiving your requirements. Firms that take two weeks or more are either disorganised or not prioritising your enquiry – both are red flags. Through Experlu, you receive three matched proposals within 48 hours.

Do I need to meet the auditors before deciding? 

Not essential, but highly valuable for larger or more complex engagements. A 30-minute video call lets you ask the questions from this guide, assess their communication style, and confirm they actually understand your business. For straightforward SME audits, a well-written proposal and good email responses to your questions are usually sufficient.

Summary

Comparing audit proposals well requires looking beyond the fee to the substance of what each firm is actually offering. Scope clarity, team seniority, sector experience, timeline realism, and the quality of communication during the proposal process itself are all better predictors of a successful audit than the quoted number alone.

The questions that reveal most about a firm are the ones about their management letter quality, their experience with businesses like yours, and what happens when things don’t go to plan. Most businesses never ask these questions. The ones that do tend to end up with better auditor relationships and better audit outcomes.

If you are at the stage of comparing proposals and want to ensure you are comparing firms that have been independently vetted and matched to your specific requirements, Experlu can connect you with three qualified audit firms within 48 hours – free, with no obligation to proceed.

This article has been reviewed by Rajesh M., ACA (ICAEW), Audit Support Specialist, ex KPMG & Deloitte, with 20+ years of experience in UK statutory audit, advisory and financial reporting. Last updated May 2026.

Related guides:

• How to Switch Auditors Mid-Year in the UK
• UK Audit Exemption Thresholds 2025/26: Does Your Company Still Need an Audit?
• What Does a Statutory Audit Actually Cover?