Audit planning isn’t just paperwork before the real work starts. It’s the single most important factor in whether an audit runs smoothly or turns into a drawn-out, expensive process that frustrates everyone involved. ISA 300 (Planning an Audit of Financial Statements) requires auditors to plan every engagement properly – and for good reason. A well-constructed audit plan shapes every decision the audit team makes from day one through to signing the audit report.

So what does good audit planning actually look like? And why should you, as a business owner or finance director, care about how your auditor plans their work?

What audit planning involves

At its core, planning an audit means establishing the high-level audit strategy and developing a detailed audit plan. These are two distinct things, though they work together.

The overall audit strategy sets the scope, timing, and direction of the engagement. It determines things like which locations to visit, how many people are needed, what deadlines apply, and where the biggest risks lie. Think of it as the high-level game plan.

The audit plan is more granular. It describes the specific audit procedures the audit team members will carry out, the nature and timing and extent of testing for each area, and how resources will be allocated. The audit strategy and audit plan work together. If the strategy is the map, the plan is the turn-by-turn directions.

Under ISA 300, both documents must be recorded in the audit work file. They’re not static either – the auditor updates them throughout the engagement as new information comes to light. An unexpected audit risk discovered during fieldwork might mean revisiting the plan and adding extra procedures in specific audit areas. The direction of the audit can shift as the planning process evolves.

What are the 5 steps of audit planning?

While every firm has its own methodology, audit planning generally follows five key steps:

1. Understand the entity and its environment – the auditor studies your business, your industry, the regulatory framework you operate in, and the economic conditions affecting you. For a UK company, that means considering Companies House filing requirements, FRC expectations, and any sector-specific regulations. This understanding feeds directly into the risk assessment.
2. Perform a risk assessment – ISA 315 requires auditors to identify and assess the risk of material misstatement in the financial statements, including evaluating internal control over financial reporting. Some risks are inherent to your industry (property valuations in real estate, stock obsolescence in retail). Others relate to your specific circumstances – a new ERP system, a major acquisition, or a change in revenue recognition policy.
3. Set materiality – this is the threshold above which errors or omissions could influence someone reading the accounts. The auditor sets this figure during planning, usually as a percentage of revenue, profit, or net assets. It drives how much testing is needed. A higher threshold means less detailed work; a lower one means more.
4. Develop the overall audit strategy – based on the risk assessment, the auditor decides the broad approach. Which areas need substantive testing? Can the team rely on controls in certain areas? What’s the timeline? When will interim work happen versus year-end procedures?
5. Create the detailed audit plan – this translates the strategy into specific audit procedures for each balance and disclosure. It assigns people to tasks, sets deadlines, and specifies what evidence needs to be gathered. The audit plan is the working document the team follows throughout the engagement.

These steps aren’t purely sequential. The auditor might revisit thresholds after the risk assessment reveals unexpected complexity, or adjust the approach once they’ve spoken with management about operational changes.

Why planning matters for your business

You might think audit planning is purely the auditor’s concern. But how well your auditor plans directly affects your experience of the audit.

It reduces disruption. A properly planned audit means fewer surprise requests. The team arrives knowing what they need, when they need it, and who to ask. Your finance staff can prepare schedules and supporting documents in advance rather than scrambling to respond to ad-hoc queries.

It catches problems early. Risk assessment during the planning phase often surfaces issues before they become serious. Maybe a new accounting standard applies this year that you haven’t fully implemented. Or perhaps a control weakness in your purchase ledger needs attention before year-end. Early identification means early resolution.

It keeps costs under control. Audits that go over budget almost always have one thing in common: poor planning. When the auditor hasn’t properly scoped the work, extra procedures get bolted on mid-audit. Staff get pulled in different directions. Deadlines slip. All of that translates to higher fees. A thorough audit plan prevents scope creep.

It produces better audit evidence. Planned procedures are more effective than reactive ones. When the auditor has thought carefully about which assertions matter for each balance, they design tests that actually answer the right questions. Random or unfocused testing wastes everyone’s time.

What are the 7 phases of the audit process?

Planning is phase one, but it helps to see where it fits in the wider audit process. Different frameworks describe this differently, but a common seven-phase model looks like this:

1. Engagement acceptance and continuance – the firm decides whether to take on or continue the audit engagement, considering independence, competence, and ethical requirements. ICAEW’s ethical code and ISA 220 guide this decision.
2. Planning and developing the approach – as described above, the auditor builds the strategy and detailed audit plan.
3. Risk assessment and control evaluation – the team assesses risks of material misstatement and evaluates the design and implementation of relevant controls.
4. Executing audit procedures – fieldwork begins. The team carries out the tests of controls and substantive procedures set out in the audit plan.
5. Evaluating findings – misstatements and control deficiencies identified during testing are evaluated individually and in aggregate. Are they material? Do they indicate systemic problems?
6. Forming the opinion – the auditor considers all evidence gathered and decides whether the financial statements are free from material misstatement. This is the core judgment call.
7. Reporting and communication – the audit report is issued. The auditor also communicates significant findings to those charged with governance, usually through a management letter with recommendations for improvement.

Planning influences every subsequent phase. A weak plan creates problems that compound as the audit progresses. A strong plan sets everyone up for a successful audit from the start.

Developing an audit plan: what auditors actually consider

When we develop an audit plan at Audit Group, we’re thinking about dozens of factors. Some of the most important include:

• Industry-specific risks – a construction company has different risk areas than a financial services firm. Revenue recognition on long-term contracts, for instance, requires different procedures than straightforward product sales.
• Previous audit findings – if the previous audit identified control weaknesses or significant adjustments, those audit areas get extra attention this time around. Each step in the audit process builds on what came before.
• Changes in the business – acquisitions, disposals, new systems, restructuring, changes in key personnel. Any of these can introduce new risks or change the nature of existing ones.
• Compliance requirements – some entities have additional compliance obligations beyond the standard Companies Act requirements. Charities have Charity Commission reporting. Regulated entities may need specific compliance testing.
• Group structure – if you’re part of a group, the audit plan needs to address component audits, intercompany transactions, and consolidation procedures. ISA 600 has specific requirements here.
• IT environment – the systems you use to process transactions and prepare accounts affect risk. Cloud accounting platforms, automated controls, and data analytics all shape the approach taken.

The best audit plans are tailored, not templated. A generic checklist approach misses the specific risks that matter for your organisation.

How you can help your auditor plan effectively

The planning phase works best as a two-way conversation. Here’s what you can do to help:

• Share information about significant changes early – don’t wait for the auditor to discover them during fieldwork
• Provide access to prior year working papers and management letter responses
• Be honest about areas where your controls are weaker or where the finance team has struggled
• Agree realistic timelines that account for your team’s availability and workload
• Ask questions about the audit plan – understanding what the auditor is doing and why builds trust on both sides

An effective audit is a partnership, not an adversarial process. When both sides invest in planning, the result is better for everyone.

Planning for a successful audit

Audit planning under ISA 300 isn’t a box-ticking exercise. It’s the foundation that determines whether the audit delivers genuine assurance or just ticks a statutory requirement. Good planning means the right risks get the right attention, the audit work runs efficiently, and the final audit report on the financial statement is well-supported by evidence.

At Audit Group, we’re part of Jack Ross Chartered Accountants, ICAEW-regulated and established in 1948. We’ve been planning and delivering audits in Manchester for over 75 years. Our team takes the time to understand your business properly before we start testing – because that’s how you get an audit that’s thorough without being disruptive.

If you’d like to discuss your next statutory audit or want to understand more about the audit process, call us on 0161 832 4451 or visit our contact page.