How to Prepare for an Audit: Your First Financial Statement Audit

Learning how to prepare for an audit comes down to four things: closing your books cleanly, assembling a complete set of supporting schedules, documenting your internal controls, and responding to your auditor’s requests on time. Companies that do those four things consistently experience shorter fieldwork windows, fewer surprise requests, and cleaner opinions. This guide walks through each step so your finance team knows exactly what to expect and when.

Why Knowing How to Prepare for an Audit Matters

A financial statement audit is an independent examination of your organization’s books conducted by a licensed CPA firm under AICPA Statements on Auditing Standards (AU-C) for non-public companies, or PCAOB standards for SEC registrants. The auditor issues an opinion on whether the financials are presented fairly, in all material respects, in conformity with US GAAP (or another applicable framework).

Your first audit typically takes longer than subsequent years because the firm has no prior-year workpapers to roll forward. Auditors must establish opening balances, understand your accounting policies from scratch, and map your control environment for the first time. The more organized your records are at the start, the less time fieldwork consumes, and the faster the engagement closes.

Audit readiness is not just an internal exercise. Lenders, investors, grant agencies, and acquirers routinely require audited financials. Going into the process underprepared delays your reporting, can trigger management letter findings, and in some cases results in a qualified or adverse opinion that creates real business consequences.

Step 1: Understand the Audit Timeline

The typical audit for a private company moves through four phases: planning, fieldwork, wrap-up, and issuance. For mid-market companies, the full cycle runs roughly three months from kickoff to signed report, though that number compresses or expands based on complexity and client responsiveness.

Planning (6 to 10 weeks before year-end)

During planning, the engagement team learns your business: your revenue streams, key estimates, related-party relationships, and the areas of the balance sheet most susceptible to misstatement. Auditors perform walkthroughs of significant processes and evaluate your internal controls. Under AU-C Section 300, planning is required to be performed early enough to allow the team to identify and respond to risk before fieldwork begins.

At the end of planning, the firm issues a PBC list, which stands for “prepared by client” or “provided by client.” This list details every document, schedule, reconciliation, and confirmation the audit team needs. PBC requests typically arrive four to six weeks before fieldwork starts. Treat the PBC list as the single most important document you will receive from your auditor.

Fieldwork (weeks 1-3 of the fieldwork window)

Fieldwork is the heaviest lift for both sides. Auditors test transactions, confirm balances with third parties, review agreements, and examine your disclosures. Your accounting team will field daily requests for clarifications or additional documents. A single open item, such as a missing lease agreement or an unexplained journal entry, can stall the entire engagement.

Wrap-up and issuance (2 to 4 weeks after fieldwork)

After testing wraps up, the firm reviews draft financial statements with footnotes, clears open review notes, and finalizes the opinion. Management representation letters are signed in this phase. The auditor issues the report and, if findings exist, a separate management letter describing control deficiencies.

Step 2: Close the Books Properly

A clean trial balance is the foundation of every efficient audit. Before your auditor arrives, your general ledger should reflect all activity for the period, with no significant open items or placeholder entries.

Close the books completely

Every balance sheet account should be tied to a supporting schedule. Cash balances must match bank reconciliations. Accounts receivable aging should reflect actual collectibility, with old balances either reserved or explained. Fixed assets should appear on a roll-forward that shows additions, disposals, and accumulated depreciation for the year. Inventory counts, if applicable, should be completed, documented, and reconciled to the ledger.

Prepare accruals and estimates

Auditors pay particular attention to year-end accruals and management estimates because these are the areas where judgment, and therefore risk of misstatement, is highest. Compile the basis for every significant accrual: vacation liability, bonus accrual, warranty reserve, revenue recognition cutoff, and any contingent liabilities. Document your methodology in writing so you can explain it concisely during fieldwork.

Draft complete financial statements with footnotes

Your draft financials should include all five required US GAAP statements: balance sheet, income statement, statement of comprehensive income (if applicable), statement of changes in equity, and statement of cash flows. Every financial statement requires footnote disclosures. Common first-audit disclosures that companies underestimate include the summary of significant accounting policies, revenue recognition (ASC 606), lease accounting (ASC 842), and any related-party transactions. Have these drafted before fieldwork begins, not after.

Step 3: Build Your PBC List Response

The prepared by client list is your audit’s operational playbook. Treat it with the same discipline you would a lender’s due diligence request.

Assign ownership and deadlines

Every item on the PBC list should have a named owner on your team and an internal delivery deadline that sits one to two weeks before the auditor’s stated need date. Buffer time allows you to catch issues before they become the auditor’s problem. Never let PBC requests pile up and then batch-respond at the last minute.

Organize documents clearly

Label files so the auditor can locate them without asking questions. A file named “AR Aging 12-31-25” is immediately usable. A file named “Report Export Final v3” creates friction and slows the engagement. Use a shared portal or cloud folder that both sides can access in real time.

Common PBC items for a first audit

The following documents appear on virtually every financial statement audit PBC list:

• Signed, final trial balance as of year-end
• Bank statements and bank reconciliations for all accounts
• Accounts receivable aging and any allowance calculation
• Fixed asset roll-forward with supporting invoices for material additions
• Debt agreements, loan statements, and amortization schedules
• Equity capitalization table and any shareholder agreements
• Significant revenue contracts (especially for variable or milestone-based arrangements)
• Lease agreements for any real property or equipment
• Corporate organizational documents (articles of incorporation, operating agreement)
• Board minutes and any significant resolutions
• Prior-year financial statements or tax returns (for opening balance verification)
• Insurance policies with coverage detail

For nonprofit organizations, additional items typically include grant award letters, contribution pledge documentation, and functional expense allocation methodologies. See our Nonprofit Audit & Assurance page for more on what nonprofits should expect.

Step 4: Document Your Internal Controls

Even in a financial statement-only audit (as opposed to an integrated audit), auditors are required to obtain an understanding of your internal controls. They use that understanding to assess risk and design their testing. You do not need a formal controls framework like COSO to pass a first audit, but you do need to be able to describe how your key processes work.

Key areas auditors will ask about

• How does your company approve vendor invoices and cut checks?
• Who can access the accounting system, and are access rights reviewed periodically?
• How are journal entries reviewed and approved?
• What is the process for monthly bank reconciliations, and who reviews them?
• How does management detect and respond to errors or irregularities?

If your company has segregation-of-duties weaknesses, which is common in smaller organizations where one person handles most accounting functions, document them proactively and be prepared to discuss any compensating controls. Auditors are not expecting perfection in a first-time audit engagement. They are looking for transparency and a finance team that understands its own processes.

Step 5: Communicate Proactively Throughout the Engagement

Audit delays almost always trace back to communication gaps, not complexity. Respond to auditor requests within the agreed timeframe. If a document is unavailable or taking longer than expected, say so immediately rather than letting the item sit open.

Designate a single point of contact on your team who coordinates all PBC responses and manages the auditor relationship day-to-day. For most mid-market companies, that role falls to the controller or assistant controller. The CFO should stay engaged at the planning and wrap-up stages and be available for key discussions about estimates, judgments, and any control findings.

AI-native audit platforms are reducing the back-and-forth that used to characterize fieldwork. Source-linked workpapers and real-time request tracking mean fewer follow-up calls and faster resolution of open items when both sides are working efficiently. That said, the quality of your preparation still determines the pace of the engagement more than any tool the auditor uses.

Step 6: Know What Comes After Fieldwork

Once fieldwork closes, your team’s primary deliverable is the final version of the financial statements with footnotes. The auditor will issue a draft report and ask management to review it carefully. This is not the time to make substantive accounting changes; those should be resolved during fieldwork. Review the draft opinion language, the footnote disclosures, and any management letter for accuracy.

If the auditor identifies a material weakness or significant deficiency in internal controls, it will appear in the management letter. These findings are not public disclosures for private companies, but lenders and investors may ask to see them. Understand each finding, agree on a remediation plan, and track it to closure before the next audit cycle.

For organizations subject to the Uniform Guidance Single Audit (federal expenditures of $1,000,000 or more in a fiscal year for years beginning on or after October 1, 2024), the wrap-up phase includes additional reporting requirements on federal programs. Plan for a longer timeline if a Single Audit applies to your organization.

Learn more about what goes into a full Audit & Assurance engagement and how Modus structures the process for mid-market clients.

Related reading: How Much Does an Audit Cost? Financial Statement Audit Pricing Explained

Frequently Asked Questions

How long does a first financial statement audit take?

Most first-year audits for private mid-market companies run three to four months from engagement kick-off to report issuance. The planning phase typically starts six to ten weeks before year-end. Fieldwork runs two to four weeks, followed by wrap-up and issuance. First-year engagements take longer than repeat audits because auditors must establish opening balances and build their understanding of your control environment from the ground up.

What is a PBC list in an audit?

PBC stands for “prepared by client” or “provided by client.” The PBC list is a document your auditor sends listing every schedule, reconciliation, agreement, and record the audit team needs to complete their work. It typically arrives four to six weeks before fieldwork begins. Responding to PBC requests accurately and on time is the single most important thing your team can do to keep the audit on schedule.

What financial statements do I need for an audit?

A US GAAP audit requires a complete set of financial statements: balance sheet, income statement, statement of changes in equity, statement of cash flows, and, where applicable, a statement of comprehensive income. All statements must include footnote disclosures. Auditors will also require a signed trial balance that ties to the financials, along with supporting schedules for every significant balance sheet account.

How should I prepare my internal controls documentation for a first audit?

You do not need a formal controls framework for a first financial statement audit, but you do need to be able to describe how key processes work: invoice approval, check signing, journal entry review, bank reconciliation, and system access. If you have segregation-of-duties gaps, document any compensating controls. Transparency about your control environment helps auditors scope their testing efficiently and reduces the number of questions during fieldwork.

What is the difference between a material weakness and a significant deficiency?

Both are control deficiencies identified during an audit. A significant deficiency is a deficiency, or combination of deficiencies, in internal control that is less severe than a material weakness but important enough to merit attention by those charged with governance. A material weakness is a deficiency, or combination of deficiencies, where there is a reasonable possibility that a material misstatement of the financial statements would not be prevented or detected on a timely basis. Material weaknesses carry greater implications for financial reporting credibility and should be remediated before the next audit cycle.

What happens if my books are not ready when the auditor starts fieldwork?

If your books are not closed and supporting schedules are not ready at the start of fieldwork, the engagement will be delayed. Most firms will pause fieldwork and reschedule, which can push your report delivery date by weeks and, depending on your reporting obligations, trigger covenant violations or missed lender deadlines. The cleaner your books are before the auditor arrives, the shorter and less expensive the engagement will be.