How to Prepare for an Audit

1. What an Audit Actually Examines

An audit tests whether reported figures are supported by evidence. Not whether the business is well run, not whether decisions were sensible, simply whether the numbers can be traced to source documents.

That distinction matters because it tells you what to prepare. The question is never whether an expense was wise. It is whether you can show what it was, when it happened, and why it was a business cost.

2. Why Preparation Cannot Start When the Letter Arrives

Reconstruction after the fact is visible. Receipts recreated from memory, mileage logs produced retrospectively and reconciliations completed in a weekend all have characteristics an examiner recognises.

The second problem is time. Response windows are measured in weeks, and rebuilding a year of records while running a business is not realistic for most owners.

Audit ready bookkeeping means the evidence already exists. AICPA professional standards assume underlying records are contemporaneous, and records assembled under deadline rarely meet that test.

• Reconstructed records carry less weight than contemporaneous ones
• Response windows are short and do not extend for inconvenience
• Unreconciled periods are the first thing an examiner looks for, which is what is account reconciliation protecting you against
• Missing substantiation usually results in disallowance rather than debate

3. How Ready Businesses Stay Ready

Readiness is a by-product of routine rather than a separate activity. Businesses that reconcile weekly, attach evidence at the point of entry and close monthly are audit ready without doing anything specifically for audit.

What is account reconciliation doing in this context is creating the paper trail. A reconciled account with a saved report and attached statement is the evidence an examiner expects to see.

• Reconcile weekly and save the reconciliation report each time
• Attach evidence to transactions as they are coded, not later
• Close monthly and lock the period so corrections are deliberate
• Document unusual items with a note explaining treatment
• Review annually against a checklist rather than waiting for a prompt

4. 9 Steps to Be Audit Ready

Work through these once, then maintain them. The first pass takes a week, after which it is routine.

Step 1: Reconcile Every Account Through to Current

Start here because everything else depends on it. Any period with an unexplained variance is a period an examiner will focus on, and gaps compound backwards.

Step 2: Attach Supporting Evidence to Transactions

Receipts, invoices and contracts stored against the transaction they relate to. Evidence in a separate folder is evidence that takes hours to match when someone asks for a specific item.

Step 3: Separate Personal and Business Completely

Mixed spending is the most common finding and the hardest to defend. If it has happened historically, document the separation and correct it going forward rather than hoping it is not noticed.

Step 4: Review Worker Classifications

Contractor versus employee is a high-risk area with substantial penalties. Review each 1099 relationship against the control tests and document why the classification is correct.

Step 5: Document Owner Transactions

Draws, loans and personal expenses paid by the business need recording with clear treatment. Undocumented owner activity is treated as unreported income until proven otherwise.

Step 6: Confirm Consistent Treatment Across Periods

Gaap compliant bookkeeping requires the same transaction type to be handled the same way each period, and gaap compliant bookkeeping is what an examiner assumes when testing consistency. Inconsistency suggests either error or manipulation, and an examiner cannot tell which from the outside.

Step 7: Produce a Contemporaneous Inventory Count

If the business holds stock, a dated physical count with working papers is required. A valuation calculated backwards from sales is not a count and will not be accepted as one.

Step 8: Build the Document Index

A simple list of where everything lives, bank statements, contracts, payroll filings, prior returns. This is what turns a three-week scramble into a two-day retrieval exercise.

Step 9: Run an Annual Internal Review

Work through the checklist yourself before anyone else does. Knowing how to prepare for an audit means finding your own weaknesses first, while there is still time to address them.

An external accountant reviewing the file once a year is inexpensive compared with the cost of a finding nobody anticipated.